Steering Pump And Cylinder - Cub Cadet Domestic Series 5000 Service Manual

Domestic Series 5000 Hydraulics
7.

STEERING PUMP AND CYLINDER

NOTE: It is normal for the spokes of the steering
wheel on an open-center hydrostatic power
steering system to change orientation with use.
There is no mechanical connection between the
steering wheel and the front wheels.
7.1. Identification: The Sauer OSPM 63 PB unit has
a round body. The ports are on the bottom of
the steering unit connecting to the hydraulic lines
with male straight thread O-ring seal fit-
tings. See Figure 7.1.
Figure 7.1
7.2. The ports are arranged as follows:
• P Pressure from the auxiliary pump.
• T Tank return of fluid pressure and volume not
required by the steering system.
• E Equipment power for accessories.
• R Right turn, pressure out when turning right.
• L Left turn, pressure out when turning left.
7.3. R&R: instructions for removal and replacement
of the steering units can be found in the DASH
PANEL AND STEERING PUMP section of this
manual.
7.4. If there is a warrantable problem with the power
steering unit, it is to be replaced as a complete
unit. Cub Cadet does not stock any internal
components for the steering units.
K&T Saw Shop 606-678-9623 or 606-561-4983
www.mymowerparts.com
7.5.
•
Cause 1: The auxiliary pump is not supplying suffi-
cient fluid to the steering unit. Confirm by testing auxil-
iary pump out-put.
Solution 1: Correct the problem with the auxiliary
pump.
Cause 2: The priority spool within the steering unit is
not moving, causing fluid to be directed to other parts
of the system when the steering system needs it.
Solution 2: Internal problem; priority spool.
Cause 3: The relief valve in the steering unit is stuck
open.
Solution 3: Internal problem; relief valve.
•
Cause 1: Bad leaf spring in steering unit.
Solution 1: Internal problem; leaf spring.
Cause 2: The relief valve is stuck open.
Solution 2: Internal problem: relief valve.
•
Cause 1: There is a bind in the steering column.
Solution 1: Binds may be created by angular or radial
misalignment between the steering column and the
steering unit. Binds may also be created by a lack of
axial clearance between the steering column and the
steering unit. Correct any situation that may create
friction or binding in the steering column.
Cause 2: Bad leaf spring in steering unit.
Solution 2: Internal problem; leaf spring.
14
The following set of symptoms, causes, and
solutions has been adapted from a list compiled
by Sauer-Danfoss to aid in the diagnosis of
hydrostatic steering issues. Internal steering
unit problems are described to aid technicians in
distinguishing internal steering unit problems
from problems that lie elsewhere in the system.
Internal problems dictate replacement of the
steering unit.
High Effort Required to Turn Steering Wheel:
"Motoring" Steering Wheel: rotates on its
own:
Poor Straight Line Steering Characteristics: