Power Steering System Test - Isuzu 2000 Trooper Workshop Manual

Power Steering System Test

Test Procedure
Legend
(1) Bolt (M16 1.5)
(2) Hose (Vehicle Side)
Test of fluid pressure in the power steering system is
performed to determine whether or not the oil pump and
power steering unit are functioning normally.
The power steering system test is the method used to
identify and isolate hydraulic circuit difficulties. Prior to
performing this test, the following inspections and
corrections, if necessary, must be made.
D Inspect pump reservoir for proper fluid level.
D Inspect pump belt for proper tension.
D Inspect pump driver pulley condition.
1. Place a container under the pump to catch the fluid
when disconnecting or connecting the hoses.
2. With the engine NOT running,disconnect the
pressure hose at the power steering pump and install
power steering tester J-29877-A. The gauge must be
between the shutoff valve and pump.
shutoff valve.
3. Check the fluid level. Fill the reservoir with power
steering fluid, to the "Full" mark. Start the engine,
then turn the steering wheel and momentarily hold it
against a stop (right or left). Turn the engine off and
check the connections at tester for leakage.
(3) To Power Steering Gear
(4) To Power Steering Pump
4. Bleed the system. Refer to Bleeding the Power
Steering System in this section.
5. Start the engine and check the pump fluid level. Add
power steering fluid if required. When the engine is at
normal operating temperature, increase engine
speed to 1500 rpm.
CAUTION: Do not leave shutoff valve fully closed
for more than 5 seconds, as the pump could become
damaged internally.
6. Fully close the shutoff valve. Record the highest
pressures.
D If the pressure recorded is within 9300–9800 kPa
(1350–1420 psi), the pump is functioning within its
specifications.
D If the pressure recorded is higher than 9800 kPa
Open the
(1420 psi), the valve in the pump is defective.
D If the pressure recorded is lower than 9300 kPa
(1350 psi), the valve or the rotating group in the
pump is defective.
POWER ASSISTED SYSTEM 2A–11
F02RX001