Installation and Service Instructions

GlobalGear® Series Pumps

V 2.1 Excellence at work. Excellence in life.

Table of Contents
Introduction 3
General Description 3
Modular Design 3
GlobalGear® Models 4
GlobalGear® Model Number System 5
Installation 6
Simple Efficiency Improvement 7
Packing Adjustment 7
Lubrication Requirements 7
Parts Interchangeability 8
Inspection / Repair 9
Pump Disassembly - Partial 9
Drive Module Removal 10
Drive Module Installation 11
Install New Cover and Idler Gear 11
In-Line Seal / Packing Replacement 12
Pump - Complete Disassembly Procedure 15
Pump - Complete Assembly Procedure 17
Rebuild Drive Module Assembly 21
Adjustment of End Clearance  22
Safety Relief Valve Instructions 23
GlobalGear® Materials of Construction 25
GlobalGear® Temperature Limits 26
Troubleshooting 27
Material Returns 28
Warranty 28
Contact Information 28

V 2.1 Page 2 of 28
Introduction
The GG Series pumps have been certified to the requirements of the ATEX Directive 94/9/EC for use in Category II, Group 2 G applications.
Read this manual before operating or working on the GG Series pumps. If additional information is required to facilitate operation or
maintenance, contact the authorized Tuthill distributor shown at the back of this service manual. GG Series pumps have been designed
and manufactured to provide years of service under normal operating conditions. Illustrations used in this manual are for reference
purposes only. Consult the factory or an authorized Tuthill distributor for proper part identification. When ordering replacement parts,
provide as much detail as possible to ensure correct parts are provided. Details should include the full model number (18 digits), serial
number, name of part, part number (if known) and part material.

General Description
The GG Series pumps use the internal gear design pumping principle (see Figure 1) to perform the positive-displacement pumping
action desired. Thus, the pump has only two moving parts, the rotor and the idler gear.

Figure 1 – Internal Gear Pumping Principle

Pumping action is based on a rotor, idler gear and crescent-shaped partition cast integral with the cover. Power applied to the rotor is
transmitted to the idler gear with which it meshes. The space between the outside diameter of the idler and the inside diameter of the
rotor is sealed by the crescent. As the pump starts, the teeth come out of mesh, increasing the volume. This creates a partial vacuum,
drawing the liquid into the pump through the suction port. The liquid fills the spaces between the teeth of the idler and the rotor and
is carried past the crescent partition through the pressure side of the pump. When the teeth mesh on the pressure side, the liquid
is forced from the spaces and out through the discharge port. The materials furnished for each pump are selected to suit individual
applications.

Modular Design
The GG Series of pumps have a Modular Design concept. This allows for simplified maintenance of the pump and a broad range of
flexibility on the design. For more information, consult the GG Series Catalog or your authorized Tuthill distributor. The GG Series of
pumps allows for simplified repairs:
• Back Pullout—This allows the Drive Module (rotor/bracket/bearing carrier/bearing caps assembly) to be removed from
the pump housing without disturbing the piping attachments. This requires the use of a spacer coupling.
• In-Line Seal Replacement—This allows for the replacement of the seals/packings without completely disassembling the
pump.
The GG series of pumps in the GG250 and smaller sizes have bolt-on ports when furnished with a housing with a 90°-porting
arrangement. This allows a broad range of flexibility for porting options in both size and configuration. The GG550 has ports cast integral
with the housing. 90° housings can be rotated when assembled to add even more porting flexibility.

V 2.1 Page 3 of 28
GlobalGear® Models

Max Capacity Max Pressure Weight

Material Size MaxSpeed
USGPM LPM PSI BAR LB KG
GG015 1800 15 57 200 13.8 50 22.7
GG030 1800 30 114 200 13.8 50 22.7
GG050 1500 50 189 75 5.0 110 49.9
GG070 1500 70 265 75 5.0 110 49.9
GG080 1500 80 303 75 5.0 110 49.9
Cast Iron

GG090 1500 90 341 75 5.0 110 49.9

GG120 1200 120 454 200 13.8 175 78.1
GG130 1000 130 492 200 13.8 175 78.1
GG200 1000 200 757 200 13.8 260 116.0
GG210 800 210 795 200 13.8 260 116.0
GG250 640 200 946 200 13.8 280 125.0
GG550 500 550 2081 150 10.3 700 318.2
GG015 1200 10 38 150 10.3 50 22.7
GG030 1200 20 75 150 10.3 50 22.7
Stainless Steel

GG080 1000 40 151 150 10.3 110 49.9

GG130 640 86 325 150 10.3 175 78.1
GG210 520 140 530 150 10.3 260 116.0
GG250 520 160 632 100 6.9 260 125.0
GG550 350 350 1325 125 8.6 700 318.2
GG015 1800 15 57 200 13.8 50 22.7
GG030 1800 30 114 200 13.8 50 22.7
Cast Steel

GG130 1000 100 379 200 13.8 175 78.1

GG250 640 200 757 200 13.8 280 125.0
GG550 500 550 2082 200 13.8 700 318.2
Table 1 – GlobalGear® Models

* Where available, cast steel has the same performance characteristics as its equivalent sized iron pump.

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GlobalGear® Model Number System
For Special Pumps with a Feature not Described Below
Sequential
Pump Series Pump Size Material Port Position Special Indicator Year of Design
Special Number
GG 210 I A -X 01 56

