COOLER GP-HYDRAULIC OIL 7E5794 - Caterpillar

Specifications
Table 1
Case Pressure (Steering Pump)    
Date     Equipment ID Code    
Item     Specification     Actual    
Rod end of lift cylinders    
27750 250 kPa (4025 36 psi) (1)        
Relief valve for rod end of left angle cylinder and head end of right angle cylinder    
34750 250 kPa (5040 36 psi) (1)        
Relief valve for rod end of right angle cylinder and head end of left angle cylinder    
Rod end of ripper cylinders    
( 1 ) Pressure at 5 L/min (1.3 US gpm)
Illustration 1 g01776914
Table 2
Torque Specifications    
Callout    Torque    
Locknut (6)    
20 2 N m (177 18 lb in)    Introduction
There is no main line relief valve. The load sensing relief valve acts as a relief valve in order to limit system pressure.The setting for the high-pressure stall test is 25210 450 kPa (3655 65 psi).The pressure compensator can be checked on the machine by running the high-pressure stall test.Required Tools
Table 3
Required Tools    
Part Number     Part Description     Qty    
288-6823     Manifold     1    Test Preparation - Relief Valve
Move the machine to a smooth horizontal location.
Place the steering control lever in the NEUTRAL position.
Engage the parking brake.
Lower the attachments to the ground.
Stop the engine.
Turn the key to the ON position, but do not start the engine.
Verify that the implement lockout switch is in the UNLOCKED position.
Move the control levers through the full range of travel several times. Note: Moving the control levers will relieve any pressure that may be present in the implement hydraulic system.
Make sure that the pressure in the entire hydraulic system has been released.
Turn the key to the OFF position.
Illustration 2 g01821053
(1) Relief valve for rod end of lift cylinders (2) Relief valve for rod end of left angle cylinder and head end of right angle cylinder (3) Relief valve for rod end of right angle cylinder and head end of left angle cylinder
Illustration 3 g01821055
(1) Relief valve for rod end of lift cylinders (2) Relief valve for rod end of left angle cylinder and head end of right angle cylinder (3) Relief valve for rod end of right angle cylinder and head end of left angle cylinder (4) Relief valve for rod end of ripper cylindersTest Procedure - Relief Valve
Note: Cleanliness is an important factor. Before you begin the disassembly procedure, clean the exterior of the components. Cleaning the components will help to prevent dirt from entering the system. Precision components can be damaged by contaminants or by dirt.
Remove the relief valve that requires testing.Bench Test
Install the relief valve into the 288-6823 Manifold .
Slowly increase pressure.
Record the pressure when the relief valve opens. Note: Refer to "Specifications".
Adjust the relief valve, if necessary.Note: Refer to "Adjustment Procedure - Relief Valve".Adjustment Procedure - Relief Valve
Illustration 4 g01776914
Line relief valve (5) Setscrew (6) Nut (7) Cap
Remove protective cap (7) .
Loosen locknut (6). Maintain the position of adjustment screw