VC 5001 Installation, operation and maintenance

®
model VC Grinding mill clutches 203676

AN429468380025en-000101
2 VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1
 Airflex model VC Grinding mill clutches

Contents
1.0 INTRODUCTION ...................................................................... 6
1.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 How It works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Clutch adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.0 INSTALLATION ....................................................................... 8

2.1 Mounting arrangements ................................................................... 8
2.2 Mounting considerations .................................................................. 8
2.3 Mounting spider and drum hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.4 Shaft alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.5 Axial locking device adjustment ............................................................. 11
2.6 Installation of element and drum (narrow, dual narrow and single wide) ............................. 12
2.7 Installation of element and drums (dual wide) ................................................. 12
2.8 Air control system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.9 Electrical controls ....................................................................... 14

3.0 OPERATION ........................................................................ 17

3.1 Torque, RPM and pressure limits ........................................................... 17
3.2 Control component adjustment ............................................................ 17

4.0 MAINTENANCE ..................................................................... 18

4.1 Periodic inspection ...................................................................... 18
4.2 Removal of element assembly and drum (narrow, dual narrow and single wide) ...................... 20
4.3 Removal of element assemblies and drums (dual wide) ......................................... 20
4.4 Removal of spider and drum hub ........................................................... 20
4.5 Disassembly of the element ............................................................... 20
4.6 Friction lining replacement ................................................................ 21
4.7 Assembly of the element ................................................................. 22

5.0 SPARE PARTS STORAGE ............................................................. 22

5.1 Element assemblies ..................................................................... 22
5.2 Drums . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.3 Air actuating tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... 22

6.0 ORDERING INFORMATION/ TECHNICAL ASSISTANCE ..................................... 23

6.1 Equipment reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7.0 PARTS LISTS ........................................................................ 24

7. 1 Single narrow element assemblies .......................................................... 24
7. 2 Dual narrow element assemblies ........................................................... 24
7. 3 Single wide element assemblies ........................................................... 26
7. 4 Dual wide element assemblies ............................................................. 28
7. 5 Drums . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7. 6 Axial locking devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7. 7 Friction block and rivet kits ................................................................ 29
7. 8 Friction shoe assembly, torque bar and release spring kits ....................................... 29

8.0 REVISION .......................................................................... 30

9.0 NOTES ............................................................................ 31

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Airflex model VC Grinding mill clutches

WARNING
Forward this manual to the person responsible for
Installation, Operation and Maintenance of the product
described here in. Without access to this information,
faulty Installation, Operation or Maintenance may result
in personal injury or equipment damage.

CAUTION
Use only genuine Airflex replacements parts. The Airflex
®

Division of Danfoss recommends the use of

genuine Airflex replacement parts. The use of non-genuine
Airflex replacement parts could result in substandard
product performance, and may void your Danfoss warranty.
For optimum performance, contact Airflex:
In the U.S.A. and Canada:(800) 233-5926 Outside the
U.S.A. & Canada: (216) 281-2211

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 Airflex model VC Grinding mill clutches

Item Descriptions

1 Rim
2 Tube (w/valve stem snap rings where req’d.)
3 Elbow assembly
4 Compression ring (included with item 3)
5 Air connection tube
6 Air connection gasket
7 Friction shoe assembly
8 Air tube group (dual mounted)
9 Spacer group (dual mounted)
10 Replacement friction lining & fasteners
11 Slide plate (2 required)
12 Torque bar
13 Release spring

Dual mounted

Figure 1. Component parts for Airflex type VC element

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Airflex model VC Grinding mill clutches

1.0 Introduction 1.2 How it works

Throughout this manual there are a number 1.2.1 Referring to Figures 1 and 2, the neoprene
of HAZARD WARNINGS that must be read and and cord actuating tube is contained within a
adhered to in order to prevent possible personal steel rim which is drilled for mounting to the
injury and/or damage to equipment. Three signal driving component. As air pressure is applied
words “DANGER”, “WARNING” and “CAUTION” are to the air actuating tube, the tube inflates,
used to indicate the severity of a hazard, and are forcing the friction shoe assemblies uniformly
preceded by the safety alert symbol ! against the drum, which is attached to the driven
component. The friction shoe assemblies, which
DANGER consist of friction blocks attached to aluminum
backing plates, are guided by torque bars which
Denotes the most serious hazard, and is used are secured to side plates. The torque flow is
when serious injury or death WILL result from the driving shaft, through the element
from misuse or failure to follow specific mounting component (typically an iron spider),
instructions. through the rim/side plate structure, through the
torque bars to the backing plates and friction
WARNING material, where the torque is transmitted
through the friction couple to the components
Used when serious injury or death MAY mounted on the driven shaft (clutch drum and
result from misuse or failure to follow specific drum mounting component). As actuating air is
instructions. exhausted, release springs and centrifugal force
assure positive disengagement.
CAUTION 1.2.1.1 In some cases, the spider and element assembly
Used when injury or product/equipment damage may be mounted to the driven shaft rather
may result from misuse or failure to follow than the driving shaft. This “reverse-mounted”
specific instructions. arrangement is typically used when retrofitting
a mill drive and it is more practical to drill the
It is the responsibility and duty of all personnel pinion shaft for the air supply rather than the
involved in the installation, operation and motor shaft In these cases, the operation and
maintenance of the equipment on which this torque flow description is opposite to what is
device is used to fully understand the: stated above.

DANGER 1.2.2 For applications where the clutch is mounted

on a motor shaft having plain bearings, an axial
WARNING locking device is used to hold the motor on
magnetic center during operation. Refer to the
CAUTION INSTALLATION section for axial locking device
adjustment.
procedures by which hazards can be avoided.
1.2.2.1 Figure 3A illustrates another type of axial locking
1.1 Description device called a separation restraint. This device
is attached to the clutch rim as shown, with a
1.1.1 The Airflex air-actuated VC clutch is specifically bronze wear pad which rides against the clutch
designed and manufactured for severe service drum to restrict axial movement.
encountered in grinding mill operations, where
high starting loads and sustained slippage would N ote : There is no relative motion between the
normally lower clutch efficiency and reduce drum and wear pad when the clutch is
operating life. Constricting action and ventilated fully engaged.
construction make high torque capacity and rapid
heat dissipation possible.
1.1.2 All Airflex VC elements are supplied with long
wearing, NON-ASBESTOS friction material.
1.1.3 Airflex element assemblies are available for
drum diameters from 11.5 inches through 76
inches. The element size designation indicates
the nominal drum diameter in inches, the clutch
model and the width of the friction material.
For example, size “38VC1200” indicates the
element operates on a drum having a nominal
diameter of 38 inches, is an Airflex ‘VC’ series
clutch and has friction material which is 12 inches
wide.
1.1.4 Where diameter space is limited, or the torque
required is greater than a single element can
transmit, all sizes of Airflex VC elements can be
supplied as dual units.

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 Airflex model VC Grinding mill clutches

Figure 2

1.3 Clutch adjustment 1.3.2 To achieve the desired mill acceleration time,
a flow control valve is installed in the clutch air
1.3.1 Airflex VC clutches are completely self-adjusting supply line and adjusted to restrict airflow to the
and automatically compensate for lining and clutch, while allowing free flow away from the
drum wear. Lubrication is not required. clutch for rapid disengagement. By adjusting the
The torque developed is dependent upon flow rate of engagement may be varied. Note
rotating speed and applied air pressure. that the flow control valve does not regulate air
By limiting the applied pressure, the element pressure the supply pressure must always be
will act as a torque limiting device and provide adequate to transmit the maximum required
overload protection. torque. Refer to the INSTALLATION section
of this manual for a recommended air piping
configuration and the OPERATION section for
flow control valve adjustment.
.

Figure 3 Figure 3A

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Airflex model VC Grinding mill clutches

2.0 Installation

WARNING
Only qualified personnel should install, adjust
or repair these units. Faulty workmanship will
result in exposure to hazardous conditions or
personal injury.
CAUTION
Do not inflate the element without having a
drum in place. Inflation of the element without a
drum in place will result in permanent damage to
the element components.

2.1 Mounting arrangements

2.1.1 Airflex VC grinding mill clutch applications are
available in single-narrow, single-wide, dual-
narrow and dual-wide mounting configurations.
See Figure 4. The clutch configuration is
determined by the motor horse-power and
RPM, the allowable motor overload (per cent
rated horsepower) for mill starting, the inertia of
the mill and the charge, and the physical space
available for the clutch. With the exception of
single-narrow arrangements, all clutches can be
supplied with axial locking devices.
2.2 Mounting considerations
2.2.1 Shaft alignment must be within the tolerances
indicated in the Alignment section of this manual.

CAUTION
Operation with shaft misalignment exceeding
the limits indicated in this manual will result in
accelerated wear of the clutch components.

2.2.2 The element must be protected from

contamination from oil, grease or excessive Figure 4
amounts of dust.
2.2.3 All mounting fasteners must be of the proper size
CAUTION and grade, and torqued to the appropriate value.
See Table 1.
Oil or grease contamination will result in a
reduction of developed torque. Excessive WARNING
dust contamination may result in incomplete
disengagement. Either of these conditions will Use only the proper grade and number
result in clutch slippage and overheating. of mounting fasteners. Using commercial
grade fasteners (Grade 2) in place of Grade
8 fasteners (where called for) may result in
CAUTION failure under load, causing personal injury or
All rotating equipment must be guarded to equipment damage.
comply with applicable safety standards.

