Service Manual

6-17Z Master 500 Gas Series Service Manual
6
ELECTRICAL
Fig 353 DSC-2553
1. Disengage the PTO, set the parking brake, turn the
ignition to the “off” position and remove the ignition
key.
2. Disconnect the clutch wire.
3. Set the multimeter or volt/ohm meter to check
resistance (ohms).
4. Connect the meter lead wires to the clutch wires as
shown (Fig. 353).
If the electric PTO clutch does not engage or is suspect
as the cause of an electrical problem in the PTO circuit,
use the following troubleshooting steps to determine
whether the clutch has failed or another electrical
problem exists.
Testing
Coil Resistance Measurement
5. The meter should read between approximately 2-4
ohms (meter readings may vary). If the reading
is above or below these readings, the eld has
failed and needs to be replaced. If the reading falls
between 2-4 ohms, measure clutch current draw.
1. Disengage the PTO, set the parking brake, turn the
ignition key to OFF, and remove the key.
2. Loosen 4 bolts and remove the rear bumper plate
loosening 4 bolts.
3. Disconnect the electric PTO clutch wire connector.
4. Set the multi meter to check amps (10 amp scale).
5. Connect the positive meter lead to the tractor
terminal (1) of the clutch harness (Fig. 354).
Measuring Clutch Current Draw
Fig 354 diag 3-7
6. Connect the negative meter lead to the correspond-
ing wire terminal (3) (Fig. 354, above).
7. Connect a short jumper lead from terminal (2) to
terminal (4) (Fig. 354, above).
8. Turn the ignition switch to the “RUN” position. Turn
the PTO switch to the “ON” position.
9. If the meter is 3.5 amps or above, the system is
functioning properly. If the meter reading is below
3.5 amps, check the electrical system for problems
(i.e., the battery, ignition switch. PTO switch, or
wiring harness may be malfunctioning).