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Electrical System Section 4 – Troubleshooting Information
4. Loose or broken wire 15 from valve driver J2 pin
#2 to plug B pin #4.
Check continuity. Replace if defective.
5. Loose or broken wire #15 in cable B or its
connectors.
Check for continuity between pins #4 on cable B.
Check for loose or corroded connections on cable
connectors. Replace if wire is defective.
6. Loose or broken wire #15 from base plug B pin
#5 to drive pump valve connector pin #1.
Check continuity. Replace if defective.
7. Loose or broken wire #15 from drive pump valve
connector pin #1 to 4H-15 Reverse coil.
Check continuity. Replace if defective.
8. Loose or broken wire #02 wire from 4H-15
Reverse coil to ground.
Check continuity. Replace if defective.
9. Defective reverse coil 4H-15. Check continuity and resistance through coil.
Replace if defective.
No Left Steer:
1. Loose or broken wire #24 from drive joystick A2
to valve driver connector J2 pin #15.
Check continuity. Replace if defective.
2. No output from valve driver on connector J3 pin
#13.
Check pin #13 for 12 volts. If no voltage present
with foot on footswitch and activating steer function
check section 5 for OCM pin voltage reference.
3. Loose or broken wire #24A from valve driver
connector J3 pin #13 to plug A pin #10.
Check continuity. Replace if defective.
4. Loose or broken wire #24A in boom cable A or
its connectors.
Check for continuity between pins #10 on cable A.
Check for loose or corroded connections on cable
connectors. Replace if wire is defective.
5. Loose or broken wire #24A from base terminal
block to turret harness plug pin #7.
Check continuity. Replace if defective.
6. Loose or broken wire #24A or #02 from turret
harness plug to left steer valve 4H-24A.
Check continuity. Replace if defective.
7. Defective left steer valve coil 4H-24A. Check continuity and resistance through coil.
Replace if defective.
No Right Steer:
1. Loose or broken wire #23 from drive joystick A2
to valve driver connector J2 pin #16.
Check continuity. Replace if defective.
2. No output from valve driver on connector J3 pin
#3.
Check pin #3 for 12 volts. If no voltage present
with foot on footswitch and activating steer function
check section 5 for OCM pin voltage reference.
3. Loose or broken wire #23A from valve driver
connector J3 pin #3 to plug A pin #9.
Check continuity. Replace if defective.
4. Loose or broken wire #23A in boom cable A or
its connectors.
Check for continuity between pins #9 on cable A.
Check for loose or corroded connections on cable
connectors. Replace if wire is defective.
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