Skyjack SJ85 AJ Service Manual

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SJ85 AJ229044ADA
Section 4 – Troubleshooting Information Electrical System
No Jib Down from Base:
1. Loose or broken wire #10C from resistor R1 to jib
switch S17.
Check continuity. Replace if defective.
2. Defective jib switch S17. Check continuity through switch while activating up
function between wires #10C and #34B. Replace
switch if no continuity.
3. Loose or broken wire #34B from jib switch S17 to
plug A pin 16.
Check continuity. Replace if defective.
4. Loose or broken wire #34B in boom cable A or
its connectors.
Check continuity. Replace if defective.
5. Loose or broken wire #34B from plug A pin #16
to platform terminal block.
Check continuity. Replace if defective.
6. Loose or broken wire #34B from platform
terminal block to jib up valve 4H-34B.
Check continuity. Replace if defective.
7. Loose or broken wire #02 from platform terminal
block to jib up valve 4H-34B.
Check continuity. Replace if defective.
8. Defective jib up valve coil 4H-34B. Check continuity and resistance through coil.
Replace if defective.
9. Open or defective diode D34-1. Check diode. Replace if defective.
No Jib Down from Platform Console:
1. Loose or broken wire #04 from platform terminal
block to platform level switch S21.
Check continuity. Replace if defective.
2. Defective platform level switch S21. Check continuity through switch while activating
function between wires #4 and #34A. Replace
switch if no continuity.
3. Loose or broken wire 34A from S21 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 J2 pin #8 of the valve driver to wire
#34.
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 34 from J2 pin #8 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