SKYJACK, Page 10 SJIII Conventional Series
143911
Section 4 - Troubleshooting InformationService and Maintenance
Electrical System (Continued)
4.1-19 Forward Drive Function Inoperative
1. Loose or broken wire #16 from lift/drive switch S3 to base terminal block.
Check continuity. Replace if defective. -
2. Loose or broken wire #16 from base terminal block to forward drive valve coil 4H-16.
Check continuity. Replace if defective. -
3. Forward drive valve coil 4H-16 defective.
Check continuity through coil. Replace if defective. -
4. Loose or broken wire #02 from forward drive valve coil 4H-16 to base terminal block.
Check continuity. Replace if defective. -
5. Open diode D16.
Check diode. Replace if defective. -
4.1-20 Reverse Drive Function Inoperative
1. Loose or broken wire #15 from lift/drive switch S3 to base terminal block.
Check continuity. Replace if defective. -
2. Loose or broken wire #15 from base terminal block to reverse drive valve coil 4H-15.
Check continuity. Replace if defective. -
3. Reverse drive valve coil 4H-15 defective.
Check continuity through coil. Replace if defective. -
4. Loose or broken wire #02 from reverse drive valve coil 4H-15 to base terminal block.
Check continuity. Replace if defective. -
5. Open diode D15.
Check diode. Replace if defective. -
4.1-21 Brake will not Release
1. Diode D-16 forward or D-15 reverse is shorted or open.
Check diode. Replace if defective. -
2. Loose or broken wire #17 from base terminal strip to transfer relay 17CR.
Check continuity. Replace if defective. -
3. Loose or broken wire #02 from base terminal strip to transfer relay 17CR.
Check continuity. Replace if defective. -
4. Defective transfer relay 17CR.
Check relay. Replace if defective. -
5. Open or defective diode D17.
Check diode. Replace if defective. -
6. Loose or broken wire #17B from base terminal strip to transfer relay 17CR.
Check continuity. Replace if defective. -
7. Loose or broken wire #17A from transfer relay 17CR to brake coil 3H-17A.
Check continuity. Replace if defective. -
8. Brake valve coil 3H-17A defective.
Check continuity through coil. Replace if defective. -
9. Loose or broken wire #02 from brake valve coil 3H-17A to base terminal block.
Check continuity. Replace if defective. -
4.1-22 High/Low Torque Inoperative
1. Open diode D15-1 (reverse) or D16-1 (forward).
Check diode. Replace if defective. -
2. Loose or broken wire #7B from diodes D15-1 and D16-1 to lift/drive switch S3.
Check continuity. Replace if defective. -
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