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Groundsmaster 4000--D/4010--D Page 5 -- 27 Electrical System
Flow Divider and Engine Cooling Fan Switches
The flow divider and engine cooling fan switches are
identical, two (2) position rocker switches that are lo-
cated on the control console (Fig. 29). These switches
have a normal and a momentary position.
The flow divider switch is used as an input for the
TEC--5002 controller to energize the solenoid valve in
the hydraulic traction manifold. When the flow divider
switch is depressed (momentary), traction pump hy-
draulic flow is split between the front wheel motors
(approximately 45%) and rear axle motor (approximate-
ly 55%) to reduce the chance that excessive traction
pump flow goes to a spinning wheel. The flow divider
switch only functions when the machine Hi/Low speed
switch is in the Low speed (4WD) position.
The engine cooling fan switch is used as an input for the
TEC--5002 controller to allow the engine cooling fan to
run in the normal, automatic mode or in the manual, re-
verse (momentary) direction.
Testing
1. Before disconnecting the flow divider or engine cool-
ing fan switch for testing, the switch and its circuit wiring
should be tested as a TEC inputwith the Diagnostic Dis-
play(seeDiagnostic Display inthe Troubleshootingsec-
tion of this chapter). If the Diagnostic Display verifies
thatswitch andcircuitwiring arefunctioningcorrectly,no
further switch testing is necessary. If, however, the Dis-
playdeterminesthatthe switchand circuit wiring are not
functioning correctly, proceed with test.
2. Make sure ignition switch is OFF. Remove key from
ignition switch.
3. Disassemble console arm to gain access to the
switch that is to be tested (see Console Arm Disassem-
bly in the Service and Repairs section of Chapter 7 --
Chassis).
4. Disconnect harness electrical connector from the
switch.
5. With the use of a multimeter (ohms setting), the
switch functions may be tested to determine whether
continuity exists between the various terminals for each
position. The switch terminals are marked as shown in
Figure 30. The circuitry of the flow divider and cooling
fan switch is shown in the chart below. Verify continuity
between switch terminals.
SWITCH
POSITION
NORMAL
CIRCUITS
OTHER
CIRCUITS
NORMAL 2+3 5+6
MOMENTARY 2+1 5+4
6. If switch tests correctly and circuit problem still ex-
ists, check wire harness (see Electrical Schematics and
Wire Harness Drawings in Chapter 10 -- Foldout Draw-
ings).
7. After testing is completed, connect wire harness
connector to the switch.
8. Assemble console arm (see Console Arm Assembly
in the Service and Repairs section of Chapter 7 -- Chas-
sis).
1. Console arm
2. Cooling fan switch
3. Flow divider switch
Figure 29
1
2
3
Figure 30
BACK OF SWITCH
NOTE: Only flow divider and cooling fan switch termi-
nals 1 and 2 are used on Groundsmaster 4000--D and
4010--D machines.
Electrical
System