Drive Motor/Circuit Check - JLG 10VP Service And Maintenance Manual

STEP
1. Check for ground into the switch from the ground connection on the
left brake limit switch.
2. Check for ground on the 49-4 wire coming out of left brake limit
switch.
Check for ground on the 49-4 wire going into the right brake limit
3.
switch.
Check for gound on the 49-3 side of the right brake limit switch.
4.
• Perform these checks with the joystick enabled and pushed to the full forward position.
STEP
Check for 24 volts at the drive motor on the 55-3 wire on the right
1.
motor and the 55-7 wire on the left drive motor. (Positive Side)
Check for 24 volts at the 55-3 wire at the X104 connector, pin A2 (for
2.
right motor) and the 55-7 wire at the X103 connector, pin A1 (for left
motor).
• Perform these checks with the joystick enabled and pushed to the full forward position.
STEP
Check for 24 volts at the wiring connectors on the 55-4 wire on the
1.
right drive motor brake unit and the 55-8 wire on the left drive motor
brake unit.
Check for 24 volts at the 55-4 wire at the X104 connector, pin 5(for
2.
right motor) and the 55-8 wire at the X103 connector, pin 5 (for left
motor).
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Table 3-8. Brake Limit Switch Circuit Check
ACTION
Table 3-9. Drive Motor/Circuit Check
ACTION
Table 3-10. Brake Switch/Circuit Check
ACTION
– JLG Lift –
SECTION 3 - TROUBLESHOOTING
SPEC YES
— Go to Step 2
— Go to Step 3
— Go to Step 4
Replace
—
MC-1 box
SPEC YES
Problem with
24 volts
Motor
Check wiring and
24 volts
connections
SPEC YES
Clean, Gap or
24 volts Replace Brake
Unit
Check wiring and
24 volts
connections
NO
Repair
Connection
Adjust/Replace
Switch
Repair/Replace
49-4 wire
Repair wire or
Connection
NO
Go the Step 2
Problem in MC-1
box or Joystick
NO
Go to Step 2
Problem in MC-1
box or Joystick
3-21