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 hydrulic system. Refer to HYDRAULIC SYSTEM BLEEDING under LUBRICATION. 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 oil pump if pressure does not measure within specification. Refer to the 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) |