MacDon 9000 Operator's Manual page 98

MAINTENANCE/SERVICE
Header Drive: Hydraulics
HEADER DRIVE RELIEF PRESSURES
Auger
Header
To check relief pressure at flow control relief valve:
1. Disconnect hydraulic line at port
·s·
or port "A"
as marked on header drive flow control (B).
2. Attach a 3000 psi (20 MPa) pressure gauge to
a hose that is long enough to allow pressure
gauge to be read from the operator's seat.
Attach hose to port
·s·
or ·A" and position the
gauge near the seat.
3. Start engine and move throttle lever to half of
maximum engine speed. Move header clutch
lever forward to engaged position briefly.
IMPORTANT: Engage header clutch just long
enough to accurately read pressure.
4. Pressure should be 2000 psi (13.8 MPa}.
If pressure is not as specified, proceed with
adjustment:
5. Move header clutch lever rearward to dis-
engaged position. Shut off engine and remove
key.
6. To adjust relief setting:
• Remove cap nut at relief valve (C).
• Turn the adjustment screw in 1 / 8 turn
increments, clockwise to increase relief
pressure, counter-clockwise to decrease.
7. Repeat checking and adjustment procedure
until relief pressure is correct.
HEADER DRIVE FLOW CONTROL
96