Cub Cadet 5000 Series - Manual (Page 26)

Domestic Series 5000 Hydraulics
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8.30. If the pressure delivered to the control valve is
sufficient, but the pressure delivered to the cylin-
der is low, then the problem is likely to be in the
control valve.
8.31. If the pressure delivered to the cylinder is suffi-
cient, yet the cylinder does not perform ade-
quately, look for leakage from the cylinder.
8.32. If the pressures are O.K., no leakage exists, yet
the cylinder does not perform adequately, there
may be a mechanical bind, or the operator may
be overloading the equipment.
9. LOADER VALVE
9.1. The simplest way to check pressure to the
attachment is by connecting the test kit to the
Quick Disconnect ports. See Figure 9.1.
• The hydraulic lines are arranged as follows, from
the outboard inward when connected to a front-
end loader:
1. Outboard coupling, blue band, boom up.
2. Second coupling in, yellow band, bucket dump.
3. Third coupling in, green band, boom down.
4. Furthest inboard, red band, bucket roll up.
• One female quick disconnect and one male
quick disconnect will be required on the test kit.
• Connect to alternating couplers, eg.: 1 & 3 to
check boom operation, or 2 & 4 to check bucket
operation.
9.2. If the performance problem is isolated to the
movement of one set of cylinders (boom or
bucket), connect the test kit to the set of cou-
plings that is associated with that movement
(1 & 3) or (2 & 4).
9.3. With the test kit installed to test the boom, the kit
loops fluid from one boom connector to the
other. They hydraulic lines that lead to the cylin-
ders that operate the boom will be left discon-
nected. For this test, the kit is not connected in-
line with the cylinders, and the cylinders will not
be in motion during the test.
9.4. After the test kit is connected, confirm that no
unsafe conditions will result from starting the
engine or operating the hydraulic system.
9.5. Open the flow valve on the test kit completely,
then start the engine, and set the throttle to
maintain 3,000 RPM.
9.6. With the test kit installed so that the pressure
gauge is near the boom-down fitting (green band
3d one in), and the flow meter is near the boom-
up fitting (blue band, outboard coupler), pushing
the loader valve forward to the detent will gener-
ate a reading on the flow meter of about 5.0
GPM (19.0 LPM) when the test kit flow valve is
open. Pressure will be zero. See Figure 9.6.
NOTE: Pushing the loader valve lever all the
way forward, past the detent, will put the valve
into “float” mode. This is reflected by a flow
meter reading that falls to zero, and a pressure
gauge reading falls to zero.
NOTE: Pushing the loader valve lever forward,
but not all the way to the detent will produce
readings with less flow, but increased pressure.
Figure 9.1
Figure 9.6
5 GPM Zero pressure