14 PTO Clutch Service
PTO Clutch Tests
14 - 2
PTO CLUTCH TESTS
Blade Brake Stopping Time Check
Mower blades and mower drive belt should come to a
complete stop within five seconds after electric PTO
switch is turned off.
1. With tractor in neutral, PTO disengaged and operator
in seat, start the engine.
2. Engage the PTO and wait several seconds.
Disengage the PTO and check the amount of time it
takes for the mower drive belt to stop.
3. If mower drive belt does not stop within five seconds,
replace the PTO clutch.
Electrical Tests
CHECK CLUTCH RESISTANCE
1. Unplug the PTO clutch wire harness (A, Figure 1).
2. Using a volt/ohm meter set to measure resistance
(Ohms), probe PTO clutch wire harness terminals.
The VOM should read 6.59 to 7.29 Ohms. If the clutch
resistance is not within this range, replace the clutch
assembly.
CHECK CLUTCH FOR SHORT CIRCUITS
1. Set VOM to Ohms.
2. Probe the clutch body with the negative test lead.
3. Probe one of the clutch wire harness terminals with
the positive lead. The VOM should show no continu-
ity.
4. Probe the other connector terminal with the positive
lead. Again, the VOM should show no continuity.
If the VOM shows continuity to the clutch body from
either terminal, the clutch has an internal short and
should be replaced to prevent damage to the engine.
CHECK CLUTCH ENGAGEMENT
1. Connect the PTO clutch terminals to a 12 VDC power
supply such as a 12 volt battery.
An audible “click” should be heard as the clutch
engages. If the clutch does not engage, replace it.
Reconnect the clutch wire connector after testing.
WARNING
Before beginning any service work, turn the PTO
off,set the parking brake, turn the ignition switch
off, remove the key, disconnect the spark plug
wire, and disconnect the negative battery cable.
PTO Clutch
Figure 1. PTO Clutch
A. Clutch Wire Harness
A
Содержание AGCO Allis 500 Series
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