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Table 1. Fastener assembly torque

Element to spider/side
Size plate to rim Torque Drum to hub Torque
SN11.5VC500 3/8-16NC GR 2 D 15 (20) 1/2-13NC GR 2 D 38 (51)
SN14VC500 1/2-13NC GR 2 D 15 (20) 1/2-13NC GR 2 D 38 (51)
SN16VC600 1/2-13NC GR 2 D 38 (51) 3/4-10NC GR 2 L 93 (126)
SN20VC600 1/2-13NC GR 2 D 38 (51) 3/4-10NC GR 2 L 93 (126)
SN24VC650 5/8-11NC GR 2 D 77 (104) 3/4-10NC GR 2 L 93 (126)
SN28VC650 5/8-11NC GR 2 D 77 (104) 3/4-10NC GR 2 L 93 (126)
SN33VC650 3/4-10 NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)
SN37VC650 3/4-10NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)
SN42VC650 3/4-10NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)

DN 11.5VC500 3/8-16NC GR 2 D 15 (20) 1/2-13NC GR 8 D 109 (148)

DN14VC500 1/2-13NC GR 8 D 87 (118) 1/2-13NC GR 2 D 38 (51)
DN16VC600 1/2-13NC GR 2 D 38 (51) 3/4-10NC GR 8 L 245 (332)
DN20VC600 1/2-13NC GR 8 D 87 (118) 3/4-10NC GR 8 L 211 (286)
DN24VC650 5/8-11NC GR 2 D 77 (104) 3/4-10NC GR 2 L 93 (126)
DN28VC650 5/8-11NC GR 2 D 77 (104) 3/4-10NC GR 2 L 93 (126)
DN33VC650 3/4-10NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)
DN37VC650 3/4-10NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)
DN42VC650 3/4-10NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)

SW 14VC1000 1/2-13NC GR 2 D 38 (51) 1/2-13NC GR 8 L 109 (148)

SW 16VC1000 1/2-13NC GR 2 D 38 (51) 3/4-10NC GR 2 L 93 (126)
SW 20VC1000 1/2-13NC GR 2 D 38 (51) 3/4-10NC GR 2 L 93 (126)
SW24VC1000 5/8-11NC GR 2 D 77 (104) 3/4-10NC GR 2 L 93 (126)
SW28VC1000 5/8-11NC GR 2 D 77 (104) 3/4-10NC GR 2 L 93 (126)
SW32VC1000 5/8-11NC GR 2 D 77 (104) 3/4-10NC GR 2 L 93 (126)
SW38VC1200 3/4-10NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)
SW42VC1200 3/4-10NC GR 2 L 93 (126) 3/4-10NC GR 2 L 93 (126)
SW46VC1200 7/8-9NC GR 2 L 109 (148) 1-8NC GR 2 L 163 (221)
SW52VC1200 7/8-9NC GR 2 L 109 (148) 1-8NC GR 2 L 163 (221)
SW51VC1600 7/8-9NC GR 2 L 109 (148) 1-8NC GR 2 L 163 (221)
SW60VC1600 1-8NC GR 2 L 163 (221) 1 1/2-6NC GR 2 L 566 (767)
SW66VC1600 1 1/4-7NC GR 2 L 325 (441) 1 1/2-6NC GR 2 L 566 (767)

DW 16VC1000 1/2-13NC GR 8 D 87 (118) 3/4-10NC GR 8 L 245 (332)

DW20VC1000 1/2-13NC GR 8 D 87 (118) 3/4-10NC GR 8 L 245 (332)
DW24VC1000 5/8-11NC GR 8 D 174 (236) 3/4-10NC GR 8 L 245 (332)
DW28VC1000 5/8-11NC GR 8 D 174 (236) 3/4-10NC GR 8 L 245 (332)
DW32VC1000 5/8-11NC GR 8 D 174 (236) 3/4-10NC GR 8 L 245 (332)
DW38VC1200 3/4-10NC GR 8 L 245 (332) 3/4-10NC GR 8 L 245 (332)
DW42VC1200 3/4-10NC GR 8 L 245 (332) 3/4-10NC GR 8 L 245 (332)
DW46VC1200 7/8-9NC GR 2 L 109 (148) 1-8NC GR 8 L 510 (692)
DW52VC1200 7/8-9NC GR 2 L 109 (148) 1-8NC GR 8 L 510 (692)
DW51VC1600 7/8-9NC GR 2 L 163 (221) 1-8NC GR 8 L 510 (692)
DW60VC1600 1-8NC GR 2 L 190 (258) 1 1/2-6NC GR 2 L 650 (881)
DW66VC1600 1 1/4-7NC GR 2 L 380 (515) 1 1/2-6NC GR 2 L 650 (881)
DW76VC1600 1 1/4-7NC GR 2 L 380 (515) 1 1/2-6NC GR 2 L 650 (881)
DW76VC2000 1 1/4-7NC GR 2 L 380 (515) 1 1/2-6NC GR 2 L 650 (881)
SN = SINGLE NARROW SW = SINGLE WIDE DN = DUAL NARROW DW = DUAL WIDE
L = LUBED TORQUE - FT.LB.(Nm) (30wt. Motor oil or anti-seize) D = DRY TORQUE - FT.LB.(Nm)

Hex sizes (in.)

Size Bolt Nut Size Bolt Nut Size Bolt Nut
3/8NC 9/16 9/16 3/4NC 1-1/8 1-1/16 1-1/4NC 1-7/8 1-13/16
1/2NC 3/4 3/4 7/8NC 1-5/16 1-1/4 1-1/2NC 2-1/4 2-3/16
5/8NC 15/16 15/16 1NC 1-1/2 1-7/16 - - -

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Airflex model VC Grinding mill clutches

2.3 Mounting spider and drum hub

2.3.1 The spider and drum hub are bored for a press
fit onto their respective shafts. The interference
is approximately 0.0005 inch per inch
(0.0127mm/mm) of shaft diameter.
2.3.2 Ensure the shaft is dean and free of nicks or
burrs and check the shaft and bore diameters for
proper fit. Tap the key into the keyway, making
sure it bottoms, and apply a light coat of
anti-seizing compound to the shaft and key.
2.3.3 Heat the drum hub or spider uniformly to 250°F
(121°C) to expand the bore

CAUTION
Figure 5
It is recommended the drum hub or spider be
heated in oil or an oven; however, torches may
be used. Use several with “rosebud” (broad- 2.4.1 Foundations must be set so distance “X”, shown
flame) tips and keep them moving to avoid “hot on Figure 5 (or the appropriate drawing for
spots”. Check bore temperature frequently to non-standard applications), is established. If
avoid overheating. the clutch is mounted on a shaft having plain
bearings, make sure the shaft is centered
within the bearings when establishing the “X”
2.3.4 Slide the heated drum hub or spider onto the dimension. Refer to Table 2 for appropriate “X”
shaft. Hold in position and allow to cool. dimensions.
2.4 Shaft alignment N ote : It is presumed that one of the shafts
Parallel alignment tolerance (offset): has been properly located and anchored.
When setting and aligning the grinding
Not to exceed 0.010 inch (0.254 mm) mill drive components, always work from
Total Indicator Reading (0.005 inch (0.127mm) the pinion back to the motor.
maximum off- set).
Angular alignment tolerance (gap): 2.4.2 Fabricate a rigid bracket for supporting a dial
indicator and attach to the spider shown on
Not to exceed 0.0005 inch per inch Figure 5 .
(0.0127mm/ mm) diameter at which readings
are taken (“D” on Figure 5). 2.4.3 Thoroughly clean the flange O.D. and the face of
N ote : The alignment procedure described below the drum hub where alignment readings are to
has been used successfully on many VC be taken.
grinding mill clutch applications. Other
procedures, of course, may be used;
however, the alignment tolerances are the
same regardless of the technique used.

Table 2. “X” Dimensions (Fig 5)

Size “X” In. (mm) Size “X” In. (mm) Size “X” In. (mm) Size “X” In. (mm)
SN11.5VC500 6.750 (171.5) DN 11.5VC500 13.375 (339.7) SW14VC1000 11.875 (301.6) - -
SN14VC500 6.812 (173.0) DN14VC500 13.438 (341.3) SW16VC1000 11.875 (301.6) DW16VC1000 12.750 (323.9)
SN16VC600 8.062 (204.8) DN16VC600 15.938 (404.8) SW20VC1000 11.875 (301.6) DW20VC1000 12.750 (323.9)
SN20VC600 8.062 (204.8) DN20VC600 15.938 (404.8) SW24VC1000 11.875 (301.6) DW24VC1000 12.750 (323.9)
SN24VC650 8.562 (217.5) DN24VC650 16.688 (423.9) SW28VC1000 11.875 (301.6) DW28VC1000 12.750 (323.9)
SN28VC650 8.562 (217.5) DN28VC650 16.688 (423.9) SW32VC1000 11.938 (303.2) DW32VC1000 12.812 (325.4)
SN33VC650 8.562 (217.5) DN33VC650 16.750 (425.5) SW38VC1200 14.125 (356.7) DW38VC1200 15.000 (381.0)
SN37VC650 8.562 (217.5) DN37VC650 16.750 (425.5) SW42VC1200 14.125 (358.7) DW42VC1200 15.125 (384.2)
SN42VC650 8.562 (217.5) DN42VC650 16.750 (425.5) SW46VC1200 14.125 (358.7) DW46VC1200 15.250 (387.4)
- - - - SW52VC1200 14.625 (371.5) DW52VC1200 15.750 (400.0)
- - - - SW51VC1600 18.875 (479.4) DW51VC1600 20.000 (508.0)
- - - - SW60VC1600 18.750 (476.31) DW60VC1600 20.375 (517.5)
- - - - SW66VC1600 20.500 (520.7) DW66VC1600 22.000 (558.8)
- - - - SW76VC1600 Contact factory DW76VC1600 20.375 (517.5)
- - - - SW76VC2000 Contact factory DW76VC2000 24.374 (619.1)

