Specifications for Rear Suspension Cylinder Components Used in Off-Highway Trucks {7201} Caterpillar

Off-Highway Truck/Tractor

All

Introduction

© 2017 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.

This Reuse and Salvage Guideline contains the necessary information to allow a dealer to establish a parts reusability program. Reuse and salvage information enables Caterpillar dealers and customers to benefit from cost reductions. Every effort has been made to provide the most current information that is known to Caterpillar. Continuing improvement and advancement of product design might have caused changes to your product which are not included in this publication. This Reuse and Salvage Guideline must be used with the latest technical information that is available from Caterpillar.

For technical questions when using this document, work with your Dealer Technical Communicator (TC).

To report suspected errors, inaccuracies, or suggestions regarding the document, submit a form for feedback in the Service Information System (SIS Web) interface.

Canceled Part Numbers and Replaced Part Numbers

This document may not include canceled part numbers and replaced part numbers. Use NPR on SIS for information about canceled part numbers and replaced part numbers. NPR will provide the current part numbers for replaced parts.

Note: Illustrations in this guideline may appear different from some of the components. Although the illustrations are typical, the dimensions are actual.

Summary

The major components in the rear suspension cylinders can be salvaged and used again by following established methods. The cylinder assembly can be salvaged by light honing or retubing. The rod assembly can be salvaged by rechroming and polishing.

This guideline provides dimensional specifications for the salvage of components of all rear suspension cylinder groups used in Caterpillar off-highway trucks. Refer to Guideline for Reusable Parts, SEBF8072, "Inspection and Salvage of Hydraulic Cylinder Components", for reconditioning methods and procedures.

When used in the same application, parts that meet "Use Again" specifications in this guideline can be expected to provide normal performance until the next overhaul.

Never install a part that this guideline shows cannot be used again. During reconditioning, correct any conditions that might have caused the original failure.

Note: The cylinder heads are made from ductile iron. Welding on the cylinder heads and then machining to repair the seal lands is NOT recommended.

Important Safety Information

Illustration 1	g02139237

Work safely. Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools to perform these functions properly. Safety precautions and warnings are provided in this instruction and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. Therefore, the warnings in this publication and the warnings that are on the product are not all inclusive. If a tool, a procedure, a work method, or operating technique that is not recommended by Caterpillar is used, ensure that it is safe for you and for other people to use. Ensure that the product will not be damaged or the product will not be made unsafe by the operation, lubrication, maintenance, or the repair procedures that are used.

Show/hide table

Improper operation, lubrication, maintenance or repair of this product can be dangerous and could result in injury or death. Do not operate or perform any lubrication, maintenance or repair on this product, until you have read and understood the operation, lubrication, maintenance and repair information.

Safety precautions and warnings are provided in this manual and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons.

The hazards are identified by the “Safety Alert Symbol” which is followed by a “Signal Word” such as “DANGER”, “WARNING” or “CAUTION”. Refer to Illustration2 for an example of a “WARNING” Safety Alert Symbol.

Illustration 2	g00008666

This safety alert symbol means:

Pay Attention!

Become Alert!

Your safety is Involved.

The message that appears under the safety alert symbol explains the hazard.

Operations that may cause product damage are identified by "NOTICE" labels on the product and in this publication.

Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. The safety information in this document and the safety information on the machine are not all inclusive. Determine that the tools, procedures, work methods, and operating techniques are safe. Determine that the operation, lubrication, maintenance, and repair procedures will not damage the machine. Also, determine that the operation, lubrication, maintenance, and repair procedures will not make the machine unsafe.

The information, the specifications, and the illustrations that exist in this guideline are based on information which was available at the time of publication. The specifications, torques, pressures, measurements, adjustments, illustrations, and other items can change at any time. These changes can affect the service that is given to the product. Obtain the complete, most current information before you start any job. Caterpillar dealers can supply the most current information.

Service Letters and Technical Information Bulletins

References

Cleaning Recommendations

Show/hide table

Personal injury can result when using cleaner solvents. To help prevent personal injury, follow the instructions and warnings on the cleaner solvent container before using.

Show/hide table

Personal injury can result from air pressure. Personal injury can result without following proper procedure. When using pressure air, wear a protective face shield and protective clothing. Maximum air pressure at the nozzle must be less than 205 kPa (30 psi) for cleaning purposes.

Cylinders should be cleaned prior to inspection. The surface must be free from rust, grease, oil, and burrs that can mask the indications of unacceptable defects.

Note: Use all cleaning solvents and solutions with care. Wear eye and ear protection when using high pressure cleaning equipment. Always use cleaning solvents in a well-ventilated area. Always wear protective clothing when using caustic cleaning solutions. Failure to follow the precautions provided by the manufacturer of the cleaning equipment, and/or solvents, can result in bodily injury.

Note: Pressurized air can cause personal injury. When using pressurized air for cleaning or drying parts, wear a protective face shield, protective clothing, and protective shoes. The maximum air pressure must be below 200 kPa (30 psi).

• Before a part is inspected, clean the part thoroughly to remove all debris, paint, and oil.

• When lifting or moving parts to be cleaned, use proper lifting devices to provide for operator safety, and to prevent part damage.

• During cleaning, do not damage machined surfaces.

• Use pressurized air to dry parts.

• If inspection is not done immediately after cleaning, put hydraulic oil on all machined surfaces to prevent rust or corrosion. Carefully store parts in a clean container.

• Use appropriate thread taps to chase all threaded holes.

Cylinder Housing Dimensions

Illustration 3	g01309728
(A) Cylinder overall length ± 0.5 mm (0.02 inch) (B) Cylinder bore length (C) Cylinder bore ID (D) Bore surface finish (E) Eye bearing bore ID (F) Eye retaining ring groove ID (G) Eye retaining ring groove width (H) Dim between retaining ring grooves

Cylinder Rod Assembly Dimensions

Illustration 4	g01309957
(A) Cylinder rod overall length (B) Cylinder rod OD (over chrome) (C) Piston OD (D) Wear band groove OD (E) Piston wear band groove width (F) Piston length (G) Rod eye bearing bore ID (H) Rod eye retaining groove ID (I) Rod eye retaining ring groove width (J) Distance between retaining ring