Hydraulic Valve Solenoids
The Groundsmaster 4500--D has three hydraulic valve
solenoids: one on each cutting deck manifold and one
on the traction manifold. The Groundsmaster 4700--D
has five solenoids: two on each cutting deck manifold
and one on the traction manifold. Testing of these sole-
noids can be done with the solenoid on the hydraulic
valve.
2
2
1
3
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
1
0.5
ohms or less). This resistance is due to the internal
Figure 25
resistance of the meter and test leads. Subtract this val-
ue from from the measured value of the component you
are testing.
1.
2.
Deck manifold (4500--D)
Valve solenoid
3.
Solenoid connector
1.
Make sure engine is off. Disconnect hydraulic valve
2
solenoid electrical connector (Fig. 25).
2
2.
Apply 12VDC source directly to the solenoid. Listen
for solenoid to switch on.
3
3.
Remove 12VDC source from the solenoid. Listen for
solenoid to switch off.
3
4.
Measure resistance between the two connector ter-
minals. The resistance for the solenoid coil should be
about 7.2 ohms.
1
5.
Install new solenoid if necessary.
Figure 26
1.
2.
Deck manifold (4700--D)
Valve solenoid
3. Solenoid connector
A. Apply “Loctite 242” or equivalent to threads on
end of valve stem before installing nut.
B. For traction manifold solenoid, torque nut from 4
to 6 ft--lb (5 to 8 N--m). For cutting deck solenoid,
torque nut to 5 ft--lb (7 N--m). Over--tightening may
damage the solenoid or cause the valve to malfunc-
tion.
6.
Reconnect electrical connector to the solenoid.
Groundsmaster 4500--D/4700--D
Page 5 -- 17
Electrical System (Rev. A)
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