Skyjack SJIII 3220 Operating & Maintenance Manual page 70

TROUBLESHOOTING INFORMATION
TROUBLE
RIGHT STEER
INOPERATIVE
(Machines without
Powered Platform)
LEFT STEER
INOPERATIVE
(Machines without
Powered Platform)
RIGHT STEER
INOPERATIVE
(Machines with a
Powered Platform)
SECTION 4, Page 6
PROBABLE CAUSE
ELECTRICAL SYSTEM
1. Defective Steer Right Switch (S72).
2. Loose or broken wire #23 from Steer
Right Switch (S72) to Lift/Drive Select
Switch (S5).
3. Defective Lift/Drive Select Switch (S5).
4. Loose or broken wire #23A from Lift/
Drive Select Switch (S5) to Platform
Terminal Block (TB-2).
5. Loose or broken wire #23A from
Platform Terminal Block (TB-2) to Base
Terminal Block (TB-1).
6. Loose or broken wire #23A from Base
Terminal Block (TB-1) to Steer Right
Valve Coil (4H-23A).
7. Defective Steer Right Valve Coil
(4H-23A).
8. Loose or broken wire #02 from Steer
Right Valve Coil (4H-23A) to Base
Terminal Block (TB-1).
9. Open Diode (D23A).
1. Defective Steer Left Switch (S73).
2. Loose or broken wire #24 from Steer
Left Switch (S73) to Lift/Drive Select
Switch (S5).
3. Defective Lift/Drive Select Switch (S5).
4. Loose or broken wire #24A from Lift/
Drive Select Switch (S5) to Platform
Terminal Block (TB-2).
5. Loose or broken wire #24A from
Platform Terminal Block (TB-2) to Base
Terminal Block (TB-1).
6. Loose or broken wire #24A from Base
Terminal Block (TB-1) to Steer Left
Valve Coil (4H-24A).
7. Defective Steer Left Valve Coil (4H-
24A)
8. Loose or broken wire #02 from Steer
Left Valve (4H-24A) to Base Terminal
Block (TB-1)
9. Open Diode (D24A).
1. Defective Right Steer Switch (S72).
2. Loose or broken wire #23 from Right
Steer Switch (S72) to Platform Terminal
Block (TB-2).
3. Loose or broken wire #23 from Platform
Terminal Block (TB-2) to Base Terminal
Block (TB-1).
4. Loose or broken wire #23 from Base
Terminal Block (TB-2) to Steer Right
Valve Coil (4H-23).
5. Defective Steer Right Valve Coil
(4H-23).
6. Loose or broken wire #02 from Steer
Right Valve Coil (4H-23) to Base
Terminal Block (TB-1).
7. Open Diode (D23).
Complete Revision 99-05-01
REMEDY
1. Check switch. 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 continuity through coil.
Replace if defective.
8. Check continuity.
defective.
9. Check diode. Replace if defective.
1. Check switch. 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 continuity.
defective.
8. Check continuity.
defective.
9. Check diode. Replace if defective.
1. Check switch. Replace if defective.
2. Check continuity.
defective.
3. Check continuity.
defective.
4. Check continuity.
defective.
5. Check continuity through coil.
Replace if defective.
6. Check continuity.
defective.
7. Check diode. Replace if defective.
SJIII Series - The CONVENTIONALS
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
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