Cub Cadet Domestic Series 7000 Service Manual page 27

9.10. Observe the flow rate. It should be in the 6.5
GPM (25 L/m) range. See Figure 9.10.
25 L/m flow
Figure 9.10
9.11. Set the throttle to maintain 1,200-1,500 RPM,
and observe the flow rate.
9.12. Close the valve on the test kit until it is confirmed
that the pump will generate at least 1,500 PSI
(103 Bars). Observe the flow rate.
See Figure 9.12.
Flow
remains
steady
Flow valve partially closed
Figure 9.12
• The flow rate should not be significantly reduced
from the initial 1,200-1,500 RPM observation by
the increase in pressure.
• Like the auxiliary pump, the tandem pump is
capable of generating pressure well in excess of
the intended operating pressure of the rest of the
system.
Flow valve open
No pressure
Pressure builds
Domestic Series 7000 Hydraulics
• System pressure is regulated by a relief valve in
the loader valve.
• In this test, we have effectively disabled that
relief valve. Use caution not to overload the
system by closing the valve farther or longer
than necessary to test pump performance.
9.13. If the tandem pump fails to perform as specified,
confirm that the problem is not due to external
factors such as:
• Insufficient or incorrect working fluid.
• Blocked filter.
• Pump drive failure.
• Crushed, kinked, or blocked suction tube.
• Crushed, kinked or blocked return path.
9.14. If external factors do not account for the lack of
performance, replace the tandem pump.
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