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MAINTENANCE/SERVICE
169304 158 Rev. C
57.9.6 Traction Drive Hydraulics
57.9.6.1 Transmission Oil Pressure
The windrower transmission consists of two
variable displacement axial piston hydraulic
pumps, one for each drive wheel. The pumps
are direct driven through a coupling to 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 and if it drops
below 150 psi (1035 kPa), the CDM sounds a
tone and displays a flashing warning. Refer to
Section 5.17.4 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, shutdown 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.
57.9.6.2 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 and adjust 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. 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 200 to 250 psi (1379 to 1724 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.
(continued next page)
A
C
B
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