Skyjack SJ20 Service Manual

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SJ20 238886ABA
Section 4 – Troubleshooting InformationElectrical System
4.2-9 No Lift/Lower from Platform Controls
1. Loose or broken 09 wire from lift/off/drive switch
S3 to joystick pin P-23
Check continuity. Replace if defective.
2. Open or defectivelift/off/drive switch S3 Close switch. Replace if defective
4.2-10 No Steer Left
1. Loose or broken wire 24 from steer coil 4H-24 to
machine controller pin A1
Check continuity. Replace if defective.
2. Defective coil 4H-24 Replace coil
3. Defective left steer switch or wiring on upper contol
joystick
Check wiring and switch. Repair or replace if
defective.
4.2-11 No Steer Right
1. Loose or broken wire 23 from steer coil 3H-23 to
machine controller pin A24
Check continuity. Replace if defective.
2. Defective coil 4H-23 Replace coil
3. Defective right steer switch or wiring on upper contol
joystick
Check wiring and switch. Repair or replace if
defective.
4.2-12 No Drive
1. Loose or broken 12 wire from lift/off/drive switch
S3 to joystick pin P-07
Check continuity. Replace if defective.
2. Open or defectivelift/off/drive switch S3 Close switch. Replace if defective
3. Loose or broken 05A wire from base E-stop S28 to to
30ACR brake relay pin 30 and/or pin 86
Check continuity. Replace if defective.
4. Loose or broken 30A wire from 30ACR brake relay pin
85 to machine controller pin B-22
Check continuity. Replace if defective.
5. Defective 30ACR brake relay
Check relay Replace if defective.
6. Loose or broken 05B from diode D05B to brake BK1
pin P7-1 and/or BK2 pin P9-1
Check continuity. Replace if defective.
7. Loose or broken wire 30L from BK2 pin P9-2 to
machine controller pin A30
Check continuity. Replace if defective.
8. Loose or broken wire 30R from BK1 pin P7-2 to
machine controller pin A28
Check continuity. Replace if defective.
9. Defective brake BRK1 or BRK2
Check brakes. Replace if defective.

Skyjack SJ20 Specifications

General

Brand	Skyjack
Model	SJ20
Category	Lifting Systems
Language	English