Load Compensator: Testing and Inspection

ON-VEHICLE INSPECTION





1. Set rear axle load.
Rear axle load (includes vehicle weight):
2WD
700 kg (1,543 lbs.)
4WD
850 kg (1,874 lbs.)





2. Install Load Sensing Proportioning & By-Pass Valve (LSP & BV) gauge Special Service Tool (SST) 09709-29018 or equivalent and bleed air.





3. Raise front brake pressure to 7,845 kPa (1,138 psi) and check rear brake pressure.
Rear brake pressure:
2WD
4,913 ± 490 kPa (713 ± 71 psi)
4WD
4,383 ± 490 kPa (636 ± 71 psi)

HINT: The brake pedal should not be depressed twice and/or returned while setting to the specified pressure. Read the value of rear brake pressure 2 seconds after adjusting the specified fluid pressure. If the brake pressure is incorrect, adjust the fluid pressure.





4. If necessary, adjust fluid pressure.
a. Adjust the length of the No.2 shackle.
Low pressure-Lengthen A
High pressure-Shorten A
Initial set:
2WD
78 mm (3.07 inch)
4WD
120 mm (4.72 inch)
Adjustment range:
2WD
72 - 84 mm (2.83 - 3.31 inch)
4WD
114 - 126 mm (4.49 - 4.96 inch)

HINT: One turn of the nut changes the fluid pressure as shown in the following table.

Rear brake pressure:
2WD
55 kPa (8.0 psi)
4WD
52 kPa (7.5 psi)





b. If the pressure cannot be adjusted by the No.2 shackle, raise or lower the valve body.
Low pressure-Lower body
High pressure- Raise body
c. Torque the nuts.
Torque: 13 Nm (9 ft. lbs.)
d. Adjust the length of the No.1 shackle again. If it cannot be adjusted, inspect the valve housing.





5. If necessary, check valve body.
a. Assemble the valve body in the uppermost position.

HINT: When the brakes are applied, the position will move down about 0.8 mm (0.03 inch). Even at this time, the piston should not make contact with or move the load sensing spring.





b. In this position, check the rear brake pressure.
2WD:
Front brake pressure
1,960 kPa (285 psi)
3,920 kPa (570 psi)
6,860 kPa (997.5 psi)
Rear brake pressure
1,960 kPa (285 psi)
2,450 ± 196 kPa (356 ± 28.5 psi)
3,190 ± 343 kPa (463 ± 50 psi)
4WD:
Front brake pressure
1,470 kPa (213.5 psi)
3,920 kPa (570 psi)
6,860 kPa (997.5 psi)
Rear brake pressure
1,470 kPa (213.5 psi)
1,960 ± 196 kPa (285 ± 28.5 psi)
2,550 ± 343 kPa (370.5 ± 50 psi)
If the measured value is not within standard, replace the valve body.