Skyjack SJIII 3220 Operating & Maintenance Manual page 72

TROUBLESHOOTING INFORMATION
TROUBLE
REVERSE DRIVE
FUNCTION
INOPERATIVE
BRAKE WILL NOT
RELEASE
LIFT UP INOPERATIVE
FROM BASE
CONTROLS
LIFT DOWN
INOPERATIVE FROM
BASE CONTROLS
TWO OR MORE
FUNCTIONS AT ONE
TIME
POWERED PLATFORM
EXTENSION WILL NOT
EXTEND OR RETRACT
SECTION 4, Page 8
PROBABLE CAUSE
ELECTRICAL SYSTEM
1. Loose or broken wire #15 from Lift/
Drive Select Switch (S5) to Base
Terminal Block (TB-1).
2. Loose or broken wire #15 from Base
Terminal Block (TB-1) to Reverse Drive
Valve Coil (4H-15).
3. Reverse Drive Valve Coil (4H-15)
defective.
4. Loose or broken wire #02 from Reverse
Drive Valve Coil (4H-15) to Base
Terminal Block (TB-1).
5. Open Diode (D15).
1. Loose or broken wire #17A from
Transfer Relay (17CR). to Brake Valve
Coil (3H-17A).
2. Brake Valve Coil (3H-17A) defective.
3. Loose or broken wire #02 from Brake
Valve Coil (3H-17A) to Base Terminal
Block (TB-1).
4. Open Diode (D17).
5. Transfer Relay (17CR) defective.
1. Defective Up/Down Switch (S2).
2. Loose or broken wire #14E from Up/
Down Switch (S2) to Diode (D14E-1).
3. Open Diode (D14E-1).
4. Loose or broken wire #14E from Up/
Down Switch (S2) to Diode (D14E-2).
5. Open Diode (D14E-2).
1. Defective Up/Down Switch (S2).
2. Loose or broken wire #13 from Up/
Down Switch (S2) to Base Terminal
Block (TB-1).
1. Shorted Diode.
1. Lift/Drive Select Switch (S5) not in lift
position.
2. Loose or broken wire #09 from Platform
Terminal Block TB-2 to Powered
Platform Enable Switch (S12).
3. Powered Platform Enable Switch (S12)
defective.
4. Loose or broken wire #09A from
Powered Platform Enable Switch (S12)
to Platform Extend/Retract Switch
(S11).
5. Loose or broken wire #21B from
Platform Terminal Block TB-2 to Base
Terminal Block (TB-1).
6. Open Diode (D21B-1).
7. Open Diode (D21B-2).
8. Loose or broken wire #02 from Extend/
Valve Coil (4H-26) to Retract Valve Coil
(4H-27) to Platform Terminal Block
(TB-2).
Complete Revision 99-05-01
REMEDY
1. Check continuity.
defective.
2. Check continuity.
defective.
3. Check continuity through coil.
Replace if defective.
4. Check continuity.
defective.
5. Check diode. Replace if defective.
1. Check continuity.
defective.
2. Check continuity through coil.
Replace if defective.
3. Check continuity through coil.
Replace if defective.
4. Check diode. Replace if defective.
5. Check relay. Replace if defective.
1. Check switch. Replace if defective.
2. Check continuity.
defective.
3. Check Diode. Replace if defective.
4. Check continuity.
defective.
5. Check Diode. Replace if defective.
1. Check switch. Replace if defective.
2. Check continuity.
defective.
1. Check continuity of all Diodes.
Replace if defective.
1. Move switch to lift position.
2. Check continuity.
defective.
3. Check switch. Replace if defective.
4. Check continuity.
defective.
5. Check continuity.
defective.
6. Check diode. Replace if defective.
7. Check diode. Replace if defective.
8. Check continuity.
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
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