0.04-0.05 Kgf/ ㎠
(0.57-0.71psi)
Vacuum valve
Opening pressure
1.05 Kgf/ ㎠
(14.93 psi)
Pressure valve
Opening pressure
-Function test:
The pressure type radiator cap has a pressure valve
and a vacuum as shown in the figure.
Both valves are held against there seats by springs
while the pressure in the cooling system remains
within a specified range,thus keeping the cooling
system air-tight.
When the pressure in the radiator rises higher than
the specified valves,it overcomes the force of the
pressure valve spring and open the pressure valve
to release excess pressure through the overflow
pipe as shown in the figure.
FIG.3-8
When the coolant temperature falls enough to
cause the vapor to condense in the cooling system
and decrease the coolant volume,the radiator
pressure becomes negative.When this occurs,the
vacuum valve opens to let outside air into the
radiator as shown in the figure,
thus preventing the radiator from being deformed.
FIG.3-9
6. RADIATOR REASSEMBLY
Reassemble the radiator in the reverse order of
disassembly.
Note:
- The rubber hoses should be clamped securely
and must not interfere with the cooling fan.
- The radiator cores must not interfere with the
cooling fan.
7. DAILY INSPECTION
1) Coolant level inspection and coolant
replacement
When the radiator is hot after operation,be sure
to wait until the coolant cools down sufficiently
before removing the radiator cap.
If this is not done,heated vapor might burst out
and cause burns.Use fresh water from a faucet
as the coolant. When the coolant is replenished
or changed,let the engine idle for a while for the
coolant to circulate sufficiently in the cooling
system and replenish if necessary after stopping
the engine.
2)Antifreeze
When The weather is cold,use an antifreeze to
prevent the engine from freezing.The freezing
point differs according to the mixture ration of
water and antifreeze.Therefore,prepare an
antifreeze solution which will have a freezing
point 5℃ lower than the estimated lowest
atmospheric temperature in your environment.
Precaution for filling antifreeze.
- The radiator interior should be washed clean
ahead of time.
- As concerns of mixing ratio of an antifreeze,
follow its manufacture's instructions.
- Antifreeze should be blended well with water
before filling.
- When the coolant level is lowered due to
evaporation,maintain the level by adding water,
not by using an antifreeze solution.
- When the coolant level is lowered due to leaks,
maintain the level by adding an antifreeze solution
of the same mixing ratio.
- As antifreeze corrodes point,take care not to
spill it on painted parts.
-The tractor is filled with a permanent type
antifreeze (Mobile Long Life Coolant)
when shipping(mixing ratio:50%)
3- 5
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