Traction Drive Hydraulics - MacDon M150 2008 Operator's Manual

7.13.6

Traction Drive Hydraulics

7.13.6.1 Transmission Oil Pressure
The windrower tractor transmission consists of
two variable displacement axial piston hydraulic
pumps, one for each drive wheel. The pumps
are driven through a gearbox from the engine.
Each pump requires charge flow to make up for
internal leakage, maintain positive pressure in
the main circuit, provide flow for cooling and
replace any leakage losses from external valving
or auxiliary systems.
monitored and if it drops below 250 psi (1725
kPa), the CDM sounds a tone and displays a
flashing warning.
Warnings and Alarms.
IMPORTANT
Rated charge
maintained under
operation to prevent damage to the
transmission.
If the TRANS OIL PRESSURE warning is
displayed, shutdown the engine and proceed as
follows:
a. Check the hydraulic fluid level in the tank. Refer
to Section 7.13.1 Oil Level.
b. Check the hoses and lines for leakage.
c. Check the charge pressure relief valve. Refer to
following section.
d. If charge pressure still cannot be maintained, do
not operate the windrower.
windrower dealer.
Form # 169017
MAINTENANCE/SERVICE
The charge pressure is
Refer to Section 5.17.4
pressure must be
all conditions of
Contact your
7.13.6.2 Charge Pump Pressure
Incorrect charge pressure settings may result in
the inability to build required system pressure
and/or inadequate loop flushing flows. Correct
charge pressure must be maintained under all
conditions
performance and to operate the brake release
Check and adjust charge pump pressure as
follows:
Stop engine and remove key from ignition
before leaving operator's seat for any
reason. A child or even a pet could engage
an idling machine.
a. Open engine compartment hood fully.
b. Remove cap (A) at fitting.
c. Attach a 0 - 600 psi (4000 kPa) pressure gauge
to a hose that is long enough to allow pressure
gauge to be read from the operator's seat.
Attach hose to the fitting.
d. Start engine and leave at idle. Pressure should
be 270 to 320 psi (1860 to 2205) kPa) with the
hydraulic oil at 100°F. (40°C) minimum.
e. If pressure is not within this range, adjust relief
pressure as follows:
1. Shut off engine and remove key.
2. Remove cap (C) from relief valve (B) for
access to adjustment screw.
188
to maintain pump
DANGER
C
A
(continued next page)
Issue – June 2008
control
B