Cub Cadet Domestic Series 7000 Service Manual page 19

• Shimmy:
Cause 1: Air in steering system.
Solution 1: Repair any leaks in the hydraulic system.
Be aware that a leak on the suction side of the auxiliary
pump would entrain air into the hydraulic fluid, but may
not display significant fluid loss.
Cause 2: Worn mechanical connections.
Solution 2: Inspect the MFD and steering linkage for
sources of excessive play: worn wheel bearings, worn
tie rod ends, worn king pins, worn steering cylinder
mounting points, etc... Replace the worn components.
• Steering Wheel Input Does Not Cause Steer-
ing cylinder to Move:
Cause 1: No fluid in the system.
Solution 1: Fill the system.
Cause 2: Worn steering cylinder / blow-by. Confirm
with flow test in line to cylinder.
Solution 2: Replace the steering cylinder.
• Heavy Impacts to Steering Wheel in Both
Directions:
Cause 1: The hydraulic hoses are incorrectly con-
nected; the hose that should connect to the "P" port is
connected to the " L" port or the "R" port.
Solution 1: Correct the hydraulic connections.
Cause 2: Incorrect setting of the cardan shaft to the
gear wheel (timing).
Solution 2: Internal problem; cardan shaft / gear wheel
timing.
• Slow Steering:
Cause 1: Insufficient fluid flow to the steering unit.
Confirm by testing the out-put of the auxiliary pump.
Solution 1: Repair of replace the auxiliary pump or
delivery line from the pump to the "P" port on the steer-
ing unit.
Cause 2: The priority valve in the steering unit is not
working properly. This valve normally maintains preci-
dence of the steering system over all subsidiary sys-
tems (lift cylinder).
Solution 2: Internal problem; priority valve.
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•
Cause 1: There is a mechanical bind in the steering
column.
Solution 1: Repair or adjust the steering column
(steering shaft) to eliminate the bind.
Cause 2: Bad leaf springs.
Solution 2: Internal problem; leaf springs.
Cause 3: The spool is pressing against the sleeve in
the steering unit.
Solution 3: Internal problem; relief valve causing too
much pressure to build, displacing the spool.
Cause 4: Binding between spool and sleeve caused by
fluid contamination.
Solution 4: Internal problem; contamination. If this is
a possibility, cleaning, fluid replacement, and filter
replacement will help prevent a repeat failure.
•
Cause 1: The "L" and "R" hoses are reversed at their
conections to tht steering cylinder or steering unit.
Solution 1: Correct the connections of the hydraulic
lines from the steering unit to the steering cylinder.
Cause 2: Incorrect setting of cardan shaft to gear
wheel.
Solution 2: Internal problem; cardan shaft / gear wheel
timing.
•
Cause 1: The relief valve is set too low or malfunction-
ing.
Solution 1: Internal problem; relief valve.
•
Cause 1: The seal around the cardan shaft is leaking.
Solution 1: Internal problem; cardan shaft seal.
Cause 2: The port fittings are leaking.
Soluton 2: Replace port adaptors or O-rings. Tighten
the fittings to a maximum torque of 221 in-lbs. (25 NM)
on the "T", "R", and "L" ports. Tighten the fittings to a
maximum of 239 in-lbs. (27 Nm) on the "P", and "E"
ports.
15
Domestic Series 7000 Hydraulics
The Steering Wheel Does Not Return to Cen-
ter:
Steering Action is Opposite of Input:
Steering Power Too Low:
Fluid Leakage: