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Electrical System Section 4 – Troubleshooting Information
No Telescope Extend
NOTE
Boom Down may be disabled by the dual load zone system and/or overload system if equipped. Please first
ensure the boom is fully retracted and there are no faults in the overload system.
1. Loose or broken wire #10A from ignition/ pump
switch S5 to telescope switch S14.
Check continuity. Replace if defective.
2. Defective telescope switch S14. Check continuity through switch while activating
extend function between wires #10A and #39. If no
continuity found, replace switch.
3. Loose or broken wire #39 from telescope switch
S14 to base terminal block.
Check continuity. Replace if defective.
4. Loose or broken wire #39 from base terminal
block to turret harness plug pin #13.
Check continuity. Replace if defective.
Follow steps on No Boom Telescope Extend
Function from Base or Platform Consoles.
No Platform Rotate Left
1. Loose or broken wire #10A from ignition/ pump
switch S5 to platform rotate switch S16.
Check continuity. Replace if defective.
2. Defective platform rotate switch S16. Check continuity through switch while activating
rotate left function between wires #10A and #36. If
no continuity found, replace switch.
3. Open or defective diode D36-1. Check diode. Replace if defective.
4. Loose or broken wire #37A from diode D36-1 to
resistor R1.
Check continuity. Replace if defective.
5. Loose or broken wire #36 from platform rotate
switch S16 to base connector plug A pin #18.
Check continuity. Replace if defective.
6. Loose or broken wire #36 in boom cable A or its
connectors.
Check for continuity between pins #18 on cable A.
Check for loose or corroded connections on cable
connectors. Replace if wire is defective.
7. Loose or broken wire #36 plug A pin #18 to
platform terminal block.
Check continuity. Replace if defective.
8. Loose or broken wire #36 from platform terminal
block to platform rotate left valve 4H-36.
Check continuity. Replace if defective.
9. Loose or broken wire #02 from platform terminal
block to platform rotate left valve 4H-36.
Check continuity. Replace if defective.
10. Defective platform rotate left valve coil 4H-36. Check continuity and resistance through coil.
Replace if defective.
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