Drive Module - Power; Drive Sensor Reset - JLG T350 Troubleshooting Manual

SECTION 3 - COMPONENT CHECKS
Pump Motor Electrical Evaluation
Several basic electrical tests can be performed on the Pump Motor. Failure of one of these evaluations is significant and may
indicate that the device is physically damaged.
1. Make all measurements with a voltmeter set to resistance scale (Ohms). Disconnect the Main Battery Disconnect and
all pump motor cables during this analysis.
2. Resistance < 5 Ohms between Motor Terminals. The internal windings are very low impedance and should appear to
be a short-circuit for an ordinary voltmeter (other tests can determine if the windings are truly shorted). High resistance
can signal worn brushes, a faulty commutator, or open windings.
3. Resistance > 1 MegaOhm between Motor Terminals and Motor Housing. The internal windings should be electrically
isolated from the motor housing. Low resistance may be an indication of a broken motor terminal, damaged brush,
faulty commutator, or burned winding.

3.4 DRIVE MODULE - POWER

Step Pretest Instructions
3.4.1
3.4.2 Pull the ground emergency
stop switch and place key
switch in ground position
3.4.3 Pull the ground emergency
stop switch and place key
switch in ground position
3.4.4
3.4.5
3.4.6

3.5 DRIVE SENSOR RESET

If an error is detected with the turntable position sensor or hand brake position sensor, they need to be reset before the con-
trol system will accept their values and allow drive and set functions.
Turntable Position Sensor
If an error is detected with the switch or the transport switch does not agree with the turntable position switch, then "TURN-
TBL SW ERR" is displayed in the diagnostics. When the boom is set on the boom rest, the transport switch should already
be closed (Transport), Turntable1 should change from Off to On, and Turntable2 should change from On to Off. Turntable1
3-120
Test
Voltage between X074.2 and Yes
X099 (B+) = Vbatt?
No
Voltage between X012.1 and Yes
X012.2 = Vbatt?
No
Voltage on X009.87 = Vbatt? Yes
No
Voltage between X012.2 and Yes
X099 (B+) = Vbatt?
No
Voltage between X009.85 Yes
and X099 (B+) = Vbatt?
No
Voltage between X004.32 Yes
and X099 (B+) = Vbatt?
No
T350 T500J
Result Corrective Action
Go to step 3.4.2
Go to step 3.4.4
Repair or replace Yel/Red 2-16 wire
between X012.1 and X074.1
Go to step 3.4.3
Repair or replace Yel/Red 2-16 wire
between X009.87 and X012.1
See 3.9 Ignition Relay - Power
Repair or replace Black wire between
X074.2 and X012.2
Go to step 3.4.5
Repair or replace Black wire between
X012.2 and X009.85
Go to step 3.4.6
Repair or replace Black wire between
X009.85 and X004.32
Consult Factory
3121203