Hydraulic System Pressure Test
- Disconnect pressure tube at power steering gear. Connect gauge side of pressure gauge to pressure line from power steering pump. Connect valve side of pressure gauge to pressure line to steering gear.
- Bleed system. See HYDRAULIC SYSTEM BLEEDING under LUBRICATION. Warm power steering fluid to at least 176°F (80°C). With engine at idle, close pressure gauge valve. Observe gauge. DO NOT keep valve closed longer than 10 seconds. If pressure is less than specified in POWER STEERING PUMP PRESSURE , repair or replace power steering pump.POWER STEERING PUMP PRESSURE
Model psi (kg/cm2 ) SC300 1100 (75) - If pressure is as specified, open valve fully. Measure and record pressure at 1000 RPM and 3000 RPM. Difference in measurements should be less than 71 psi (5 kg/cm2 ). If difference is greater than 71 psi (5 kg/cm2 ), repair or replace flow control valve.
- With gauge valve fully open and engine idling, rotate steering wheel to full lock. Observe gauge. Steering gear is leaking internally if pressure is less than specified in POWER STEERING PUMP PRESSURE . Repair or replace as required.