TUBE AS 9R8669 - Caterpillar

Table 1
Required Tools    
Part Number    Part Description    Qty    
8T-0859     Pressure Gauge (0 to 25,000 kPa (0 to 3,600 psi))     1    
6V-3989     Fitting (TEST)     1    
6V-4143     Quick Connect Coupler     2    
6V-3014     Hose As     1    
Prior to any adjustment, refer to the "Preparations" section in Testing and Adjusting, "Operational Checks".Test and Adjust for the Secondary Line Relief Valve
Illustration 1 g01256501
The remote pressure taps are located behind the left rear access door. (1) Pressure tap (Pilot, brake, auxiliary tool, and steering pump)
Illustration 2 g01204468
Medium Pressure Control Valve (2) Primary line relief valve (3) Secondary line relief valve
Connect a 25000 kPa (3600 psi) pressure gauge to pressure tap (1) .
Start the engine.
Adjust the engine speed to HIGH IDLE by turning the engine speed dial to position 10.
To check the setting of secondary line relief valve (3) for the medium pressure function, you must apply an external pressure to the circuit. This is accomplished by using an external pump or by loading an adjustable ditch cleaning bucket by pressing one corner of the bucket to the ground in order to apply pressure to this circuit from outside.
Measure the opening point (pressure drop point) in the circuit on an external pressure tap.
Allowable secondary line relief valve pressure is 22000 kPa (3191 psi) maximum. Allowable pump pressure is 20000 kPa (2901 psi) maximum.
To adjust the pressure on the secondary line relief valve, loosen the locknut on secondary line relief valve (3). Turn the adjustment screw clockwise in order to increase the pressure setting. Turn the adjustment screw counterclockwise in order to decrease the pressure setting.Note: Always make the final