Hydraulic Solenoid Valve Coils - Toro Reelmaster 7000 Service Manual

Hydraulic Solenoid Valve Coils

Numerous hydraulic solenoid valve coils are used on
the hydraulic control manifolds of Reelmaster 7000 ma-
chines. When energized by the TEC controller, these
coils provide hydraulic circuit control.
Two (2) different solenoid valve coils are used on the Re-
elmaster 7000. A coil can be identified by measuring it's
height and diameter (Fig. 46). Testing of the coils can be
done with the coil remaining on the hydraulic valve.
NOTE: To assist in troubleshooting, identical solenoid
coils can be exchanged. If the problem follows the ex-
changed coil, a problem with the coil likely exists. If the
problem remains unchanged, something other than the
solenoid coil is the problem source (e.g. switch, circuit
wiring, hydraulic problem).
Testing
1. Park machine on a level surface, lower cutting units,
stop engine, engage parking brake and remove key
from the ignition switch.
2. Locate hydraulic valve solenoid coil to be tested.
Identify coil by measuring the coil diameter and coil
height (Fig. 46).
3. Disconnect wire harness connector from 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 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
1.840 inch 1.960 inch
(46.7 mm) (49.9 mm)
1.410 inch 1.430 inch
(35.8 mm) (36.3 mm)
NOTE: Solenoid coil resistance should be measured
with solenoid at approximately 68
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).
Reelmaster 7000
COIL
RESISTANCE
7.1 ohm
8.8 ohm
o o
F (20 C). Resistance
Page 5 - - 33
5. If solenoid coil resistance is incorrect, replace sole-
noid (see Hydraulic Solenoid Valve Coil Removal and
Installation in the Service and Repairs section of this
chapter).
6. After testing is completed, connect wire harness
connector to the solenoid coil.
Figure 46
COIL
DIAMETER
COIL
HEIGHT
Electrical System