Toro Groundsmaster 4500-D Series Service Manual page 335

Solenoid Coil Testing
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
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
3. Disconnect wire harness connector from solenoid valve coil.
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 value from the measured value
of the component you are testing.
g276030
4. Using a multimeter (ohms setting), measure resistance between the two (2)
connector terminals on the solenoid valve coil.
Note: Solenoid coil resistance should be measured with solenoid at
approximately 20 ºC (68 ºF). Resistance 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).
A. If coil is secured to valve with a nut, identify coil by measuring the coil
diameter and coil height
solenoid coil is identified in the table below.
COIL DIAMETER
46.7 mm (1.84 in)
35.8 mm (1.41 in)
B. The resistance of the solenoid valve coil in the HI/ LOW range control
manifold (item 4 in
5. If solenoid coil resistance is incorrect, replace coil (see
Service (GM4500-D) (page
6. After testing is completed, connect wire harness connector to the solenoid
valve coil.
COIL
DIAMETER
Figure 215
(Figure 215). The correct resistance for the
COIL HEIGHT
49.9 mm (1.96 in)
36.3 mm (1.43 in)
Figure 214) is 7.1 ohms.
5–134)).
Page 6–53
(Figure 214).
COIL
HEIGHT
COIL RESISTANCE
7.1 ohm
8.8 ohm
Deck Control Manifold
Electrical System: Component Testing