Hydraulic System Pressure Test
CAUTION:
DO NOT leave valve on pressure gauge closed longer than 10 seconds, or damage to oil pump will result.
- Disconnect pressure hose from oil pump. Install Pressure Gauge (MB990662-01 ). See Fig 1 . Bleed air from system. See HYDRAULIC SYSTEM BLEEDING . Start engine, and let it idle. Turn steering wheel several times until temperature reaches 122°F (50°C). Set engine idle speed to 1000 RPM.
- Close and open valve to measure oil pump pressure. Replace pump if pressure is not within specification. See OIL PUMP PRESSURE SPECIFICATIONS table. Install pressure hose. Bleed system.
OIL PUMP PRESSURE SPECIFICATIONS
| Application | psi (kg/cm2 ) |
|---|---|
| Valve Closed | 1067-1166 (75-82) |
| Valve Open | 114-142 (8-10) |