Cub Cadet 5000 Series - Manual (Page 22)

Domestic Series 5000 Hydraulics
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8. HYDRAULIC LIFT CYLINDER AND CONTROL
VALVE
8.1. If the hydraulic lift cylinder does not work or is
low on power, begin by making a visual inspec-
tion of the valve, cylinder, linkage, and hydraulic
hose. See Figure 8.1.
8.2. The outboard plumbing and linkage connections
to the control valve are visible beneath the
fender. More complete inspection, diagnosis,
and service require fender removal.
8.3. The lift cylinder and the hydraulic hose that con-
nects it to the control valve are visible beneath
the left fender. See Figure 8.3.
8.4. If the lift cylinder is operable, run it through the
full range of travel to confirm that the feedback
rod is working correctly. Normal operating char-
acteristics include:
• The the lift arms move up when the control lever
is moved back. The lift arms move down when
the control lever is moved forward.
• In all positions, the lift cylinder will apply only
upward force to the lift arms. It is a single-acting
cylinder.
• Downward travel is not under hydraulic force,
and is only caused by the weight of the lift arms
and any accessories mounted to them.
• At any point in their travel, the lift arms may be
manually lifted beyond the point that the hydrau-
lic system is holding them at. They will always
“float”.
• Because the steering system has priority over
the lift cylinder, it is normal for the lift cylinder to
have less power when the steering system is in
motion.
8.5. Orientation of the valve: See Figure 8.5.
• The flexible line to the outboard side of the valve
provides pressure from the steering pump.
• A flexible line from the bottom of the valve con-
nects it to the lift cylinder.
• The steel line leading rearward from the front
port on the valve carries fluid directly back to the
transmission housing (reservoir).
• The steel line leading forward from the rear port
on the valve directs fluid to the return manifold,
and back to the transmission housing.
Figure 8.1
Pressure line from E port
Line to
cylinder
Direct return to
transmission
Return through
check valve
Figure 8.3
Cylinder end of line, behind left wheel
Valve end of line
to cylinder
Figure 8.5