215676
429
Revision A
Checking Transmission Oil Pressure
The transmission oil pressure must be within the correct range for the drive wheels to function correctly.
IMPORTANT:
The 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:
1.
Check the hydraulic fluid level in the tank. For instructions, refer to
5.11.1 Checking and Filling Hydraulic Oil, page 419
2.
Check the hoses and lines for leakage.
3.
Check the charge pressure relief valve. For instructions, refer to
Checking Charge Pump Pressure, page 429
4.
If charge pressure still cannot be maintained, do
NOT
operate the windrower. Contact your MacDon Dealer.
Checking Charge Pump Pressure
The charge pump oil pressure must be within the correct range for the drive wheels to function correctly.
DANGER
To prevent bodily injury or death from the unexpected startup of the machine, always stop the engine and remove the
key from the ignition before leaving the operator
’
s seat for any reason.
The incorrect charge pressure setting may result in the charge pressure pump being unable to build the required system
pressure and/or inadequate loop flushing flows.
The correct charge pressure
MUST
be maintained under all conditions, in order to maintain pump control performance and
to operate the brake release.
Check the charge pump pressure as follows:
1.
Open the hood fully. For instructions, refer to
2.
Attach a 0
–
4000 kPa (0
–
600 psi) pressure gauge to a hose long enough to allow the pressure gauge to be read from
the operator
’
s seat.
1000796
A
Figure 5.198: Charge Pump Test Port
3.
Locate test port (A) on the charge filter head. Clean the test
port fitting, and then attach the hose to the fitting.
4.
Start the engine. Set the throttle to the idle position. The
pressure should be 1655
–
2241 kPa (240
–
325 psi) when the
hydraulic oil reaches a temperature of 40°C (100°F).
5.
Record the reading and shut down the engine.
6.
If the pressure reading is
NOT
within the appropriate range,
contact your MacDon Dealer.
7.
If the pressure reading is within the appropriate range,
remove the hose from the test port and close the hood. For
instructions, refer to
