793C Off-Highway Truck ATY00001-UP (MACHINE) POWERED BY 3516 Engine...

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Producto: TRUCK
Modelo: 793C TRUCK ATY
Configuración: 793C Off-Highway Truck ATY00001-UP (MACHINE) POWERED BY 3516 Engine

Pautas de reutilización y recuperación

HVOF Identification and Polishing (Superfinishing){0674, 0679, 1000, 7000, 7562}
Número de medio -SEBF9233-03 Fecha de publicación -28/08/2014 Fecha de actualización -28/08/2014

i05751641

HVOF Identification and Polishing (Superfinishing){0674,

0679, 1000, 7000, 7562}
SMCS - 0674; 0679; 1000; 7000; 7562

Agricultural Tractor: All

Articulated Truck: All
Asphalt Paver: All
Backhoe Loader: All
Challenger: All
Cold Planer: All
Combine: All
Compact Track Loader: All
Compact Wheel Loader: ALL
Earthmoving Compactor: All
Engine: 3300 3400 3400 All, 3300 All, 3200 All, 3100 All, 3000 All, and D-series All All 3500
Engines All 3600 Engines All C280 Engines C-10 All C-9 and C9 All C11 All C12 and C-12
All C13 and C-13 All C15 and C-15 All C16 and C-16 All C175 Engines C18 and C-18 All
C27 All C32 All C7 All
Excavator: All
Forest Products: All
Integrated Toolcarrier: All
Landfill Compactor: All
Load Haul Dump: All
Mini Hydraulic Excavator: All
Motor Grader: All
Multi Terrain Loader: All
Off-Highway Truck/Tractor: All
CAT MT4400D AC (S/N: MH41-UP; MT41-UP)
CAT MT5300D AC (S/N: MN51-UP; MT51-UP)
MT3300 (S/N: SE21-UP)
MT3700 (S/N: SE31-UP)
MT4400 (S/N: SE41-UP)
MT5500 (S/N: SE51-UP)
MT6300 (S/N: SE61-UP)
Paving Compactor: All

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Pipelayer: All
Road Reclaimer/Soil Stabilizer: All
Skid Steer Loader: All
Soil Compactor: All
Telehandler: All
Track Feller Buncher: Caterpillar
Track-Type Loader: All
Track-Type Skidder: All
Track-Type Tractor: All
Underground Articulated Truck: All
Wheel Dozer: All
Wheel Feller Buncher: All
Wheel Loader: All
Wheel Skidder: All
Wheel Tractor-Scraper: All
Continuous Haulage:
FH330 (S/N: FHY1-UP)
Continuous Miner:
CM340 (S/N: GEZ1-UP)
CM345 (S/N: GE21-UP)
CM445 (S/N: GE51-UP)
Scoop:
SU482 (S/N: LAP1-UP)
SU488 Series DM (S/N: LA41-UP)
SU488 Series DN (S/N: LA31-UP)
SU488 Series L (S/N: LA51-UP)
SU488 (S/N: LAX1-UP)
SU488D (S/N: LA21-UP)
Underground Carrier:
SH630 (S/N: RS31-UP)

Introduction
Table 1
Revision
Summary of Changes in SEBF2101

Changed name of supplier from Sulzer Metco to Oerlikon Metco, and added
03
Expanded Mining Product.
Added confidentiality statement and safety information. Updated surface analyzer
02
information.
Change reference from HVOF Spray Guide CD, SERF8705 to Fundamentals of
01 High Velocity Oxygen Fuel (HVOF) Spray for Reconditioning Components,
SEBF9236.

© 2014 Caterpillar All Rights Reserved.This guideline is for the use of Cat dealers only.
Unauthorized use of this document or the proprietary processes therein without permission may be
violation of intellectual property law. Information contained in this document is considered
Caterpillar: Confidential Yellow.

