Power Steering General Servicing: Testing
NOTE:
Before testing power steering system, check fluid level, belt tension, pump pulley, tire pressure and engine idle speed.
- Remove high pressure line from pump and attach Adapter Fitting (J-5176-11) to pump. Using Pressure Gauge (J-5176-02) and Adapter (J-5176-12), connect gauge to hose.
- Open valve fully. Run engine until fluid reaches normal operating temperature. Check fluid level and add as necessary. With engine at operating temperature, pressure reading should be 80-125 psi (5.6-8.8 kg/cm2
). If pressure is more than 200 psi (14 kg/cm2
), inspect system for restrictions or faulty flow control valve.CAUTION: To prevent pump damage, DO NOT hold valve closed for more than 5 seconds in step 3).
- Alternately close and open gauge valve fully 3 times while recording highest pressure obtained. Each reading should be at least 1000 psi (70.3 kg/cm2 ) or 1250 psi (87.9 kg/cm2 ) on TC series pumps. TC series pumps can be identified by a square shaped reservoir on side of pump.
- If recorded pressures are all within 50 psi (3.5 kg/cm2 ), pump is okay. If pressures are high and not within 50 psi (3.5 kg/cm2 ) of each other, flow control valve is sticking.
- If pressure readings are less than 1000 psi (70.3 kg/cm2 ) or 1250 psi (87.9 kg/cm2 ) on TC series pumps, replace flow control valve and retest pump pressure.
- If pump meets specification, leave valve open. Turn steering wheel from stop to stop. Record and compare highest pressure with maximum pump pressure.
- If pressure at both stops is not similar to maximum pressure, steering gear is leaking internally.
POWER STEERING PUMP PRESSURE TEST SPECS
| Application | Pressure: psi (kg/cm2 ) | |
|---|---|---|
| 4.5L | ||
| Idle | 80-125 (5.6-8.8) | |
| Relief | 1350-1450 (94.9-101.9) | |
| 5.0L & 5.7L | ||
| Idle | 80-125 (5.6-8.8) | |
| Relief | 1000-1250 (70.3-84.7) | |
| 5.0L Commercial | ||
| Idle | 80-100 (5.6-7.0) | |
| Relief | 1000-1250 (70.3-84.7) | |
| All Other Engines (TC Series Pump) | ||
| Idle | 80-125 (5.6-8.8) | |
| Relief | 1000-1250 (70.3-84.7) | |
POWER STEERING PUMP FLOW TEST SPECIFICATIONS
| Application | Flow: Gals./Min. (L/Min.) | |||
|---|---|---|---|---|
| 4.5L | ||||
| Minimum | 1.32 (5.0) | |||
| Maximum | 3.10 (11.8) | |||
| All Other Engines (TC Series Pump) | (1) | |||
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