Skyjack SJ85 AJ Service Manual

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SJ85 AJ 229044ADA
Electrical System Section 4 – Troubleshooting Information
4.2-10 No Platform Rotate
No Platform Rotate Right from Base:
1. Loose or broken wire #10C from resistor R1 to
R5.
Check continuity. Replace if defective.
2. Defective resistor R5. Check resistor, replace if defective.
3. Loose or broken wire #10F from resistor R5 to
platform rotate switch S16.
Check continuity. Replace if defective.
4. Defective platform rotate switch S16. Check continuity through switch while activating up
function between wires #10C and #37B. Replace
switch if no continuity.
5. Loose or broken wire #37B from platform rotate
switch S16 to plug A pin 19.
Check continuity. Replace if defective.
6. Loose or broken wire #37B in boom cable A or
its connectors.
Check continuity. Replace if defective.
7. Loose or broken wire #37B from plug A pin #19
to platform terminal block.
Check continuity. Replace if defective.
8. Loose or broken wire #37B from platform
terminal block to platform rotate right valve valve
4H-37B.
Check continuity. Replace if defective.
9. Loose or broken wire #02 from platform terminal
block to platform rotate right valve 4H-37B.
Check continuity. Replace if defective.
10. Defective platform rotate right valve coil 4H-37B. Check continuity and resistance through coil.
Replace if defective.
11. Open or defective diode D37-1. Check diode. Replace if defective.
No Platform Rotate Right from Platform Console:
1. Loose or broken wire #04 from platform terminal
block to platform level switch S20.
Check continuity. Replace if defective.
2. Defective platform level switch S20. Check continuity through switch while activating
function between wires #4 and #36A. Replace
switch if no continuity.
3. Loose or broken wire 37A from S21 to J3 pin #28
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 J2 pin #35 of the valve driver to
wire #37.
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 37 from J2 pin #35 of valve
driver to platform terminal strip.
Check continuity. Replace if defective.
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Skyjack SJ85 AJ Specifications

General

Brand	Skyjack
Model	SJ85 AJ
Category	Boom Lifts
Language	English