Code 06 - drive motor brush wear warning indicator, Code 07 - left drive motor - disconnected, Code 07 - left drive motor - disconnected -21 – JLG 15/20MSP Service Manual User Manual
Page 141: See table 6-10, Ge 6-21, See table 6-11, 21 code 07 - left drive motor - disconnected
SECTION 6 - TROUBLESHOOTING
3121231
– JLG Lift –
6-21
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-
• 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.
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.
Table 6-10. Code 06 - Drive Motor Brush Wear Warning Indicator
STEP
ACTION
SPEC
YES
NO
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
0 Volts
Problem is in motor,
brushes need
replacement
Go To Step 2
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
—
Check relay
or wiring
Go to Step 3
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
—
Replace wiring
or GCM
—
Table 6-11. Code 07 - Left Drive Motor - Disconnected
STEP
ACTION
SPEC
YES
NO
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?
.1 to .3 ohms
Replace Traction
Module
Go to Step 2
2.
Repair or replace left drive motor wiring, brushes or motor.
(For brush replacement, see Section 3 of this Service Manual)
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