Field Inspection of Bogie Cartridge Pins on Suspended Undercarriage {4150, 4192, 4194, 7217, 7950} Caterpillar

Pipelayer

PL83 (S/N: CB21-UP; KSD1-UP; DLW1-UP)

PL87 (S/N: TEC1-UP; ZAC1-UP; KKJ1-UP)

Track-Type Tractor

D10 (S/N: 84W1-UP; 76X1-UP)

D10N (S/N: 2YD1-UP; 3SK1-UP)

D10R (S/N: 3KR1-UP; AKT1-UP)

D10T (S/N: RJG1-UP)

D11N (S/N: 4HK1-UP; 74Z1-UP)

D11R (S/N: AAF1-UP; 8ZR1-UP; 9TR1-UP; 9XR1-UP; 7PZ1-UP)

D11T (S/N: AMA1-UP; GEB1-UP; TPB1-UP; MDG1-UP; JEL1-UP; JNS1-UP)

D8L (S/N: 4FB1-UP; 7YB1-UP; 7JC1-UP; 53Y1-UP)

D8N (S/N: 9TC1-UP; 1XJ1-UP; 5TJ1-UP; 7TK1-UP)

D8R (S/N: 7XM1-UP; 9EM1-UP; 6YZ1-UP)

D8R Series II (S/N: AKA1-UP)

D8T (S/N: J8B1-UP; MLN1-UP; FCT1-UP; KPZ1-UP)

D9L (S/N: 14Y1-UP)

D9N (S/N: 1JD1-UP; 6XJ1-UP)

D9R (S/N: JJB1-UP; ABK1-UP; ACL1-UP; 7TL1-UP; 8BL1-UP; WDM1-UP)

D9T (S/N: TWG1-UP; RJS1-UP)

Introduction

© 2018 Caterpillar All Rights Reserved. This guideline is for the use of Caterpillar 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 Undercarriage Reconditioning Bulletin 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 Undercarriage Reconditioning Bulletin must be used with the latest technical information that is available from Caterpillar.

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

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

Field Inspection of Bogie Cartridge Pins on Suspended Undercarriage

Summary

This bulletin shows the procedure needed to perform a field inspection of the bogie cartridge pins on Tractors equipped with suspended undercarriage. Inspection can identify parts that are worn or damaged so parts can be replaced before damage occurs to the track roller frame and bogie bores. Early attention to minor problems can prevent damage and help to keep downtime and repair costs to a minimum.

Intervals for inspection of bogie cartridge pins will vary according to the severity of the machine application. Guidelines for setting inspection schedules are given at the end of this bulletin.

References

Reference: Undercarriage Reconditioning Bulletin, REHS1757, "Rebuild Guidelines for the Suspended Undercarriage"

Reference: Undercarriage Reconditioning Bulletin, SEBF8594, "Nitrogen Pressure Test Unit FT2724"

Reference: Special Instruction, REHS0517, "Front Track Roller Frame Repair"

Reference: Special Instruction, SEHS8971, "Rebuild Guidelines for the Suspended Track Roller Frames"

Reference: Special Instruction, SMHS7981, "Procedures For Repair Of Cartridge Pin Bores"

Reference: Service Magazine, SEPD1530, "Undercarriage Idler Oil Has Changed from Mineral Base Oil to Synthetic Oil on D10R, D10T, D11R, and D11T Track-Type Tractors"

Safety

Illustration 1	g02139237

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.

This bulletin may contain hazardous steps. A safety alert symbol like the one below is used to call attention to a hazard.

Warning messages identify a specific, imminent, latent, hazard that has a reasonable probability of resulting in personal injury or death if the warning is ignored.

Show/hide table

The machine must be on a level, hard surface before a separation of the track is made. Any time a separation of both tracks is made, the machine must have blocks correctly positioned so the machine will not move.

Show/hide table

Do not attempt to disassemble or assemble this machine until you read and understand the disassembly and assembly instructions. Improper disassembly and assembly procedures could result in injury or death.

Canceled Part Numbers and Replaced Part Numbers

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

Inspection Procedure

Look for oil dripping between the bogie and the track roller frame. Pins that leak should be scheduled for repair to prevent damage to the bogie and track roller frame bores.

If no leaks are found, inspect the pins according to the schedule recommended in the section titled “Inspection Intervals”.

