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Electrical System Section 4 – Troubleshooting Information
No Boom Down
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 boom switch S12.
Check continuity. Replace if defective.
2. Defective boom switch S12. Check continuity through switch while activating
down function between wires #10B and #13. If no
continuity found, replace switch.
3. Loose or broken wire #13 from boom down
switch S12 to base terminal block.
Check continuity. Replace if defective. Follow
steps on No Boom Down Function from Base or
Platform Consoles.
No Turret Rotate Left
1. Loose or broken wire #10A from ignition/ pump
switch S5 to resistor R2.
Check continuity. Replace if defective.
2. Open resistor R2. Check resistor for 7 ohms. If no resistance found,
replace resistor.
3. Loose or broken wire #10B from resistor R1 to
turret rotate switch S13.
Check continuity. Replace if defective.
4. Defective turret rotate switch S13. Check continuity through switch while activating
rotate left function between wires #10B and #32. If
no continuity found, replace switch.
5. Loose or broken wire #32 from turret rotate
switch S13 to base terminal block.
Check continuity. Replace if defective.
6. Loose or broken wire #32 from base terminal
block to turret harness plug pin #10.
Check continuity. Replace if defective.
7. Loose or broken wire #32 from turret harness
plug pin #10 to turret rotate left valve 4H-32.
Check continuity. Replace if defective.
8. Loose or broken wire #02 from turret harness
plug to turret rotate left valve 4H-32.
Check continuity. Replace if defective.
9. Defective turret rotate left valve coil 4H-32. Check continuity and resistance through coil.
Replace if defective.
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