Skyjack SJIII 3220 Operating & Maintenance Manual page 73

TROUBLESHOOTING INFORMATION
TROUBLE
POWERED EXTENSION
PLATFORM WILL NOT
EXTEND
POWERED EXTENSION
PLATFORM WILL NOT
RETRACT
HIGH/LOW TORQUE
INOPERATIVE
SJIII Series - The CONVENTIONALS
PROBABLE CAUSE
ELECTRICAL SYSTEM
1. Powered Platform Extend/Retract
Switch (S11) defective.
2. Loose or broken wire #26 from
Powered Platform Extend/Retract
Switch (S11) to extend Valve Coil (4H-
26).
3. Extend Valve Coil (4H-26) defective.
4. Open Diode (D26).
5. Loose or broken wire #02 from
Extend Valve Coil (4H-26).
1. Powered Platform Extend/Retract
Switch (S11) defective.
2. Loose or broken wire #27 from
Powered Platform Extend/Retract
Switch (S11) to Retract Valve Coil (4H-
27).
3. Retract Valve Coil (4H-27) defective.
4. Open Diode (D27).
5. Loose or broken wire #02 from Retract
Valve Coil (4H-27).
1. Open Diode (D15-1). (Reverse) or
(D16-1) (Forward).
2. Loose or broken wire #18 from Diodes
(D15-1) and (D16-1) to High/Low
Torque (S27).
3. Defective High/Low Torque Switch
(S27).
4. Loose or broken wire #18 from High/
Low Torque Switch (S27) to Platform
Terminal Block (TB-2).
5. Loose or broken wire #18 from Platform
Terminal Block (TB-2) to Base Terminal
Block (TB-1).
6. Loose or broken wire #18 from Base
Terminal Block (TB-1) to High Speed
Limit Switch (LS1)
7. Defective High Speed Limit Switch
(LS1).
8. Loose or broken wire #18A from High
Speed Limit Switch (LS1) to Rear Drive
Manifold.
9. Defective Speed Valve Coils (3H-18A)
or (3H-18A-2).
10. Loose or broken wire #02 from Rear
Drive Manifold to Base Terminal Block
(TB-1).
117128
Complete Revision 99-05-01
REMEDY
1. Check switch. Replace if defective.
2. Check continuity. Replace if
defective.
3. Check continuity through coil,
replace if defective.
4. Check diode. Replace if defective.
5. Check continuity through coil.
Replace if defective.
1. Check switch. Replace if defective.
2. Check continuity.
defective.
3. Check continuity through coil,
replace if defective.
4. Check diode. Replace if defective.
5. Check continuity, replace if defective.
1. Check diode. Replace if defective.
2. Check continuity.
defective.
3. Check switch, replace if defective.
4. Check continuity.
defective.
5. Check continuity.
defective.
6. Check continuity.
defective.
7. Check switch. Replace if defective.
8. Check continuity.
defective.
9. Check continuity through coil.
Replace if defective.
10. Check continuity.
defective.
SECTION 4, Page 9
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if