Illustration 2	g02194893
Access hole in the retaining plate that covers the major bogie cartridge pins

Measure the oil level in the bogie cartridge pins through the access hole behind the retaining plate. The retaining plate covers the bogie cartridge pin bore and the end of the cartridge pin. See Illustration 2

Illustration 3	g02195093
Cover removed to show end of minor bogie cartridge pin.

To check the oil level in bogie cartridge pins, remove the cover for access to the plastic plug in the stopper in the end of the pin. See Illustration 3

Illustration 4	g02195173
Drive the plastic plug into the pin hole to check the oil level.

Drive the plastic plug in the center of the rubber stopper in to the pin with a hammer and punch. If oil flows out of the plug hole, the oil reservoir is full. Immediately install a new plug. If the oil is cold, oil may not flow out of the hole even when the oil reservoir is full. See Illustration 4

Illustration 5	g02195254
Insert a clean straight wire into the pin reservoir.

If no oil flows out of the plug hole, use a clean straight wire to measure the amount of oil in the pin reservoir. Insert the wire straight into the hole, so that the wire stays parallel to the axis (along the centerline) of the pin as in Illustration 5

Illustration 6	g02280217
Use a 170-5664 Test and Fill Cart Gp or the FT-2724 Nitrogen Pressure Test Unit to perform a pressure test on the bogie cartridge.

If there is no oil on the wire when removed from the pin reservoir use a 170-5664 Test and Fill Cart Gp or the FT-2724 Nitrogen Pressure Test Unit to perform a pressure test on the bogie cartridge. Fill to the point where the pressure gauge reads not more than 138 kPa (20 psi). Observe pressure for 10 seconds. If there is a pressure drop of 2.5 percent or less than 3.5 kPa (0.5 psi), the cartridge seals are acceptable. Fill with Cat FDAO Syn. Put a 6Y-0473 Clear Plug in the rubber stopper. See Illustration 6

Illustration 7	g02195383
If oil leaks out between the bogie and track roller frame during the pressure test a seal is leaking.

If a seal is leaking in the bogie cartridge pin, the pressure will drop off. Oil will run out between the bogie and the track roller frame as shown in Illustration 7. Pins that have leaking seals must be replaced as soon as possible to prevent major damage to the bogie and track roller frame bores.

If a pin must be replaced, while the pin is out of the track roller frame, check the pin bore sizes. A minimum of 0.05 mm (0.002 inch) press fit between the pin and bore must exist. SeeIllustration8 If the maximum pin bore measurement is greater than the pin diameter minus (-) 0.05 mm (0.002 inch), yet some press fit exist, immediate repair is not necessary. Install a new bogie cartridge pin and recondition the bogie pin bores at the next scheduled track roller frame reconditioning.

Illustration 8	g02793556
Critical Cartridge Pin Bores of the Track Roller Frame and Bogie Assemblies (A) Inner Cartridge Pin Bore (B) Bogie Cartridge Pin Bore (C) Outer Cartridge Pin Bore

If there is no press fit, the pin bore must be reconditioned. For the correct reconditioning procedures refer to Undercarriage Reconditioning Bulletin, REHS1757, "Rebuild Guidelines for the Suspended Undercarriage". Replacement bogie cartridge pin bore assemblies are laser welded between the inner and outer bushings and the ends of the pin. If the Bogie Cartridge Pin assembly leaks, replace the Cartridge Pin assembly. The Bogie Cartridge Pin assembly is not serviceable.

Inspection Intervals

The recommended inspection interval for bogie cartridge pins will vary depending on the severity of the machine application. Inspections should be performed often enough to identify and repair pins before major damage occurs to the track roller frame and bogie bores. As a general guideline, for machines operating in high impact conditions, perform an initial inspection at 4000 SMU (service meter units or hours of service operation) and other inspections each 2000 SMU there after. In low impact conditions, perform inspections at the time of major undercarriage work or a minimum of 5000 SMU. For machines operating in ideal conditions inspect the pins at a maximum of 9000 SMU. Inspections will help to spot worn or damaged parts before problems can develop into major and costly repairs.

A form similar to the one shown, can be used to record bogie cartridge pin inspections.

To keep inspections the same on each machine, the #1 bogie should be the one toward the front of the machine. The #4 bogie will be the one toward the rear of the machine.