ENGINE
4252490-Rev A 3-11
3
Thermostat (Diesel)
Removal and Installation
See Figures 3-15 and 3-16.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Raise the hydraulic oil/fuel tank. (See “Raise
Hydraulic Oil/Fuel Tank” on page 9-4.)
3. Allow the engine to cool completely.
Figure 3-15
!
WARNING
4. Place a suitable clean container, at least 1 gal (3.8 L)
capacity, under the radiator.
5. Remove radiator cap to provide a vent for draining
coolant.
6. Remove plug (1) located on bottom of radiator and
drain approximately 0.5 qt (0.5 L) of coolant from
engine cooling system.
Figure 3-16
7. Loosen hose clamp (2) and disconnect hose (3).
8. Remove two screws (4) and lock washers (5).
9. Remove thermostat housing (8), gasket (6), and
thermostat (7).
Installation Notes
• Install thermostat by reversing the order of removal.
• Clean the gasket surface prior to installation.
• Use a new gasket during installation.
• Fill the radiator with clean water and ethylene glycol
based antifreeze mixed for the coldest ambient
temperature.
Never remove the radiator cap when the coolant
is hot. The engine must be shut down and cooled
before the radiator cap is removed. Very hot
coolant will be sprayed from the radiator if the
cap is loosened before the engine has cooled.
Serious personal injury can occur.
TN3966
1
TN3855
4 5
2
3
8
6 7
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