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2.4.4 Rotate the spider and take parallel alignment 2.5.3.2 Remove the snap ring (2) from the bearing
readings off the drum hub flange O.D. If both housing.
shafts can be rotated together, the alignment
readings are less influenced by any surface 2.5.3.3 After ensuring the shaft (3) is clean and free of
irregularities foreign matter, nicks or burrs in the area between
the two bearing housings, slide the bearing
N ote : On reverse-mounted clutches where only housing assembly toward the opposite bearing
one shaft can be rotated, the indicator is housing assembly to expose the bearing/spacer
assembly (10,11,16).
attached to the drum hub and readings are
taken off of the spider O.D. 2.5.3.4 Remove the bearing locknut and lockwasher
(13,14) from the shaft.
CAUTION 2.5.3.5 The assembled length of the axial locking device
When recording parallel alignment readings, is established by the location of the bearings
“sag” of the indicator/indicator bracket must be with respect to the shaft. The assembled length
accounted for. can therefore be adjusted by moving spacers
from one side of the bearing to the other. Two
thicknesses of spacers are included in each
2.4.5 Angular alignment readings can be made
assembly (0.025 inch (0.6 mm) and 0.098
by accurately measuring the gap between
inch (2.5 mm)). After making the appropriate
the spider and drum hub faces with an inside
assembled length adjustment, reassemble,
micrometer. If a dial indicator is used, make
making sure the thinner spacers are against
sure to monitor and correct for any axial
the bearing.
movement of the shaft. To reduce the influence
any surface irregularities may have on the angular 2.5.3.6 Tighten the locknut sufficiently to take up all
alignment readings, index the spider 90 degrees axial clearance in the bearing/spacer/snap ring
after taking the initial set of readings. Take an assembly.
additional set of readings and index the spider
another 90 degrees.Continue in this manner 2.5.3.7 Slide the housing back over the bearing and
until four sets of readings have been taken. install the snap ring.
For misalignment correction, use the average of 2.5.3.8 Secure and tighten the bearing housing to the
the four readings at each position. adapter plate using four hex head screws and
2.4.6 Shim and shift the base of the movable shaft lockwashers. Tighten the screws to 35 ft.lb.
to correct the misalignment. After tightening (47Nm).
the base, recheck the alignment and correct if
necessary. Make sure to check for a “soft foot”
condition. Dowel or chock into position after
satisfactory alignment has been achieved.
N ote : On some applications, thermal growth of
the mill or gear reducer (if present) may
result in unacceptable shaft alignment in
a running condition. It is always a good
practice to make a “hot alignment” check
and the shim if necessary.
2.5 Axial locking device adjustment
2.5.1 If the “X” dimension shown on Table 2 could
not be achieved within +/- 0.250 inch (6.4mm),
the axial locking device has a provision to
accommodate this variation.
2.5.2 Position the motor shaft on its magnetic center
and measure the gap between the faces of
the drum hub and spider (“X” dimension on
Table 2 ). The difference between this measured
dimension and the value shown on Table 2
is the amount of correction to be made with
adjustment of the axial locking device.
2.5.3 Referring to Figure 6 , the overall length of
the axial locking device can be adjusted by
relocating shims (11,16) from one side of a
bearing to another.
2.5.3.1 Remove four hex head screws and lock washers
(6,7) from the bearing housing (8) and adapter
plate (1 or 9). Figure 6

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Airflex model VC Grinding mill clutches

2.5.3.9 After completing assembly, lubricate both

bearings with No.2 EP grease. CAUTION
2.6 Installation of element and drum Do not attempt to pull the motor shaft back onto
(narrow, dual narrow and single wide) magnetic center by tightening the axial locking
device mounting screws. To do so will damage
2.6.1 Note the orientation of the drum flange with the axial locking device.
respect to the air connection(s) on the element
and slide the drum into the element. 2.7 Installation of element and drums
2.6.2 Attach the axial locking device (if required) to the (dual wide)
drum flange with the appropriate screws and
2.7.1 Separate the shafts as far as the bearing
lockwashers. There are tapped holes in the drum
clearances will allow.
flange to accept the screws.
2.7.2 Attach the drum having the female register on
2.6.3 Separate the shafts as far as the bearing
the drum flange to the drum hub with short
clearances will allow and hoist the element/drum
screws and lockwashers. There are tapped holes
(axial locking device) into position. If an axial
in the drum flange to accept the screws. Make
locking device is used, take special care when
sure the bore in the drum flange fully engages
hoisting the element between the shafts. The
the pilot on the drum hub. See Figure 4.
axial locking device mounting plate binds easily
against the spider face. 2.7.3 Disassemble the dual element into two halves
and, noting the orientation of the air connections,
2.6.4 Attach the drum to the drum hub with the
place the element onto the drum installed in
appropriate fasteners. See Table 1. Make sure
2.7.2.
the bore in the drum flange fully engages the
pilot on the drum hub. 2.7.4 Noting the orientation of the flange on
the remaining drum with respect to tie air
2.6.5 Install the air connection gaskets onto the
connections on the remaining element, slide
air tubes. The metal backup washer is to be
the drum into the element.
positioned toward the elbow (away from the
spider). See Figure 7 . 2.7.5 Attach the axial locking device (if required)
to the flange of the remaining drum with the
N ote : Some older elements use a flanged air
appropriate short screws and lockwashers.
connection tube and a thin gasket.
There are tapped holes in the drum to accept
See Table 3 . for correct part numbers.
the screws.
2.7.6 Hoist the element/drum (axial locking device)
into position, align the tapped holes in the drum
having the male pilot with the tapped holes in
the drum attached to the drum hub, and attach
both drums to the drum hub with the appropriate
fasteners. See Table 1. Make sure the male pilot
fully engages the female register. If an
axial locking device is used, take special care
when hoisting the element between the shafts.
The axial locking device mounting plate binds
easily against the spider face.
2.7.7 Align the air connections and reassemble the
Figure 7 element halves, making sure the spacers are in
place between the elements. See Figure 8 .
2.6.6 Align the element air connections with the 2.7.8 Reassemble the air connection tubes. If an
passages in the spider and attach the element elbow has been removed, use a good quality
to the spider with the appropriate fasteners. pipe sealant on the threads. See Figure 8 .
See Table 1 . Make sure the element fully
engages the register in the spider. N ote : The elbow assemblies on the outboard
element (farthest from the spider) use
2.6.7 Attach the axial locking device (if required) rubber compression sleeves. Make sure
mounting plate to the spider with the appropriate the sleeves are secure on the long
screws andlock washers. Rotate the motor air tubes.
shaft and push the spidertowards the mill until
the axial locking devicemounting plate is flush
against the spider face. Tighten the screws.

12 VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1

 Airflex model VC Grinding mill clutches

2.7.9 Install the air connection gaskets onto the 2.7.11 Attach the axial locking device mounting plate
air tubes. The metal backup washer is to be (if required) to the spider with the appropriate
positioned toward the elbow (away from the screws and lockwashers. Rotate the motor shaft
spider). See Figure 7 . and push the spider toward the mill until the axial
locking device mounting plate is flush against the
2.7.10 Align the element air connections with the spider face. Tighten the screws.
corresponding passages in the spider and attach
the element to the spider with the appropriate
fasteners. See Table 1 . Make sure the element CAUTION
fully engages the register in the spider.
Do not attempt to pull the motor shaft back onto
magnetic center by tightening the axial locking
device mounting screws. To do so will damage
the axial locking device

Table 3. Air connections for VC Elements

Old method Current method

Flanged tube Straight method

Size Air tube Washer Air tube Washer
11.5VC500 201402 72 x 15 412178-02 412324-01
14VC500 201302 72 x 11 412178-03 412324-02
16VC600 201302 72 x 11 412178-03 412324-02
20VC600 201302 72 x 11 412178-03 412324-02
24VC650 201286 72 x 12 412178-05 412324-03
28VC650 201286 72 x 12 412178-05 412324-03
33VC650 201284 72 x 13 412178-06 412324-04
37VC650 201284 72 x 13 412178-06 412324-04
42VC650 201284 72 x 13 412178-06 412324-04

14VC1000 201302 72 x 11 412178-03 412324-02

16VC1000 202408 72 x 11 412178-03 412324-02
20VC1000 201302 72 x 11 412178-03 412324-02
24VC1000 201286 72 x 12 412178-05 412324-03
28VC1000 201286 72 x 12 412178-05 412324-03
32VC1000 201286 72 x 12 412178-05 412324-03
38VC1200 201284 72 x 13 412178-06 412324-04
42VC1200 201284 72 x 13 412178-06 412324-04
46VC1200 202081 72 x 13 412178-07 412324-04
52VC1200 202751 72 x 14 412178-08 412324-05
51VC1600 304213 72 x 14 412178-09 412324-05
60VC1600 304213 72 x 14 412178-18 412324-06
66VC1600 - - 412178-04 412324-06
76VC1600 - - 412178-04 412324-06
76VC2000 - - 412178-04 412324-06

VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1 13

Airflex model VC Grinding mill clutches

2.8.1.3 Use poppet-type solenoid valves. Spool valves

are not recommended.

2.8.1.4 An air line lubricator is not required for the clutch

element; however, if one is used, it must be a
nonadjustable, mist-type.

2.8.1.5 Make sure the flow control valve is installed

with free flow (indicated by an arrow on the
valve body) away from the clutch (free flow to
exhaust).

2.8.1.6 The final connection to the rotorseal MUST be

made with flexible hose and place no radial
load upon the rotorseal. Also, if the rotorseal
is mounted onto the end of a motor shaft, an
insulating coupling must be installed between
the piping and the rotorseal.

CAUTION
Do not use rigid pipe at the connection to the
Figure 8 rotorseal. Rigid piping will result in excessive
loads on the rotorseal bearings, shortening life.
2.8 Air control system
2.8.1 A typical air control system is shown on 2.9 Electrical controls
Figure 9 . Since operating characteristics vary
from one grinding mill to another, following are 2.9.1 The basic Airflex grinding mill clutch control is
some general guidelines for installing the air shown on Figure 10 . This control provides run,
controls. inch and timed inch features only. Timed inch
creates a delay between successive clutch
engagements when spotting the mill to prevent
2.8.1.1 The air receiver tank must be located as close
clutch overheating and damage. Other control
to the clutch as possible (the tank should be
features, such as clutch slip detection, can be
located within 15 feet of the solenoid valve, and
provided as required. Contact Airflex for details.
solenoid valve should be within five feet from the
rotorseal) for consistent clutch response.