Shaft Dimensions
Port Position &
Construction

Sealing Type
Pump Series

Bushing Pin
Relief Valve
Material of

Clearances
Pump Size

Seal Flush

Port Type

Tutriding
Port Size
Rotation

Method
Sealing

Jackets
G G 2 1 0 I A V M A 1 A K I A 0 0 0
Position 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Pos. 1 & 2 - Pump Series Pos. 9 - Sealing Method Pos. 14 - Shaft Dimensions
GG = complete pump P = packing I = Inch seal & coupling
GD = drive module I = IB mechanical seal (behind rotor)
M = OB mechanical seal (in stuffing box) Pos. 15 - Bushings & Pin
Pos. 3, 4, & 5 - Pump Size C = cartridge mechanical seal A = bronze idler & bracket
015 = nominal 15 GPM at 1800 RPM C = carbon idler, bronze bracket
030 = nominal 30 GPM at 1800 RPM Pos. 10 - Seal Type D = carbon idler & bracket
050 = nominal 50 GPM at 1500 RPM 0 = no gland or packing E = hi-temp carbon idler & bracket
070 = nominal 70 GPM at 1500 RPM A = standard packing (graphite/PTFE)** G = T.C. idler with T.C. pin, bronze bracket
080 = nominal 80 GPM at 1500 RPM B = NI Resistant Type 2 Mechanical Seal I = T.C. idler & bracket with T.C. pin & hardened
090 = nominal 90 GPM at 1500 RPM C = food-grade packing (pure PTFE) shaft
120 = nominal 120 GPM at 1200 RPM E = Viton mechanical seal
130 = nominal 130 GPM at 1000 RPM F = PTFE mechanical seal Pos. 16 - Tutriding
200 = nominal 200 GPM at 1000 RPM H = abrasion-resistant mech. seal (Viton) 0 = none
210 = nominal 210 GPM at 800 RPM L = gen. purp. single cartridge seal (<7,500 SSU) 1 = Tutrided rotor head, idler, cover
250 = nominal 200 GPM at 640 RPM M = hard face cartridge seal 2 = Tutrided rotor head, idler, cover, housing
550 = nominal 550 GPM at 500 RPM N = process single cartridge seal (<75,000 SSU)
Q = Heavy Duty Slurry (Viton)
Pos. 17 - Jackets
Pos. 6 - Material of Construction R = Heavy Duty Slurry (Chemraz)
0 = none
I = iron T = TuffSeal cartridge lip seal (Viton O-rings)
1 = cover only
S = stainless steel K = Triple Lip - PMF PTFE - Viton
2 = bracket only
C = cast steel P = Hard Faces Cartridge Single Mech. Seal
3 = cover and bracket
(Tungsten Carbide/Silicar - Viton) Quench Drain
Pos. 7 - Port Position & Rotation Pos. 18 - Clearances
Pos. 11 - Seal Flush 0 = standard <7,500 SSU, -100° to 200°F
0 = none
A = 7,500 to 75,000 SSU 200° to 300°F
1 = internal vent to suction (Plan 13)
B = 75,000 to 750,000 SSU
G = <7,500 SSU 300°F to 450°F (see note)
Pos. 12 - Port Type H = 450°F to 550°F (see note)
A-ROTATION B-ROTATION C-ROTATION 0 = none J = Chocolate Clearance Mods (Include Class B
A = FNPT Clearance, Bronze Bushings, Root Drilled Idler &
C = ANSI 125# flanged (C.I. only) Drilled Rotor Head.)
D = ANSI 150# flanged
E = ANSI 250# flanged (C.I. only) Note: Pumps with G or H in this position
D-ROTATION E-ROTATION F-ROTATION F = ANSI 300# flanged include hi-temp package
(paint, bearing & gaskets)
Pos. 8 - Relief Valve Pos. 13 - Port Size
0 = none 0 = none Legend
V = internal H = 1-1/2” or 40mm n = NOT AVAILABLE ON ALL SIZES
I = 2” or 50mm C.I. = Cast Iron
J = 2-1/2” or 65mm T.C. = Tungsten Carbide
K = 3” or 80mm
L = 4” or 100mm
N = 6” or 150mm
V 2.1 Page 5 of 28
 WARNING!
Failure to follow these instructions could result in serious bodily injury or death. Do not attempt to work on any Tuthill pump installation
before completing the steps below. Disconnect the drive so that it cannot be started while work is being performed. Review the Material
Safety Data Sheet (MSDS) applicable to the liquid being pumped to determine its characteristics and the precautions necessary to
ensure safe handling. Vent all pressure within the pump through the suction or discharge lines. All Tuthill pumps contain residual
hydraulic oil from the factory production test. Determine if this is compatible with the fluid you are pumping. If the fluid is incompatible,
then the pump must be fully flushed prior to use. If the pump is to be operated at elevated temperatures, the pump should be brought
up to operating temperatures gradually. Rapid or sudden introduction of liquids at elevated temperatures into the cold liquid chamber
of the pump could cause damage to pump externals, seals or other internal parts. Do not run the pump dry. Failure to comply
with this could cause severe damage to the internal seal, bushings and/or metal parts. Pump needs to be Earthed separately to avoid
build up of Electro-Static Charge.

Installation
For optimum pump performance the suction line must be at least as large as the corresponding pump port. It should be as short as
possible in order to avoid excessive pressure drops and must be airtight. Locate the pump as close to the source of supply as conditions
permit and if possible, below the level of the liquid in the reservoir. When necessary to locate the pump in a pit, provisions should be
made to safeguard against flooding.
When handling high viscosity liquids, the speed of the pump must be reduced and the size of the inlet lines increased to prevent
cavitation. Refer to the NPSHr data for the pump. The GlobalGear® series of pumps (GG250 and smaller) provides an orifice vent to
the seal chamber in the bracket from one of the housing’s ports (typically the suction port). On applications where the viscosity is 7,500
SSU or greater, the orifice plug should be removed so there is no restriction on the vent hole. Pumps should be filled with liquid at
installation and should never be allowed to run dry. The placement of a strainer on the suction side of the pump will restrict any solids
or abrasives from entering the pump, which could cause internal damage.
Under no conditions should the pump be used to support external piping loads (weight or expansion). Piping and other equipment
should be independently supported. Piping strain can result in misalignment, hot bearings, worn couplings, vibration, etc. It is important
that the piping used be clean and free of chips and scales. The discharge line must be designed with the maximum pressure rating
of the pump in mind. Excessive pressure could cause damage to your motor and/or pump. If a pressure relief valve has not been
supplied with the pump, some other means of pressure protection must be utilized. This could include in-line safety valves, pressure
shutdown switches or other similar devices.
Pumps shipped from the factory with relief valves have the relief valve set at full bypass at the factory on 150 SSU oil at our factory
production test speeds. Field adjustments will be required to meet the actual application requirements. Refer to adjustment instructions
on Page 32. Pumps shipped from the factory with relief valves are assembled for clockwise or counterclockwise rotation as originally
specified. If you want to change rotation, the relief valve assembly must be removed and turned 180 degrees. The adjusting screw
must always point toward the suction line.
Every pump installation should have a good foundation. Its structure should be sufficiently strong to hold the pump rigid and to absorb
any strain or shock that may be encountered. The installation should be leveled, checked for proper piping alignment, and then
fastened securely. The alignment should be rechecked after the pump’s temperature has reached its operating temperature.
Direct drive through a traditional flexible coupling is recommended. However, do not expect the coupling to compensate for misalignment.
Contact the coupling manufacturer to determine the maximum amount of misalignment that the coupling can be subjected to. Never
operate the pumps without all the guards in place. Pumps operating with bi-directional rotation must have pressure relief devices
installed on both sides of the pump. Prior to energizing the pump driver, the pump shaft should be rotated by hand to be sure that
it turns freely. Tag-out, lock-out safety procedures should be followed carefully to be sure that the pump driver cannot be energized
during a hand rotation test.

V 2.1 Page 6 of 28
Simple Efficiency Improvement
The efficiency of the pump may decrease after considerable use as a result of wear. If performance deteriorates below acceptable
levels, it may be moderately improved by reducing the end clearance between rotating elements. Refer to the appropriate reassembly
instructions to accomplish this task. If this doesn’t improve performance to an acceptable level, then more repair work may be necessary.

Packing Adjustment
WARNING!
Packing is designed to leak. Therefore, when pumping hazardous liquids, a mechanical seal is recommended to minimize any potential
source of leakage that could result in a hazardous condition.
Pumps with packing will require periodic adjustment. To accomplish this, gently & evenly tighten packing gland nuts, which will further
compress the packing. Do not over-tighten. Packing is designed to keep leakage to a slight weep. Normally 2-3 drops per minute is
acceptable. If excessive leakage persists after complete adjustment, consider re-packing the stuffing box or using another packing type.

