Buhler 2425 - Manual (Page 192)

SECTION 2 - OPERATION
2-134
HYDRAULIC MOTOR APPLICATIONS
The hydraulic system is a load sensing, pressure
and flow compensating system. Pressure and
flow are regulated by a load sensing line from the
implement valve. For proper and efficient use of
the system, low volume open center hydraulic
motors or closed center system motors with
restricting orifices removed and bypass valve
closed should be used. Motor speed must be
regulated with tractor implement valve flow
control rather than bypass valves and orifices at
the motor. This will reduce heat buildup, save oil
for other simultaneous operations of the
implement valve, and increase system reliability.
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 restricter.
2. Be sure the hydraulic motor does not have
restricters in the ports or fittings.
3. Hydraulic motors rated at less than 37.85
L/min (10 US GPM) may be equipped with
12mm (1/2″) ID hoses and standard
(ASAE/SAE/ISO) couplers.
4. Hydraulic motors rated at greater than 10 US
GPM (37.85 L/min) should be connected with
19mm (3/4″) hoses and (ASAE/SAE/ISO)
couplers to prevent excessive restriction and
heat generation. Use the optional 19mm
(3/4″) coupler kit P/N 86010513 available
from your Buhler Versatile dealer. See
“Optional Hydraulic Equipment” later in this
section for more information on this kit.
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 valve 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 ratio.
If operating two or more remote control valves
simultaneously or remote valves and 3-point hitch,
the flow control should be adjusted to provide a
partial flow to each valve circuit. (The hydraulic
system of the tractor is designed to provide
adequate oil flow to the implement valve to satisfy
system demand, regardless of the number of
valve sections that are activated (i.e., running an
air seeder fan motor and lifting the cultivator).)
By adjusting the flow control of each valve
section, the system performance will be
maximized and will show up as proper
performance of the implement functions.