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This Reuse and Salvage Guideline contains the necessary information to identify and polish
(superfinish) high velocity oxygen fuel (HVOF) spray coating on a rod. For complete details of
the entire process as recommended by Caterpillar Inc., refer to Fundamentals of High Velocity
Oxygen Fuel (HVOF) Spray for Reconditioning Components, SEBF9236.

For questions or additional information concerning this guideline, submit a form for feedback in
the Service Information System. In order to address an urgent issue, use the following resources in
order to communicate your request to Caterpillar Repair Process Engineering:

• Caterpillar Dealer Technical Communicator

• Dealer Solution Network

• Caterpillar Technical Representative

• Knowledge Network

Safety

Illustration 1 g02139237

This bulletin is a reference to information provided in equipment operation manuals. Cat dealers
are requested to read the safety sections of operation manuals cited in this bulletin.

Note: Refer to operation manuals for Oerlikon Metco equipment as the primary source of
operating and safety information. Other references for operating and safety information are the
following:

Table 2
Safety References
Publication Title Publisher
"Flame Spray Handbook Vol. II - Powder Process" Oerlikon Metco
American Welding Society
"Welding Handbook, 8th ed., vol. 3"

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"Thermal Spraying: Practices, Theory, Applications and Safety." American Welding Society

Like any process that generates dust and fumes, the HVOF spray process involves a potential
hazard to personnel. All personnel involved in this process must understand and become familiar
with operating practices and regulations [OSHA standards (US) or equivalent] for compliance.

Information in this bulletin is derived from the sources mentioned, but not all of the safety points
are covered here.

Environmental Health & Safety Advisory

High Velocity Oxygen Fuel (HVOF) Thermal Spray is a process that is an alternative to hard
chrome electroplating on parts used in Caterpillar Products. Chrome electroplating uses the
hexavalent form of Chromium, which is recognized by the international Agency for Research on
Cancer (IARC) as a human carcinogen. Many countries have Occupational Exposure Limits
(OEL'S) for Hexavalent Chromium, which range from 0.005 mg/m3 (3.12x10-10 lb/ft3) to 0.05
mg/m3 (3.12x10-9 lb/ft3) for an 8-hour Time Weighted Average (TWA) exposure. The
electroplating process requires extensive EHS controls because of the hazards posed to employees
and the environment by corrosive acid solutions of Hexavalent Chromium. The HVOF process is
a dry process that eliminates the need for employee handling of corrosive chromic acid solutions.
The HVOF process can be operated manually or robotically in a controlled booth environment.
While the HVOF process can facilitate compliance with OEL'S and comprehensive standards like
the OSHA Hexavalent Chromium Standard, the HVOF process has inherent safety and health
hazards, which must be addressed. The metal powders used for chrome coating can contain
Chromium and other nickel. In order to protect employees and comply with OEL'S for Hexavalent
Chromium and other materials, implementing the following actions is required:

Fire Prevention and Protection

Precautions for HVOF spray are essentially the same as for welding and cutting. Airborne metal
dust, or finely divided solids, should be treated as a possible explosive as well as a breathing
hazard. Adequate ventilation must be provided to minimize the danger of dust. Metal Powders
used to deposit Chromium can also contain Nickel. The HVOF process will create dust particles,
which can contain Nickel and some Hexavalent Chromium. Measure employee exposure time to
document employee exposure to Hexavalent Chromium and Nickel.

U.S. Federal EPA emission standards require that exhaust systems for the HVOF spray industry
have an efficiency of 99.99%. Federal, state, and local exhaust emission requirements in North
America have become more demanding.

In the flame spray industry, the Dry Cartridge Dust Collection System is the most effective
method for cleaning exhaust gasses.

Enclosed operations would also need local exhaust ventilation systems equipped with dust
collectors. Employees performing maintenance on the dust collection systems will need to use
respiratory protection, disposable coveralls, and protective gloves to minimize inhalation and skin
exposure to Hexavalent Chromium and Nickel.

Good housekeeping must be practiced to avoid the accumulation of metal dust. Paper, wood, oily
rags, and flammable solvents must be removed from the spraying area.

