MacDon M155, Operator'S Manual

Page: 426 / 510

MAINTENANCE AND SERVICING
Checking Charge Pump Pressure
DANGER
To avoid bodily injury or death from 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.
Incorrect charge pressure settings may result in the inability to build required system pressure and/or inadequate
loop
fl ushing fl ows.
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:
1. Open hood fully. Refer to
5.2.3 Opening Hood (Highest Position), page 307
.
2. 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.
3. Locate the test port (A) which is located on the charge
fi lter head. Clean test port fi tting and attach hose to
the fi tting.
4. Start engine and leave at idle. Pressure should be
240–325 psi (1655–2241) kPa) with the hydraulic oil
at 100°F (40°C) minimum.
5. Note reading and shut down windrower.
6. If pressure is
NOT
within this range, contact your
MacDon Dealer.
7. Otherwise, remove hose from test port and close the
hood. Refer to
5.2.4 Closing Hood (Highest Position),
page 308
.
Figure 5.198: Charge Pump Test Port
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Revision A