Lubrication Requirements
Outer Bearing

The standard outer bearings are maintenance free. They are greased and sealed by the manufacturer. Optional high-temperature outer
bearings must be re-lubricated at least every 2000 hours or 18 0 days. Bearings are designed to provide a minimum L10 life of 15,000
hours at maximum speed and pressure conditions.

Bracket Bushing

Bracket bushings that do not have grease fittings are fully lubricated by the pumped fluid and are maintenance free. Bracket bushings
that are provided with grease fittings must be re-lubricated at least every 500 hours or 60 days.

Idler Bushing

Idler bushings that are used with standard solid idler pins are fully lubricated by the pumped fluid and are maintenance free. Idler
bushings that are used with optional greasable idler pins must be re-lubricated at least every 500 hours or 60 days.

Recommended Temperature Range

Minimum Maximum
Description Manufacturer Grade °F °C °F °C
Lubriplate 1200-2 -25 -32 350 177
Standard Grease
Mobile Mobilith AW 2 -25 .32 350 177
High Temp. Grease Lubriplate High-Temp 40 4 500 260
Lubriplate Mag-1 -60 -51 200 93
Low Temp. Grease
Mobile Mobiletemp SHC 32 -60 -51 200 93
Lubriplate FGL-2 10 -12 350 177
Food Grade Grease
Mobile Mobilgrease FM 102 10 -12 350 177
Table 2 – Recommended Lubricants

Note: This lubrication data is only intended as a guide. Some applications may have different lubrication requirements depending
on actual conditions.

V 2.1 Page 7 of 28
Parts Interchangeability

PORTS
BEARING CARRIER BRACKET BUSHING

RELIEF VALVE
ASSEMBLY
BEARING CAPS

IDLER
PIN

ROTOR/SHAFT IDLER
ASSEMBLY BUSHING

BALL BEARING

SEAL GLAND IDLER

GEAR

BRACKET HOUSING COVER

SEAL
FOOT ASSEMBLY
Figure 2

Part Name Pump Size

GG015 GG030 GG050 GG070 GG080 GG090 GG120 GG130 GG200 GG210 GG250 GG550
Housing *

Parts *

Relief Valve *

Assembyl
Bracket/Bushing *

Assembly
Bracket Bushing *

Cover/Pin Assembly * * * * * * * * * * * *

Rotor Shaft/ * * * * * * * * * * * *

Assembly
Idler/Bushing * * * * * * * * * * * *

Assemebly
Mechanical Seal or *

Packing
Glands *

Bearing Carrier *

Inner Bearing *

Outer Bearing Cap *

Ball Bearing *

Foot *

Note: Pumps with 180° ports have housings with a cast integral foot. These do not include a separate foot. * unique part for that size

V 2.1 Page 8 of 28
Inspection / Repair
Should it be necessary to remove the pump from service for periodic inspection of components and/or a major repair, the following
steps should be taken.
WARNING!
Failure to follow these instructions could result in serious bodily injury or death. Do not attempt to work on any Tuthill pump installation
before completing the steps below. Only authorized personnel who are familiar with the repair of mechanical products should perform
the necessary repair work. You must familiarize yourself with the entire contents of this manual prior to performing any work Disconnect
the drive so that it cannot be started while work is being performed. Review the Material Safety Data Sheet (MSDS) applicable to the
liquid being pumped to determine its characteristics and the precautions necessary to ensure safe handling. Vent all pressure within
the pump through the suction or discharge lines. Ensure that the pump has cooled to a safe temperature prior to performing any work
on the pump.

Pump Disassembly - Partial

The GG Series of pumps provides the ability to rebuild the internal pumping components of the pump without removing the pump
housing from the base plate. This is accomplished by removing the cover and idler gear from the front end of the pump and the drive
module from the shaft end of the pump.

Remove the Cover and Idler Gear

WARNING!
When removing the cover, the idler gear will generally stay on the pin. Avoid tilting the cover downward as the idler may slide off
causing injury or damage.
Note: On pumps with relief valves on the cover, the cover can be removed with the relief valve still mounted onto the cover.
If necessary, remove safety relief valve: If the pump has a safety relief valve mounted on it, remove it by loosening the bolts that mount
it to the cover or housing. Prior to removing the cover, the general position should be marked in relationship to the housing. Once done,
remove the cover bolts and the cover.

Remove the Cover Gasket

If a new gasket is not available, re-use of the original gasket is acceptable, provided it is not torn or otherwise damaged.

Remove the Idler from the Pin

With the idler gear still on the cover, check for excessive wear between:
• The pin and bushing
• The idler and cover crescent
• Idler width and crescent height
Any visible signs of excessive wear will require replacement of the cover/pin assembly and/or the idler and the bushing.
If only the bushing shows signs of minor wear, it should be replaced. Acceptable bushing clearances are shown in Table 3 (for pumps
with standard clearance only).

V 2.1 Page 9 of 28
 Acceptable Clearance
Pump Size Inch mm
GG015 0.001 - 0.007 0.038 - 0.178
GG030 0.001 - 0.007 0.038 - 0.178
GG050 0.002 - 0.008 0.051 - 0.203
GG070 0.002 - 0.008 0.051 - 0.203
GG080 0.002 - 0.008 0.051 - 0.203
GG090 0.002 - 0.008 0.051 - 0.203
GG120 0.002 - 0.009 0.064 - 0.229
GG130 0.002 - 0.009 0.064 - 0.229
GG200 0.003 - 0.009 0.089 - 0.229
GG210 0.003 - 0.009 0.089 - 0.229
GG250 0.003 - 0.009 0.089 - 0.229
GG550 0.005 - 0.012 0.127 - 0.305
Table 3 - Idler Bushing Clearances

Note: Many Tuthill pumps are provided with non-standard clearances for use with high-viscosity or high-temperature fluids. Consult
the factory for clearances of these pumps.

Drive Module Removal

Remove the drive module assembly from housing

If service is being completed with the housing still mounted to the base plate/piping, you must first remove the spacer from the spacer
coupling.
Adequately support the housing (on the cover side) so it will not fall.
Remove the bolts that hold the bracket to the
housing.
On pumps that do not have a cast integral
foot, remove the bolts that attach the foot to
the bearing carrier.
The drive module assembly can then be pulled
from the housing as a single unit (Figure 3).
Caution should be used, as the drive modules
can be heavy. The use of a lifting device may
be required.

Figure 3 - Back Pullout

V 2.1 Page 10 of 28
Drive Module Installation
Place the gasket on the bracket.
Note: The standard bracket for the GlobalGear pumps provides a vent to the seal chamber from the suction port of the housing (see
Figure 4). Position the bracket so the vent hole lines up with the hole in the housing by the suction port. See Table 4 for proper torque
specifications.
The orifice plug should be removed from the GG250 and smaller pumps if the viscosity of the application is greater than 7500 SSU
(1650 CST).

Suction Port

Internal Flush Holes

1/4" NPT Plugs
Orifice

Figure 4 – Internal Seal Vent

Slide the drive module into the housing and assemble with bolts that attach the bracket to the housing.

Install New Cover and Idler Gear

See Table 4 for proper torque specifications. Place idler assembly on cover once the idler is on the cover, ensure that it rotates freely.