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Safety Material

Compliance with OSHA Hazard Communication Standard requires current Material Safety Data
Sheet (MSDS) and employee training.

Operating Considerations

HVOF differs from welding and cutting processes in sound generation. The high exhaust gas
velocity generates noise levels of over 110 dB. Chronic exposure will likely result in hearing loss.
A combination of booth sound insulation and personal equipment (earplugs and earmuffs) should
be used, to reduce this noise to a safe working level.

Like welding, the HVOF process involves gas cylinders or bulk gas containers. Improper storage,
handling, and/or use of gas cylinders can create serious safety hazards. For example, if a valve is
broken off a full gas container during a fall, the container will become a missile. If an oil-
contaminated regulator or gauge is installed in an oxygen system, the assembly will explode.

For further detail on these operating hazards, refer to the following:

Table 3
Operating Considerations References
Publication Title Publisher
"Safety in Welding, Cutting, and Allied American National Standards Institute and
Processes" ANSI/ASC Code Z49 American Welding Society

HVOF Spray Equipment

Maintain and operate HVOF spray equipment exclusively to standards set by the equipment
manufacturer. All operators must be instructed to become familiar with the operation of the spray
equipment. If an HVOF spray gun malfunctions or backfires, the cause of the trouble must be
investigated.

When HVOF spraying is completed, the system must be properly "shut down" as follows:

1. Close all gas cylinder valves.

2. Open the gun valves to release hose gases, with room ventilation on.

3. Back out all regulator screws until free.

4. Close the gun valve.

5. Check all first stage regulators to ensure that no pressure buildup is taking place. Pressure
buildup would indicate that a bottle valve has not been tightly closed.

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Never use an open flame to light the thermal spray gun. Serious burns
or other personal injury could result. Equip the gun with an electric
ignition system or use a spark lighter.

Abrasive Blasting Equipment

Maintain blasting equipment according to the manufacturer specifications. Replace worn parts for
efficient operation. Replace deteriorated hoses and nozzles.

Grit blasting produces airborne particulates that can act as respiratory

irritants. If inhaled, these particulates can cause serious injury or death.
Additionally, the grit from this process can be abrasive to the skin and
eyes of the operator and can cause serious injury. If grit blasting is
performed manually or outside of a grit blast cabinet, operators must
be provided with respiratory protection, face shields, and helmets.
Information on face shields and helmets can be found in ANSI/ISEA
Z87.1 (American National Standard for Occupational and Educational
Eye and Face Protection Devices) and ANSI/ISEA Z89.1 (American
National Standard for Industrial Head Protection). Information on the
selection, operation, and maintenance of a respiratory device can be
found in ANSI/AIHA Z88.2 (Practices for Respiratory Protection) or
other local approval authority documentation.

Mechanical Stripping and Finishing Equipment

Maintain lathes, grinding, and finishing equipment according to the manufacturer specifications.
Replace worn parts for efficient operation. All operators must be instructed to become familiar
with the lathe and grinding equipment operations.

Serious injury or death can result from contact with rotating parts or
pinch points. To avoid injury, rotating parts, such as grinders,
superfinishers, and lathes, should only be operated if all guards and
protective devices are properly installed and in good working order. All
equipment should be operated according to the manufacturer
instructions.

Other Safety Hazards

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Other safety hazards include compressed gases, thermal burns, high voltage, and mechanical pinch
points from robots and turntables. These are potential ergonomic hazards involved with handling
parts. The American Society of Metals Thermal Spray Society (TSS) has made two Safety
Guidelines available to help provide control of the process: "SG001-02 Safety Guidelines for the
Handling and Use of Gases in Thermal Spraying", and, "SG003-03 Thermal Spray Booth Design
Guidelines". The guidelines are available free from TSS web site or Corporate EHS.

