308C CR Excavator Hydraulic System – Main Hydraulic Pump – Remove

Removal Procedure

Table 1
Required Tools    
Tool     Part Number     Description     Qty    
A     4C-8359     Eyebolt     1    
189-0408 Shackle     1    
B     6V-9508     Plug (11/16-16)     5    
6V-9509 Plug (13/16-16)     1    
6V-9510 Plug (1-14)     2    
6V-9511 Plug (1 3/16-12)     1    
6V-9829 Cap Assembly (11/16-16)     5    
6V-9830 Cap Assembly (13/16-16)     1    
6V-9831 Cap Assembly (1-14)     2    
6V-9832 Cap Assembly (1 3/16-12)     1    
5H-4018 Cover     1    

Start By:

  1. Remove the hood. Refer to Disassembly and Assembly Manual, “Hood – Remove and Install”.
  2. Release the pressure from the hydraulic system. Refer to Disassembly and Assembly, “Hydraulic System Pressure – Release”.


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


Keep all parts clean from contaminants.

Contamination of the hydraulic system with foreign material will reduce the service life of the hydraulic system components.

To prevent contaminants from entering the hydraulic system, always plug or cap the lines, fittings, or hoses as they are disconnected. Cover any disassembled components and clean them properly before assembly.

Clean the hydraulic system properly after any major component exchange or especially after a component failure, to remove any contamination.


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.

------ 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.


    Note: Some machines have an auxiliary hydraulic pump. This procedure includes removal instructions for that pump. When the machine is not equipped with an auxiliary hydraulic pump, disregard these steps.

  1. Drain the hydraulic tank into a suitable container for storage or for disposal. The capacity of the hydraulic tank is approximately 55 L (14.5 US gal). Refer to Operation and Maintenance Manual, SEBU7613, “Capacities (Refill)”.
    1. Remove the access panel that is located underneath the hydraulic oil tank. This allows access to the drain plug.

    Illustration 1 g00890740

    Right rear of machine

  1. Remove access cover (1) .

    Illustration 2 g00890770

  1. Disconnect hose assemblies (2) .

    Illustration 3 g00890865

  1. Disconnect hose assemblies (4) from oil filter base (3).
  1. Remove bolts (5). Position pilot oil filter base (3) out of the way.

    Illustration 4 g00896086

  1. Disconnect oil tube (6) .

    Illustration 5 g00896091

  1. Remove panel (7) .

    Illustration 6 g00896172

  1. Remove cover (8) .

    Illustration 7 g00896175

  1. Remove cover (9) .

    Illustration 8 g00896177

  1. Remove cover (10) .

    Illustration 9 g00896189

  1. Install Tooling (A). Use a suitable lifting device. The weight of the main hydraulic pump is approximately 70 kg (155 lb).
  1. Remove bolts (11) .
  1. Remove main hydraulic pump (12) .