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Introduction
This special instruction covers the improved procedure to install the rear engine mounts on AD55B S/N:JNW1-UP Underground Articulated Trucks. This supplemental product support literature should be used with the appropriate Service Manual and the appropriate Parts Manual that is available for this standard machine.Read the entire Special Instruction. Understand the information before you perform any procedures. Understand the information before you order any parts.Safety Section
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 in order 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.Ensure that all personnel are safe when using a tool, procedure, work method, or operating technique not recommended by Caterpillar. Ensure that the product will not be damaged or the product made unsafe by the operation, lubrication, maintenance, or the repair procedures that are used.
Personal injury or death can result from machine articulation or movement. Machine frames can move and a person can be crushed. Connect the steering frame lock between the front and rear frames before working on the machine.Before operating the machine, place the steering frame lock in the stored position.Failure to place the steering frame lock into the stored position before operating can result in loss of steering.
Hot oil and components can cause personal injury.Do not allow hot oil or components to contact skin.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
ReferenceOperation and Maintenance Manual, SEBU7336, "AD55B Underground Articulated Truck".ReferenceDisassembly and Assembly, KENR6709, "AD55B Underground Articulated Truck Machine Systems".ReferenceDisassembly and Assembly, KENR6707, "AD55B Underground Articulated Truck C27 Engine Supplement".Parts Required
Table 1
QTY     Part Number     Description    
2     370-2573     Mount As    
5     1H-9696     O-Ring Seal    
1     2H-6338     O-Ring Seal    
6     4J-0520     O-Ring Seal    
10     4J-0524     O-Ring Seal    
2     4J-0527     O-Ring Seal    
2     5H-5672     O-Ring Seal    
4     7M-8485     O-Ring Seal    Procedure
Note: Cleanliness is an important factor. Before the removal procedure, clean the exterior of the component thoroughly. Cleaning the exterior will help to prevent dirt from entering the internal mechanism.Note: Put identification marks on all lines, on all hoses, on all wires, and on all tubes for installation purposes. Plug all lines, hoses, and tubes will prevent fluid loss and contaminants from entering the system.
Move the machine to a hard level surface away from operating machines and personnel.
Engage the parking brake. Place wheel blocks in front of the wheels and behind the wheels.
Stop the engine.
Connect the steering frame lock. Refer to, "Steering Frame Lock - Separate and Connect" for the machine being serviced.
Turn the key start switch and the battery disconnect switch to the OFF position.
Remove the engine and torque converter updrive gears. Refer to Disassembly and Assembly, "Engine and Torque Converter Updrive Gears - Remove" for the machine being serviced.Note: The procedure to install the improved rear engine mounts must be carried out with the engine removed from the machine. Premature failure of the rear engine mounts may result if the procedure is not followed.
Illustration 1 g02196393
Remove six bolts (2) and the washers. Retain for installation purposes.
Remove support (1) .
Remove and discard the 6Y-2090 Mount As from support (1) .
Illustration 2 g02317515
Example for the installation of the 370-2573 Mount As
Install the 370-2573 Mount As to support (1) .Note: Ensure the plate as indicated in Illustration 2 is equal to or greater than the diameter of the 370-2573 Mount As .
Install support (1) .
Install six bolts (2) and the washers retained in Step 7.
Illustration 3 g02196413
Remove six bolts (3) and the washers. Retain for installation purposes.
Remove suppor