Buhler 2180 - Manual (Page 131)

SECTION 2 - OPERATION
2-85
HYDRAULIC MOTOR APPLICATION
1. Use hydraulic motors designed for Open Center
or Pressure/Flow Load Compensating hydraulic
systems only. Do Not use a hydraulic motor
designed for closed center hydraulic systems
unless it is adapted for use by removing the inlet
restrictor.
2. Rating: Hydraulic motors up to 1.26 L/SEC (20.0
GPM US) @ 15.50 MPa (2250 PSI) can be used.
3. Be sure the hydraulic motor does not have
restrictors in the ports or fittings.
4. Hydraulic motors less than 0.63 L/SEC (10 GPM
US) may be equipped with 12.7 mm (1/2″) ID
hoses and standard (ASAE/SAE/ISO) couplers.
5. Hydraulic motors greater than 0.63 L/SEC (10
GPM US) should be connected with (3/4″ ) hoses
and (ASAE/SAE/ISO) couplers to prevent
excessive restriction and heat generation.
6. It is recommended that the low pressure return
line kit (described earlier in this section) be
installed. The use of the low-pressure return
circuit will reduce back pressure in the remote
hydraulic return line which will result in more
efficient hydraulic motor operation. The low-
pressure return circuit can also be used in
applications where low return oil pressure is
desired to improve implement operation such as
with orbit motor case drain lines, or implement
mounted hydraulic control valves.
OPERATING REMOTE EQUIPMENT
SIMULTANEOUSLY OR REMOTE
EQUIPMENT AND HYDRAULIC LIFT
SIMULTANEOUSLY
NOTE: Hydraulic pump output varies with engine
speed. Oil flow will be relatively constant in the
remote control valve circuits if the flow control is used
to provide reduced oil flow, thus providing constant
operating speed for hydraulic motors, etc. even if
engine speed varies. Maintain the engine speed
above the minimum required for simultaneous
operation of all required circuits and vary ground
speed by selection of the appropriate gear.
If operating two or more remote control valves
simultaneously or remote valves and hydraulic lift, all
the flow control knobs should be adjusted to provide
a partial flow. Otherwise, all the available flow may be
directed to the full flow circuit when the pressure in
that circuit is less than that of the other circuits in use.
BLEEDING REMOTE CYLINDERS
When connecting a cylinder with trapped air, i.e., a
new cylinder, one that has been out of service or one
that has had the hoses disconnected, it will be
necessary to bleed the cylinder to remove the air.
With the hoses connected to the remote control valve
couplers at the rear of the tractor, position the
cylinder with the hose end uppermost and extend
and retract the cylinder seven or eight times using the
remote control switch. Check the rear axle oil level
before and after operating the remote cylinder.
POWER BEYOND APPLICATIONS
All BVI Genesis tractors are “Power Beyond” ready
in that another closed center load sensing valve may
be incorporated with the Genesis closed center load
sensing hydraulic system.
The pressure for the Power Beyond is obtained from
the (1”) ORB port, 1, (1 5/16--12 thread) on the top
cover of the valve. If the tractor is equipped with
HydraFlow Plus, replace the elbow fitting located at
port 1 with a tee fitting to access the supply pressure.
The sense line is attached to the (1/4”) ORB port, 2,
(7/16 -- 20 thread) located on the rear face of the
valve end cover.
The return line from the external valve would go to the
low pressure return port on the HPL cover. This is
explained earlier in this section.
125