Service manual

Groundsmaster 3280−D/3320Page 6 − 12Electrical System
Hour Meter
1. Connect the positive (+) terminal of a 12 VDC source
to the positive (+) terminal of the hour meter.
2. Connect the negative (−) terminal of the voltage
source to the other terminal of the hour meter.
3. The hour meter should move a 1/10 of an hour in six
minutes.
4. Disconnect the voltage source from the hour meter.
Figure 8
QUARTZ
Hobbs
HOURS
1
0000
1
10
+
BACK
P.T.O. Switch
The P.T.O. switch is mounted on the control panel and
is pulled to engage the P.T.O. electric clutch.
The Standard Control Module monitors the operation of
the P.T.O. switch. If the ignition switch is in the ON posi-
tion and the P.T.O. switch is pulled out, the Module P.T.O.
switch input LED should be illuminated.
Testing
When the switch knob is pulled out to engage the P.T.O.,
the COM B and middle switch terminals should have
continuity (Fig. 10). COM B and NC should not have
continuity.
When the switch knob is pushed in, the outside switch
terminals (COM B and NC) should have continuity (Fig.
10). COM B and middle switch terminals should not
have continuity.
1. Control panel 2. P.T.O. switch
Figure 9
2
1
1. COM B terminal
2. Middle terminal
3. NC terminal
Figure 10
2
3
1