MAINTENANCE AND SERVICING
169469/169470/169471
192
Revision E
7.11.6 TRACTION DRIVE HYDRAULICS
7.11.6.1 Transmission Oil Pressure
The windrower 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. The charge pressure is
monitored. If it drops below 250 psi (1,725 kPa),
the CDM sounds a tone, and displays a flashing
warning. Refer to Section 5.18.4 Cab Display
Module Warnings and Alarms.
IMPORTANT
Rated charge pressure must be maintained
under all conditions of operation to prevent
damage to the transmission.
If the TRANS OIL PRESSURE warning is
displayed, shut down the engine, and proceed as
follows:
a. Check the hydraulic fluid level in the tank. Refer to
Section 7.11.1 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. Contact your
windrower Dealer.
7.11.6.2 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 to maintain pump control performance,
and to operate the brake release
Check charge pump pressure as follows:
DANGER
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. Attach a 0–600 psi (4,000 kPa) pressure gauge to
a hose that is long enough to allow pressure
gauge to be read from the Operator’s seat.
c. Clean test port fitting, and attach hose to the
fitting.
d. Start engine, and leave at idle. Pressure should be
270 to 300 psi (1,862 to 2,068) kPa) with the
hydraulic oil at 100 °F. (40 °C) minimum.
e. If pressure is not within this range, see your
MacDon Dealer or refer to the technical manual.
Содержание M205 2012
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