Install Cover and Idler Assembly

Place the gasket on the cover. Tilt the top of the cover away from the pump until the crescent can be fitted into the rotor I.D. then rotate
the idler until its teeth mesh with the rotor teeth. Assemble with cover bolts.
If required, install relief valve to the housing or cover. Prior to reinstalling the relief valve back onto the pump housing or cover, ensure
that the valve is clear of any foreign material and that the flow ports are unobstructed. Place the valve gasket on the housing or cover.
Assemble the valve on the pump housing or cover with valve screws. Make certain the adjusting screw of the valve points towards the
suction port.

V 2.1 Page 11 of 28
 CAUTION!
The adjusting screw of the valve must point towards the suction port. The end clearances can now be set. Refer to instructions on Page
32.

Fastener Size Foot - Pounds Newton - Meters

M6 6-9 8 - 12
M8 14 - 21 19 - 28
M10 30 - 40 41 - 54
M 12 55 - 65 75 - 88
Table 4a – Fastener torque requirements

Refit Coupling and Guard

If you have been able to take advantage of the modular design of this pump, the complete overhaul has been accomplished without
removal of the housing from the base plate or piping. Thus, your original coupling alignment should be intact.
Refit the coupling and spacer, double-check alignment and complete any final adjustments.

In-Line Seal / Packing Replacement

WARNING!
Failure to follow these instructions could result in serious bodily injury or death. Do not attempt to work on any Tuthill pump installation
before completing the steps below. Only authorized personnel who are familiar with the repair of mechanical products should perform
the necessary repair work. You must familiarize yourself with the entire contents of this manual prior to performing any work Disconnect
the drive so that it cannot be started while work is being performed. Review the Material Safety Data Sheet (MSDS) applicable to the
liquid being pumped to determine its characteristics and the precautions necessary to ensure safe handling.
Vent all pressure within the pump through the suction or discharge lines. Ensure that the pump has cooled to a safe temperature
prior to performing any work on the pump. The seals and packing’s on the GG Series of pumps can be replaced without a complete
disassembly of the pump.
Note: See Table 4 for proper torque specifications.

Remove the Ball Bearing Assembly

• Remove the bearing lock washer and locknut
• Remove the outer bearing cap hex head bolts
• Remove the bearing/bearing cap assembly
Note: If dirt or rust has gotten between the bearing carrier and the bearing cap, then the bearing/bearing cap assembly may be
difficult to remove.

Remove the Seal or Packing

• Remove the gland nuts and washers
• Remove the gland
• Remove the packing

V 2.1 Page 12 of 28
 Packing
Gland

Bearing Lock Washer/Locknut

Ball Bearing Assembly Stud/Nut/Washer

Figure 6 – Pump with Packing

Pumps with single seal behind the bushing (Out-Board location –see Figure 10). Remove the gland nuts and washers. Remove the
gland and gland gasket. Remove the seal head from the shaft. Remove the seal seat from the gland. Remove the out-board seal collar.
Remove the pin from the shaft. To do this, remove the plug in the 1/2” NPT hole in the bracket. Using a needle nose pliers (or similar
tool), remove the locating pin from the hole in the shaft. Pumps with cartridge seal consult the separate seal instructions provided by
the seal manufacturer.

Install Packing or Seal

Pumps with packing Install and seat each ring into the bracket stuffing box and stagger cut joints from one side of the shaft to the other.
Loosely install the gland using the gland studs, nuts and washers. The packing will be adjusted on site. Pumps with single seal behind
the bushing (Out-Board location - See Figure 10)
It is always recommended to replace the rotor if
scoring is present on the shaft. If the old one is
being re-used, lightly polish the shaft in order to
remove minor defects.
• Install the locating collar (see Figure 7)
• Using a needle nose pliers (or similar tool),
install the locating pin by inserting it through
the hole in the bracket into the hole in the
shaft
• Position the collar so the side with the slot
for the locating pin is towards the housing
• Slide the collar over the shaft until it engages
with the locating pin
• Install the stationary seat into the gland
• Lightly lubricate the O-ring on the stationary
seat and then press the seat into the gland.
If the gland has an anti-rotation pin, make
sure the pin is aligned with the slot in the seal seat

V 2.1 Page 13 of 28
 Bracket

Gland O-ring

Gland Locating Collar

Locating Pin

Figure 7
Stationary Seat Seat O-ring Shaft
CAUTION!
The highly polished seal faces should not be touched during the assembly process, as any minor scratch could result in leakage once
in service.
• Install the mechanical seal onto the shaft.
• Lightly polish the shaft in order to remove any minor defects.
• Place the seal head on the rotor shaft. A light lubricant will assist. Proper location of the seal is with the back portion against
the collar. If the seal head has setscrews, tighten them once the seal head is properly located. Plug the access holes when
finished with the ½ “ NPT plug.
• Install the gland
• Slide the gland O-ring and gland over the shaft and position it onto the studs on the bracket. Install the washers and nuts
and tighten.
Pumps with cartridge seal consult the separate seal instructions provided with the new seal.
Install Ball Bearing Assembly
Place the inner bearing cap over the shaft. Install the new ball bearing onto the shaft. The bearing may have a slight press on the shaft
so the bearing may have to be tapped on. Ensure that it bottoms out on the shaft shoulder. The bearing must be pressed on the inner
race, not the outer race. Pressing on the outer race could damage the bearing.
CAUTION!
Do not use excessive force when pressing the bearing onto the pump shaft, as it could damage the mechanical seal.
Install the bearing lock washer and locknut. After the locknut is tightened, bend one of the lock washer tabs into the locknut slot to
ensure that the locknut cannot vibrate loose. Loosely fit the inner and outer bearing caps to the bearing carrier using the bearing cap
screws. DO NOT tighten the bolts at this time.
The end clearances can now be set. Refer to instructions on Page 22.

V 2.1 Page 14 of 28
Refit Coupling and Guard

If you have been able to take advantage of the modular design of this pump, the complete overhaul has been accomplished without
removal of the housing from the base plate or piping. Thus, your original coupling alignment should be intact.
Refit the coupling and spacer, double-check alignment and complete any final adjustments.

Pump - Complete Disassembly Procedure

WARNING!
Failure to follow these instructions could result in serious bodily injury or death. Do not attempt to work on any Tuthill pump installation
before completing the steps below. Only authorized personnel who are familiar with the repair of mechanical products should perform
the necessary repair work. You must familiarize yourself with the entire contents of this manual prior to performing any work
Disconnect the drive so that it cannot be started while work is being performed. Review the Material Safety Data Sheet (MSDS) applicable
to the liquid being pumped to determine its characteristics and the precautions necessary to ensure safe handling.
Vent all pressure within the pump through the suction or discharge lines. Ensure that the pump has cooled a safe temperature prior
to performing any work on the pump.

Remove the Pump from the Base

The pump can be removed from the base for service or it can be disassembled without disturbing the housing, provided a spacer
coupling was originally installed. If necessary, remove safety relief valve. If the pump has a safety relief valve mounted on it, remove it
by loosening the bolts that mount it to the cover or housing.

