Won't Drive With Platform Elevated; Won't Drive (Platform Elevated Only) - JLG 10VP Service And Maintenance Manual

SECTION 3 - TROUBLESHOOTING

Won't Drive (Platform Elevated Only)

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
1. Check for ground on tilt circuit at MC-1 box, X101 connector, pin 2,
(O/R, 49-6 wire).
2. Check for ground on PHP circuit at MC-1 box, X105 connector, pin
12, (O/R, 49-1 wire).
• No ground at MC-1 box, X101 connector, pin 2, (O/R, 49-6 wire).
STEP
Is tilt sensor light on showing a tilt condition, even though machine is
1.
within tilt limit.
2. Check for ground on the Black wire (direct to ground) running into tilt
sensor. (Continuity to B-)
Check for 24 volts at the Green to (Y/R, 2-5) wire from the main con-
3.
tactor relay.
4. Check for ground on the White to (O/R, 49-6) wire at connector.
3-22
Table 3-11. Won't Drive with Platform Elevated
ACTION
Table 3-12. Tilt Sensor Circuit Check
ACTION
– JLG Lift –
SPEC YES
— Go to Step 2
Problem in MC-1
—
controller box
SPEC YES
Adjust tilt sensor
—
if necessary
— Go to Step 3
— Go to Step 4
Repair connec-
tion at the X101
— connector end/
broken wire O/R
49-6
NO
Check Tilt Sensor
Circuit (Table 3-
12)
Check PHP
Switch Circuit
(Table 3-13)
NO
Go to Step 2
Repair
Connection
Check Connec-
tion to Main Con-
tactor Relay
Replace
Tilt Sensor
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