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Electrical System
Sand Pro 2040Z
Hydraulic Manifold Solenoid Coils
Two (2) identical hydraulic solenoid valve coils are used
on the Sand Pro hydraulic manifold (Fig. 22). The coils
allow shifting of the hydraulic valve to cause the rear at-
tachment to raise or lower and are energized when the
attachment switch on the right motion control handle is
pressed by the operator .
NOTE: To assist in troubleshooting, the two (2) hydraul-
ic manifold solenoid coils can be exchanged. If the prob-
lem follows the exchanged coil, a problem with the coil
likely exists. If the problem remains unchanged, some-
thing other than the solenoid coil is the problem source
(e.g. attachment switch, circuit wiring, hydraulic p rob-
lem).
Testing
1. Park machine on a level surface, lower rear attach-
ment, stop engine, apply parking brake and remove key
from ignition switch.
2. Locate hydraulic solenoid valve coil to be tested. For
assembly purposes, label wire harness connectors that
attach to solenoid coils on hydraulic manifold.
3. Disconnect wire harness connector from coil. Resist-
ance testing of the coils can be done with the coil re-
maining 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.
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 Sand
Pro solenoid coils is 8.8 ohms.
NOTE: Solenoid valve coil r esistance should be mea-
sured with solenoid at approximately 68
o
F(20
o
C). Re-
sistance may be slightly different than listed at different
temperatures. Typically, a failed solenoid coil will either
be shorted (very low or no r esistance) or open (infinite
resistance).
5. If solenoid valve coil resistance is incorrect, replace
solenoid coil:
A. Remove nut securing solenoid coils to the car-
tridge valve. Carefully slide coils off the valve.
B. Install new solenoid coil to the cartridge valve.
Install and torque nut 5ft-lb(6.7N-m). Over- tight-
ening may damage the solenoid coil or cause the
cartridge valve to malfunction.
6. After testing is completed, connect wire harness
connectors to the solenoid coils.
1. Hydraulic manifold
2. Cartridge valve
3. Solenoid coil (lower)
4. Solenoid coil (raise)
5. Nut
Figure 22
5ft-lb
(6.7 N- m)
1
2
3
5
4
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