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SJ30AJE, SJ30ARJE 196274AF
Electrical System Section 4 – Troubleshooting Information
4.2-37 No Manual Platform Level Down from Platform Control Console
1. No output on pin #6 of the valve driver to
platform level switch S12 on wire #40B.
Check pin #6 for 12 volts. If no voltage present with
foot on footswitch check section 5 for OCM pin
voltage reference.
2. Defective platform leveling switch S12. Check continuity through switch while activating
level down function between wires #40B and #40.
3. Loose or broken wire #40 from platform level
switch S12 to platform terminal block.
Check continuity. Replace if defective
4. Open or defective diode D40. Check diode. Replace if defective.
5. Loose or broken wire #40A from platform
terminal block to valve driver pin #18.
Check for 12 volts at pin #18. Check continuity.
Replace if defective.
6. No output on pin #23 of the valve driver to wire
#20A.
Check pin #23 for proportional voltage. This
voltage varies with the A3 boom speed control. If
no voltage present with foot on footswitch check
section 5 for OCM pin voltage reference.
7. Loose or broken wire #40 from platform terminal
block to plug B pin #10 in platform control
console.
Check continuity. Replace if defective
8. Loose or broken wire #40 in boom cable B or its
connectors.
Check for continuity between pins #10 on cable B.
Check for loose or corroded connections on cable
connectors. Replace if wire is defective.
9. Loose or broken wire #40 from base connector
plug B pin #10 to base terminal block.
Check continuity. Replace if defective
10. Loose or broken wire #40 from base terminal
block to main manifold harness.
Check continuity. Replace if defective
11. Loose or broken wire #40 from main manifold
harness to platform level down valve 4H-40.
Check continuity. Replace if defective
12. Loose or broken wire #02 from main manifold
harness to platform level down valve 4H-40.
Check continuity. Replace if defective
13. Defective platform level down coil 4H-40. Check continuity and resistance through coil.
Replace if defective
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