Remove Pump Cover

On pumps with relief valves on the cover, the cover can be removed with the relief valve still mounted onto the cover. Prior to removing
the cover, the general position should be marked in relationship to the housing. Once done, remove the cover bolts and the cover.
CAUTION!
When removing the cover, the idler gear will generally stay on the pin. Avoid tilting the cover downward as the idler may slide off
causing injury or damage. Remove the cover gasket and if a new gasket is not available, re-use of the original gasket is acceptable,
provided it is not torn or otherwise damaged.

Remove the Idler from the Pin

With the idler gear still on the cover, check for excessive wear between:
• The pin and bushing
• The idler and cover crescent
• Idler width and crescent height
Any visible signs of excessive wear will require replacement of the cover/pin assembly and/or the idler and the bushing.
If only the bushing shows signs of minor wear, it should be replaced. Acceptable bushing clearances are shown in Table 3 (for pumps
with standard clearance only).
Note: Many Tuthill pumps are provided with non-standard clearances for use with high-viscosity or high-temperature fluids. Consult
the factory for clearances of these pumps.

V 2.1 Page 15 of 28
Remove the Drive Module Assembly from Housing

If service is being completed with the housing still mounted to the base plate/piping, you must first remove the spacer from the spacer
coupling.
Adequately support the housing (on the cover side) so it will not fall.
Remove the bolts that hold the bracket to the housing.
On pumps that do not have a cast integral foot, remove the bolts that attach the foot to the bearing carrier.
The drive module assembly can then be pulled from the housing as a single unit. Caution should be used, as the drive modules can be
heavy. The use of a lifting device may be required.

Remove the Ball Bearing Assembly

• Remove the bearing lock washer and locknut
• Remove the outer bearing cap hex head bolts
• Remove the bearing/bearing caps assembly
• Remove the three bolts that hold the inner bearing cap in place and remove the inner bearing cap
• Remove the outer bearing cap
• Remove the bearing from the shaft
• There may be a slight press-fit between the shaft and bearing
• Use a bearing puller or other appropriate tool if required
Note: If dirt or rust has gotten between the bearing carrier and the bearing cap, then the bearing/bearing cap assembly may be
difficult to remove.

Remove the Seal or Packing

For pumps with packing.

• Remove the gland nuts and washers
• Remove the gland and packing
• The rotor and bracket can now be separated
Pumps with single seal behind the rotor (In-Board Location - see Figure 9).
• Remove the bracket
• Remove the seal head from the shaft, directly behind the rotor head
• Remove the in-board seal gland from inside the bracket
• Remove the seal seat from the in-board seal gland
Pumps with single seal behind the bushing (Out-Board Location - see Figure 10).
• Remove the gland nuts and washer, gland, and gland gasket
• Remove the seal head from the shaft and seal seat from the gland
• Remove the out-board seal collar
• Remove the pin from the shaft. To do this, remove the plug in the ½” NPT hole in the bracket
• Using a needle nose pliers (or similar tool), remove the locating pin from the hole in the shaft
• The rotor and bracket can now be separated
Pumps with cartridge seal consult the separate seal instructions provided by the seal manufacturer.

V 2.1 Page 16 of 28
Clean and Inspect

Clean all parts and inspect for signs of excessive wear or scoring and replace if necessary. Any signs of excessive wear between the
bracket bushing and shaft may also cause housing wear. This should be checked. If only the bracket bushing shows signs of minor wear
it should be replaced. Acceptable bushing clearances are shown in Table 5 (for pumps with standard clearance only).

Acceptable Clearance
Pump Size Inch mm
GG015 0.001 - 0.005 0.025 - 0.127
GG030 0.001 - 0.005 0.025 - 0.127
GG050 0.001 - 0.006 0.025 - 0.152
GG070 0.001 - 0.006 0.025 - 0.152
GG080 0.001 - 0.006 0.025 - 0.152
GG090 0.001 - 0.006 0.025 - 0.152
GG120 0.003 - 0.008 0.076 - 0.203
GG130 0.003 - 0.008 0.076 - 0.203
GG200 0.003 - 0.008 0.076 - 0.203
GG210 0.003 - 0.008 0.076 - 0.203
GG250 0.003 - 0.008 0.076 - 0.203
GG550 0.0045 - 0.010 0.114 - 0.254
Table 5 - Bracket Bushing Clearances

Note: Many Tuthill pumps are provided with non-standard clearances for use with high-viscosity or high-temperature fluids. Consult
the factory for clearances of these pumps. Tuthill quality replacement parts are available through your authorized Tuthill distributor.
Use of parts not manufactured by Tuthill may void your warranty.

Pump - Complete Assembly Procedure

See Table 4 for proper torque specifications.Prior to reassembly, ensure that all items are cleaned thoroughly and free of any metal
burrs. Insert new idler bushing (if necessary).

Bronze or Standard Carbon Bushings

Insert the new bushing with the assistance of a hand arbor press. The bushing should be flush to slightly below the face of the idler.
Ensure that the bushing does not protrude beyond the surface of the idler on both faces.
Some sizes of idler gears use two bushings. If this is the case, install a bushing from each side making sure that the bushings do not
protrude beyond the surface of the idler on either face.
CAUTION!
Special care must be taken during the insertion of carbon bushings. Ensure that the bushing diameter and idler bore are parallel, as
any misalignment during insertion may cause cracks. The bushing should be installed using the side of the bushing with the chamfer.
Once insertion starts DO NOT STOP until the bushing is in proper position. Starting and stopping can result in cracked bushings. If an
oven is available, the method described below in section B may also be used.
On idlers that use bronze bushings, there is a hole through the root diameter of one of the teeth. Use this hole to drill a hole through
the bronze bushing. Wear heat-resistant gloves when handling hot components.

V 2.1 Page 17 of 28
Tungsten Carbide or High-Temperature Carbon Bushings

Heat the idler gear evenly to about 400°F (204°C). Set the heated idler gear on a flat surface. Drop the bushing into the idler gear
making certain that the bushing is flush to slightly below the face of the idler. Ensure that the bushing does not protrude beyond the
surface of the idler on both faces. Some sizes of idler gears use two bushings. If this is the case, install a bushing from each side making
sure that the bushings do not protrude beyond the surface of the idler on either face. Allow the idler to air cool to room temperature.

Insert New Bracket Bushing (if necessary)

With bronze or standard carbon bushings insert the new bushing with the assistance of a hand arbor press. Always install the bushing
from the chamfered end of the bracket. On brackets that use bronze bushings, there is a hole through the bracket above the bushing.
Use this hole to drill a hole through the bronze bushing.
CAUTION!
Special care must be taken during the insertion of carbon bushings. Ensure that the bushing diameter and idler bore are parallel, as
any misalignment during insertion may cause cracks. The bushing should be installed using the side of the bushing with the chamfer.
Once insertion starts, DO NOT STOP until the bushing is in proper position. Starting and stopping can result in cracked bushings.

Tungsten Carbide or High-Temperature Carbon Bushings

Heat the bracket evenly to about 400°F (204°C). Set the heated bracket on a flat surface. Use a spacer block to properly locate the
bushing (see Figure 8). Drop the bushing into the bracket. Allow the bracket to air cool to room temperature.
WARNING!
Wear heat-resistant gloves when handling hot components.
BRACKET BUSHING

SPACER

IRON BRACKET S.S. BRACKET

Figure 8 – Bracket Bushings

Install Packing or Seal

For pumps with packing it is always good practice to install new packing during a complete rebuild. New packing sets are available from
an authorized Tuthill distributor. Install and seat each ring into the bracket stuffing box and stagger cut joints from one side of the shaft
to the other. Loosely install the gland, using the gland studs, nuts and washers. The packing will be adjusted on site. Pumps with single
seal behind the rotor (In-Board location) See Figure 9

V 2.1 Page 18 of 28
 BRACKET ACCESS HOLE

LIP SEAL MECHANICAL SEAL

INNER GLAND O-RING

Figure 9 – Single Seal in In-Board Location

It is always recommended to replace the rotor if scoring is present on the shaft. If the old one is being re-used, lightly polish the shaft
in order to remove minor defects.
CAUTION!
The highly polished seal faces should not be touched during the assembly process as any minor scratch could result in leakage once in
service.
Place the seal head on the rotor shaft. A light lubricant will assist. Proper location of the seal is with the back portion against the rotor
head. If the seal head has setscrews, tighten them once the seal head is properly located.
Insert a new O-ring on the OD of the in-board seal gland. Lightly lubricate the O-ring.
Insert the seal seat into the in-board seal gland bore. If the seal needs an anti-rotation pin, make sure the pin is aligned with the slot in
the seal seat. Install the in-board seal gland into the bracket making sure the pin is aligned with the hole in the bracket.
A lip seal is used to keep dirt and contamination away from the bracket bushing grease. If this seal is damaged, it must be replaced.
Always position the lip seal with the lip facing outward. This will allow old grease to be displaced through the lip seal during re-greasing.
Pumps with single seal behind the bushing (Out-Board location) See Figure 10.
NOTE: This must be done after the bracket is mounted onto the housing and the rotor/shaft assembly has been installed.

V 2.1 Page 19 of 28
 BRACKET ACCESS HOLE

GLAND

MECHANICAL SEAL
PIN
COLLAR
Figure 10 – Single Seal in Out-Board Location

It is always recommended to replace the rotor if scoring is present on the shaft. If the old one is being re-used, lightly polish the shaft
in order to remove minor defects.

Install the Locating Collar (see figure 7)

Using a needle nose pliers (or similar tool), install the locating pin by inserting it through the hole in the bracket into the hole in the
shaft. Position the collar so the side with the slot for the locating pin is towards the housing. Slide the collar over the shaft until it engages
with the locating pin.

Install the Stationary Seat into the Gland (see figure 7)

CAUTION!
The highly polished seal faces should not be touched during the assembly process as any minor scratch could result in leakage once in
service.
Lightly lubricate the O-ring on the stationary seat and then press the seat into the gland. If the gland has an anti-rotation pin, make sure
the pin is aligned with the slot in the seal seat.

Install the Mechanical Seal onto the Shaft

Lightly polish the shaft in order to remove any minor defects. Place the seal head on the rotor shaft. A light lubricant will assist. Proper
location of the seal is with the back portion against the collar. If the seal head has setscrews, tighten them once the seal head is properly
located. Plug the access holes when finished with the 1/2“ NPT plug.

V 2.1 Page 20 of 28
 CAUTION!
The highly polished seal faces should not be touched during the assembly process as any minor scratch could result in leakage once in
service.
To install the gland slide the gland o-ring and gland over the shaft and position it onto the studs on the bracket. Then install the washers
and nuts and tighten.

Flush Arrangements (See Figure 4)

The orifice plug should be removed on GG250 pumps and smaller if the viscosity of the application is greater than 7500 SSU (1650 CST).
For pumps with cartridge seal consult the separate seal instructions provided with the new seal.
Note: The standard bracket for the GlobalGear® pumps provides a vent to the seal chamber from suction port of the housing (See
Figure 4). Position the bracket so the vent hole lines up with the hole in the housing by the suction port.

Rebuild Drive Module Assembly

Place the rotor into the bracket and place this assembly on a flat surface so the shaft points upward. The orifice plug should be removed
on GG250 pumps and smaller if the viscosity of the application is greater than 7500 SSU (1650 CST). Install the bearing carrier onto the
bracket. Place the inner bearing cap over the shaft.
Install the new ball bearing onto the shaft. The bearing may have a slight press on the shaft so the bearing may have to be tapped on.
Ensure that it bottoms out on the shaft shoulder. The bearing must be pressed on the inner race, not the outer race. Pressing on the
outer race could damage the bearing.
Note: The standard bracket for the GlobalGear pumps provides a vent to the seal chamber from the suction port of the housing (See
Figure 4). Position the bracket so the vent hole lines up with the hole in the housing by the suction port. See Table 4 for proper torque
specifications.
CAUTION!
Do not use excessive force when pressing the bearing onto the pump shaft, as it could damage the mechanical seal.
Install the bearing lock washer and locknut. After the locknut is tightened, bend one of the lock washer tabs into the locknut slot to
ensure that the locknut cannot vibrate loose.

Nut Size Pump Size Foot - Pounds Newton - Meters

N - 05 GG015 - 030 50 - 70 68 - 95
N - 06 GG050 - 090 75 - 95 102 - 129
N - 07 GG120 - 210 100 - 130 136 - 176
N - 08 GG250 120 - 150 163 - 203
KM-12 GG550 120 - 150 163 - 203
Table 6 – Fastener torque requirements

Loosely fit the inner and outer bearing caps to the bearing carrier, using the bearing cap screws. DO NOT tighten the screws at this time.

Install Drive Module to Housing

Place the gasket on the bracket and slide the drive module into the housing and assemble with drive module bolts. Verify that the flush
holes in the bracket are lined up with the appropriate hole in the housing. Place idler assembly on cover and once the idler is on the
cover, ensure that it rotates freely.

V 2.1 Page 21 of 28
Install Cover and Idler Assembly
• Place the gasket on the cover
• Tilt the top of the cover away from the pump until the crescent can be fitted into the rotor i.D.
• Then rotate the idler until its teeth mesh with the rotor teeth
• Assemble with cover bolts and install relief valve to the housing or cover
Prior to reinstalling the relief valve back onto the pump housing or cover, ensure that the valve is clear of any foreign material and that
the flow ports are unobstructed. Place the valve gasket on the housing or cover and assemble the valve on the pump housing or cover
with valve screws. Make certain the adjusting screw of the valve points towards the suction port.
CAUTION!
The adjusting screw of the valve must point towards the suction port.