HVOF Identification
Before a repair option can be decided upon, identify the material on the rod. The difference
between HVOF and chrome is not obvious at a glance. One way to identify HVOF is by visual
inspection. HVOF will be present in the weld area between the rod and the eye as in Illustration 2.
The HVOF in this area will not be polished and will be dull gray in color and rough to the touch.
If the weld area is chrome plated, the appearance will be shiny and smooth to the touch.

Illustration 2 g02624696

The visual description above also applies to suspension cylinders, struts, and hoist cylinders. As
seen in Illustration 3, the HVOF will be present near the bottom of a strut where the diameter
tapers down. The HVOF will be present on the end of a hoist cylinder where the piston bolts on.

Illustration 3 g02624717

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On this rod, the dull gray band between the two delineative dashed lines has been sprayed with HVOF but has not
been surface finished.

Illustration 4 g02700917

The freckle-like aggregate surface seen in HVOF compared to chrome surface. Surfaces viewed through 8S-2257
Eye Loupe As of 10x magnification and a 5x zoom camera lens.

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Illustration 5 g02701836

The freckle-like aggregate surface on HVOF can be seen with the unaided eye. Most noticeable though, is the
reflection of white light on HVOF compared to the reflection of dispersed red and green light on chrome.

Another method of visually inspecting rods for HVOF coating involves using a brightly focused,
white light shown lengthways down the rod. When using an eye loupe, small freckle-like
aggregate surface can be seen in the HVOF coating (Illustrations 4 and 5) that will not be seen in
chrome. Conversely microfissures may be found in the chrome that should not appear in HVOF. If
the rod is HVOF coated, then the aggregate surface is not detrimental to the finish or the function
of the rod. By shining the light at an angle to the rod in the long direction, chrome rods will glint
light back prismatically everywhere the light reflects off a microfissure meaning a full spectrum of
color will be seen. When HVOF reflects light off the edges of the contours, the light will appear
white and undispersed. These reflections appear as sparkles and are more easily identified by color
under slight magnification such as an eye loupe or magnifying glass. Generally HVOF finishes are
more dull than chrome but this comparison is hard to recognize unless the two finishes are viewed
side by side.

Additionally, surface roughness is a good indicator between chrome and HVOF hydraulic rods.
HVOF finishes generally have a higher roughness reading when measured with a profilometer on
the Ra (roughness average) scale. The most simple practice for obtaining a surface roughness
value is by use of a stylus profilometer. Portable industrial-use profilometer units are the most
practical and facilitate measuring the surface roughness of rods that are still assembled on the
machine being serviced. However, stationary units can serve the same purpose for disassembled
rods and may provide more accurate results or additional information about the rod surface.

The recommended practice for using a profilometer is to steadily support the unit on the hydraulic
rod being examined and record a minimum of four measurements using a 17.5 mm (0.69 in) trace
length and a 0.8 mm (0.03 inch) cutoff at each end of the measurement in varying locations on the
rod. It is recommended to use a 5 µm (200 µin) diamond stylus for measuring. It is important to

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clean the surface of the rod with 70% isopropyl alcohol before taking any surface measurements,
as contamination on the rod will skew the measurement. Also, keep in mind that external
vibrations can affect the results.

Generally, the roughness of HVOF coated rods will be greater than 0.10 µm (3.94 µin) on the Ra
scale and the roughness of chrome coated rods will be less than 0.12 µm (4.72 µin) on the Ra scale
as shown in Illustration 6. It is important to note that this test alone is not definitive especially if
the recorded roughness of a rod is included in the overlap of chrome and HVOF roughness values.
Be sure to use this test in addition to the other practices listed in this document before making a
conclusion on the hydraulic rod coating material in question. The surface roughness measurement
can also be taken using the Rz scale. A new HVOF coated rod will measure 0.7 µm (27.56 µin) Rz
or less.

Illustration 6 g02731719

Ra values of chrome and HVOF as measured with a stylus profilometer.

