SKYJACK, Page 9SJIII Compact Series
143909
Section 4 - Troubleshooting Information Service and Maintenance
Electrical System (Continued)
4.1-18 No Drive or Steer when Platform Fully Lowered
1. Loose or broken wire #71 from base terminal block to drive override limit switch LS6.
Check continuity. Replace if defective. -
2. Defective drive override switch LS6.
Check switch. Replace if defective. -
3. Loose or broken wire #19 from drive override limit switch LS6 to base terminal block.
Check continuity. Replace if defective. -
4.1-19 No Drive or Steer when Platform Elevated
1. Pothole protection bars not fully lowered.
Clear obstructions. Repair as needed. -
2. Loose or broken wire #71 from base terminal block to pothole protection limit switch LS4.
Check continuity. Replace if defective. -
3. Defective pothole protection limit switch LS4.
Check switch. Replace if defective. -
4. Loose or broken wire #72 from pothole protection limit switch LS4 to base terminal block.
Check continuity. Replace if defective. -
5. Loose or broken wire #72 from base terminal block to pothole protection limit switch LS5.
Check continuity. Replace if defective. -
6. Defective pothole protection limit switch LS5.
Check switch. Replace if defective. -
7. Loose or broken wire #19 from pothole protection limit switch LS5 to base terminal block.
Check continuity. Replace if defective. -
4.1-20 Elevated Drive Speed Does Not Activate
1. Loose or broken wire #59 from base terminal strip proportional relay 21ACR.
Check continuity. Replace if defective. -
1. Loose or broken wire #59A from proportional relay 21ACR to resistor RST2.
Check continuity. Replace if defective. -
2. Resistor RST2 open.
Check resistor ohms, it should be 30 ohms. Replace if defective. -
3. Loose or broken wire #02 from resistor RST2 to base terminal block.
Check continuity. Replace if defective. -
4. Proportional relay 21ACR defective.
Check relay, replace if defective. -
4.1-21 Work Platform Drives in Slow Speed Only
1. Open diode D17-1.
Check diode. Replace if defective. -
2. Loose or broken wire #17A from base terminal block to high speed limit switch LS1B.
Check continuity. Replace if defective. -
3. Open or defective high speed limit switch LS1B.
Check switch. Replace if defective. -
4. Loose or broken wire #21 from high speed limit switch LS1B to low voltage protection resistor RST3.
Check continuity. Replace if defective. -
5. Defective low voltage protection resistor RST3.
Check resistor. Replace if defective. -
6. Loose or broken wire #21A from low voltage protection resistor RST3 to proportional relay 21ACR.
Check continuity. Replace if defective. -
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