RETAINER-SEAL 7D2889 - Caterpillar

Personal injury or death can result from sudden machine movement.Sudden movement of the machine can cause injury to persons on or near the machine.To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.
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, 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 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.
Operational Checks
Note: The checks during operation can be used to find leakage in the system. These checks can also be used to find a bad valve, a bad pump, or a bad motor. Travel speed can be used to check the condition of the propel motors and the pump.Operate the machine in each direction and in all speeds.
Watch the drum.
Starting and stopping operations should be progressive.
The drum rotation should be normal at all times.
Check for noise from the pump and drive motors.
Check for the sound of the relief valves that are opening. The opening pressures of the relief valves are given in Systems Operation Test and Adjust, "Relief Valve (Main) - Test and Adjust" and Systems Operation Test and Adjust, "Relief Valve (Charge) - Test and Adjust" of this module.
After the travel speed of the compactor is selected, the forward and reverse motion should be identical.Probable Causes of Problems in the Propel System
ProblemThe propel system operates in one direction only.Probable Cause
One of the main relief valves is damaged or out of adjustment.
The pump servo valve has failed .
The pump servo piston has failed.
The rocker arm section of the pump swashplate assembly has failed.
The flushing valve spool in the propel motor is sticking.
Malfunction of the swashplate assembly.ProblemThe propel system does not disengage when the propel control lever is returned to neutral. Probable Cause
The pump servo feedback mechanism has failed.
The pump servo piston has failed.
The swashplate is stuck in the stroked position.
The neutral adjustment of the servo valve is incorrect.
The neutral adjustment of the servo piston is incorrect.ProblemThe parking brake does not release when the parking brake switch is in the OFF position. Probable Cause
The parking brake switch has failed.
There is a malfunctioning piston seal in the brake group.
The parking brake valve has failed.
There is a fault in the