Cooling System - HUSTLER 3700 Operator's Manual

element slides over the safety filter. NOTE: For maximum
engine protection and air cleaner service life, install a new inner
safety element every third primary element change or after
every 1000 hours of operation, whichever comes first.
NOTE: The safety filter does not require servicing unless it
becomes contaminated with dirt or moisture.
Recommended service procedure
1. Release clamps and remove element. Clean the canister
with a damp cloth.
2. Before installing a new element, inspect it by placing
a bright light inside and rotate the element slowly,
looking for any holes or tears in the paper. Also check
gaskets for cuts or tears.
damaged element which will allow abrasive particles to
enter the engine.
3. Install the new element and reinstall the dust cup.
Make sure it seals all the way around the air cleaner body,
then tighten the clamps.
4. Check all fittings and clamps periodically for tightness
and inspect hoses for holes or cracks.
5. Periodically check the intake hose for signs of ingested
dust. Locate and repair the source of ingested dirt.
6. Never operate a machine without an air filter installed.
Overservicing
Overservicing occurs when an air filter element is removed
for cleaning or replacement before it is necessary. Each time the
filter is removed a small amount of dirt and dust could fall in the
intake system. This accumulated dirt can cause a dusted engine.
It only takes a few grams of ingested dirt over the normal
service life of an engine to cause a dusted engine.
Do not clean element, replace with a new element only.
Cleaning used air filter elements, through improper cleaning
procedures, can get dust on the inside of the filter causing dirt
ingestion and engine failure.
It is important to note that whenever an air filter element is
cleaned by any method, the person or company performing the
cleaning assumes responsibility for the integrity of the filter
from then on. The warranty for air filters expires upon
cleaning or servicing in any manner because the condition of
the filter after servicing is completely out of their control.
Therefore, on a dust ingested engine failure, there will be no
warranty consideration if the air filter element has been
cleaned or serviced in any manner.
A partially dirty air filter element works better than a new
element. Therefore, a dirty filter element is not bad for the
engine unless it is excessively restricting the air flow and engine
performance is affected. The reason is simple. The media in the
filter must be porous to allow air to pass through it. When dirty
air passes through the filter, the dirt plugs some of the holes in
the media and actually acts as part of the filter media. When the
next round of dirt enters, the first dirt helps filter out even
smaller particles making the filter more efficient at stopping dirt
from entering the engine. This is referred to as barrier filtration.
Of course, at some point the filter media becomes too clogged
to allow air to pass.
The mowing conditions will determine the frequency of air
filter element changing.
109627CE_0512
Do not attempt to use a
4-9
Air filter
Figure 4-16

Cooling system

IMPORTANT: Any maintenance operation that requires the
removal of safety covers must be performed by a trained service
technician.
The 3700 engine must operate at the correct temperature to
obtain maximum efficiency and service life. This is dependent
on the cooling system.
Always fill the system with a 50/50 solution of permanent
antifreeze and clear water.
Checking the coolant level
WARNING: Always wear eye protection when ser-
vicing the cooling system.
NOTE: Visually inspect the system daily prior to operating
power unit. Be sure the engine is level. Open the hood, and
check the coolant recovery reservoir located next to the battery.
Check the coolant level only when the system is cold. Check
the coolant level only at the overflow reservoir (Figure 4-16).
The cooling system is a closed type. Never open the radiator
cap. Doing so may induce air into the cooling system and may
cause overheating. The coolant level should be between the low
and full marks on the reservoir.
If the coolant recovery reservoir is low, refill system, with the
proper coolant mixture, through the recovery reservoir. It is not
necessary to remove the radiator cap to replenish the coolant.
Engine cooling is accomplished with a 50/50 mixture of clear
water and Ethylene Glycol (anti-freeze). This mixture will
provide freeze protection to -34° C.
The radiator is equipped with a pressure cap and overflow
reservoir.
REV F