The following surface analyzers are available through the Caterpillar parts system:

• 448-3697 MarSurf M300 and Drive Unit MarSurf RD 18

• 448-3698 MarSurf PS1

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Illustration 7 g03507589

448-3697 MarSurf M300 and Drive Unit MarSurf RD 18

Illustration 8 g03507627

448-3698 MarSurf PS1

The OmniSurf software package is available for use with the MarSurf M300, and will provide the
following features:

• Processing of measured or created profiles

• Graphical presentation of the processed profile in the working area

• Graphical presentation of the loaded or recorded profile in the overview area

• Roughness evaluation of the zoomed profile sections

• Measurement/evaluation of interrupted profiles, excluding profile sections, for example,

bores

• Presentation of the aligned profile as well as the waviness and roughness profiles in separate
areas

• Presentation of the altered profile as a result profile

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• Storage of the processed profile, i.e. the result, in a file

NOTICE

Using a grinding or abrasive wheel for spark testing on rod finishes is

potentially destructive. Reduce the chance of ruining the surface by
taking care to use very light pressure. Rough surfaces that result from
spark testing can ruin hydraulic seals and allow contamination into the
system if left unfinished when installed.

A potentially destructive method to use is to lightly touch a grinding wheel to the surface of the
rod. Care must be taken not to apply too much pressure when performing this test. This test should
be performed in an area that will not be in contact with the seals. Briefly touch the grinding wheel
to the surface finish and identify the color of the spark produced. A white spark indicates the
coating is chrome, a yellow spark indicates the base material, and no spark indicates an HVOF
coating.

HVOF Polishing Equipment

A mechanical method will be used to polish all HVOF components. The choices of superfinishing
equipment that will attach to a lathe are:

Supfina (www.supfina.com)

Technology Center Wolfach

Germany Supfina Grieshaber GmbH & Co. KG
77709 Wolfach/Germany
49 (7834) 866-0info@supfina.com

Technology Center North Kingstown

USA Supfina Machine Company, Inc.
181 Circuit Drive
North Kingstown, RI 02852/USA
1 (401) 294-6600info@supfina.com

Supfina Beijing-Office
China Beijing Representative Office
DiYang Tower, 1202B
Chaoyang District
Beijing 100027/P.R. China
86 (10) 84536-669supfina@126.com

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Illustration 9 g02611597

Supfina 210 Super Finisher

IMPCO Machine Tools (www.impco.com)

3417 West St. Joseph Street

Lansing, Michigan USA 48917
1 (517) 484-9411sales@impco.com

Illustration 10 g02714578

IMPCO Microstar Attachment

Grinding Equipment & Machinery Company, LLC. (www.gem-usa.com)

15 South Worthington Street

Youngstown, OH 44502
1 (330) 747-2313

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Illustration 11 g02714579

GEM 04150-S Microfinisher

For information on a lathe contact:

Abbott Machine Co. (www.abbottmachineco.com)

700 W. Broadway
Alton, IL 62002
1 (618) 465-18981 (800) 262-6478

Illustration 12 g02611476

Lathe with grinder attachment

Equipment Specifications

• Variable Speed Controller

• 14.9 kW (20.00 hp) motor

• Digital Amp load readout

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Illustration 13 g02611678

SG-6 control panel

HVOF Super Finishing Abrasives

All applications will use 3M Diamond Microfinishing film 675L (20.0 µm (0.79 µin)) to finish
HVOF.

3M (www.3m.com)

3M Global Headquarters
St. Paul, MN 55144-1000
1 (888) 364-3577

Illustration 14 g02714576

3M Diamond Microfinishing Film 675L

Super Finishing:

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Illustration 15 g02611617

Finisher's Tech SF-4 Super Finisher

101.6 mm (4.00 inch) wide 3M diamond strips will be required for the Finisher's Tech SF-4 Super
Finishing Machine and 203.2 mm (8.00 inch) wide 3M strips will be required for the optional
equipment (Finisher's Tech SF-8 Super Finisher Machine). The 3M strips can be ordered in
various lengths.1219.2 mm (48.00 inch ) with a 609.6 mm (24.00 inch) leader and 609.6 mm
(24.00 inch) tail is a standard length. The leader and tail portion is required to feed the strips
through the super finisher.

