MacDon M105, Operator'S Manual

Page: 311 / 384

MAINTENANCE AND SERVICING
Checking Charge Pump Pressure
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.
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
5.4.3 Opening Hood (Highest
Position), page 203
.
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 200
to 250 psi (1379 to 1724 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
5.4.4 Closing Hood (Highest Position),
page 204
.
Figure 5.189: Charge Pump Test Port
169890
297
Revision A