Greensmaster 3300/3400Page 6 -- 40Electrical System
Hydraulic Solenoid Valve Coils
TheGreensmasterhydrauliccontrolmanifoldsusesev-
eral hydraulic solenoid valve coils for system control.
The lift manifold includes four (4) solenoid valves and
the mow manifold includes a single solenoid valve. On
machines equipped with the Turf Guardian
TM
Leak De-
tector,theleak detectormanifoldincludes asingle sole-
noid valve. When the solenoid coils are energized,
hydraulic valve shift occurs to control hydraulic circuit
flow. Testing of the coils can be done with the coil
installed on the hydraulic valve.
Testing
NOTE: Before disconnecting and testing solenoid
valvecoils,testtheTECcontrolleroutputswiththeDiag-
nostic Display (see Diagnostic Display in the Trouble-
shooting section of this chapter). If the Diagnostic
Display verifies that the TEC outputs are functioning
correctly, consider that a problem with the solenoid
valvecoilor circuitwiring mayexist. Anopen orshorted
controlleroutput(e.g.afailedsolenoidvalvecoil,anun-
pluggedconnectororabrokenwire)cannotbedetected
with theDiagnostic Display.C onversely, ifthe Diagnos-
tic Display verifies that the TEC outputs are not func-
tioning correctly, considerthat aproblem with controller
inputs, controller fuses or the TEC controller may exist.
1. Park machine on level surface, lower cutting units,
stop engine, apply parking brake and remove key from
ignition switch.
2. Determine solenoid coil(s) that are to be tested and
locate coil on correct hydraulic manifold:
A. Remove right side cover next to operator seat to
allow access to lift control manifold.
B. Removeleftsidecovernexttooperatorseattoal-
low access to mow control manifold.
C. To gain access to leak detector manifold, see
Leak Detector Solenoid Valve Assembly in the Ser-
vice and Repairs section of Chapter 5 -- Hydraulic
System.
3. Disconnect harness electrical connector from hy-
draulic solenoid valve coil that is to be tested (Figs. 49,
50 or 51).
NOTE: Prior to taking small resistance readings with a
digital multimeter, short the meter test leads together.
Themetermaydisplayasmallresistancevalue(usually
0.5 ohms or less). This resistance is due to the internal
resistanceofthemeter andtestleads.Subtractthis val-
ue from the measured value of the solenoid c oil being
testing.
1. Hydraulic lift manifold
2. Solenoid valve S1
3. Solenoid valve S2
4. Solenoid valve S3
5. Solenoid valve S4
Figure 49
2
4
5
3
1
1. Hydraulic mow manifold 2. Solenoid valve (PRV)
Figure 50
2
1
To Next Page
Loading...
