Toro Groundmaster 31900, Руководство по обслуживанию

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PTO Clutch
g306981
Figure 99
1. PTO clutch 2. Wire harness connector 3. Access slot (3 each)
An electric clutch is used to engage the PTO. The electric clutch is mounted on
the engine crankshaft and engages when current is applied to the clutch coil.
The clutch also incorporates a magnetic brake to stop clutch rotation when the
clutch is de-energized. For PTO clutch adjustment information, refer to
Adjusting
the PTO Clutch (page 7–4) .
Testing the PTO Clutch
1. Park the machine on a level surface, lower the cutting unit (or attachment),
engage the parking brake, set the key switch to the O
FF
position and remove
the key from the key switch.
2. Unplug the clutch electrical connector from the machine wire harness.
Check the harness connectors for damage or corrosion and clean or repair
if necessary.
Note: Prior to taking small resistance readings with a digital multimeter, short
the meter test leads together. The meter will display a small resistance value
(usually 0.5 ohms or less). This resistance is due to the internal resistance of
the meter and test leads. Subtract this value from the measured value of the
component you are testing to obtain an accurate reading.
3. Use a multimeter (ohms setting), check the clutch coil resistance across the
two clutch connector terminals. The coil resistance should be approximately
2.2 ohms when tested at 20°C (68°F) . Check that there is no continuity
between either of the clutch terminals and the clutch frame.
4. Apply 12 VDC to the terminals of the PTO electric clutch. The coil should
energize and the clutch should engage.
Electrical System: Testing the Electrical Components Page 6–48 Groundsmaster ® 3200, 3300 and 3310
19240SL Rev A