Auxiliary pump, Domestic series 5000 hydraulics – Cub Cadet 5000 Series User Manual
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Domestic Series 5000 Hydraulics
12
6.
AUXILIARY PUMP
6.1.
The auxiliary pump provides pressure for the
hydrostatic power steering unit, the lift cylinder
attached to the three-point hitch, and any
hydraulic-driven accessories that may be
installed on the tractor.
6.2.
Series 5000 tractors come with a single auxiliary
pump mounted to the right side of the transmis-
sion. See Figure 6.2.
6.3.
If performance of any of the tractors hydraulic
features or attachments is poor, it is necessary
to confirm that sufficient hydraulic power is being
supplied by the pump that drives it.
6.4.
Begin with the basics: confirm that the pump
drive and supply are intact before drawing con-
clusions about the pump itself by making these
preliminary checks:
•
Check the fluid. If the fluid level is low, or the
fluid is not the correct type, both the hydrostat
and the auxiliary pump will perform poorly.
•
Replace the hydraulic filter if there is any ques-
tion of its condition.
•
Confirm that the suction tube that provides fluid
to the auxiliary pump from the sump of the trans-
mission is not crushed or kinked, and that the
connections are free of leaks.
6.5.
The filter and suction tubes are easily reached
for inspection with little or no disassembly.
See Figure 6.5.
6.6.
The rear fenders must be removed to access the
auxiliary pump itself. Fender removal is
detailed in the 2004 Cub Cadet Technical C.D.
6.7.
To test the auxiliary pump, use a flow and pres-
sure gauge set. See Figure 6.7.
NOTE: Equipment will vary from shop to shop,
but operating principles are similar.
6.8.
Disconnect the output line from the top of the
pump using a 3/4” wrench and a 9/16” wrench.
6.9.
Install the gauge set in-line between the auxiliary
pump and the steering pump. The pressure
gauge should be near the auxiliary pump, and
the flow meter should be near the steering unit.
Figure 6.2
Auxiliary pump
Pressure line to P port
on steering unit
Figure 6.5
Hydraulic filter
Suction tube
to auxiliary
pump
Figure 6.7
To P port
From pump