Gravely Pro-Master PM 320 HD Owner's/Operator's Manual page 16

NOTE: All gasoline is not the same. If the
engine experiences starting or performance
problems after using a new gasoline, switch
to a different fuel provider or fuel brand.
IMPORTANT: Excessively oxygenated or
reformulated fuels (fuels blended with
alcohols or ethers) can damage the fuel
system or cause performance problems. If
any undesirable operating problems occur,
use a gasoline with a lower percentage of
alcohol or ether.
Fuel Stabilizer
Gasoline left in the fuel system for extended
periods without a stabilizer will deteriorate,
resulting in gum deposits in the system.
These deposits can damage the carburetor
and the fuel hoses, filter and tank. Prevent
deposits from forming in the fuel system
during storage by adding a quality fuel
stabilizer to the fuel. Follow the
recommended mix ratio found on the fuel
stabilizer container.
TO STOP IN AN EMERGENCY
WARNING: Operating unit on
slopes may lead to loss of steering
control. When operating on slopes
be prepared to react to an
emergency situation.
1. Take foot off direction control pedal to
place unit in neutral.
2. Immediately set parking brake.
3. Turn off PTO and engine.
STARTING THE ENGINE
1. Check each item in Before Each Use in
the Maintenance Schedule.
2. Disengage PTO.
3. Engage parking brake.
4. Apply choke to a cold engine.
5. Place throttle lever to FAST when
starting a warm engine. Place throttle
lever in a middle position when starting a
cold engine.
6. Turn key to START position.
IMPORTANT: DO NOT operate starter motor
more than 15 seconds per minute, as
overheating and damage can occur. If engine
will not start, refer to Troubleshooting or
Engine Manual.
7. When engine starts, release to RUN
position.
8. Disengage parking brake.
OPERATING UNIT
To mow:
1. Take foot off direction control pedal to
place unit in neutral.
2. Place throttle lever in middle position.
3. Engage PTO.
4. Set throttle to FAST.
5. Depress direction control pedal for
desired mowing speed.
6. Disengage PTO when finished mowing.
STOPPING
1. Take foot off direction control pedal to
place unit in neutral.
2. Move throttle lever to SLOW.
3. Turn ignition key to OFF.
PARKING
1. Stop as instructed above.
2. Engage parking brake.
3. Remove ignition key.
MOVING UNIT MANUALLY
IMPORTANT: Never tow unit.
1. Stop engine.
2. Turn transmission bypass valve
counterclockwise 1/4 turn.
3. Disengage parking brake.
4. Push unit to desired location.
5. Engage parking brake.
6. Turn transmission bypass valve
clockwise 1/4 turn.
To allow manual
movement:
To engage
transmission:
GB - 16
OF3370
Figure 5