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TROUBLESHOOTING
PROBLEM PROBABLE
CAUSE
CORRECTION
Engine will not
crank/start.
1. Safety interlock
system is not
engaged or is
faulty.
1. Check safety interlock system. See “Safety
Interlock System” on page 14.
2. Fuel tank is
empty.
2. Fill fuel tank. See “FILLING FUEL TANK”
on page 17.
3. Discharged
battery.
3. Charge battery. See “Charging the Battery”
on page 27.
4. Poor connection
between battery
and battery
cables.
4. Tighten battery cables and/or clean battery
and battery cables. See “Cleaning Battery
and Battery Cables” on page 27.
5. Spark plug wire(s)
loose or spark
plug(s) faulty.
5. Connect spark plug wire(s) or replace spark
plug(s). Refer to Engine Manual for detailed
instructions.
6. Faulty electrical
system.
6. Contact your Gravely dealer.
7. Faulty engine. 7. Contact your Gravely dealer.
Engine runs
rough.
1. Choke engaged. 1. Disengage choke.
2. Air filter cartridge
plugged.
2. Clean or replace air filter cartridge. Refer to
Engine Manual for detailed instructions.
3. Faulty engine. 3. Contact your Gravely dealer.
Unit does not
move with
engine running
when using
steering levers.
1. The transmission
bypass lever is
engaged.
1. Disengage transmission bypass lever. See
“MOVING UNIT MANUALLY” on page 19.
2. Faulty hydrostatic
belt.
2. Replace hydrostatic belt. See “REPLACING
HYDROSTATIC BELT” on page 30.
3. Faulty
transmission.
3. Contact your Gravely dealer.
PTO or mower
blades do not
engage or shut
off.
1. Operator
presence switch
not depressed.
1. Depress operator presence switch by sitting
on seat.
2. Faulty operator
presence switch.
2. Contact your Gravely dealer.
3. Faulty PTO belt. 3. Replace PTO belt. See “REPLACING PTO
BELT” on page 29.
4. Faulty PTO
switch, wires,
connectors, or
clutch.
4. Contact your Gravely dealer.
Engine
overheats.
1. Engine oil level
low.
1. Add engine oil. Refer to Engine Manual for
detailed instructions.
2. Cooling system
plugged.
2. Clean cooling system. Refer to Engine
Manual for detailed instructions.
3. Faulty engine. 3. Contact your Gravely dealer.