Won't Drive (Platform Lowered Or Elevated); Drive Train Troubleshooting - JLG 10VP Service And Maintenance Manual

SECTION 3 - TROUBLESHOOTING

3.8 DRIVE TRAIN TROUBLESHOOTING

Won't Drive (Platform Lowered Or Elevated)

IF MACHINE WON'T DRIVE ONLY WHEN PLATFORM IS ELEVATED, SEE SECTION 4.4
Overview Of Procedure
The following procedures check the components and circuits that feed data to the MC-1 Controller box assuring it is receiv-
ing the proper signals and conditions before engaging the machines' drive motors.
Check For These Obvious Conditions First:
• Joystick Powered On
• Unit will Lift & Lower Platform
• Machine is not Tilted - (3 LEDs flashing at joystick control)
• PHP Device is not Obstructed - (4 LEDs flashing at joystick control)
• Brakes are not Released - (2 LEDs flashing at joystick control)
• Charger is not Plugged In - (8 LEDs flashing at joystick control)
STEP
Check for ground from elevation limit switch in the X101 connector,
1.
pin 1 (49-5) at MC-1 box.
Check for ground from charger circuit wire in the X101 connector,
2.
pin 4 (49-7) at MC-1 box. (Perform this check with the charger
unplugged)
Check for ground from brake limit switches in the X105 connector,
3.
pin 11 at MC-1 box.
4. Check that brakes are releasing, (2 LEDs) when joystick is enabled
& moved forward.
• Perform these checks at the elevation switch which is located inside the top of mast section-1.
• Check with mast lowered.
STEP
1. Check for ground into the switch from ground connection.
2. Check for ground out of switch to the 49-5 wire.
Check for ground from switch to X101, Pin 1.
3.
3-20
Table 3-6. Won't Drive. (Platform Lowered or Elevated)
ACTION
Table 3-7. Elevation Switch Circuit Check
ACTION
SPEC
—
—
—
—
SPEC
—
—
—
– JLG Lift –
YES NO
Check Elevation
Go to Step 2 Limit Switch
Circuit (Table 3-7)
Faulty Charger Go to Step 3
Check Brake
Go to Step 4 Limit Switch Cir-
cuit (Table 3-8)
Check Drive Check Brake
Motor Circuit Switch/Circuit
(Table 3-9) (Table 3-10)
YES NO
Repair
Go to Step 2
Connection
Adjust/Replace
Go to Step 3
Switch
Repair Wire or
—
Connection
3120728