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Electrical System Section 4 – Troubleshooting Information
7. Defective relay 57DCR. Check relay. Replace if defective.
8. Loose or broken 57A wire from connector P4
pin 8 to start input on ECU or 57ACR relay if
equipped.
Check schematic applicable to the engine equipped
on the machine to determine ECU pin # or relay if
equipped.
NOTE
For other engine-related problems, consult the engine manufacturer’s manual.
4.2-4 The Engine will not Crank from the Base
1. Loose or broken wire #10 from base keyswitch
S2 to base start switch S5
Check continuity. Replace if defective
2. Loose or broken wire #57 from base start switch
S5 to base control module connector J2 pin 30.
Check continuity. Replace if defective
3. Defective start/enable switch S5 Check continuity through switch. Replace if
defective
4.2-5 The Engine will not Crank from the Platform
NOTE
The engine will not crank from the platform with the footswitch pressed.
1. Loose or broken wire #04 from platform terminal
block to start switch S9.
Check continuity. Replace if defective
2. Loose or broken wire #57B from start switch S9
to platform control module connector J12 pin 30
Check continuity. Replace if defective
3. Defective start switch S9 Check continuity through switch. Replace if
defective
4.2-6 The Boom Controls are Inoperative (Drive Operates)
1. Loose or broken wire #21A from base control
module connector J3 pin 24 to main harness 24
pin connector pin 3
Check continuity. Replace if defective
2. Loose or broken wire #21A from main harness
plug pin #3 to dump valve 2H-21A
Check continuity. Replace if defective
3. Loose or broken wire #02 from dump valve
2H-21A to main harness plug
Check continuity. Replace if defective
4. Defective dump valve coil 2H-21A Check continuity and resistance through coil.
Replace if defective
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