CONTROL AR-BRAKE & STEERING 5C9374 - Caterpillar

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.
Do not attempt to check any of the following relief valves on the machine. If the pressure in the hydraulic system is increased in order to test the relief valves, the implement pump may become damaged.
Specifications
Table 1
Line Relief Valve Pressure Settings    
Item    Hydraulic Circuit    Pressure Setting    Actual    
1     Rod end of lift cylinders    
27750 250 kPa (4025 36 psi) (1)        
2     Relief valve for rod end of left angle cylinder and head end of right angle cylinder    
34750 250 kPa (5040 36 psi) (1)        
3     Relief valve for rod end of right angle cylinder and head end of left angle cylinder    
4     Rod end of ripper cylinders    
( 1 ) Pressure at 5 L/min (1.3 US gpm)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 2
Required Tools    
Part Number     Part Description     Qty    
288-6823     Manifold     1    Test Preparation
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.Valve Identification
Illustration 1 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 2 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 cylindersBench Test Procedure
Note: Cleanliness is an important factor. Before you begin the disassembly procedure, clean the exterior of the components. Cleaning the components will help