2.8.1.2 Use full size piping and valves consistent with

the rotorseal size and keep the number of
elbows to a minimum.

Pressure Switch
Set at min p.s.i. 1.5 to 5 and interlock with Flow control valve 1/2, 3/4& 1-1/2 N P
motor starter so motor cannot be started with
Clutch Bushing clutch engaged. Use normally closed contacts.
Pressure Gauge
PipeNipple
Rotor seal Pipe Elbow

PipeNipple 3-way N/C

PipeTee Flow Control Valve Solenoid Valve
Fiber Coupling Free flow in direction shown
For adjustment refer to form VC001.
Note: Locate complete air tank within 5 feet of HoseAssembly Flow control valve shown is 1-1/4 NPT (42x220).
the rotor seal. Consult factory when locating
air tank at greater distances.
Note: All pipe not identified with airflex part
numbers are to be furnished by customer.
Pressure Switch
Typically set at 90 p.s.i so clutch will disengage.
when supply air pressure drops below this setting.
Use normally open contacts.
Pressure Gauge
Pipe Nipple Relief Valve
PipeTee
Bushing Pipe Nipple PipeNipple Pressure Regulator
Typically set at 100 p.s.i
.

Main AirSupply

Bushing
Air Tank
Bushing
Check Valve Filter

Figure 9. Air piping diagram for grinding mills DrainValve

14 VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1

 Airflex model VC Grinding mill clutches

Table 4. Air tank groups

Single Dual Single Dual Old Old New New
Narrow Narrow Wide Wide Pipe size P/N LA drawing P/N LA drawing
Standard
11.5 to 16 - - - 1/2" 105248 LA-10720 n/a n/a
20 to 28 11.5 to 20 14 to 20 - 1/2" 105248A LA-10721 108702 LA-11702
33 to 42 24 to 28 24 to 28 16 3/4" 105248B LA-10722 108703 LA-11703
- 33 to 37 32 20 to 24 1" 105248C LA-10723 108704 LA-11704
- 42 38 to 42 28 to 32 1 1/4" 105248D LA-10724 108705 LA-11705
- - 46 38 1 1/2" 105248E LA-10725 108706 LA-11706
- - 51 to 66 42 to 46 1 1/2" 105248AP LA-10726 108707 LA-11707
- - 76 51 to 66 1 1/2" 105248AQ LA-10727 108708 LA-11708
- - - 76 (1600 & 2000) 2" n/a LA-10728 108709 LA-11709
Premium
20 to 28 11.5 to 20 14 to 20 - 1/2" 108248A LA-10701 108602 LA-11602
33 to 42 24 to 28 24 to 28 16 3/4" 108248B LA-10702 108603 LA-11603
- 33 to 37 32 20 to 24 1" 108248C LA-10703 108604 LA-11604
- 42 38 to 42 28 to 32 1 1/4" 108248D LA-10704 108605 LA-11605
- - 46 38 1 1/2" 108248E LA-10705 108606 LA-11606
- - 51 to 66 42 to 46 1 1/2" 108248F LA-10706 108607 LA-11607
- - 76 51 to 66 1 1/2" 108248G LA-10707 108608 LA-11608
- - - 76 (1600 & 2000) 2" 108248H LA-10708 108609 LA-11609
Super premium
20 to 28 11.5 to 20 14 to 20 - 1/2" 108094A LA-11191
33 to 42 24 to 28 24 to 28 16 3/4" 108094B LA-11192
- 33 to 37 32 20 to 24 1" 108094C LA-11193
- 42 38 to 42 28 to 32 1 1/4" 108094D LA-11194 N/A N/A
Use Use
- - 46 38 1 1/2" 108094E LA-11195 premium premium
- - 51 to 66 42 to 46 1 1/2" 108094F LA-11196
- - 76 51 to 66 1 1/2" 108094G LA-11197
- - - 76 (1600 & 2000) 2" 108094H LA-11198
- - - Quadramatic 2” 108094GS LA-11197-11 No No
66 and 76 change change

VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1 15

16
Figure 10 Wiring diagram for grinding mill control panel reference : LA- 9811
Note:
Rear view of door Front view of panel 1. Connect additional pressure switch contacts
and/or other interlocking contacts in series
between terminals 5 and 6.
Power supply
Mill running H1 L1 2. Connect auxiliary contact of main motor
Inch CFU starter between terminal 3 and 4. L1 L2
X1
2 G 10 12 11 3 3. If additional stop pushbuttons are required, 575V

230V
3 remove jumper between 7 and 7a 0n terminal board 460V

460V
TB X2 H2 L2 and connect in series. 230V

575V
1 4. If timed inching is used, remove jumper wire
Inch 2 X3 H1 H2 H3 H4
H3 From wire #10 to wire #11 on terminal board, and
Run 2 wire as shown per dotted lines. 230/460/575 VOLT

Power supply
Run Off
8 12 10 9 3 CTR H4 50/60 HERTZ
CTR
4
CUSTOMER'S STARTER
X 9 5 INTERLOCK (SEE NOTE 2) CFU
3 X1 X2 X3 2
6 1
7A 10 CR 2
Stop 7 9 6 1 Pressure 3 way
X 8 7 9 11 10 12 13 Switch See CR solenoid valve
4 5 note 1 6 1
10 14 15 16 17 2
11
12 Mill running
See note 3
13 7 7A 6 10 2
14 13 TR 2 3 G
15 3
16 Inch
11 10 Off Run Run
17 7 Stop 8 9 10
4 X CR 2,5,6,8,9,9
CR
5
Inch CR
2 3 7 9 10 11 12 12 11 10
6
To customer's equipment JUMPER
7
Airflex model VC Grinding mill clutches

fed from customer's power source. See note 4

To operator station or CR TR
enclosure door 8 14 15
NC-IO-TC
Operator station 219005-07 3 4 4 5 CR CR
9 13 2 8T

VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES

2 16 17 TR
Mill running Inch
Customer's Pressure switch
3 Starter interlock 10 12 6.25
7 2 G 10 12 11 Last wire no. 17
3 10 8 5.38 4.75
9 8 8
10 1 2
11 Inch Run 14.7514
Run Off 14 15 16 17 12.7512 10 9.5
3-way single
12 8 12 10 9 solenoid valve
X 9
To customer's equipment 5/16 DIA.(TYP) 7/32 DIA.(TYP)
5/16 DIA.(TYP)
fed from customer's

E-CLCL-TH001-E1
Enclosure for timed Enclosure for
Stop power source Enclosure for operator's station
X 8 7 inching panel
standard panel

From customer's power source.

CP 3089
Electrical control components Equipment list
Bill of mat'l Panel no. Remarks
209811-01 Std. Panel W/pb's,selector,light in door CTR Transformer G.E. 9T58B65 219600-06
105448 209811-02 Std. Panel W/219005-07 operator station CR Control relay C.H G26MR60A ----
209811-03 Timed inching panel W/pb's,selector,light in door TR Timing relay C.H D80ND1A ----
105449 209811-04 Timed inching panel W/219005-07 operator station 1SS Off-inch-run C.H 10250T-152-2-7-T1-T1 219103-15
209811-05 Std. Panel(similar to 209811-02 except nema 4 ENCL.) 1PB Run C.H 10250T-30B-S36 219103-11
209811-15 Std. Panel W/extra terminals and nema 12 ENCL. 2PB Inch C.H 10250T-30B-S18 219104-12
209811-23 Timed panel w/219005-18 station, NEMA 4 ENCL. 3PB Stop C.H 10250T-31R-S36 219102-10
209811-24 Timed panel(sim to 209811-03 except NEMA 4) CFU Fuse BUSS FRN 1.6 219601-11
209811-89 Timed panel(sim to 209811-03 except NEMA 4)GE comp. G Light C.H 10250T-74G-S36 219205-24
209811-93 Std. Panel(sim to 209811-01 except NEMA 4) TB Terminal board G.E. CR151-D21720 219803-04
 Airflex model VC Grinding mill clutches

Table 5. Maximum safe operating speeds

Size Size
(Narrow) Max. (RPM) (Narrow) Max. (RPM) Size (Wide) Max. (RPM) Size (Wide) Max. RPM
11.5VC500 1800 28VC650 1000 14VC1000 1800 42VC1200 670
14VC500 1500 33VC650 900 16VC1000 1400 46VC1200 600
16VC600 1400 35VC650 900 20VC1000 1300 52VC1200 550
20VC600 1200 37VC650 800 24VC1000 1250 51VC1600 550
24VC650 1050 42VC650 800 28VC1000 1100 60VC1600 520
- - - - 32VC1000 1050 66VC1600 480
- - - - 38VC1200 740 76VC1600 275
- - - - - - 76VC2000 275

