Skyjack SJ85 AJ Service Manual

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SJ85 AJ229044ADA
Section 4 – Troubleshooting Information Electrical System
No Platform Level Down from Base Console:
1. Loose or broken wire #10C from resistor R1 to
platform level switch S15.
Check continuity. Replace if defective.
2. Defective platform level switch S15. Check continuity through switch while activating
up function between wires #10C and #40. Replace
switch if no continuity.
3. Loose or broken wire #40 from platform level
switch S15 to base terminal block.
Check continuity. Replace if defective.
4. Loose or broken wire #40 from base terminal
block to turret harness plug pin #15.
Check continuity. Replace if defective.
5. Loose or broken wire #38 from turret harness
plug pin #16 to platform down valve 4H-40.
Check continuity. Replace if defective.
6. Loose or broken wire #02 from turret harness
plug to platform down valve 4H-40.
Check continuity. Replace if defective.
7. Defective platform down coil 4H-40. Check continuity and resistance through coil.
Replace if defective.
No Platform Level Down from Platform Console:
1. Loose or broken wire #04 from platform terminal
block to platform level switch S19.
Check continuity. Replace if defective.
2. Defective platform level switch S19. Check continuity through switch while activating
function between wires #4 and #40A. Replace
switch if no continuity.
3. Loose or broken wire 40A from S19 to J2 pin #26
of valve driver.
Check continuity. Replace if defective.
4. No output on J2 pin #24 of the valve driver to
wire #20B.
Check for 12 volts. If no voltage present with foot
on footswitch check section 5 for OCM pin voltage
reference.
5. No output on J3 pin #12 of the valve driver to
wire #40.
Check for a minimum 3.5 volts. If no voltage
present with foot on footswitch check section 5 for
OCM pin voltage reference.
6. Loose or broken wire #40 from valve driver J3
pin #12 to plug B pin #10 in platform control
console.
Check continuity. Replace if defective.
7. 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.
8. Loose or broken wire #40 from base connector
plug B pin #10 to base terminal block.
Check continuity. Replace if defective.
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Skyjack SJ85 AJ Specifications

General

Brand	Skyjack
Model	SJ85 AJ
Category	Boom Lifts
Language	English