SECTION 4, Page 9SJIII Series - The Conventionals 129919
Troubleshooting Information - Electrical System
Probable Cause Remedy
4.1-27. Powered Extension Platform Will Not Retract
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. 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, replace if defective.
4.1-28. High/Low Torque Inoperative
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-1) or (3H-18A-2).
10. Loose or broken wire #02 from Rear Drive Manifold
to Base Terminal Block (TB-1).
1. Check diode. Replace if defective.
2. Check continuity. Replace if defective.
3. Check switch. Replace if defective.
4. Check continuity. Replace if defective.
5. Check continuity. Replace if defective.
6. Check continuity. Replace if defective.
7. Check switch. Replace if defective.
8. Check continuity. Replace if defective.
9. Check continuity through coil. Replace if defective.
10. Check continuity. Replace if defective.
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