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rest of the hydraulic system. Fill the replacement filter with a good grade of
20W-50 oil and lubricate the sealing surface. Screw the filter onto the filter
base until it seats and then another one-half turn to seal.
Note:
Always wipe off the hydraulic tank fill cap and the area around it before
removing the cap to prevent dirt from contaminating the oil.
Remove the fill cap and fill the tank with the same 20W-50 oil selected for
the filter until the oil level is up to the level of the second hole in the fill
tube. Leave this air space for expansion. Start the engine and let it run at
idle for about five minutes. Check the filter for leaks. Idling the engine and
the pumps in this way will purge any air from the system. Shut off the
engine and recheck the oil level in the tank. Top-off if necessary until the
oil level is up to the second hole n the fill tube.
3.
Hydrostatic Transmissions and motors:
The pumps are the
hardest-working components in the hydraulic system. They are in
operation all the time the engine is running. Because of extremely
close tolerances, wear is an important factor in their life.
Contami-
nants
in the hydraulic oil and
cavitation
does the greatest harm to
the pumps. Cavitation is a blockage in the supply lines that pro-
duces a partial vacuum causing violent bubbling in the hydraulic oil
in the pump.
Check the two suction hoses (the hoses connected to the filter)
daily before starting the engine. Look for a flattened condition or
any leaks and repair or replace as necessary. A flattened or leakng
suction hose will permit cavitation to develop which can destroy the
pumps in a short time.
Contaminants or foreign matter in the oil will also damage the
pumps . To prevent this, use a filter that captures particles as small
as 30 microns or 30 millionths of a meter in diameter. You can help
in the battle against dirt by being very careful when you remove or
repair a component in the hydraulic system. Thoroughly clean off
any component before you work on it. Plug the ends of any hose or
line you remove with a rubber or plastic plug. Use plastic caps to
seal off the ends of hydraulic fittings. Place any component you
remove in a clean plastic bag so it can’t pick up dust or dirt. Clean
your hands frequently when working on the hydraulic components.
Note:
The pumps are not owner-repairable. If a pump fails, call our Service
Department for a replacement. Do not disassemble the pump.
4.
Steering Lever Adjustments:
Place the mower on level ground
with the engine running, parking brake off and steering levers
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