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. Differrential pressure switch operation
can also be tested.
• Pressure gauges (3), 0-to-3500 psi (24 132 kPa).
• Hydraulic pressure supply, regulated to 3200 psi
(22 064 kPa).
• Hydraulic test stand, Refer to Figure 3-10.
• 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.
FIGURE 3-10. TEST BENCH SET UP
1. Motor
2. Pump
3. System Pressure Gauge
4. Needle Valve
9. Simulated Brake Volume
10. Rear Brake Pressure Gauge
11. Relief Valve
5. Needle Valve
6. Brake Valve
7. Front Brake Pressure Gauge
8. Shut Off Valves
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.
J3-10 Brake Circuit Component Service J03022 1/99
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