Hydraulic System Pressure Test
- Disconnect pressure hose from power steering pump. Attach Pressure Gauge (MB990662-01 ) and Adapters (MB990993-01 and MB990994-01 ). See Fig 1 . Tighten fittings to 22-29 ft. lbs. (30-39 N.m).
- Bleed system. See HYDRAULIC SYSTEM BLEEDING under LUBRICATION. Close gauge valve 3 times to bleed air from gauge. Start engine and let idle. Place thermometer in reservoir. Check fluid level. Add fluid as necessary.
- When fluid temperature reaches 131°F (55°C), check pressure. See POWER STEERING PUMP PRESSURE SPECIFICATIONS table. Reinstall pressure hose. Do not twist hose or let hose interfere with adjacent parts. Replace power steering pump if pressure is not within specification.
CAUTION:
DO NOT keep shutoff valve closed more than 3 seconds at a time. DO NOT keep steering wheel turned to full lock position for more than 10 seconds at a time.
POWER STEERING PUMP PRESSURE SPECIFICATIONS
| Application | psi (kg/cm2 ) |
|---|---|
| Valve Closed | 1067-1166 (75-82) |
| Valve Open (Standard) | 114-142 (8-10) |
| Valve Open (Limit) | 213 (15) |