Hydraulic Valve Solenoids - Toro Groundsmaster 4000-D Service Manual

Hydraulic Valve Solenoids

There are four hydraulic valve solenoids on the Ground-
smaster 4000−D (Fig. 23). Testing of these solenoids
can be done with the solenoid on the hydraulic valve.
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 val-
ue from from the measured value of the component you
are testing.
1. Make sure engine is off. Disconnect hydraulic valve
solenoid electrical connector (Fig. 22).
2. Apply 12VDC source directly to the solenoid. Listen
for solenoid to switch on.
3. Remove 12VDC source from the solenoid. Listen for
solenoid to switch off.
4. Measure resistance between the two connector ter-
minals. The resistance for the solenoid coil should be
about 7.2 ohms.
2 to 5 ft−lb
(3 to 7 N−m)
RIGHT
FRONT
2 to 5 ft−lb
(3 to 7 N−m)
1
1. Hydraulic valve solenoid (decks)
2. Hydraulic manifold (decks)
Electrical System
5. Install new solenoid if necessary.
6. Reconnect electrical connector to the solenoid.
1
2
Figure 23
3. Hydraulic valve solenoid (traction)
Page 5 − 16
A. Apply "Loctite 242" or equivalent to threads on
end of valve stem before installing nut.
B. Torque solenoid nut to specification identified in
Figure 23. Over−tightening may damage the sole-
noid or cause the valve to malfunction.
2
Figure 22
1. Manifold (RH shown)
2. Valve solenoid
2
3
2
4. Hydraulic manifold (traction)
1
3
3. Solenoid connector
4
4 to 6 ft−lb
(5 to 8 N−m)
2 to 5 ft−lb
(3 to 7 N−m)
1
Groundsmaster 4000−D