MacDon M105 Operator's Manual page 311

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 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:
1. Open hood fully. Refer to
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
filter head. Clean test port fitting and attach hose to
the fitting.
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.
169890
MAINTENANCE AND SERVICING
5.4.3 Opening Hood (Highest
Figure 5.189: Charge Pump Test Port
297
Revision A