KYJACK, Page 9
JIII Conventional eries
143911
ection 4 - Troubleshooting Information
ervice and Maintenance
Electrical ystem (Continued)
4.1-16 No Drive or teer when Platform Elevated
1. Pothole protection bars not fully lowered.
Clear obstructions. Repair as needed.
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2. Loose or broken wire #71 from base terminal block to pothole protection limit switch LS4.
Check continuity. Replace if defective.
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3. Defective pothole protection limit switch LS4.
Check switch. Replace if defective.
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4. Loose or broken wire #72 from pothole protection limit switch LS4 to base terminal block.
Check continuity. Replace if defective.
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5. Loose or broken wire #72 from base terminal block to pothole protection limit switch LS5.
Check continuity. Replace if defective.
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6. Defective pothole protection limit switch LS5.
Check switch. Replace if defective.
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7. Loose or broken wire #19 from pothole protection limit switch LS5 to base terminal block.
Check continuity. Replace if defective.
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4.1-17 Elevated Drive peed Does not Activate
1. Loose or broken wire #59 from base terminal strip proportional relay 21CCR
(AN I/C A)
or 21ACR
(CE).
Check continuity. Replace if defective.
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1. Loose or broken wire #59A from proportional relay 21CCR
(AN I/C A)
or 21ACR
(CE)
to resistor
RS 2.
Check continuity. Replace if defective.
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2. Resistor RS 2 open.
Check resistor ohms, it should be 30 ohms. Replace if defective.
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3. Loose or broken wire #02 from resistor RS 2 to base terminal block.
Check continuity. Replace if defective.
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4. Proportional relay 21CCR
(AN I/C A)
or 21ACR
(CE)
defective.
Check relay, replace if defective.
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4.1-18 Work Platform Drives in low peed Only
1. Loose or broken wire #71 from base terminal block to high speed limit switch LS1A.
Check continuity. Replace if defective.
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2. Open or defective high speed limit switch LS1A.
Check switch. Replace if defective.
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3. Loose or broken wire #21 from high speed limit switch LS1A to low voltage protection resistor RS 3.
Check continuity. Replace if defective.
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4. Defective low voltage protection resistor RS 3.
Check resistor. Replace if defective.
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5. Loose or broken wire #21C
(AN I/C A)
or #21A
(CE)
from low voltage protection resistor RS 3 to
proportional relay 21CCR
(AN I/C A)
or 21ACR
(CE)
.
Check continuity. Replace if defective.
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6. Proportional relay 21CCR
(AN I/C A)
or 21ACR
(CE)
defective.
Check relay, replace if defective.
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7. Loose or broken wire #02 from proportional relay 21CCR
(AN I/C A)
or 21ACR
(CE)
to base terminal
block.
Check continuity. Replace if defective.
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8. Proportional controller S7 out of adjustment.
Adjust controller. Refer to Section 5, Joystick Adjusting Procedure.
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