308C CR Excavator Hydraulic System – Gear Pump (Pilot) – Remove

Removal Procedure

------ WARNING! ------

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 work tools have been lowered to the ground, 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 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 Tools and Shop Products Guide” for tools and supplies suitable to collect and contain fluids on Caterpillar products.

Dispose of all fluids according to local regulations and mandates.

Note: Put identification marks on all hose assemblies for installation purposes. Plug all hose assemblies. This helps to prevent fluid loss, and this helps to keep contaminants from entering the system.

  1. Release the pressure in the hydraulic system. Refer to Operation and Maintenance Manual, SEBU7421, “Hydraulic System Pressure – Release”.

    Illustration 1 g00877725

  1. Disconnect hose assemblies (1) and (2) .
  1. Remove bolts (3) and remove pilot pump (4) .

    Illustration 2 g00883400

  1. Remove coupling (5) from the auxiliary pump.