Hydraulic System Pressure Test
- With belt tension correct, disconnect power steering pump pressure hose. Keep hose end raised to prevent fluid loss. Connect pressure hose of gauge to power steering pump fitting. Connect other hose from valve side of tester to steering gear inlet.
- Open valve. Run engine until fluid reaches normal operating temperature of 170°F (77°C). Check fluid level. Add fluid if necessary.
- Note pressure reading with valve open and engine idling. Pressure should be less than 150 psi (11 kg/cm2 ). If pressure exceeds 150 psi (11 kg/cm2 ), check hoses for restrictions and poppet valve for proper assembly.
- Close and reopen gate valve completely 3 times. Record highest reading each time. DO NOT close valve longer than 5 seconds. Note if pressure is within specifications. See PRESSURE TEST SPECIFICATIONS table.
- If all readings are within specifications and 50 psi (3.5 kg/cm2 ) of each other, pump is operating properly.
- If readings exceed specifications or are not within 50 psi (3.5 kg/cm2 ) of each other, flow control valve in pump is sticking. Remove flow control valve. Clean or replace valve as necessary.
- If readings are below specifications, clean or replace flow control valve. If pressures are still low, replace pump.
- If readings are all within specifications, open valve, and turn steering wheel from right stop to left stop. Record pressure. DO NOT hold wheel against stops longer than 5 seconds.
- Compare both readings to pump output pressure reading obtained. Readings should be same as pump output pressure. If readings are low, steering gear is leaking internally. Repair or replace as required.
PRESSURE TEST SPECIFICATIONS
| Application | Idle: psi (kg/cm2 ) | Relief: psi (kg/cm2 ) |
|---|---|---|
| Wrangler | Less Than 150 (11) | 1000-1100 (70-77) |
| All Others | Less Than 150 (11) | 1350-1450 (95-102) |