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14.9 ELECTRIC CLUTCH
1. Belts, Matched Set
2. Bolt w/Washer
3. Clutch
4. Sheave
5. Engine
6. Power Take Off
7. Key
The electric clutch (Figure 51) turns the attachment used
on the unit on and off with a switch. The clutch is also
designed so that a brake is applied to the output shaft
when the clutch is disengaged (off).
The field coil is mounted to a bearing support and does
not rotate. The rotor is attached to the power output shaft
and rotates around the field assembly. The armature is
attached to the output pulley. The armature assembly is
held close to the rotor by the brake assembly. The clutch
is engaged by applying current to the coil connection. As
a result, current flows through the coil. This magnetizes
the coil and pulls the armature onto the rotor with
sufficient force to hold the two pieces together, effectively
connecting the output and the input shafts. Pulling the
armature against the rotor pulls it away from the brake,
releasing the brake.
14.10 ENGINE ELECTRICAL COMPONENTS
Refer engine servicing and repair to the engine
manufacturer's local service center. It has the service
information and parts available to properly service the
engine.
IMPORTANT: Gravely dealers should be able to test
engines and engine components to pinpoint troubles and
narrow them down to properly advise the engine service
technician.
1
2
3
7
Figure 51
14.11 SAFETY INTERLOCK SYSTEM
ELECTRICAL TESTS
See Figure 52 - Figure 64 for wiring and circuit diagrams.
Perform the following tests to ensure the safety interlock
system is working properly. If the unit does not perform
as stated contact your Gravely dealer for repairs.
Test
PTO
1
Off
2
On
3
Off
4
On
Initial check out: Make sure that all switches are in their
proper position for starting: (A) PTO off. (B) transmission
in neutral position. (C) operator on the seat. If there is no
battery voltage to start the engine, use the following
steps to determine the problem.
Check 1
Check out the battery. See "Servicing the Battery" on
page 13. Use a voltmeter to check for proper voltage.
Replace the battery if necessary and/or charge to proper
level.
Check 2
Use a voltmeter to make sure you have battery voltage to
terminal B on the back side of the ignition switch in the off
14 - 58
4
6
5
WARNING: Safety Interlock failure and
improper operation of unit can result in death
or serious injury. Check system before each
use to make sure it is functioning properly.
Parking Brake
Engaged
Engaged
Disengaged
Disengaged
Engine
Starts
Doesn't Start
Doesn't Start
Doesn't Start
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Table of Contents
Troubleshooting
