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Groundsmaster 5900/5910Page 3 -- 26Diesel Engine
Thermostat
Figure 23
1. Water pump
2. Seal
3. Thermostat
4. Gasket
5. Thermostat housing
6. Flange head screw (2 used)
14 ft--lb
(19 N--m)
3
1
2
4
5
6
Removal (Fig. 23)
1. Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake and remove
key from the ignition switch.
2. Raise and support hood to allow access to engine.
CAUTION
Do not open radiator cap or drain coolant if the
radiator or engine is hot. Pressurized, hot cool-
ant can escape and cause burns.
Ethylene--glycol antifreeze is poisonous. Dis-
pose of coolant properly, or store it in a properly
labeled container away from children and pets.
3. Draincoolantfromradiatorandengine(see Radiator
Removal in this section).
4. Remove upper coolant hose from thermostat hous-
ing.
5. Removetwo (2) flange head screws thatsecurether-
mostat housing to water pump. Remove thermostat
housing.
6. Removethermostatandsealfromwaterpump hous-
ing.
7. Clean gasket surfaces of pump and thermostat
housing.
8. Inspect thermostat sealing areas in pump housing.
Thoroughly clean sealing s urfaces if any corrosion or
debris buildup is evident.
Thermostat Testing
1. Remove the thermostat (see Water Pump, Hose,
Pipe and Thermostat Removal and Installation).
2. Suspendthethermostatand a thermometer in a con-
tainer of water (Fig. 24). For accurate test results, do not
allow the thermostat or thermometer to contact the con-
tainer.