Adjustment of End Clearance

BEARING CARRIER

OUTER BEARING CAP

SETSCREW

GAP BETWEEN BEARING CARRIER

AND OUTER BEARING CAP

HEX HEAD BOLT

Figure 11 – Setting End Clearance

• Loosen the two setscrews on the outer bearing cap
• Slowly and evenly tighten the two hex head bolts on the outer bearing cap. This will slowly move the rotor towards the
cover. Continue this until the rotor contacts the cover. This can be determined by rotating the rotor by hand. Once you feel
the drag between the rotor and cover, stop. This is zero end clearance
• Measure the distance between the outer bearing cap and the bearing carrier. Use appropriate feeler gauges or gauge
blocks. Record this dimension and then remove the feeler gauges or gauge blocks. Note the position on the outer bearing
cap where the dimension was taken
• Loosen the two hex head bolts on the outer bearing cap
• Slowly and evenly tighten the two setscrews on the outer bearing cap until there is a gap slightly larger than the distance
measured in Step 3 above
• Determine the proper end clearance (refer to Table 6) and add that dimension to the dimension measured in Step 3 above.
Prepare feeler gauges or gauge blocks for the total dimension and insert between the outer bearing cap and the bearing
carrier in the same position that the original dimension (Step 3) was taken
• Start backing off the two setscrews equally. This will move the rotor towards the cover. Continue this until tension is felt on
the feeler gauges or gauge blocks
• Once the proper end clearance has been obtained, remove the feeler gauges or gauge blocks and tighten the two hex head
bolts
• Hand rotate the pump to ensure that it rotates freely without binding
V 2.1 Page 22 of 28
 Standard End Clearances For GlobalGear Series Pumps
Pump Size Cast Iron Stainless Steel Carbon Steel
GG015 0.003 - 0.005 inch ( 0.076 - 0.127mm) 0.006 - 0.008 inch ( 0.152 - 0.203mm) 0.003 - 0.005 inch ( 0.076 - 0.127mm)
GG030 0.003 - 0.005 inch ( 0.076 - 0.127mm) 0.006 - 0.008 inch ( 0.152 - 0.203mm) 0.003 - 0.005 inch ( 0.076 - 0.127mm)
GG050 0.005 - 0.007 inch ( 0.127 - 0.178mm) 0.008 - 0.010 inch ( 0.203 - 0.254mm) 0.005 - 0.007 inch ( 0.127 - 0.178mm)
GG070 0.005 - 0.007 inch ( 0.127 - 0.178mm) 0.008 - 0.010 inch ( 0.203 - 0.254mm) 0.005 - 0.007 inch ( 0.127 - 0.178mm)
GG080 0.005 - 0.007 inch ( 0.127 - 0.178mm) 0.008 - 0.010 inch ( 0.203 - 0.254mm) 0.005 - 0.007 inch ( 0.127 - 0.178mm)
GG090 0.005 - 0.007 inch ( 0.127 - 0.178mm) 0.008 - 0.010 inch ( 0.203 - 0.254mm) 0.005 - 0.007 inch ( 0.127 - 0.178mm)
GG120 0.007 - 0.009 inch ( 0.178 - 0.229mm) 0.013 - 0.015 inch ( 0.330 - 0.381mm) 0.007 - 0.009 inch ( 0.178 - 0.229mm)
GG130 0.007 - 0.009 inch ( 0.178 - 0.229mm) 0.013 - 0.015 inch ( 0.330 - 0.381mm) 0.007 - 0.009 inch ( 0.178 - 0.229mm)
GG200 0.008 - 0.010 inch ( 0.203 - 0.254mm) 0.013 - 0.015 inch ( 0.330 - 0.381mm) 0.008 - 0.010 inch ( 0.203 - 0.254mm)
GG210 0.008 - 0.010 inch ( 0.203 - 0.254mm) 0.013 - 0.015 inch ( 0.330 - 0.381mm) 0.008 - 0.010 inch ( 0.203 - 0.254mm)
GG250 0.008 - 0.010 inch ( 0.203 - 0.254mm) 0.013 - 0.015 inch ( 0.330 - 0.381mm) 0.008 - 0.010 inch ( 0.203 - 0.254mm)
GG550 0.015 - 0.017 inch ( 0.381-0.432 mm) 0.019 - 0.021 Inch (0.483 - 0.533mm) 0.015 - 0.017 inch ( 0.381-0.432 mm)
Table 7 - End Clearance Values for Standard Clearances

Note: Many Tuthill pumps are provided with non-standard clearances for use with high-viscosity or high-temperature fluids. Consult
the factory for clearances of these pumps.

Refit Coupling and Guard

If you have been able to take advantage of the modular design of this pump, the complete overhaul has been accomplished without
removal of the housing from the base plate or piping. Thus, your original coupling alignment should be intact. Refit the coupling and
spacer, double-check alignment and complete any final adjustments.

Safety Relief Valve Instructions

Tuthill provides safety relief valves on pumps for over-pressure protection only. They are not intended for use as flow control devices
or any other similar use.
CAUTION!
Continuous operation of the valve results in excessive heat build-up within the pumping cavity which can cause serious internal damage.
CAP GASKET BONNET
SPRING GUIDE SPRING POPPET
ADJUSTING SCREW

CAP

JAM NUT
BONNET GASKET

BODY
Figure 12 – Relief Valve

V 2.1 Page 23 of 28
Disassembly of relief valve (see figure 12)

Note the valve position in relation to the housing and suction piping. Ensure that system pressure has been relieved and that the driver
has been locked out prior to doing any service work.
• Remove the adjusting screw cap to expose the adjusting screw
• Measure and record the length of the exposed amount of the screw
• Loosen the adjusting screw to relieve initial spring pressure
• Remove the bonnet, spring guide, spring and valve poppet from the main valve housing
• Inspect all parts for wear or damage, in particular the valve seat area. Excessive wear or damage at this surface would be
cause for replacement of components
• Re-assembly of relief valve (see figure 12)
• Ensure all parts are clean, no foreign matter is in the valve and the ports are unobstructed
• Reassemble valve in the reverse manner as noted in disassembly procedure
• Reset the adjusting screw to the original position
Pressure adjustment of relief valve

The safety relief valves supplied on GG Series pumps are provided with springs that can be adjusted for various settings. Factory setting
on all valves is 100 PSI (6.9 bar) full bypass, unless another setting was specified at time of order. This setting will vary depending
on liquid viscosity and pump speed. If it must be changed from this factory setting due to your operating conditions, the following
procedure is used:
Place a pressure gauge on the pump discharge line as close as possible to the pump in order to obtain accurate readings. There must
be no restrictions between the gauge and pump. The pump housing has a tapped opening in the port area that is the best location for
this gauge
• Remove the adjusting screw cap and gasket to expose the adjusting screw
• Loosen the lock nut
• Start the pump running
• Slowly restrict the discharge line while observing the pressure gauge
• Stop immediately if the pressure rises above a safe level
With the discharge line fully closed, the gauge will read the full bypass pressure setting for the current speed and viscosity. Do not leave
the discharge line closed for a long time, since the fluid temperature will rise rapidly. Adjust the valve adjusting screw to obtain the
desired full bypass setting. Tighten the screw to increase the setting, and loosen it to reduce the setting
Once set, reopen the discharge line. This setting should be 15-25% above normal operating pressure presented by the system to ensure
the valve does not operate during normal use
CAUTION!
If there is some other flow control device present in the system that will vary the system pressure, the relief valve setting should be set
above this pressure to ensure the valve does not function during normal use.
• Tighten the locknut
• Install the adjusting screw cap and gasket.

