Cub Cadet Domestic Series 7000 Service Manual page 20

Domestic Series 7000 Hydraulics
7.6. Engine-off test: With the engine turned-off so
that no pressure is supplied by the auxiliary
pump, the pump within the steering unit should
work well enough in manual mode to turn the
front wheels from one steering stop to the other
(full travel) with roughly 2.75 turns of the steering
wheel.
NOTE: The tractor was engineered to comply
with German TUV directive #38stVZo. It will pro-
vide steering action without pressure from the
auxiliary pump, maintaining steering wheel force
within a specified limit.
7.7. If there is air in the system, it will not perform to
design intent:
• If there are any leaks in the steering hydraulics,
air will be drawn into the system, degrading pre-
formance.
• If the system has been disassembled for any
reason, the engine must be started to provide
pressure from the auxiliary pump. With auxiliary
pump pressure to assist, turn the steering wheel
lock-to-lock three times, to purge air from the
steering system.
• After the air is purged, the engine-off test can be
performed with validity.
7.8. If the hydraulic steering lacks speed, test the
auxiliary pump as described in the previous sec-
tion of this manual.
7.9. Once it has been established that the auxiliary
pump is developing enough flow and pressure,
then test the steering unit.
7.10. Install the hydraulic test kit in either one of the
two hydraulic lines leading from the steering
pump to the steering cylinder.
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7.11. Disconnect the hydraulic line between the steer-
7.12. Connect the test kit so that the pressure gauge
7.13. Confirm that the test kit valve is all the way open,
7.14. Start the engine, warm-up the engine and
16
ing unit and the steering cylinder using a 5/8"
wrench and a 3/4" wrench. See Figure 7.11.
Hydraulic line
(pressurized
to turn right)
Hydraulic line
(pressurized
to turn left)
Steering cylinder
Figure 7.11
side (as opposed to the flow meter side) is near
the source (steering unit). See Figure 7.12.
Pressure test kit
installed in right
turn hydraulic line
Figure 7.12
and that no unsafe conditions will arise from
starting the tractor engine.
hydraulic system, then position the throttle to
1,200-1,500 RPM.