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Section 4 – Troubleshooting Information Electrical System
6. No output on pin #22 of the valve driver to wire
#14.
Check pin #22 for minimum 3.5 volts. If no voltage
present with foot on footswitch check section 5 for
OCM pin voltage reference.
7. Loose or broken wire #14 from valve driver pin
#22 to plug A pin #7 in platform control console.
Check continuity. Replace if defective.
8. Loose or broken wire #14 in boom cable A or its
connectors.
Check for continuity between pins #7 on cable A.
Check for loose or corroded connections on cable
connectors. Replace if wire is defective.
9. Loose or broken wire #14 from base connector
plug A pin #7 to base terminal block.
Check continuity. Replace if defective.
10. Loose or broken wire #14 from base terminal
block to turret harness plug pin #4.
Check continuity. Replace if defective.
11. Loose or broken wire #14 from turret harness
plug pin #4 to boom up valve 4H-14.
Check continuity. Replace if defective.
12. Loose or broken wire #02 from turret harness
plug to boom up valve 4H-14.
Check continuity. Replace if defective.
13. Defective boom up valve coil 4H-14. Check continuity and resistance through coil.
Replace if defective.
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 #04 from platform terminal
block to joystick controller A1.
Check continuity. Replace if defective.
2. Loose or broken wire #02 from platform terminal
block to joystick controller A1.
Check continuity. Replace if defective.
3. No output on y-axis of joystick controller A1. Refer to joystick test procedure in section 5.
4. Loose or broken wire “Y” from joystick controller
A1 to valve driver pin #29.
Check continuity. Replace if defective.
5. No output on pin #5 of the valve driver to wire
#20B.
Check pin #5 for 12 volts. If no voltage present with
foot on footswitch check section 5 for OCM pin
voltage reference.
6. No output on pin #8 of the valve driver to wire
#13.
Check pin #8 for minimum 3.5 volts. If no voltage
present with foot on footswitch check section 5 for
OCM pin voltage reference.
7. Loose or broken wire #13 from valve driver pin
#8 to plug A pin #6 in platform control console.
Check continuity. Replace if defective.
8. Loose or broken wire #13 in boom cable A or its
connectors.
Check for continuity between pins #6 on cable A.
Check for loose or corroded connections on cable
connectors. Replace if wire is defective.
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