SEAL A 1002924 - Caterpillar

At operating temperature, the hydraulic oil is hot and under pressure. Hot oils can cause burns.To prevent possible personal injury, release the pressure in the work tool hydraulic circuit (boom, stick, bucket, and swing), travel circuits, and the hydraulic oil tank at the filler cap before any hydraulic lines or components are disconnected or removed.Remove the filler cap only when the engine is stopped and the filler cap is cool enough to touch.
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, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Illustration 1 g00726171
MP15, MP20, and MP30
Illustration 2 g00730125
MP40
Disconnect hose assembly (1).
Illustration 3 g00727816
Remove the two bolts and the washers that secure coupling (3) to the upper housing. Pull the coupling forward and disconnect the hose assembly from the rear of the coupling.
Install Tooling (A) in either direction between hose (1) and the hose from the rear of the coupling.
Start the host machine. Run the host machine at high idle and operate the implements until the hydraulic oil reaches normal operating temperature.
Rotate the work tool. Ensure that the direction of the rotation corresponds with the direction of flow of Tooling (A). Record the reading on the flow meter. Refer to Table 2 for the appropriate flow specification.
Table 2
Sales Model     Specifications for Flow Rate L/min (US gpm)    
MP15    
40 5 L/min (10.6 1.3 US gpm)    
MP20    
MP30    
MP40    
80 5 L/min (21.1 1.3 US gpm)    
Remove Tooling (A) from the work tool.
Ensure that the O-ring seals are properly positioned and connect the two hoses to the coupling.
Disconnect hose assembly (2). Refer to Illustration 1 or Illustration 2.
Remove the two bolts and the washers that secure coupling (4) to the upper housing. Pull the coupling forward and disconnect the hose assembly from the rear of the coupling. Refer to Illustration 3.
Install Tooling (A) in either direction between hose (2) and the hose from the rear of the coupling.
Start the host machine.
Rotate the work tool. Ensure that the direction of the rotation corresponds with the direction of flow of Tooling (A). Record the reading on the flow meter. Refer to Table 2 for the appropriate flow specification.
Remove Tooling (A) from the work tool.
Ensure that the O-ring seals are properly positioned and connect the two hoses to the coupling.
Refer to the list below for the corresponding results to the test:
If the flow was within the specification and the cycle times were not within the specification in either direction, the seals in the motor may be faulty. Check the gerotor motor for internal leakage. Refer to Service Manual, "Gerotor Motor Leakage - Test".
If the flow was within the specification and the