Thermostat; Fan Belt - New Holland TC21D Operator's Manual

Thermostat

The thermostat is a heat-sensitive valve located in
the coolant outlet connection in the front of the
cylinder head.
When the engine is cold, the thermostat shuts off the
flow of coolant to the radiator, allowing for rapid
engine warm-up. A recirculating bypass allows
coolant to circulate inside the engine whenever the
thermostat shuts off flow to the radiator.
IMPORTANT: Do not attempt to improve cooling by
removing the thermostat. This will cause the engine
to run below normal working temperatures, resulting
in excessive engine wear.
To install a new thermostat, 1, position it in the recess
of the water outlet connection so that the heat
element (spring end) is in the cylinder head of the
engine.

Fan Belt

NOTE: Check the condition of the fan belt after every
50 hours of operation. Check fan belt tension after
every 200 hours of operation.
A belt-driven fan located at the front of the engine
draws air through the fins of the radiator to lower the
temperature of the radiator coolant.
When 9-11 kg (20-25 lbs.) of thumb pressure is
applied midway between the belt pulleys, a correctly
tightened belt will deflect
(7/16"-9/16").
If the fan belt is slipping, fan efficiency is lowered,
resulting in the engine running too hot. If the belt is
too tight, the life of the alternator bearing will be
shortened. If the fan belt shows signs of cracking or
fraying, install a new one.
SECTION 3 - LUBRICATION AND MAINTENANCE
10 mm-15 mm
3-17
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