Service manual
SKYJACK, Page 4 SJIII Compact Series
143909
Section 4 - Troubleshooting Information Service and Maintenance
Electrical System
4.1-1 All Controls Inoperative
1. Battery charger plugged into external power source.
Disconnect charger cord. -
2. Batteries disconnected.
Connect batteries. -
3. Dirty or loose battery terminals.
Clean and tighten connections. -
4. Battery charge low.
Check each cell with a hydrometer. Reading should be 1.275 (fully charged). Recharge if low -
reading. Replace if reading difference between cells is 0.050.
5. Main battery cables open or defective.
Check continuity. Replace if defective. -
6. Fuse F1 defective.
Replace fuse. -
7. Main battery disconnect switch S1 open or defective.
Close switch. Check continuity. Replace if defective. -
8. Loose or broken wire #3 from motor contactor C1 to circuit breaker CB2.
Check continuity. Replace if defective. -
9. Loose or broken wire #3A from circuit breaker CB2 to charger relay L1CR.
Check continuity. Replace if defective. -
10. Defective or tripped circuit breaker CB2.
Reset circuit breaker. Replace if defective. -
11. Defective battery charger relay L1CR.
Check relay. Replace if defective. -
12. Loose or broken wire #5 from charger relay L1CR to base emergency stop switch S28.
Check continuity. Replace if defective. -
13. Open or defective base emergency stop switch S28.
Close switch. Check switch. Replace if defective. -
14. Loose or broken wire #5A from base emergency stop switch S28 to base key switch S10.
Check continuity. Replace if defective. -
15. Open or defective base key switch S10.
Select function with switch. Check switch. Replace if defective. -
16. Loose or broken wire #00 from pump motor DCM1 to circuit breaker CB1.
Check continuity. Replace if defective. -
17. Defective or tripped circuit breaker CB1.
Reset circuit breaker. Replace if defective. -
18. Loose or broken wire #02 from circuit breaker CB1 to base terminal block.
Check continuity. Replace if defective. -
19. Loose or broken wire #7A from base terminal block to CM1 control module pin P2-12. (CE only)
Check continuity. Replace if defective. -
20. Loose or broken wire #02 from base terminal block to CM1 control module pin P2-11. (CE only)
Check continuity. Replace if defective. -
4.1-2 All Controls Except for Down Function Inoperative
1. Loose or broken wire #59 from base terminal block to proportional valve 2H-59.
Check continuity. Replace if defective. -
2. Loose or broken wire #02 from base terminal block to proportional valve 2H-59.
Check continuity. Replace if defective. -
3. Defective proportional valve coil.
Check coil for resistance. Reading should be 19 ohms. Replace if defective. -