Troubleshooting - Gravely 915170 ZT 42 CARB Owner's/Operator's Manual

PROBLEM
Engine will not
crank/start.
Engine runs
rough.
Unit does not
move with
engine running
when using
steering levers.
PTO or mower
blades do not
engage or shut
off.
Engine
overheats.

TROUBLESHOOTING

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