Pump Valves Circuit - JLG 10VP Service And Maintenance Manual

SECTION 3 - TROUBLESHOOTING
Check the Black to ground on the pump contactor.
14.
POWER RELAY CIRCUIT
Check the Yel/Red, 2-4 wire, #87 on the Power Relay to the main
15.
contactor, and to diode at E-Stop for 24 volts.
Note: Power will stop at diode, silver line should be away from the E-
Stop.
Check the Yel/Red, 2-2 wire, #30 on the Power Relay to the E-stop
16.
and to the MC-1 box, X101 connector pin 3, for 24 volts.
17. Check the Black, #85 pin on the Power Relay for connection to
ground at pump contactor.
Check the Yel/Red, 2-3 wire, #86 on the Power Relay to the MC-1
18.
box, X101 connector pin 5, for 24 volts when the platform control is
powered up.
• Battery voltage 24 volts. (Fully charge batteries)
• Set key switch to Platform and set the Emergency Stop Button to the RESET position.
• Down Valve should be normal (closed).
• Dump Valve (up) should be normal (open).
• If machine will not lift and hydraulic oil is visible flowing in the hydraulic tank, the dump valve is stuck open.
STEP
LIFT UP - (CONDITIONS WHEN PUMP MOTOR IS RUNNING)
Pump Contactor Coil:
1.
2. Lift Up Valve Coil: Yel/Red, 2-6 wire - 24 volts
LIFT UP - (CHECK WHEN PUMP MOTOR IS NOT RUNNING)
3. Pump Contactor Coil:
Lift Up Valve Coil: Yel/Red, 2-6 wire - 24 volts
4.
LIFT DOWN - (CHECK WHEN DOWN AND ENABLE PADS ARE PUSHED ON THE PLATFORM CONTROL)
5. Lift Down Valve Coil:Yel/Red, 2-6 wire - 24 volts
LIFT DOWN - (CHECK WHEN NO FUNCTION ARE ENABLED ON THE PLATFORM CONTROL)
6. Lift Down Valve Coil:Yel/Red, 2-6 wire - 24 volts
3-32
Table 3-21. Pump Circuit
Table 3-22. Pump Valves Circuit
ACTION
Yel/Red, 2-6 wire - 24 volts
Tan, 55-1 wire - Ground
Tan, 3-1 wire - Ground
Yel/Red, 2-6 wire - 24 volts
Tan, 55-1 wire - 24 volts
Tan, 3-1 wire - 24 volts
Tan, 4-1 wire - Ground
Tan, 4-1 wire - 24 volts
Ground
24 volts
24 volts
Ground
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SPEC
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– JLG Lift –
Tighten/Repair
Go to Step 15
Connection
Tighten/Repair
Go to Step 16
Connection
Tighten/Repair
Go to Step 17
Connection
Tighten/Repair
Go to Step
Connection
Tighten/Repair
Go to Step
Connection
YES NO
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