3.0 Operation 3.2.1 Set the pressure switch (5) located on the air
receiver tank to open at 90 psig (6.1 bar) falling.
WARNING Use normally open contacts and wire in series
with the solenoid valve coil. This pressure switch
Exceeding the operating limits described is used to disengage the clutch if operating
in this section may result in personal pressure falls below 90 psig (6.1 bar), or to
injury or equipment damage. prevent clutch engagement if operating pressure
is below 90 psig (6.1) bar.
3.1 Torque, RPM and pressure limits
3.2.2 Set the pressure switch (13) located in the air
3.1.1 The developed torque is directly proportional to supply line to the clutch to open at approximately
the applied air pressure. If the developed torque 5 psig (0.3 bar). Use normally closed contacts
seems inadequate, check for oil, grease or dust and wire into the motor starter interlock circuit.
contamination.
The purpose of this pressure switch is to prevent
starting the motor with the clutch engaged.
CAUTION
Maximum applied air pressure is 125 psig (8.5 3.2.3 Set the pressure regulator (3) to 100 psig
bar). Operation at pressures exceeding 125 psig (6.8 bar). This is the nominal starting air pressure
may result in damage to the clutch element for the mill.
Airflex grinding mill clutches typically require only
100 psig (6.8 bar) operating pressure. 3.2.4 With the motor “off”, manually trip the solenoid
valve and note the time elapsed for the pressure
CAUTION gauge (7) to register full tank pressure.
The non-asbestos friction material used in Airflex
3.2.5 Repeat the above procedure while adjusting
VC units may not develop rated torque initially,
the flow control valve (11) to supply a pressure
as a short “Wearin” period is required. It is
very important that the first few mill starts be
rate of approximately 20 psig/sec. (1.4 bar/sec.).
monitored to prevent excessive heat generation Due to the non-linearity of the pressure-time
from slippage. curve (See Figure 11 ), it will be easier to use a
reduced value to set the flow control valve. For
3.1.2 Maximum safe operating speeds are shown on example, if the tank pressure is 100 psig (6.8
Table 5. bar), to obtain a flow rate of 20 psig/sec. (1.4 bar/
sec.), time the pressure build up to 80 psig (5.4
bar) and adjust the flow control valve to deliver
DANGER this pressure in 4 seconds, which, for all practical
Do not exceed the operating speeds pur- poses, would equate to the desired 20 psig/
shown on Table 5. Operation at speeds sec. (1.4 bar/sec.).
greater than allowable will result in
permanent damage to the clutch
element, personal injury or death.

3.2 Control component adjustment

The following section gives “typical” component
settings only. Since operating characteristics
vary from one grinding mill to the next, absolute
values cannot be given. The settings described
below offer a good “starting point” to achieve
satisfactory mill acceleration and motor overload
- some “fine tuning” will probably be required.

Figure 11

VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1 17

Airflex model VC Grinding mill clutches

3.2.5.1 The flow rate is increased by turning the flow

control valve adjusting screw clockwise on the
3/4”, 1” and 1 -1/4” valves, and counter-clockwise
on the 1-1/2” valve.The 1-1/2” valve has wrench
flats on the adjusting screw. The 1-1/4” valve has
a knurled adjusting knob.The 3/4” and 1” valves
have slotted adjusting screws.

3.2.6 Manually engage the clutch several times

to verify the flow control valve setting. Also,
confirm operation of the pressure switches
at this time.

3.2.7 Check all other interlocks that affect the starting

of the mill and remove any jumpers that may
have been installed.

CAUTION Figure 12

The flow rate described typically will result in a 4.0 Maintenance

4-7 second mill acceleration time (timed from
the instant the clutch shoes make contact with
the drum to the instant the clutch locks up); WARNING
however, since operating characteristics vary
from mill to mill, the mill acceleration at the Only qualified personnel should
above flow setting may be greater or less than maintain and repair these units. Faulty
the allowable 4-7 second range. workmanship may result in personal
injury or equipment damage.
CAUTION
The non-asbestos friction material used on CAUTION
Airflex VC clutches may not develop rated torque When replacing clutch components, use only
initially, as a short “wear-in” period is required. genuine, Airflex replacement parts. Use of
It is very important that the first few mill starts replacement material which is not of Airflex
be monitored closely to prevent damage to the origin will void all warranties.
clutch components.

3.2.8 Start the motor and engage the clutch, noting

the mill acceleration time. Abort the start if
the clutch slips for more than seven seconds!
3.2.9 Disengage the clutch (if the start has not been
aborted) and allow the drum(s) to cool to room
temperature. Make the appropriate adjustment
to the flow control valve if the mill acceleration
fell outside of the 4-7 second range and retry.
Repeat until the desired acceleration time has
been achieved.
N ote : If the motor overload is beyond allowable
limits during the start (typically the result
of too high operating pressure), reduce
the operating pressure and increase the
flow rate. If the motor is sized correctly
for the mill load conditions, the overload
on the motor is directly proportional to the
applied air pressure - not the flow rate.

18 VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1

 Airflex model VC Grinding mill clutches

CAUTION
Do not use compressed air to blow dust
4.1 Periodic inspection accumulations out of the backing plates.
4.1.1 The following items may be inspected without Although the friction material does not contain
disassembly of the clutch: asbestos, the dust created as the friction
material wears, along with the dust from
4.1.1.1 Friction shoe assembly lining wear- Check the operating environment, may irritate the
the lining thickness and compare to the values respiratory system.
shown on Table 6. If the linings have worn to
minimum allowable thickness or less, they must 4.1.1.3 Air control components - Check for proper
be replaced as a complete set. adjustment of the air control components.
Make sure the safety pressure switches are set
Table 6. Friction material thickness correctly and are functioning properly. Repair any
Narrow series
air leaks as discovered.
Min. allowable Original lining 4.1.2 Partial or complete disassembly is required to
lining thickness, thickness, inch inspect the following items:
Element size inch (mm) (mm)
11.5VC500 thru 0.15 (3.8) 0.33 (8.4) 4.1.2.1 Drum diameter wear - Check the O.D. of the
20VC600 drum and compare to the values shown on
24VC650 thru 0.15 (3.8) 0.45 (11.4) Table 7 . Minor heat-checking may be removed by
28VC650 machining the drum O.D. If the drum has been
33VC650 thru 0.28 (7.1) 0.58 (14.7) subjected to excessive heat, the open end may
42VC650 flare out, giving the impression that the drum has
Wide series not worn. It is therefore important to check the
14VC1000 thru 0.15 (3.8) 0.33 (8.4) diameter at several locations across the face.
20VC1000
24VC1000 thru
28VC1000
0.15 (3.8) 0.45 (11.4) CAUTION
32VC1000 thru 0.38 (9.5) 0.58 (14.7) Operation of the clutch on a drum that has worn,
42VC1200 or has been machined, to less that minimum
46VC1200 thru 0.38 (9.5) 0.69 (17.5) allowable diameter will result in damage to the
52VC1200 element components.
51VC1600 thru 0.30 (7.6) 0.67 (17.0)
76VC2000
4.1.2.2 Air actuating tube - Check that the tube has not
been damaged by excessive heat. If any portion
of the tube is hard or charred, the tube must be
replaced. Check for any blisters, which would
CAUTION indicate ply separation. A tube in this condition
must also be replaced.
Operation with friction material worn to less
than minimum allowable thickness will result in 4.1.2.3 Friction shoe lining wear - If the linings are
damage to the drum. glazed, they may be lightly sanded to remove the
glazing providing they do not contain asbestos
N ote : A wear indicating groove See Figure 12
is provided on each end of the friction WARNING
block. The maximum wear point, which
coincides with the values shown on Clean the edge of the lining and note the
Table 6 , is at the bottom of the groove. presence of a blue stripe and a white
4.1.1.2 Contamination of shoes or drum - Oil or
stripe along with brass flakes in the
grease contamination will reduce the developed friction material. If the above exists,
torque of the clutch. Disassembly will be the linings contain asbestos. Using the
required to clean any oil or grease buildup. appropriate precautions for working with
In extremely dusty environments, dust may asbestos, remove the linings and dispose
accumulate in the backing plate cavities to the of properly. DO NOT ATTEMPT TO SAND
point where the friction shoes will not properly FRICTION MATERIAL CONTAINING
retract. Dust accumulations may be vacuumed ASBESTOS.
out of the cavities.
CAUTION
CAUTION
When working with any friction material,
Do not attempt to use a solvent to remove oil or regardless of whether or not it contains asbestos,
grease without first removing the element. While always wear approved safety equipment. Material
squirting a solvent into an installed clutch may containing asbestos.
improve performance temporarily, a fire hazard
exists from the heat generated during slippage

VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1 19

Airflex model VC Grinding mill clutches

4.1.2.4 Uneven friction lining wear - Tapered wear 4.1.2.9 Excessive dust accumulation - If dust
across the friction surface typically indicates a becomes packed in the backing plate cavities,
worn drum and/or misalignment. If two or more a pressurized enclosure should be considered.
adjacent shoes are worn on one end only, the air Excessive accumulations will prevent complete
actuating tube has most likely developed a ply shoe retraction.
separation at that location.
4.2 Removal of element assembly and drum
4.1.2.5 Backing plate wear - Wear on the ends of the (narrow, dual narrow and single wide)
backing plates from bearing against the side
plates is indicative of misalignment or thrusting.
If wear is on one end only, and uniform for all
WARNING
backing plates, a worn drum may be causing Prior to removal of the clutch, make sure the
the shoes to thrust as the element engages. If mill is in, and will remain in, a safe condition.
wear exists on both ends of all of the backing
plates, excessive misalignment is probably the 4.2.1 Match mark the element to the spider and the
cause. Slight notching in the torque bar cavity is drum to the drum hub.
normal; however, if the notching occurs in a short
amount of time, check shaft alignment. If both 4.2.2 Disconnect the element from the spider and
walls in the torque bar cavity are notched, there allow it to rest on the drum.
may be a significant vibration (torsional) problem.
4.2.3 Disconnect the axial locking device (if used) from
the spider and separate the shafts as far as the
Table 7. Drum wear limits
bearings will allow.
Narrow series
Max. allowable wear on 4.2.4 Connect an overhead support to the element and
Element size drum diameter* inch (mm)
apply enough tension to support the weight of
11.5VC500 thru 16VC600 0.09 (2) the element and drum.
20VC600 thru 24VC650 0.12 (3)
4.2.5 Remove the fasteners attaching the drum to the
28VC650 0.19 (5)
drum hub and hoist the element/drum out from
33VC656 thru 42VC650 0.19 (5) between the shafts. If an axial locking device
Wide series is used, take special care when hoisting the
14VC1000 thru 16VC1000 0.09 (2) element/drum from between the shafts, as the
20VC1000 thru 24VC1000 0.13 (3) axial locking device mounting plate binds easily
against the spider face.
28VC1000 0.19 (5)
32VC1000 thru 38VC1200 0.19 (5)
42VC1200 thru 46VC1200 0.25 (6)
CAUTION
52VC1600 thru 76VC2000 0.25 (6) Use extreme care when disconnecting the
* N ote : The number preceding the letters “VC” in the drum from the hub. Shear points exist at the
element size designates the original drum mounting holes.
diameter in inches. Example: 16VC600 - Original
drum diameter = 16.00 inches (406 mm). 4.3 Removal of element assemblies and drums
Minimum allowable drum diameter is:16 inch (406 (dual wide)
mm) -0.09 inch (2 mm) = 15.91 inch (404 mm).
4.3.1 Match mark the element assemblies to each
4.1.2.6 Release springs and torque bars - Excessive other and to the spider. Also, match mark the
wear at the ends of the torque bars where the drums to each other and to the drum hub.
release springs make contact indicates excessive 4.3.2 Disconnect the dual element from the spider
parallel mis- alignment. and allow it to rest on the drums. Remove the air
4.1.2.7 Side plates - Any wear on the backing plates will connection tubes.
also be reflected as elongation of the torque bar 4.3.3 Remove the fasteners and spacers attaching the
holes in the side plates. element halves together.
4.1.2.8 Contamination of friction shoes - Mild oil or 4.3.4 Disconnect the axial locking device (if used) from
grease contamination may be removed with a the spider and separate the shafts as far as the
solvent. Linings which have become saturated bearings will allow.
must be replaced. Also, linings that have been
charred from excessive heat must be replaced. 4.3.5 Attach an overhead support to the spider-side
element and apply enough tension to support
the weight of the element half and one of the
CAUTION drums.
When using any solvent, always follow the
4.3.6 Remove the through bolts and nuts attaching
appropriate safety precautions.
the drums to the drum hub. Do not remove the
short screws and lockwashers which hold the
female drum onto the drum HUB . Carefully
hoist the spider-side element and drum out from
between the shafts. If an axial locking device
is used, take special care when hoisting the

20 VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1

 Airflex model VC Grinding mill clutches

Snap ring and counterbore eliminated Counterbore eliminated and second snap ring groove added

11.5VC500 24VC650 42VC650 24VC1000 38VC1200 46VC1200 51VC1600

14VC500 28VC650 14VC1000 28VC1000 42VC1200 52VC1200 60VC1600
16VC600 33VC650 16VC1000 32VC1000 66VC1600
20VC600 37VC650 20VC1000
Figure 13

element/ drum from between the shafts, as the CAUTION

axial locking device mounting plate binds easily
against the face of the spider. Whenever the element is removed and
disassembled, it is always good practice to
4.3.7 Attach an overhead support to the remaining replace the release springs.
element and apply enough tension to support
the weight of the element and drum. 4.5.4 Remove the air connection elbows and spiral
4.3.8 Remove the short screws and lockwashers snap rings which secure the air actuating tube
holding the drum onto the drum hub and to the rim. Smaller size elements do not use
carefully hoist the element and drum out from snap rings. Carefully remove the air actuating
between the shafts. tube from the rim and thoroughly inspect.
Replace if necessary.
CAUTION N ote : The snap rings may no longer be
required on certain size elements.
Use extreme care when disconnecting the
drums from the drum hub. Shear points exist at Also, rims manufactured before 1984
the mounting holes. were counterbored at the tube valve hole
to accept the snap ring. This counterbore
has been eliminated, and a second snap
4.4 Removal of spider and drum hub ring groove has been added to the tube
4.4.1 Removal may not be necessary. Removal may valve. See Figure 13 .
only be needed access is needed to motor shaft, 4.5.5 Remove the remaining side plate only if it is to
pinion shaft, or gearbox shaft. be replaced.
4.4.2 Puller holes are provided for removal.
It will require heating along with the puller.
4.6 Friction lining replacement
When heating, use torches with rosebud tips.
Heat uniformly to prevent hot spots and do not CAUTION
exceed 275 degrees F. Use only genuine Airflex replacement parts.
4.5 Disassembly of the element Use of replacement parts not of Airflex origin will
void all warranties.
4.5.1 Lay the element flat on a clean work surface.
4.5.2 Remove one of the side plates and inspect the 4.6.1 Make sure the torque bars and release springs
surface that the friction shoes contact for any have been removed from the backing plates.
unusual wear patterns, especially look at the 4.6.2 For riveted friction shoe assemblies, drill the
end scallops on the side plates and check for rivets with a 15/64 inch (6 mm) drill and tap the
excessive wear. rivet body out. Larger elements have linings
4.5.3 Remove the friction shoe assemblies, torque attached with flat head screws and locknuts.
bars and release springs. If the torque bars and Airflex special wrench p/n 304572 will aid in
springs come out of the element with the friction holding the locknuts during removal. See Table 8 .
shoe assemblies, carefully tap them out of the
backing plate cavities. Note wear and replace
as necessary.

VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1 21

Airflex model VC Grinding mill clutches

4.6.3 Attach the new lining to the backing plate with

new screws and locknuts or drive pin rivets 4.7.6 Lay the remaining side plate in position so
(See Figure 14 ), as applicable. Work from the the air connections and torque bar holes are
center of the friction lining out to the ends. properly aligned.
The rivets are installed by driving the pin flush 4.7.7 Carefully guide the torque bars into the
with the head. corresponding holes in the side plate.
It is often helpful to install four equally spaced
screws and nuts through the rim and side
plate to keep some tension on the side plate
throughout this step.
4.7.8 Attach the side plate to the rim with cap screws
and lockwashers, making sure all of the torque
Table 8. Friction shoe assembly fasteners bars are seated in their side plate holes.
Drive pin rivets 4.7.9 Note the orientation of the air connections and
11.5VC500 24VC650 42VC650 24VC1000 install the through bolts and locknuts where
14VC500 28VC650 14VC1000 28VC1000 applicable.
16VC600 33VC650 16VC1000 4.7.10 Re-install the elbows using a good quality
20VC600 37VC650 20VC1000 sealant on the pipe threads. Install the air
Flat head screws* (brass) and locknuts connections on single narrow, dual narrow and
32VC1000 46VC1200 60VC1600 76VC2000 single wide elements. Install only the short air
connections (element closest to spider) on dual
38VC1200 52VC1200 66VC1600
wide elements.
42VC1200 51VC1600 76VC1600
* Screws are 3/8-16NC2 X 1.25 long flat head and should be tightened to 4.7.11 Re-install per 2.0.
12 ft-lbs (dry)
5.0 Spare parts storage
5.1 Element assemblies
5.1.1 Element assemblies must always be stored flat.
Storage in the standing position may cause the
rims to go out-of-round.
5.2 Drums
5.2.1 Drums must be stored open end down. Similar
to element assemblies, storage of a drum in the
standing position will adversely affect roundness.
5.3 Air actuating tubes
5.3.1 Air actuating tubes are shipped from the Airflex
plant folded to conserve shipping space. Upon
Figure 14 receipt, remove the tube from its container and
4.7 Assembly of the element allow it to assume its natural shape. Store in a
cool, dry area, away from electrical equipment
4.7.1 Make sure all of the components have been and ultraviolet light.
cleaned and any damaged or worn components
have been repaired or replaced.
4.7.2 Assemble one of the side plates to the rim with
cap screws and lockwashers. It is not necessary
to install through bolts and locknuts at this time.
4.7.3 Lay the rim/side plate assembly on a clean, flat
work surface, side plate down.
4.7.4 Carefully insert the air actuating tube into the
rim. Push the valves on the tube through the
corresponding holes in the rim and install the
spiral snap rings (if applicable). Figure 15

4.7.5 Place a torque bar in each mating hole in the

side plate, slide a friction shoe assembly onto
each torque bar and carefully tap a release spring
(51VC1600, 60VC1600 and 66VC1600 elements
have two release springs in each cavity) into
place. Make sure the spring is positioned on the
side of the torque bar opposite the friction lining.
Also, the spring must contact the torque bar at
two points, not one. See Figure 15 .

22 VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1

 Airflex model VC Grinding mill clutches

6.0 Ordering information/ technical

assistance
6.1 Equipment reference
6.1.1 If possible locate the Airflex assembly drawing(s)
and bill of material to insure the correct spare
parts are used.
6.1.2 In any correspondence regarding Airflex
equipment, refer to the information on the
product nameplate. If not available, note the
drum diameter, air connection configuration,
mounting arrangement or any other special
features and call or write:

THE PART LISTS ON THE FOLLOWING PAGES APPLY TO STANDARD GRINDING MILL
APPLICATIONS ONLY. HIGH-TORQUE APPLICATIONS AND CERTAIN RETROFIT APPLICATIONS
WILL HAVE DIFFERENT COMPONENT PARTS. CONSULT THE FACTORY IF HAVING DIFFICULTY
IDENTIFYING PART NUMBERS.
When repairing Airflex products, it is recommended to only use currently Danfoss AIRFLEX
genuine product and an authorized DANFOSS AIRFLEX repair and rebuild facility. A listing of
these may be found at “www.eaton.com”

VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1 23

24
7.0 Parts lists
7.1 Single narrow element assemblies

Item
1 2 3 4 5 6 7 10 11 12 13
Part no. of Part Part
Element # of complete no. no. Part Part Part Part Part no. Part Part
description Air InL element 1 reqd. 1 reqd. no. Qty. no. Qty. no. Qty. Part no. Qty. no. Lining Rivet 2 reqd no. no.
11.5VC500 Minus side conn. 1 or 2 142639HA 403089 403090 - - - - - - - - 414576 414575 130 X 72 412123 201372 201373
8 Req’d 8 Req’d 48 Req’d 8 Req’d 8 Req’d
Side conn. 2 142639HP 131 X 11 2 131 X 20 2 412178- 2 412324-01 2
02
14VC500 Minus side conn. 1, 2 or 4 143829HA 406273 406274 - - - - - - - - 414513 41457 130 X 72 412124 307353 307354
8 Req’d 7 Req’d 80 Req’d 8 Req’d 8 Req’d
Side conn. 2 143829HP 92 X 6 2 87 X 12 2 412178- 2 412324-02 2
03
16VC600 Minus side conn. 1, 2 or 4 142640HA 402703 402704 - - - - - - - - 414580 414579 130 X 72 412125 201301 301352
8 Req’d 8 Req’d 80 Req’d 8 Req’d 8 Req’d
Side conn. 2 142640HP 92 X 6 2 87 X 12 2 412178- 2 412324-02 2
03
20VC600 Minus side conn. 1, 2 or 4 142641HA 402732 402733 - - - - - - - - 307369 307358 130 X 71 412126 201301 301352
10 Req’d 10 Req’d 100 Req’d 10 Req’d 10 Req’d
Side conn. 2 142641HP 92 X 6 2 87 X 12 2 412178- 2 412324-02 2
Airflex model VC Grinding mill clutches

03
24VC650 Minus side conn. 1, 2 or 4 142642HA 402803 402804 - - - - - - - - 414582 414581 130 X 72 412127 201285 301352
12 Req’d 12 Req’d 120 Req’d 12Req’d 12 Req’d
Side conn. 2 142642HP 92 X 7 2 87 X 14 2 412178- 2 412324-03 2
05

VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES

28VC650 Minus side conn. 1, 2 or 4 142643HA 402694 402693 - - - - - - - - 414584 414583 130 X 73 412128 201285 301352
14 Req’d 14 Req’d 140 Req’d 14 Req’d 14 Req’d
Side conn. 2 142643HP 92 X 7 2 87 X 14 2 412178- 2 412324-03 2
05
33CV650 Minus side conn. 1, 2 or 4 142644HA 402821 402822 - - - - - - - - 414586 414585 130 X 73 412129 201283 301333
16 Req’d 16 Req’d 160 Req’d 16 Req’d 16 Req’d
Side conn. 2 142644HP 92 X 8 2 87 X 16 2 412178- 2 412324-04 2
06
37VC650 Minus side conn. 1, 2 or 4 142645HA 402671 402670 - - - - - - - - 414586 414585 130 X 73 412130 201283 301333

E-CLCL-TH001-E1
18 Req’d 18 Req’d 180 Req’d 18 Req’d 18 Req’d
Side conn. 2 142645HP 92 X 8 2 87 X 16 2 412178- 2 412324-04 2
06
42VC650 Minus side conn. 1, 2 or 4 142647HA 402829 402830 - - - - - - - - 414590 414589 130 X 73 412131 201283 301333
8 Req’d 8 Req’d 200 Req’d 20 Req’d 20 Req’d
Side conn. 2 142647HP 92 X 8 2 87 X 16 2 412178- 2 412324-04 2
06
 Airflex model VC Grinding mill clutches

7.2 Dual narrow element assemblies

Item Item
Complete Complete
dual Single dual Single
element elements* 8 9 element elements* 8 9
11.5VC500 142112C 142639HA 105808A 105898 28VC650 142118C 142643HA 105811A 105901
14VC500 143114C 143829HA 105809A 105899 33VC650 Element with four142119C 142644HA 105812A 105902
Element with four 142115C
16VC600 side 142640HA 105810A 105900 37VC650 side connections 142120C 142645HA 105812A 105903
connections
20VC600 142116C 142641HA 105810A 105900 42VC650 142121C 142647HA 105812A 105904
24VC650 142117C 142642HA 105811A 105901

* The second column under “ITEM” lists the part number of the two single elements that make up the dual mounted element assembly.

corresponding item column.

VC IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1 25

26
7.3 Single wide element assemblies
Item
1 2 3 4 5 6 7 10 11 12 13
Part no.
No. of of Part Snap
Element air complete no. Tube ring Part Part Part Part Part Part no. Part
description inlets element 1 req’d 1 req’d 4 req’d no. Qty no. Qty no. Qty no. Qty no. Rivet Lining Screw Nut 2 Req’d Part no. no.
14VC 1000 Minus side conn. 1,2 or 4 142838HA 409141- 406978 - - - - - - - - - 414592 130 X 72 414591 - - 412124 303567 303150
01 8 Req’d 98 Req’d 16 Req’d 8 Req’d 8 Req’d
Side connection 2 142838HP 92 X 6 2 87 X 12 2 412178- 2 412324- 2
03 02
16VC 1000 Minus side conn. 1,2 or 4 142821HA 405950- 405954 - - - - - - - - - 414594 130 X 72 414593 - - 412156 301831 301832
01 8 Req’d 80 Req’d 8 Req’d 8 Req’d 8 Req’d
Side connection 2 142821HP 92 X 6 2 87 X 12 2 412178- 2 412324- 2
03 02
Side connection 4 142821HC 4 4 4 4
20VC 1000 Minus side conn. 1,2 or 4 142832HA 503302- 406544 - - - - - - - - - 414596 130 X 72 414595 - - 412157 301831 301832
01 8 Req’d 80 Req’d 8 Req’d 8 Req’d 8 Req’d
Side connection 2 142832HP 92 X 6 2 87 X 12 2 412178- 2 412324- 2
03 02
Side connection 4 142832HC 4 4 4 4
24VC 1000 Minus side conn. 1,2 or 4 142675HA 404666- 404675 - - - - - - - - - 414598 130 X 72 414597 - - 412158 301831 301832
01 10 Req’d 100 10 Req’d 10 Req’d 10 Req’d
Side connection 2 142675HP 92 X 7 2 87 X 14 2 412178- 2 412324- 2 Req’d
05 03
Side connection 4 142675HC 4 4 4 4
28VC 1000 Minus side conn. 1,2 or 4 142674HA 405503- 403745 - - - - - - - - - 414600 130 X 72 414599 - - 412159 301831 301832
01 10 Req’d 100 10 Req’d 10 Req’d 10 Req’d
Airflex model VC Grinding mill clutches

Side connection 2 142674HP 92 X 7 2 87 X 14 2 412178- 2 412324- 2 Req’d

05 03
Side connection 4 142674HC 4 4 4 4
32VC1000 Minus side conn. 1,2 or 4 142673HA 402330- 402327 - - - - - - - - - 414602 - 414601 330 X 206 110 X 23 412160 301839 301718
01 12 Req’d 12 Req’d 120 Req’d 120 Req’d 12 Req’d 12 Req’d
Side connection 2 142673HP 92 X 7 2 87 X 14 2 412178- 2 412324- 2
05 03

VC5001 IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES

Side connection 4 142673HC 4 4 4 4
38VC 1200 Minus side conn. 1,2 or 4 142739HA 404503- 404504 190 X 3 - - - - - - - - 511640 - 511639 330 X 208 110 X 23 412161 302115 301908
01 12 Req’d 12 Req’d 120 Req’d 120 Req’d 12 Req’d 12 Req’d
Side connection 2 142739HP 92 X 8 2 87 X 16 2 412178- 2 412324- 2
06 04
Side connection 4 142739HC 4 4 4 4
42VC 1200 Minus side conn. 1,2 or 4 142677HA 403800- 403799 190 X 3 - - - - - - - - 511642 - 511641 330 X 208 110 X 23 412162 302115 301908
01 14 Req’d 14 Req’d 140 Req’d 140 Req’d 14 Req’d 14 Req’d
Side connection 2 142677HP 92 X 8 2 87 X 16 2 412178- 2 412324- 2
06 04
Side connection 4 142677HC 4 4 4 4

E-CLCL-TH001-E1
46VC 1200 Minus side conn. 1,2 or 4 142671HA 404602 403901 190 X 3 - - - - - - - - 414439 - 414438 330 X 206 110 X 23 412163 302115 301908
16 Req’d 32 Req’d 182 Req’d 192Req’d 16 Req’d 16 Req’d
Side connection 2 142671HP 92 X 8 2 87 X 16 2 412178- 2 412324- 2
07 04
Side connection 4 142671HC 4 4 4 4
52VC 1200 Minus side conn. 1,2 or 4 142841HA 503985 503986 190 X 83 - - - - - - - - 414439 - 414438 330 X 206 110 X 23 412164 303929 301908
18 Req’d 36 Req’d 216 Req’d 216 Req’d 18 Req’d 18 Req’d
Side connection 2 142841HP 92 X 2 87 X 20 2 412178- 2 412324- 2
10 08 05
Side connection 4 142841HC 4 4 4 4
51VC 1600 Minus side conn. 1,2 or 4 142835HA 506674 505580 190 X 83 - - - - - - - - 511644 - 511643 330 X 206 110 X 23 412165 308639 304215
18 Req’d 38 Req’d 286 Req’d 216 Req’d 18 Req’d 36
Side connection 2 142835HP 92 X 2 87 X 20 2 412178- 2 412324- 2 Req’d
10 09 05
Side connection 4 142835HC 4 4 4 4
60VC 1600 Minus side conn. 1,2 or 4 142915MB 510629 511348 190 X 15 - - - - - - - - 511646 - 511645 330 X 208 110 X 23 412166 304214 304215
20 Req’d 40 Req’d 240 Req’d 240 Req’d 20 Req’d 40
Side connection 2 142915MA 153 X 2 87 X 20 2 412178- 2 412324- 2 Req’d
791 18 06
Side connection 4 142915HC 4 4 4 4
66VC 1600 Minus side conn. 1,2 or 4 142097HA 509548 511350 190 X 15 - - - - - - - - 511648 - 511645 330 X 208 110 X 23 509527 304214 304215
22 Req’d 44 Req’d 264 Req’d 264 Req’d 22 Req’d 44
Side connection 4 142097HC 92 X 4 87 X 20 4 412178- 4 412324- 4 Req’d
10 04 06
76VC 1600 Side connection 4 - 515144 515142 190 X 15 92 X 4 87 X 20 4 412178- 4 412324- 4 515156 - 515145 330 X 208 110 X 23 515140 304214 304215
10 04 06 25 Req’d 50 Req’d 300 Req’d 300 Req’d 25 Req’d 50
Req’d
76VC2000 Side connection 4 - 515377 515375 190 X 15 92 X 4 87 X 20 4 412178- 4 412324- 4 515381 - 515380 330 x 23 110 x 23 515384 308576 308577
10 04 06 25 Req’d 50 Req’d 400 Req’d 400 Req’d 25 Req’d 25
Req’d
 Airflex model VC Grinding mill clutches

