Cub Cadet THE TANK S7237 - Manual (Page 21)

21
F. Hydraulic System
WARNING:
Never overfill the hydraulic units. Damage can occur if
the oil level is not within the proper operating range.
Note:
W hen adding hydraulic oil, do so in small quan-
tities and recheck the oil level before adding more. It is
important that you do not overfill the reservoir to allow
for fluid expansion.
1. Hoses: Check the hoses from the hydraulic oil tank
to the oil filter to the hydraulic lines daily for leaks
or abrasion and replace any damaged hoses. Make
certain there are no kinks or twists in any hose.
2. Hydraulic Oil Tank and Filter:
Note:
Change the hydraulic oil and the oil filter ele-
ment after the first 50 hours of operation and every
500 hours thereafter.
To drain the hydraulic oil tank, place a 1 gallon drain pan
under the drain plug on the bottom of the hydraulic oil tank.
Remove the drain plug, drain the tank, then replace the plug.
Remove the three screws from the top of the oil filter and
take out the oil filter element You don’t have to drain the rest
of the hydraulic system. Put the replacement filter element in
the oil filter and lubricate the sealing surface. Install the three
screws in the top of the oil filter to secure the oil filter
element. (See photo below)
Note:
Always wipe off the hydraulic tank fill cap
and the area around it before removing the cap to pre-
vent dirt from contaminating the oil.
Remove the fill cap and fill the tank with the same 15W-40
oil and 1.5 ounces of Ornite additive selected for the filter
until the oil level is a 1/4” below the oil tank fill 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 technician.
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 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 produces 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 25 microns or 25 mil-
lionths 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 sys-
tem. 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 fre-
quently when working on the hydraulic components.
Note:
The pumps are not owner-repairable. If a
pump fails, contact your Cub Cadet Commercial
dealer. Do not disassemble the pump.
4. Speed Control Adjustments: The speed control
pedal incorporates a Return-To-Neutral (RTN) fea-
ture 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 pedals are in
the Neutral position, the machine should not creep
(I.E., move in the Forward or Reverse directions of
travel). If this occurs, contact your Service represen-
Screw
Screw