FINAL DRIVE GP 1570930 - Caterpillar

Diesel engine exhaust contains products of combustion which may cause personal injury.Always start and operate the engine in a well ventilated area, and, if in an enclosed area, vent the exhaust to the outside.
Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the attachments have been lowered, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines.Dispose of all fluids according to local regulations and mandates.
Introduction
Contamination of the hydraulic oil could cause premature component failure. This procedure provides a method to determine if there is hydraulic system contamination.Required Tools
Table 1
Required Tools
Tool Item Qty Part No Description
A 1 169-8373 Fluid Sampling Bottle Test Preparation
Drive the machine to a smooth, horizontal surface.
Illustration 1 g06115138
Move propel lever (1) to the NEUTRAL position.
Move parking brake switch (2) to the ON position.
Move throttle switch (3) to operate the engine in the LOW-IDLE position.Test Procedure
Illustration 2 g06115308
Remove cap (4). Obtain an oil sample from the S O S tap. Refer to Special Instruction, SEBU6250, "SOS Oil Analysis" for information about obtaining a sample of the hydraulic oil. Replace the cap.
Illustration 3 g06115309
Allow the engine to idle for 5 minutes. Move engine start switch (5) to the OFF position.
Illustration 4 g06115311
Check hydraulic filter element (6) for foreign materials.
Bronze-colored particles indicate pump or motor piston slipper failure or port plate wear due to contamination.
Shiny steel particles indicate pump failure or motor piston failure.
Rubber particles indicate a seal failure or a hose failure.Note: If any of these particles are found in a hydraulic filter element, all components of the hydraulic oil system must be cleaned. Do not use any damaged parts. Any damaged parts must be removed, and new parts must be installed.
Replace hydraulic filter element (6).