Skyjack SJ12 Service Manual

75
SJ12, SJ16
213558ADA
Electrical System Troubleshooting Section 4 – Troubleshooting Information
4.2-8 No Up Function from Platform Controls
1. Loose or broken wire #B from Joystick S7
connector pin #4 to Diode DB on Lift/Off/Drive
switch S3.
Check continuity. Replace if defective.
2. Open diode DB. Check diode. Replace if defective.
3. Loose or broken wire “B” from diode DB to lift/off/
drive switch S3.
Check continuity. Replace if defective.
4. Open or defective Lift/Off/Drive switch S3.
Operate switch.Check continuity between wire
#B and wire #14 when Lift selected.Replace if
defective.
5. Loose or broken wire #14 from Lift/Off/Drive
switch S3 to Platform connector X1 pin #A8.
Check continuity. Replace if defective.
6. Loose or broken wire #14 in Mast control cable
or its connections.
Check continuity between Mast function cable
connector P2 pin #2 and Platform connector X1
pin #A8 on cable. Check for loose or corroded
connections on cable connectors.Replace if wire is
defective.
7. Loose or broken wire #14 from Base terminal
block to Lift Speed Relay 14CR.
Check continuity. Replace if defective.
8. Loose or broken wire #14 from Lift Speed Relay
14CR to Lift Speed Relay2 14CR1.
Check continuity. Replace if defective
9. Open diode D14. Check diode. Replace if defective.
10. Defective low voltage protection Resistor RST7.
Check resistor and make sure it is secure. Replace
if defective.
11. Loose or broken wire #14A from Base terminal
block to Up Valve coil 4H-14A.
Check continuity. Replace if defective
12. Loose or broken wire #02 from Base terminal
block to Up Valve coil 4H-14A.
Check continuity. Replace if defective.
13. Defective Up Valve coil 4H-14A Check continuity through coil. Replace if defective.
14. Loose or broken wire #19B from Service Position
Limit switch LS3 to Control box connector pin
#C9.
Check continuity. Replace if defective.
15. Defective Service Position Limit switch LS3. Check limit switch. Replace if defective.
16. Loose or broken wire #19B in Mast control cable
or its connections.
Check continuity between Mast function cable
connector P2 pin #5 and Platform connector X1
pin #C4 on cable. Check for loose or corroded
connections on cable connectors.Replace if wire is
defective.
17. Loose or broken wire #19B from Diagnostic
switch S5 to Mast Control cable.
Check continuity. Replace if defective.

Skyjack SJ12 Specifications

General

Gradeability	25%
Drive Motor	24V DC
Machine Width	32 in (0.81 m)
Stowed Height	6.5 ft
Overall Width	32 in (0.81 m)
Stowed Height (Rails Folded)	6.5 ft
Drive Speed (Elevated)	0.5 mph (0.8 km/h)
Power Source	Electric