HUSTLER 3700 Operator's Manual page 38

DANGER: Never remove radiator cap or overflow
reservoir cap when engine is hot. Pressurized hot
steam and water may be released, causing serious
burns or possible blindness.
The cooling system operates under pressure con-
trolled by the radiator cap.
remove the cap while the system is hot. Always
cover the cap with a thick cloth and turn it slowly
counter-clockwise to the first stop. Allow all pres-
sure to escape before removing the cap completely.
Be sure that the radiator fins are clear of chaff and dirt to
allow free air movement.
Radiator
screen
Coolant
recovery
reservoir
Figure 4-17
Draining and flushing the cooling system
NOTE: Drain and flush the radiator and engine block
every 12 months. Refill with a 50/50 mixture of permanent
antifreeze and clear water.
WARNING: Allow the engine and radiator to cool
before draining and flushing the system.
To drain the cooling system:
1. Use a suitable receptacle to catch the used coolant.
Remove the radiator cap and open the drain valve to
drain the radiator and engine block. Figure 4-18
2. After the coolant has drained, place a water hose in the
radiator filler neck and run water through the system.
When water is flowing from the block drain valve, start
the engine. When the water flowing from the drain
valve, is free of discoloration and sediment, stop the
REV F
3. Close the drain valve and slowly refill the system with
It is dangerous to
4. Clean the radiator cap and cap seal and install the cap.
5. Fill the coolant recovery reservoir bringing the fluid
6. Open the front screen and remove chaff, dust, or other
7. Pull out on the radiator screen and clean it. Figure 4-17
8. Run the engine until normal operating temperature is
IMPORTANT: Never run the engine when the cooling
system is empty. Do not add cold water or cold antifreeze
solution if the engine is hot.
4-10
engine and remove the hose. Allow all water to drain
from the system through the drain valve.
a 50/50 solution of permanent antifreeze and clear
water. Fill until the coolant level is approximately
3.8cm-5cm below the bottom of the filler neck. Do not
fill beyond this level.
Figure 4-19
level up until it is between the full and low marks on
the reservoir.
foreign substances. The foreign substances can be
dropped onto the ground through the rubber at the
lower part. Figure 4-20
reached, then stop the engine. Recheck the coolant
level when the engine is cold and add additional
coolant as necessary.
Drain valve
Figure 4-18
Radiator
109627CE_0512