Cub Cadet 8404 - Manual (Page 36)

CHAPTER 2 8354/8404
2-14 D615-W02 May-2003
615W227A
615W226A
615W225A
D. RADIATOR
The radiator core consists of water carrying tubes (2)
with fins (3) at a right angle to it. The water in the radia-
tor is cooled by the air flowing through between the
tube wall and the fin.
E. RADIATOR CAP
The pressure type cap is installed on the radiator, which
prevents the pressure difference between the inside
and the outside of the radiator from deforming the radia-
tor.
(A) At High Pressure
(Higher than 88 kPa (0.9 kgf/cm², 13 psi)
When the water temperature rises and the pressure in
the radiator increases above the specified pressure,
the pressure valve (1) opens to reduce the internal
pressure.
(B) At Low Pressure.
When the water temperature falls and a vacuum is
formed in the radiator, the vacuum valve (2) opens to
allow the water to enter the radiator.
C. THERMOSTAT
The thermostat is wax pellet type, which controls the
flow of the cooling water to the radiator to keep the
proper temperature. The case has a seat (1) and the
pellet has a valve (2). The spindle attached to the case
is inserted into the synthetic rubber in the pellet. The
pellet is charged with wax.
(A) At Low Temperature (Lower than 71 °C (160 °F)).
The valve (2) is seated by the spring (7) and the cool-
ing water circulates in the engine through the water
return pipe but does not enter the radiator.
(B) At High Temperature (Higher than 71 °C (160 °F)).
As the water temperature rises, the wax in the pellet (3)
turns liquid and expands, repelling the spindle.
The pellet lowers and the valve (2) opens to send the
cooling water to the radiator.
(1) Seat (6) Wax (Solid)
(2) Valve (7) Spring
(3) Pellet (8) Leak Hole
(4) Spindle (9) Wax (Liquid)
(5) Synthetic Rubber
(1) Pressure Valve (2) Vacuum Valve
(1) Cooling Water (3) Fin
(2) Tube