PROTECTOR 0878428 - Caterpillar

Table 4
Relief Valve    Pressure Change With One Turn Of Adjustment Screw    
Main relief valve    
14400 kPa (2100 psi)    
Crossover relief valves    
3050 kPa (440 psi)    Note: Pressure values in Table 4 are approximate values. Use a pressure gauge for adjustment.
Illustration 4 g02240859
Travel brake valve (left side) (5) Locknut (6) Adjustment screw (7) Crossover relief valve (forward left travel) (8) Crossover relief valve (reverse left travel) (9) Locknut (10) Adjustment screw
Mark the original position of the right forward travel crossover relief valve.
Loosen the locknut for the right forward travel crossover relief valve. Turn the adjustment screw clockwise by one half turn. Tighten the locknut.
Illustration 5 g03328754
(D) Track block (3) Sprocket
Place track block (D) in sprocket (3) in order to block forward right travel.
Start the engine.
Place the hydraulic activation control lever in the UNLOCKED position.
Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings.
Increase the hydraulic oil temperature to 55° 5°C (131° 9°F).
Slowly move the right travel control lever to full FORWARD position.
Check the main relief valve pressure setting at pressure tap (2) . The main relief valve pressure setting should be 35000 500 kPa (5076 73 psi).
Illustration 6 g02102305
Main relief valve (A) Adjustment screw (L) Locknut
Illustration 7 g02102306
Main relief valve (heavy lift) (A) Adjustment screw (L) Locknut
Loosen the locknut. Set the temporary main relief pressure to 37500 500 kPa (5439 73 psi). Tighten the locknut.Note: Turn the adjustment screw clockwise in order to increase the pressure. Turn the adjustment screw counterclockwise in order to decrease the pressure.Note: Always make final pressure adjustments on pressure rise.
Illustration 8 g03261818
Sprocket (left travel) (D) Track block (4) Sprocket
Place track block (D) in sprocket (4) in order to block forward left travel.
Slowly move the left travel control lever to full FORWARD position.
Check the pressure setting of the left forward travel crossover relief.
Loosen the locknut of the left forward travel crossover relief valve. Turn adjustment screw of the left forward travel crossover relief valve until the pressure reading at pressure tap (1) is 35000 kPa (5076 psi).
Slowly move the left travel control lever to full FORWARD position.
Check the pressure setting of the left forward travel crossover relief.
Loosen the locknut of the left forward travel crossover relief valve. Turn adjustment screw of the left forward travel crossover relief valve until the pressure reading at pressure tap (1) is 37500 500 kPa (5439 73 psi).Note: Turn the adjustment screw clockwise in order to increase the pressure. Turn the adjustment screw counterclockwise in order to decrease the pressure.Note: In order to prevent over setting, the adjustment should be stopped immediately after the pressure becomes within specification.
Remove track block (D) from sprocket (4) .
Place track block (D) in sprocket in order to block reverse left travel.
Slowly move the left travel control lever to full REVERSE position.
Check the pressure setting of