Skyjack SJ85 AJ Service Manual

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SJ85 AJ 229044ADA
Electrical System Section 4 – Troubleshooting Information
No Riser Down from Base Console:
1. Loose or broken wire #10C from resistor R1 to
resistor R3.
Check continuity. Replace if defective.
2. Defective resistor R3. Check resistor, replace if defective.
3. Loose or broken wire #10E from resistor R3 to
riser switch S25.
Check continuity. Replace if defective.
4. Defective riser switch S25. Check continuity through switch while activating
up function between wires #10E and #30. Replace
switch if no continuity.
5. Loose or broken wire #30 from riser switch S25
to base terminal block.
Check continuity. Replace if defective.
6. Loose or broken wire #30 from base terminal
block to turret harness plug pin #7.
Check continuity. Replace if defective.
7. Loose or broken wire #30 from turret harness
plug pin #7 to riser down valve 4H-30.
Check continuity. Replace if defective.
8. Loose or broken wire #02 from turret harness
plug to riser down valve 4H-30.
Check continuity. Replace if defective.
9. Defective riser down coil 4H-30. Check continuity and resistance through coil.
Replace if defective.
No Riser Down from Platform Console:
1. Loose or broken wire #04 from platform terminal
block to joystick controller A3.
Check continuity. Replace if defective.
2. Loose or broken wire #02 from platform terminal
block to joystick controller A3.
Check continuity. Replace if defective.
3. No output on R-Signal joystick controller A3. Refer to joystick test procedure in section 5.
4. Loose or broken R-signal wire from joystick
controller to J3 pin #19 valve driver.
Check continuity. Replace if defective.
5. No output on J3 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.
6. No output on J2 pin #3 of the valve driver to wire
#30.
Check for a minimum 3.5 volts. If no voltage
present with foot on footswitch check section 5 for
OCM pin voltage reference.
7. Loose or broken wire #30 from valve driver J2
pin #3 to plug A pin #12 in platform control
console.
Check continuity. Replace if defective.
8. Loose or broken wire #30 in boom cable A or its
connectors.
Check for continuity between pins #12 on cable A.
Check for loose or corroded connections on cable
connectors. Replace if wire is defective.
9. Loose or broken wire #30 from base connector
plug A pin #12 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