V 2.1 Page 24 of 28
GlobalGear® Materials of Construction
Availability Compressor
Part Name Material Standard Comments
GGI GGS* GGC* Duty
cast iron (CI) ASTM A48 S S
Tutrided CI ASTM A48 surface hardened O
Housing, Cover
stainless steel (SS) ASTM A743, grade CF8M cast version of 316 SS S
cast steel (CS) ASTM A216, grade WCB S O
cast iron (CI) ASTM A48 S S
Bracket, Valve
stainless steel (SS) ASTM A743, grade CF8M cast version of 316 SS S
Body
cast steel (CS) ASTM A216, grade WCB S
Valve Block-Off steel AISI 1018 no contact with pumpage
S* S S
Plate
ductile iron (DI) ASTM A536, grade 80-55-06 S S S
Rotor Head,
Tutrided DI ASTM A536, grade 80-55-06 surface hardened O O
Idler Gear
stainless steel (SS) ASTM A494, grade CY5SnBiM "Nitronic 60" S
carbon steel (CS) AISI 4140 S S
hardened steel AISI 4140 induction hardened O O S
Rotor Shaft
stainless steel (SS) ASTM A564, grade 630 "Armco 17-4PH" S
hard-coated SS ASTM A564, grade 630 chrome oxide coated O
hardened steel AISI 1117 case hardened S S
Idler Pin stainless steel (SS) ASTM A564, grade 630 "Armco 17-4PH" O S
tungsten carbide grade C2 O O O
bronze SAE CA932 S
standard carbon carbon graphite resin O S S S
Bushings
high-temp carbon carbon graphite O O O
tungsten carbide grade C2 O O O
standard fiber with nitrile binder "Garlock" Style 3000 S
Gaskets high-temp graphite/316 SS "Garlock" Style 3125TC/
O S S
SS
Bearing Carrier cast iron (CI) ASTM A48 no contact with pumpage S S S
Cover Jacket ductile iron (DI) ASTM A536, grade 80-55-06 no contact with pumpage O O
cast iron (CI) ASTM A48 O*
Jacketed Bracket
stainless steel (SS) ASTM A276, grade 316 O
Availability Codes Pump Models
S= Standard material for this pump series GGI= GlobalGear®, Iron
O= Optional material for this pump series GGS= GlobalGear®, Stainless Steel
* Not available with GG550 pumps GGC= GlobalGear®, Cast Steel
Relief valves not available with GG550 angle ported pumps Compressor Duty: Stadard Viton O-ring

V 2.1 Page 25 of 28
GlobalGear® Temperature Limits

°F Clearances Pump Series Bushings Seal Elastomers Packing HT Opts °C

600 316

HT Carbon Bushings
550 288
Class H

500 260
475°F

HT Ball Bearing, Gaskets, and Paint

450 232
400 204

HT Tungsten Carbide Bushing (CI)

390 199
380 193
Class G

370 188
Cast Steel Construction

365 185
Cast Iron Construction

Standard Packing (PTFE/Graphite)

360 182
350
Stainless Steel Construction

177
300 149
Standard Carbon Bushings

Bushs (SS)
Bronze Bushings
Class A

HT TC

PTFE (See Note 3)

250 121

Viton

Standard Ball Bearing, Gaskets, and Paint

200 93
150 66
Std. Tungsten Carbide Bushings (CI)

Std. Tungsten Carbide Bushing (SS)

100 38
50 10
0 -18
Class 0

-10 -23
-20 -29
-30 -34
-40 -40
-50 -46
-100 -73

Notes: 1. A pump’s performance is dependent on more than just the temperature ranges of the component materials. 2. Pumps
with extra clearances may have reduced flow rates when operated at lower temperatures. 3. Pumps with PTFE seals also have PTFE-
encapsulated Viton O-rings which are limited to 400°F (204°C)
Clearance Class J = Chocolate Clearance Mods (Include Class B Clearance, Bronze Bushings, Root Drilled Idler & Drilled Rotor Head.)

V 2.1 Page 26 of 28
 Troubleshooting
Capacity is too low Mechanical defects
• Air leaks in suction line & losses are too high • Drive shaft and pump are misaligned.
• The suction lift is too great or the suction line is too • Pump is binding due to insufficient end clearance.
small or too long • Pump shaft is bent.
• This can be detected by installing a vacuum gauge • Misalignment within pump due to bad piping or
directly at the pump suction poor installation, causing strain or distortion.
• The maximum vacuum at the pump suction
Pump is noisy
should never exceed 15” of mercury
• Vaporization caused by higher vacuums will • Pump is cavitating due to inadequate suction
generally result in capacity drop off. Redesign conditions.
suction conditions • Misalignment of coupling.
• Pump speed is too slow • Coupling set too close to pump.
• Strainer too small or obstructed • Vibration of pump due to worn or bent shaft.
• Suction pipe or port not immersed deep enough • Air leaks on suction side of pump or air
in liquid entrainment in fluid.
• Piping improperly installed permitting air pocket Pump leaks
to form in the pump
• Increased clearances or wear in the pump • Bolts need tightening, allowing gaskets or O-rings
will sometimes cause the pump to deliver an to leak.
insufficient supply of liquid • Gaskets or O-rings are damaged.
• This may be corrected by reducing the thickness of No fluid is delivered
the cover gaskets
• Power is not on
• A folded gasket or a slight amount of dirt can
exaggerate the problem and cause leakage • Net positive suction head available (NPSHa) is
lower than required for the vapor pressure of the
• Refer to Assembly Procedure section for minimum
liquid pumped
end clearances
• You should calculate NPSHa and redesign piping,
Pump works spasmadically if necessary
• Leaky suction lines • Leaks in suction line or port passages can be
• Suction conditions vary detected by submerging pressure line from
discharge side of pump into a pail of liquid where
• Air or vapor in liquid
the air will be seen in the form of bubbles
• Problem: Excessive power draw
• Direction of shaft rotation is incorrect
• Pressure too high
• Relief valve setting is too low
• Liquid more viscous than originally expected
• Liquid is discharging through the bypass port
• Suction or discharge lines obstructed
• Insufficient horsepower Note: Packings are designed to leak. Leakage should be at a
rate that will prevent excessive heating on the bracket at the
packing area.

V 2.1 Page 27 of 28
Material Returns
If it becomes necessary to return a pump to the factory, a Return Goods Authorization (RGA) must be obtained from either your local
Authorized Distributor or our Alsip plant. No RGA can be issued until a completed Material Safety Data Sheet (MSDS) has been
forwarded to our Alsip plant and return of the pump approved.
• Tuthill pumps are precision built and must be handled with care
• Pumps must be drained of all fluid and the ports plugged to prevent foreign material from getting into the pump
• Pumps must be packaged securely to prevent damage while in transit

Warranty
Tuthill Pump Group warrants its products against defective material and workmanship for 90 days from the date of startup or one year
from date of shipment from Tuthill’s plant, whichever comes first. This warranty does not include products damaged by tampering,
improper installation, abuse, or wear. Nor does it cover consequential damages, or other losses due to pump failure.
Because of the unpredictable nature of fluids encountered, pumps are not warranted for any specific life.
Performance curves, dimensional data, and other product information is also available on the website.

Tuthill Pump Group Excellence at work. Excellence in life.

USA • United Kingdom • China
www.tuthillpump.com