Service manual

22
neck. Leave this air space for expansion. Start the
engine and let it run at low 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 a 1/4” below the
oil tank fill neck.
This unit is equipped with two traction drive pumps and
one pump for steering and implement lift.
Note: After unit is up to operating temperature,
turn off engine and re-check hydraulic oil. If oil
appears foamy or contains excessive air bubbles,
DO NOT OPERATE UNIT. Contact service techni
-
cian.
3. Hydrostatic Pumps 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 impor
-
tant factor in their life. Contaminants in the
hydraulic oil and
cavitation does the greatest
harm to the pumps. Cavitation is a blockage in
the supply lines that produces a partial vacuum
causing violent bubbling in the hydraulic oil in
the pump.
Check the two suction hoses (the hoses con-
nected to the filter) daily before starting the
engine. Look for a flattened condition or any
leaks and repair or replace as necessary. A flat
-
tened or leakng suction hose will permit cavita-
tion 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 25
microns or 25 millionths of a meter in diameter.
You can help in the battle against dirt by being
very careful when you remove or repair a com
-
ponent 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 com
-
ponents.
Note: The pumps are not owner-repairable. If
a pump fails, contact your Cub Cadet Commer
-
cial dealer. Do not disassemble the pump.
4. Speed Control Adjustments: The speed con-
trol pedal incorporates a Return-To-Neutral
(RTN) feature to provide smooth, non-jerkey,
control motion while affording an automatic
hydrostatic braking means.
Whenever the Park Brake is in the engaged
position, a cable mechanism, connected to
each drum brake on the hydrostatic wheel
motors, applies force to each brake lever so that
each wheel brake mechanism can prevent
brake drum and wheel rotation.
Note: The engine should be able to be started
whenever the Park Brake is applied, and the
speed control pedals are in Neutral.
Whenever the machine is on level ground with
the engine running and the speed control ped
-
als are in the Neutral position, the machine
should not creep (I.E., move in the Forward or
Reverse directions of travel). If this occurs, con
-
tact your Service representative for the proce-
dure to reset the RTN mechanism on the
hydrostatic pumps. If the hydrostatic pump RTN
is adjusted, the control linkage must also be
readjusted.
G. Storage
1. General: If your mower will not be in service for
a few months, it should be stored in a dry loca
-
tion that is not subject to drastic changes in tem-
perature. Do not store in areas where heaters,
furnaces, or electrical appliances are present.
Before storing, the following maintenance pro
-
cedures should be performed.
Note: For E.F.I. Tanks, disconnect the nega-
tive lead of the battery for storage of 4 weeks or
more.
a. Clean the mower. The entire tractor and cut-
ting deck should be washed and cleaned.
b. Sharpen the blades so that the mower will be
ready to use when needed.
c. Protect the metal surfaces. Repair scratches
with the appropriate touch-up spray paint.
Brush a rust preventive oil on any unpainted
surfaces including the pulleys and blades.
(Be careful not to get any oil on the drive
belts.)
d. Lubricate the mower.
e. Drain the engine oil. The engine should be
warm so that all the oil drains. Replace the
engine oil filter and refill the crankcase with
fresh oil.
f. Gasoline Engine: Drain all the fuel. Close the
fuel tank shutoff valve. Disconnect the fuel
line from the carbuetor and put the end into
an approved fuel container. Open the fuel
tank shutoff valve and drain the fuel tank and
line into the approved container. Replace the