Code 06 - Drive Motor Brush Wear Warning Indicator; Code 07 - Left Drive Motor - Disconnected - JLG 15MVL Series Service Maintenance Manual

Code 06 - Drive Motor Brush Wear Warning Indicator

Check For These Obvious Conditions First:
• Did the Brush Wear Indication relay get wet. If so, dry the relay and wire terminals and reset the Brush Wear Warning
Timer.
• Program Ground Control Station module to reset the Brush Wear Warning Timer - see Section 4.6, Ground Control Mod-
ule - Programming.
• If machine has accumulated a lot of hours in service since new or the last brush replacement, check the Drive Motor
Brushes - see Section 3, Replacing Drive Motor Brushes - for brush replacement instructions.
STEP
1. If the WORN code immediately comes up again after resetting, then check
the voltage at the brush wear indication relay where the wires (wht/red 57-1
and 57-2) from the drive motors connect at terminal (#85).
If there is voltage on relay terminal #85, you have a problem with the
motor.... check for voltage at the terminals at the motor to determine which
motor has the bad brushes
2. If there is no voltage at terminal #85 on the wear indication relay, and there
is voltage on relay terminal #87, you have a problem with the relay or the
wiring
3. If there is no voltage at relay terminal #85, and there is no voltage on relay
terminal #87, you have a problem with the wiring or controller if the code
immediately repeats

Code 07 - Left Drive Motor - Disconnected

Check For These Obvious Conditions First:
• Check left drive motor M1 connector at the Traction Control Module for secure and proper connection.
STEP
1. Check resistance across positive (+) and negative (–) drive motor leads in
M1 connector wiring harness going to the left drive motor. Is reading within
spec?
2. Repair or replace left drive motor wiring, brushes or motor.
(For brush replacement, see Section 3 of this Service Manual)
3121231
Table 6-10. Code 06 - Drive Motor Brush Wear Warning Indicator
ACTION
Table 6-11. Code 07 - Left Drive Motor - Disconnected
ACTION
SECTION 6 - TROUBLESHOOTING
SPEC
0 Volts
—
—
SPEC
.1 to .3 ohms
—
– JLG Lift –
YES NO
Problem is in motor,
brushes need Go To Step 2
replacement
Check relay
Go to Step 3
or wiring
Replace wiring
—
or GCM
YES NO
Replace Traction Go to Step 2
Module
— —
6-21