Solenoid Coil Activation Test (Scat) - Western HTS Mechanic's Manual

TROUBLESHOOTING GUIDE

SOLENOID COIL ACTIVATION TEST (SCAT)

NOTE: See the System
Overview – HTS™ Controls
section for details on control time
outs and wing functions.
The main purpose of the SCAT is
to narrow down a problem as either
being electrical or hydraulic. Follow
the steps below to diagnose the
problem, then go to the appropriate
test as directed.
1. Verify that harness B is properly
attached to the solenoid coils.
Refer to the labels on the
hydraulic unit and the electrical
schematics in this guide for
details.
2. Install the Diagnostic Harness
(PN 29290-2) according to the
instructions on the following
pages.
3. When instructed to do so, perform
the SCAT test by activating
the control for each function
and checking for magnetic pull
at all three solenoid coils. A
solenoid coil is magnetized if
a screwdriver held nearby is
attracted.
Lit. No. 41467, Rev. 01
4. Compare the SCAT results
with the testing charts on the
following pages.
If the motor relay LED is not
activating when it should, go to
the Motor and Motor Relay Test.
If a coil(s) is not magnetizing
when it should be, you have an
electrical problem. Using a test
light, check the ground wires (not
red) attached to the improperly
acting coil(s) for switched ground
while activating the function that
should energize the coil(s). If
switched ground is not present,
go to the Control/Cable/Plow
Module Test. If switched ground
is present, go to the Individual
Solenoid Coil Test.
5. If the motor relay and all coils
are working properly, you have
a hydraulic problem. Go to the
Hydraulic System Test.
Harness B Solenoid Coil Connections
Lift Ram
PS Angle Ram
Base End
Lift Ram
Rod End
DS Angle Ram
Drop Speed
Adjustment
(CW = Slower)
S3
S2
S1
Solenoid Valve S1 S2
Valve Type 2-Way 3-Way
Wire Color White Green
& Red & Red
Plow Function Active Coil Active Port
Raise S3 Lift Ram, Rod End
Lower/Float S1 Lift Ram, Rod End
Angle Right S2 DS Angle Ram
Angle Left S2 & S3 PS Angle Ram
Torque Specifications
All Solenoid/Check Valves: 19–21 ft-lb
All Solenoid Coil Nuts: 48–60 in-lb
Motor Relay Terminals: Small 10–15 in-lb
Large 25–35 in-lb
Motor Terminals: 25–35 in-lb
April 15, 2021
S3
4-Way
Blue
& Red
66
48615