Only Drives A Short Distance; Will Only Drive A Short Distance - JLG 10VP Service And Maintenance Manual

SECTION 3 - TROUBLESHOOTING

Will Only Drive A Short Distance

Overview Of Procedure
The following procedure will eliminate any problems found in the power circuit to the MC-1 controller box and also any
objectionable environmental conditions.
Check For These Obvious Conditions First:
• Is Battery Voltage 24 Volts? (Fully Charge Batteries)
STEP
Is platform controller staying powered up when machine stops driv-
1.
ing?
2. Check the voltage out of the X101 connector, pin 5, to the power
relay pin 86. Check continuity at pin 85.
Check the voltage from pin 87 on the power relay to the main con-
3.
tactor. (Main contactor should be closed at this point)
Check the voltage on the Yel/Red, 2-5 wire on the X101 connector,
4.
pin A1, from the main contactor.
5. What type of surface is machine being operated on? Is surface soft,
unstable or up a steep grade?
6. Are brakes releasing when trying to drive?
Is drive system running free? No noise or dragging.
7.
8. Is machine being operated in an environment with high static
charge?
3-26
Table 3-16. Only Drives A Short Distance
ACTION
– JLG Lift –
SPEC YES
— Go to Step 2
24 Volts Go to Step 3
24 Volts Go to Step 4
24 Volts Go to Step 5
Machine will not
perform well on a
soft or unstable
surface, if motor
— draw is over 70
amps, controller
will shut the
machine down.
( 7 LED Code)
— Go to Step 7
— Go to Step 8
Machine may be
building static
charge in the MC-
— 1 controller,
which will make
the drive system
shut down.
NO
Check the E-Stop
& Key Switch
Circuit
(Table 3-17)
Repair or Replace
Wires, or Problem
with MC-1 Box
Repair or Replace
Wires or Relay
Repair or Replace
Wires or Main
Contactor
Go to Step 6
Repair/Replace
or Adjust Drive
Brakes
(See Procedure in
Service Manual)
Repair/Replace
or Adjust Drive
System
(See Procedure in
Service Manual)
—
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