Lit. No. 41298, Rev. 01 February 15, 2019
60
TROUBLESHOOTING
NOTE: See the System
Overview – 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
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.
SOLENOID COIL ACTIVATION TEST (SCAT)
Harness B Solenoid Coil Connections
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
Solenoid Valve S1 S2 S3
Valve Type 2-Way 3-Way 4-Way
Wire Color White Green Blue
& Red & 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
48615
DS Angle Ram
PS Angle Ram
Lift Ram
Base End
Lift Ram
Rod End
Drop Speed
Adjustment
(CW = Slower)
S1
S2
S3
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.
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