SUPPORT AS-REAR-LH 1W6334 - Caterpillar

Introduction
The counterweight hydraulic circuit includes the following items: a gear pump, a counterweight control valve and a hydraulic cylinder. There is an adjustable relief valve in the body of the counterweight control valve. This test is used to ensure that the relief valve pressure is set properly in the counterweight control valve.Required Tools
Illustration 1 g01089423
Tooling (A)
Illustration 2 g01089425
Tooling (B) ( 6V-7830 Pressure Gauge (Tetragauge))
Table 1
Required Tools    
Tooling    Item    Part
Number    Description    Qty    
A     A1     8T-0852     Pressure Gauge
40000 kPa (5800 psi)     1    
A2 6V-3989     Fitting     1    
A3 6V-4143     Coupler     2    
A4 177-7861     Hose As
41370 kPa (6000 psi)     1    
B     B1     8T-0862     Pressure Gauge
500 kPa (72 psi)     1    
B2 8T-0860     Pressure Gauge
40000 kPa (5800 psi)     1    
B3 8T-0855     Pressure Gauge
4000 kPa (580 psi)     1    
B4 6V-3081     Hose As
41500 kPa (6020 psi)     1    
B5 4S-6399     Connector     1    
B6 6V-4144     Coupler     1    Test Procedure
Move the machine to a smooth horizontal location. Move away from working machines and personnel.
Allow only one operator on the machine. Keep all other personnel away from the machine or in the view of the operator.
Engage the parking brake.
Fully extend the counterweight.
Stop the engine.
Illustration 3 g01089262
Counterweight control lever (1) RETRACT (2) HOLD (3) EXTEND
Move the counterweight control lever to all three positions in order to release the pressure in the counterweight hydraulic circuit.
Remove the access panel that is just to the right of the operator's seat.
Illustration 4 g00490328
Pressure tap for the counterweight hydraulic circuit
Connect tooling (A or B) to the pressure tap for the counterweight hydraulic circuit. This pressure tap is located behind the access panel to the right of the operator's seat.
Start the engine. Warm the hydraulic oil to a temperature of 65° 3°C (149 ° 5 °F).
Operate the engine at HIGH IDLE.
Move the counterweight control lever to the RETRACT position.
Check the pressure at tooling (A or B). The pressure at tooling (A or B) should be 18100 200 kPa (2625 30 psi).
If the pressure at tooling (A or B) is not within the specified limits, perform the following adjustment procedure.Adjustment Procedure
Illustration 5 g01304478
Counterweight control valve (bottom view) (1) Adjustment screw
If the pressure is not correct, adjust the pressure by turning adjustment screw (1) on the counterweight relief valve. Turn the screw clockwise in order to increase pressure. Turn the screw counterclockwise in order to decrease pressure.