Isuzu — Power Steering System Test
Testing & diagnosis · Power steering pump / gear
From a Isuzu service manual — check it applies to your exact model before use.
Browse Isuzu generators & specs →
Before you start
- Do not leave shutoff valve fully closed for more than 5 seconds, as the pump could become damaged internally.
Procedure
- Inspect pump reservoir fluid level, pump belt tension, pulley condition.
- With engine OFF, disconnect pressure hose at pump and install Power Steering tester; open shutoff valve.
- Fill reservoir to Full mark; start engine and momentarily hold wheel against stop; check connections for leakage.
- Bleed the system.
- Start engine; at normal operating temperature increase speed to 1500 rpm.
- Fully close shutoff valve and record highest pressure (do not leave closed more than 5 seconds).
- Leave valve open and turn wheel fully both directions; record highest pressures and compare.
- Shut off engine, remove tester, reconnect hose, check fluid level.
Tools required
- Power steering tester 5-8840-0135-0 (J-29877-A) Amazon
- Adapter 5-8840-2297-0 (For 6VD1, 6VE1, 4JX1) Amazon
- Adapter 5-8840-0136-0 (For 4JG2) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 6VD1/6VE1: 9300-9800 kPa (1350-1420 psi)
- 4JG2/4JX1: 9800-10300 kPa (100-105 Amazon eBay FridayParts $204.92 kg/cm2 / 1420-1490 psi)
Source: Isuzu service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.