Hydraulic System Pressure Test
- With belt tension correct, disconnect power steering pump pressure hose. Keep hose end raised to prevent fluid loss. Install Pressure Tester (6815) between power steering pump and steering gear.
- 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 125 psi (9 kg/cm2 ). If pressure exceeds 125 psi (9 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 3 seconds. Note if pressure is within specification. See PRESSURE TEST SPECIFICATIONS table.
- If all readings are to specification and within 50 psi (3.5 kg/cm2 ) of each other, pump operation is normal.
- If readings exceed specification or are not within 50 psi (3.5 kg/cm2 ) of each other, flow control valve in pump is sticking. Replace pump.
- If readings are less than specification, clean or replace flow control valve. If pressures are still low, replace pump.
- If readings are all within specification, open valve and turn steering wheel from right stop to left stop. Record pressure. DO NOT hold wheel against stops longer than 3 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 Pressure psi (kg/cm2 ) | Relief Pressure psi (kg/cm2 ) |
|---|---|---|
| All Models | Less Than 125 (9) | 1400 (98) |