Testing
1.
stop engine, engage parking brake and remove key
from the ignition switch.
Park machine on a level surface, lower cutting deck,
2.
38).
Locatehydraulicvalvesolenoidcoiltobetested(Fig.
Disconnect wire harness connector from coil.
3.
the coil diameter and coil height (Fig. 39).
Identify coil resistance specification by measuring
COIL
DIAMETER
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.
COIL
HEIGHT
4.
Using a multimeter (ohms setting), measure resis-
tance between the two (2) connector terminals on the
solenoidcoil.Thecorrectresistance forthesolenoidcoil
is identified in the chart below.
COIL
DIAMETER
COIL
HEIGHT
COIL
RESISTANCE
Figure 39
1.84
in
1.96 in
7.1 ohm
8.8 ohm
(46.7
mm)
(49.9 mm)
4WD MANIFOLD
SHOWN
1.41
in
1.43 in
(36.3 mm)
(35.8
mm)
5
(6.7
ft--lb
N--m)
NOTE: Solenoid coil resistance should be measured
with solenoid atapproximately 68oF(20oC).Resistance
may be slightly different than listed at different tempera-
tures. Typically, a failed solenoid coil will either be
shorted (very low or no resistance) or open (infinite re-
sistance).
4
5.
If solenoid coil resistance is incorrect, replace coil:
A. Remove nut securing solenoid coil to the car-
tridge valve. Carefully slide solenoid coil off the
valve.
1
2
3
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.
Figure 40
1.
2.
Hydraulic manifold
Cartridge valve
3.
4.
Solenoid coil
Nut
6.
After testing is completed, connect wire harness
connector to the solenoid coil.
Groundsmaster 4100--D/4110--D
Page 5 -- 33
Electrical System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Document Type | Service Manual |
| Language | English |
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