Cub Cadet 5000 Series - Manual (Page 23)

Domestic Series 5000 Hydraulics
19
8.6. Fluid movement:
• Fluid is constantly circulating from the auxiliary
pump, to the steering unit, through the valve,
then to the return manifold.
• When the valve is actuated to raise the lift arms,
it redirects fluid from this path to the lift cylinder.
• When the valve is actuated to lower the lift arms,
fluid is allowed to empty from the lift cylinder
through the valve, into the steel line leading from
the top of the valve to the transmission cover.
8.7. Control Linkage Description: The operator con-
trol handle pivots on a bracket bolted to the
frame. A pin on the valve link engages a slot in
the handle, above the handle pivot point. The
ratio of travel varies with the position of the han-
dle, but when the pin is centered in the slot there
is a 10:1 ratio between the movement of the
handle and the movement of the pin. The top of
the valve link pivots on the valve mounting
bracket. Between the pin and the fulcrum is a
connection to the tubular link. There is a 3:1
ratio between the movement of the valve link
and the movement of the tubular link.
8.8. The effective movement ratio of 30:1between
the handle and the input to the control valve
allows precise movement of the three point lift
without the complexity of the shifting fulcrum
linkage used on the domestic Series 7000.
8.9. The category 1 three point hitch system on the
domestic Series 5000 tractor should be capable
of lifting 950 lbs. (430 Kg.), 24 in. (61 cm.)
behind the hitch. If it does not perform as
designed, use the following procedure to diag-
nose it.
Figure 8.7
Control handle
Pin
Tubular link
Bracket
8.10. Confirm that the lift cylinder control valve is get-
ting pressure from the steering pump:
• Remove any rear mounted attachments that are
supported by the lift arms or will interfere with
access to the lift cylinder and control valve.
• Remove the rear fenders.
• Lift and safely support the rear of the tractor.
• Remove the right rear wheel using a 21mm
wrench.
• Lower the lift arms to the bottom of their travel,
and confirm that the lift cylinder is fully retracted.
• Disconnect the flexible hydraulic line from the
bottom of the control valve using a 3/4” wrench
and a 5/8” wrench.
• Install the test kit with the flexible line connected
to the pressure gauge end of the kit, and the
control valve connected to the flow meter end of
the kit. See Figure 8.10.
8.11. Confirm that the test kit valve is all the way open,
and that no unsafe conditions will arise from
starting the tractor engine.
8.12. Start the engine, warm-up the engine and
hydraulic system, then position the throttle to
3,000 RPM.
Figure 8.10
From E port
To control valve