A good measure is to keep a few of the plastic spools the 3M strips are shipped on. This practice
can reduce the machine setup time when switching 3M strip grades.

HVOF Super Finishing Mechanically

Use the super finisher to lightly grind the component to the proper size and surface finish.

Although finishing components to a specified size and surface finish using only a grinder is
possible, a super finisher has three important purposes. First, the process will remove any
blemishes or "striping" (barber poling) the belt grinder leaves on the component. This step will
eliminate variations in finish due to lathe conditions and operator experience. Second, the process
produces a slight crosshatch in the coating similar to the fine cracks which occur in plated
surfaces. This finish is desirable to help lubricate seals and enhance seal life. The third purpose is
to achieve a more polished surface appearance, which is similar to the finish produced by plating.
A 20.0 µm (0.79 µin) film should be used for superfinishing.

Note: Care must be taken to monitor final surface finish as belts wear.

The super finisher should be mounted to the cross slide of a lathe. To save floor space and reduce
capital investment, the super finisher can be combined with a rear-mounted belt grinder setup on
one lathe. This arrangement will allow both operations to be performed on the same machine,
avoiding excess material handling.

HVOF coatings can be super finished at a rate of 12.7-38.1 µm (0.50-1.50 µin) per pass at a
traverse rate of 0.64 m/min (25.0 in/min).

Coolant with a rust and bacteria inhibitor is required for the HVOF super finishing operations.
Hard water may require treatment, since minerals can interfere with rust inhibitors and other
coolant additives. The coolant should be flooded into the contact area between the abrasive and

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the component. As contact pressures increase, the pressure of the coolant should be enough to
assure that the abrasive and component are being cooled properly. To improve diamond film life,
a coolant formulated for machining high nickel content materials should be used. The following
coolants meet this requirement:

• Castrol WE3-046A

• Castrol Syntello 9954

• Cincinnati Milacron CimPerial 1070

• Bosse Grind Rust Bar 750 (Star Metal Fluids)

• Milicron 46C

Since lathe coolant systems are only designed to let coarse chips collect in the sump, the system
must be modified to provide adequate filtrations. The lathe pump should pipe the coolant to an
auxiliary filtering system which is at least 50% efficient for 10 µm (0.39 µin) particles. This
process is necessary to remove abrasive "mud" which can damage rod finish and also the lathe.
The modifications should also include coolant plumbing to wash abrasive material from the
machine ways to prevent premature wear. A filter tank/pump setup using an automatically
advancing paper roll element has several advantages. These systems have far more capacity than
canister filters and can be sized to handle several machines simultaneously. Filter fixture suppliers
include:

• Oberlin Filter Company

• Filtra Systems Hydromation Division

• J.R. Schneider Co., Inc

• Hoffman Air and Filtration Systems

Illustration 16 g02611696

Oberlin Coolant Filtration System

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Oberlin Fitler Company can be contacted by the following means:

Oberlin Filter Company

404 Pilot Ct.
Waukesha, WI 53188
http://www.oberlinfilter.com/

Filter paper suppliers include:

• Lydall Manning

• National Filter Media Corp.

• Industrial Filter Fabrics

The products and manufacturers listed here are not intended as the only acceptable choices. For
information on these or other suppliers, questions, or to address an urgent issue, use the following
resources to communicate your request to Caterpillar Repair Process Engineering: Cat Dealer
Technical Communicator, Dealer Solutions Network, Caterpillar Technical Representative, or
Knowledge Network.

Check with your local environmental authorities on the handling of waste coolant and filter
material.

Copyright 1993 - 2022 Caterpillar Inc. Mon Mar 7 09:58:28 UTC-0300 2022
Todos los derechos reservados.
Red privada para licenciados del SIS.

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