Toro Groundsmaster 4000-D Service Manual page 243

Testing
1. Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake and remove
key from the ignition switch.
2. Locate hydraulic solenoid valve coil to be tested (Fig.
66). Disconnect wire harness connector from coil.
3. Identify coil resistance specification by measuring
the coil diameter and coil height (Fig. 67).
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.
4. Using a multimeter (ohms setting), measure resis-
tance between the two (2) connector terminals on the
solenoid valve coil. The correct resistance for the sole-
noid coil is identified below:
COIL COIL
DIAMETER HEIGHT
1.34 in 1.53 in
(34.0 mm) (38.9 mm)
1.84 in 1.96 in
(46.7 mm) (49.9 mm)
1.41 in 1.43 in
(35.8 mm) (36.3 mm)
NOTE: Solenoid valve coil resistance should be mea-
sured with solenoid at approximately 68
sistance may be slightly different than listed at different
temperatures. Typically, a failed solenoid coil will either
be shorted (very low or no resistance) or open (infinite
resistance).
5. If solenoid valve coil resistance is incorrect, replace
solenoid coil:
A. Remove nut securing solenoid coil to the car-
tridge valve. Carefully slide coil off the valve.
B. Install new solenoid coil to the cartridge valve.
Install and torque nut 5 ft- -lb (6.7 N- -m). Over--tight-
ening may damage the solenoid coil or cause the
cartridge valve to malfunction.
6. After testing is completed, connect wire harness
connector to the solenoid coil.
Groundsmaster 4000--D/4010--D
COIL
RESISTANCE
5.4 ohm
7.1 ohm
(6.7 N- -m)
8.8 ohm
o o
F (20 C). Re-
4
1. Hydraulic manifold
2. Cartridge valve
Page 5 - - 53
COIL
DIAMETER
Figure 67
1
5 ft- -lb
2
3
LH PTO
MANIFOLD SHOWN
Figure 68
3. Solenoid coil
4. Nut
COIL
HEIGHT
Electrical System