user manual

Groundsmaster 4100--DPage 5 -- 16Electrical System
Cooling Fan Switch
The cooling fan switch is used to control the operation
ofthe hydrauliccooling fanandis locatedon thecontrol
console (Fig. 23). This switch has three (3) positions:
Reverse, Auto and Forward.
When the cooling fan switch is in the normal Auto posi-
tion, cooling fan operation is controlled by the
TEC--5002controller.Inthisswitchposition,ifeitheren-
gine coolant or hydraulic oil temperature is excessive,
thefanwillstopandthenreversedirectiontoallowauto-
matic debris cleaning of the radiator, oil cooler and rear
intake screen. The controller determines the length of
timethatthefanshouldberuninreversebeforefanrota-
tion is returned to the forward direction.
If the operator depresses the cooling fan switch to the
Reverse position, a fan reverse cycle that is controlled
bytheTEC--5002controllerisinitiated.Theswitchauto-
matically returns to the Auto position and fan operation
returnstotheforwarddirectionafterthereversecycle is
completed.
If the cooling fan switch is placed in the Forward posi-
tion, the engine cooling fan will run only in the forward
direction.
Testing
TheswitchterminalsareshowninFigure24.Thecircuit-
ryoftheswitchisshowninthechartbelow.Withtheuse
ofamultimeter(ohmssetting),theswitchfunctionsmay
be tested to determine whether continuity exists be-
tween the various terminals for each position. Verify
continuity between switch terminals.
SWITCH
POSITION
NORMAL
CIRCUITS
OTHER
CIRCUITS
NORMAL 2+3 NONE
REVERSE 2+3 5+6
FORWARD NONE NONE
1. Control console 2. Cooling fan switch
Figure 23
1
2
Figure 24
BACK OF COOLING FAN SWITCH
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