Cub Cadet Domestic Series 5000, Руководство по обслуживанию

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Domestic Series 5000 Hydraulics
2
1.6. The steering and lift cylinder are also powered
by the a Sauer-Danfoss SNP 1/2.6 S auxiliary
pump.
1.7. The steering unit, located in the dash pedestal
contains it’s own back-up gerotor charge pump
that will enable steering control when the engine
is not running. See Figure 1.7.
1.8. The steering unit directs fluid pressure to one
end of the double-acting differential steering cyl-
inder while allowing it to return from the other
end of the cylinder in order to provide steering
action.
1.9. The lift cylinder is operated by a control valve
under the right rear fender. See Figure 1.9.
1.10. The control valve directs fluid pressure to a sin-
gle-acting hydraulic cylinder that lifts the three-
point lift arms.
1.11. The hydraulic fluid flow is as follows:
1.12. Through the pick-up tube from the transmission
sump and filter, to the auxiliary pump.
1.13. Under pressure from the auxiliary pump the fluid
goes to the hydrostatic drive and to the “P” port
on the steering unit. See Figure 1.13.
1.14. The steering unit distributes pressure to the
steering cylinder according to the position of the
steering wheel. Left turn input from the steering
wheel forces fluid out the port labeled “L” and
allows displaced fluid to return through the port
labeled “R”.
NOTE: The power steering unit is first in line,
and has priority over the rest of the system.
1.15. For left turns, the fluid flows from the L port to
the base end of the steering cylinder. This
causes the ram to extend, turning the wheels to
the left.
1.16. The steering cylinder is double-acting: As the
piston is forced down the length of the cylinder
by hydraulic pressure from the L port, fluid on
the ram side of the piston is displaced, returning
through the R port.
Figure 1.7
Steering
unit
Figure 1.9
Auxiliary pump
Lift control valve
Figure 1.13
L port
(pressure to
turn left)
R port
P port
(pressure
from
pump)
T port
(returns fluid
to transmission)
E port
turn right)
(pressure to
(pressure
lift valve)
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