Mahindra 3535, Operator'S Manual

Page: 65 / 108

35 Series-HST, Model - 3535, 4035, 4535 & 5035
64
When straightening bent fins be careful not to
damage the tubes or to break the bond
between the fins and tubes.
Maintenance
Cooling System
The cooling system consists of :
A. Radiator
B. Surge Tank
C. Fan
D. Thermostat
E. Water Pump
F.
Fan Belts
G. Hoses & Connections
To ensure an even temperature within the engine, the
cylinder head and cylinder walls of the engine are water
cooled. This water is in turn cooled in the radiator. The
water is circulated from the radiator to the engine and back
through the radiator by means of a water pump.
Radiator
The radiator consists of a cluster of hollow tubes enshrined
into a number of fins and enclosed at both ends vide a Top
Tank and a bottom tank.
Air sucked by Fan passes through the radiator fins thereby
cooling the coolant flowing through radiator tubes.
The fins should be kept clear of mud or dirt accumulation.
Over heating may be caused by bent or clogged radiator
fins. If the spaces between the radiator fins become
clogged, clean them with compressed air or coolant blown
from engine side.
Radiator Cap
A pressurised radiator cap is provided which is set at 13 psi
(0.9 kg/cm
2
) pressure. This cap ensures better cooling and
avoids loss of coolant due to evaporation. It also reduces
corrosion in engine sleeve & crankcase, hence it is strongly
recommended that the engine should not be run without
radiator cap. Also ensure that rubber gasket is intact &
perfectly sealing the system pressure.
Surge Tank
When the engine is in operation, certain amount of coolant
passes out of the radiator overflow pipe. This coolant is not
allowed to escape into the atmosphere and captured into a
Surge tank.
When the engine is not operating and the coolant cools
down, certain amount of coolant comes back into the
radiator from surge tank. The surge tank thus helps to
prevent loss of coolant.
Thermostat
This device prevents coolant circulating through the
radiator until the engine reaches its operating temperature.
With the thermostat closed, the coolant circulates only
through the engine block.
It is important that if the thermostat is defective, do not
attempt to repair it, replace with new. When installing a
new thermostat, ensure the valve is facing upward. The
thermostat operating temperature is 180
0
F.
The cooling system operates under pressure.
It is dangerous to remove the radiator cap
while the system is hot.
Always turn the cap slowly to the first stop,
and allow pressure to escape before
removing the cap completely.
Do not run the engine when the cooling system
is empty, and do not add cold coolant or cold
antifreeze solution if the engine is hot.
The coolant level in surge tank should not fall
below the MIN level mark.
Do not run the Engine without Thermostat
Valve.