Hydraulic System - Cub Cadet Hydrostatic Zero-Turn Commercial Riding Mower Professional Turf Equipment Operator's And Service Manual

pin from the clevis pin and pulling the clevis pin from
the brake clevis. Loosen the hex nut and turn the
brake clevis in a clockwise direction one full turn
looking down the brake rod. This will tighten the brake
about .040 inch. Tighten the hex nut and reassemble
the brake clevis to the brake shaft assembly.
Normally, both brakes should be adjusted and equal
amount.
2. Repair: The mower is equipped with internal
wet drum brakes and will not normally require
maintenance. If they are not working properly,
please contact your service center.
F. Hydraulic System
WARNING:
Never overfill the hydraulic units. Damage can
occur if the oil level is not within the proper
operating range.
Note:
hen adding hydraulic oil, do so in
W
small quantities and recheck the oil level
before adding more. It is important that you do
not overfill the reservoir to allow for fluid
expanion.
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 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. Place the drain pan under
the filter and remove the filter by unscrewing in a
counterclockwise direction. The filter will be full of oil,
so empty it into the drain pan. You don't have to drain
the rest of the hydraulic system. Fill the replacement
filter with Shell Rimula 15W40 or equivalent 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
15W40 oil 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 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.
Note:
After unit is up to operating tempera-
ture, 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 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 vac-
uum 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
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 millionths of a meter in diame-
ter. You can help in the battle against dirt by
being very careful when you remove or repair
a component in the hydraulic system. Thor-
oughly 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 work-
ing on the hydraulic components.
Note:
The pumps are not owner-repairable.
If a pump fails, contact your Cub Cadet Com-
mercial dealer. Do not disassemble the pump.
4. Steering Lever Adjustments: Place the
mower on level ground with the engine run-
ning, parking brake off and steering levers
opened out to the neutral position. If the
Mower begins to creep, adjust the Steering
Levers.
If the mower creeps, first determine whether it
creeps to the right or left side and which direc-
22