7.4 Dual wide element assemblies

Item Item
Complete Complete
dual Single dual Single
element elements* 8 9 element elements* 8 9
16VC1000 Element with 142122C 142821HA 105815A 105905 42VC1200 Element with 142128C 142677HA 105817A 105908
20VC1000 four side 142123C 142832HA 105815A 105906 46VC1200 four side 142129C 142671HA 105891A 105909
connections connections
24VC1000 142124C 142675HA 105816A 105901 52VC1200 142131C 142841HA 105893A 105910
28VC1000 142125C 142674HA 105816A 105901 51VC1600 142130C 142835HA 105892A 105910
32VC1000 142126C 142673HA 105816A 105906 60VC1600 142132AL 142915MB 105894A 105911
38VC1200 142127C 142639HA 105817A 105907 66VC1600 142198P 142097HA 105897A -
- - - - - 76VC1600 146509P - - -
- - - - - 76VC2000 146531P - 108131A -

* The second column under “ITEM” lists the part number of the two single elements that make up the dual mounted element assembly.

corresponding item column.

7.5 Drums

Narrow series Wide series

Size Single Dual Size Single Dual (Male) Dual(Female)
11.5VC500 408290 408307* 14VC1000 411111* - -
14VC500 408283 408309* 16VC1000 409506* 412589 412590
16VC600 408292 408311* 20VC1000 410087 410087 410088
20VC600 408294 410862 24VC1000 409794 409794 409795
24VC650 408296 409804 28VC1000 409537 409537 409538
28VC650 409479 409706 32VC1000 410824 410824 410825
33VC650 408300 410022 38VC1200 409474 409474 409475
37VC650 408302 410866 42VC1200 409947 409947 409948
42VC650 408304 409964 46VC1200 409980 409980 409981
* Tapped holes 52VC1200 409715 409715 409716
51VC1600 409711 409711 409712
60VC1600 411501 411501 411502
66VC1600 413727 413727 413726
76VC1600 515149 515149 515150
76VC2000 515382 515382 515383

7.6 Axial locking device

Dual narrow series Single wide series Dual wide series

20VC600 145839DH 20VC1000 145839DP 42VC1200 145839DA 20VC1000 145839DP 46VC1200 145839DC
24VC650 145839DL 24VC1000 145839DS 46VC1200 145839DC 24VC1000 145839DS 52VC1200 145839DT
28VC650 145839DF 28VC1000 145839DG 52VC1200 145839DT 28VC1000 145839DG 51VC1600 145839DD
33VC650 145839DL 32VC1000 145839DE 51VC1600 145839DD 32VC1000 145839DE 60VC1600 145839DU
37VC650 145839DM 38VC1200 145839DB 60VC1600 145839DU 38VC1200 145839DB 66VC1600 145839DW
42VC650 145839DN 42VC1200 145839DA 76VC1600 145839EJ
- - - - 76VC2000 145839EL

VC5001 IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1 27

Airflex model VC Grinding mill clutches

7.7 Friction block and rivet kits

Narrow series Wide series

Qty friction Qty friction
Element size Kit no. blocks Qty.**rivets Element size Kit no. blocks Qty.**rivets
11.5VC500 146236AA 8 54 14VC1000 146237AA 16 102
14VC500 146236AB 8 90 16VC1000 146237AB 8 90
16VC600 146236AC 8 90 20VC1000 146237AC 8 90
20VC600 146236AD 10 110 24VC1000 146237AD 10 110
24VC650 146236AE 12 130 28VC1000 146237AE 10 110
28VC650 146236AF 14 150 32VC1000 146237AF 12 130*
33VC650 146236AG 16 170 38VC1200 146237AG 12 130*
35VC650 146236AH 18 190 42VC1200 146237AH 14 150*
37VC650 146236AJ 18 190 46VC1200 146237AJ 32 198*
42VC650 146236AK 20 210 52VC1200 146237AK 36 222*
* Fasteners for these sizes are screws and nuts - all other sizes 51VC1600 146237AL 36 222*
use rivets. 60VC1600 146237AM 40 246*
** Extra fasteners supplied with each kit.
66VC1600 146237AN 44 270*
76VC1600 146237AR 50 306*
76VC2000 146237AW 50 416*

7.8 Friction shoe assembly, torque bar and release spring kits

Narrow series Wide series

Qty Qty
Element friction torque Qty Element Qty friction Qty torque
size Kit no. blocks bars springs size Kit no. blocks bars Qty springs
11.5VC500 146236A 8 8 8 14VC1000 146237A 8 8 8
14VC500 146236B 8 8 8 16VC1000 146237B 8 8 8
16VC600 146236C 8 8 8 20VC1000 146237C 8 8 8
20VC600 146236D 10 10 10 24VC1000 146237D 10 10 10
24VC650 146236E 12 12 12 28VC1000 146237E 10 10 10
28VC650 146236F 14 14 14 32VC1000 146237F 12 12 12
33VC650 146236G 16 16 16 38VC1200 146237G 12 12 12
35VC650 146236H 18 18 18 42VC1200 146237H 14 14 14
37VC650 146236J 18 18 18 46VC1200 146237J 16 16 16
42VC650 146236K 20 20 20 52VC1200 146237K 18 18 18
51VC1600 146237L 18 18 36
60VC1600 146237M 20 20 40
66VC1600 146237N 22 22 44
76VC1600 146237V 25 25 50
76VC2000 146237W 25 25 25

28 VC5001 IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1

 Airflex model VC Grinding mill clutches

8.0 Revision

Original publication date : March, 2010

Revision date Change Page(s)
November 2006 Added 76vc1600 revision Various
Update cover to current standards Cover
Adjusted copyright date All
Added call-out (7) "friction shoe assembly" to figure 1 1
Added dw76vc2000 to table 1 6
Added sw76vc1600 to table 2 7
Added sw76vc2000 to table 2 7
Added dw76vc2000 to table 2 7
Added 76vc1600 to table 3 11
Added 76vc2000 to table 3 11
Removed the word (continued) from table 4 16
Added 76vc2000 to table 5 18
Changed maximum rpm of 76vc1600 from 480 to 275 in table 5 18
Changed element size from 51 thru 76vc1600 to thru 76vc2000 in table 6 20

March 2010 Changed element size 76vc1600 to 76vc2000 in table 7 21

Added 76vc1600 and 76vc2000 to table 8 23
Corrected 2vc1000 to 20vc1000 in figure 14 23
Corrected 20vc800 to 20vc600 in table 8 23
Corrected internet address 25
Changed part # 301906 to #301908 in section 7.3 28
Added 76vc2000 to section 7.3 28
Added 76vc2000 to section 7.4 29
Added 76vc2000 to section 7.5 29
Added 76vc2000 to section 7.6 30
Added 76vc2000 to section 7.7 30
Added 76vc2000 to section 7.8 31
Added section 8.0 Revisions 32
Updated warranty page Last

February 2012 Copyright & revision year changed All

Air piping diagram changed in figure 9 13
Table description changed 13

December 2017 Corrected tolerance value in section 2.3.1 and section 2.4 10
Corrected item #1 part # 510829 to #510629 in section 7.3 25
Corrected item #1 part # 506874 to #506674 in section 7.3 25
Corrected item #12 part # 304214 to #308639 in section 7.3 25
Corrected item #11 qty from 1 to 2 in section 7.3 25
Corrected 66VC1600 Dual element part # 142198C to #142198P in section 7.4
26
Added part number & Mar Com part number on cover page 26
Updated manual to current format

VC5001 IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1 29

Airflex model VC Grinding mill clutches

Notes

30 VC5001 IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1

 Airflex model VC Grinding mill clutches

Notes

VC5001 IOM OF AIRFLEX MODEL VC GRINDING MILL CLUTCHES E-CLCL-TH001-E1 31

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• PLUS+1® controllers
• PLUS+1® displays
• PLUS+1® joysticks and
pedals
• PLUS+1® operator
interfaces
• PLUS+1® sensors
• PLUS+1® software
• PLUS+1® software services,
support and training
• Position controls and
sensors
• PVG proportional valves
• Steering components and
systems
• Telematics Local address:

Hydro-Gear
www.hydro-gear.com
Daikin-Sauer-Danfoss
www.daikin-sauer-danfoss.com

Danfoss
Power Solutions Trading
Danfoss Danfoss Danfoss (Shanghai) Co., Ltd.
Power Solutions (US) Company Power Solutions GmbH & Co. OHG Power Solutions ApS Building #22, No. 1000 Jin Hai Rd
2800 East 13th Street Krokamp 35 Nordborgvej 81 Jin Qiao, Pudong New District
Ames, IA 50010, USA D-24539 Neumünster, Germany DK-6430 Nordborg, Denmark Shanghai, China 201206
Phone: +1 515 239 6000 Phone: +49 4321 871 0 Phone: +45 7488 2222 Phone: +86 21 2080 6201

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agreed.
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© Danfoss | September 2022