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VALVE BENCH TEST AND ADJUSTMENT
The following parts and test equipment will be
required to completely bench test and adjust the dual
control treadle valve. Differential pressure switch
operation can also be tested.
• Pressure gauges (3), 0-to-24 132 kPa (3,500
psi).
• Hydraulic pressure supply, regulated to 22 064
kPa (3,200 psi).
• Hydraulic test stand, Refer to Figure 3-9.
1. Motor
2. Pump
3. System Pressure Gauge
4. Needle Valve
NOTE: Shut off valves (8) for tests not requiring simulated brake loads, such as circuit tracking.
NOTE: B1 Cylinder must be capable of a 10 cubic inch maximum displacement.
NOTE: B2 Cylinder must be capable of a 20 cubic inch maximum displacement.
J03034
FIGURE 3-9. TEST BENCH SET UP
5. Needle Valve
6. Brake Valve
7. Front Brake Pressure Gauge
8. Shut Off Valves
Brake Circuit Component Service
• Hose fittings for valve ports:
Port PX is 7/16 in. - 4 SAE.
Ports P1, P2, B1 and B2 are 3/4 in. - 8 SAE.
Port T is 1 1/16 in. - 12 SAE.
• Ohmmeter
NOTE: It is possible to check the pressures with the
brake valve installed and connected to the vehicle.
Remove the brake pedal assembly and actuator cap
and boot assembly to adjust individual brake circuit
pressures.
9. Simulated Brake Volume
10. Rear Brake Pressure Gauge
11. Relief Valve
J3-13
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