Skyjack 4632 - Page 75

SECTION 4, Page 7SJIII Series - The Conventionals 129919
Troubleshooting Information - Electrical System
Probable Cause Remedy
4.1-17. No Elevated Drive Function
1. Loose or broken wire #59 from Proportional Relay
(21CCR) to Resistor (RST2).
2. Resistor (RST2) open.
3. Loose or broken wire #59 from Resistor (RST2) to
Proportional Relay (21CCR).
4. Proportional Relay (21CCR) defective.
1. Check continuity. Replace if defective.
2. OHM Check Resistor, it should be 30 ohms. Replace
if defective.
3. Check continuity. Replace if defective.
4. Check relay, replace if defective.
4.1-18. Work Platform Drives In Slow Speed Only
1. Loose or broken wire #71 from Base Terminal Block
(TB-1) to High Speed Limit Switch (LS1).
2. Open or defective High Speed Limit Switch (LS1).
3. Loose or broken wire #21 from High Speed Limit
Switch (LS1) to Proportional Relay (21CCR).
4. Proportional Relay (21CCR) defective.
5. Loose or broken wire #2 from Proportional Relay
(21CCR) to Base Terminal Block (TB-1).
6. Proportional Controller (S7) out of adjustment.
1. Check continuity. Replace if defective.
2. Check switch. Replace if defective.
3. Check continuity. Replace if defective.
4. Check relay, replace if defective.
5. Check continuity. Replace if defective.
6. Adjust controller. Refer to Section 5, Joystick
Adjusting Procedure.
4.1-19. Forward Drive Function Inoperative
1. Loose or broken wire #16 from Lift/Drive Select Switch
(S5) to Base Terminal Block (TB-1).
2. Loose or broken wire #16 from Base Terminal Block
(TB-1) to Forward Drive Valve Coil (4H-16).
3. Forward Drive Valve Coil (4H-16) defective.
4. Loose or broken wire #02 from Forward Drive Valve
Coil (4H-16) to Base Terminal Block (TB-1).
5. Open Diode (D16).
1. Check continuity. Replace if defective.
2. Check continuity. Replace if defective.
3. Check continuity through coil. Replace if defective.
4. Check continuity. Replace if defective.
5. Check diode. Replace if defective.
4.1-20. Reverse Drive Function Inoperative
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. Check continuity. Replace if defective.
2. Check continuity. Replace if defective.
3. Check continuity through coil. Replace if defective.
4. Check continuity. Replace if defective.
5. Check diode. Replace if defective.
4.1-21. Brake Will Not Release
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. Check continuity. Replace if 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.