Checking Hydraulic System

Checking Hydraulic System





Before starting, check belt tension, driving pulley and tire pressure.
1. Set Tool. Open shut-off valve, then bleed air.
2. Run engine at idle speed or 1,000 rpm.
^ Make sure fluid temperature in reservoir tank rises to 60 to 80°C (140 to 176°F).

WARNING: Warm up engine with shut-off valve fully opened. If engine is started with shut-off valve closed, fluid pressure in the power steering pump increases to maximum. This will raise fluid temperature abnormally.

3. Check pressure with steering wheel fully turned to left and right positions while idling at 1,000 rpm.
Power steering pump maximum operating pressure:
7,649 - 8,238 kPa (78 - 84 kg/cm2, 1109 - 1,194 psi) at idling

CAUTION: Do not hold the steering wheel at full lock position for more than 15 seconds.

^ If pressure reaches maximum operating pressure, system is OK.
^ If pressure increases above maximum operating pressure, check power steering pump flow control valve.
4. If power steering pressure is below the maximum operating pressure, slowly close shut-off valve and check pressure again.

CAUTION: Do not close shut-off valve for more than 15 seconds.

^ If pressure increases to maximum operating pressure, gear is damaged.
^ If pressure remains below maximum operating pressure, pump is damaged.
5. After checking hydraulic system, remove Tool and add fluid as necessary. Completely bleed air out of system.