Skyjack SJ85 AJ Service Manual

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SJ85 AJ229044ADA
Section 4 – Troubleshooting Information Electrical System
4.2-7 No Telescope
No Telescope In from Base Console:
1. Loose or broken wire #10C from resistor R1 to
boom switch S14.
Check continuity. Replace if defective.
2. Defective telescope switch S14. Check continuity through switch while activating
up function between wires #10C and #38. Replace
switch if no continuity.
3. Loose or broken wire #38 from telescope switch
S14 to base terminal block.
Check continuity. Replace if defective.
4. Loose or broken wire #38 from base terminal
block to turret harness plug pin #13.
Check continuity. Replace if defective.
5. Loose or broken wire #38 from turret harness
plug pin #13 to telescope in valve 4H-38.
Check continuity. Replace if defective.
6. Loose or broken wire #02 from turret harness
plug to telescope in valve 4H-38.
Check continuity. Replace if defective.
7. Defective telescope in coil 4H-38. Check continuity and resistance through coil.
Replace if defective.
No Telescope In from Platform Console:
1. Loose or broken wire #04 from platform terminal
block to telescope switch S18.
Check continuity. Replace if defective.
2. Defective telescope switch S18. Check continuity through switch while activating
function between wires #4 and #38A. Replace
switch if no continuity.
3. Loose or broken wire 38A from S18 to J2 pin #21
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 #9 of the valve driver to wire
#38.
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 #38 from valve driver
J2 pin #9 to plug B pin #8 in platform control
console.
Check continuity. Replace if defective.
7. Loose or broken wire #38 in boom cable B or its
connectors.
Check for continuity between pins #8 on cable B.
Check for loose or corroded connections on cable
connectors. Replace if wire is defective.
8. Loose or broken wire #38 from base connector
plug B pin #8 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