Troy-Bilt 12090 Owner's Manual page 45

Appendix A: Troubleshooting
• Hardware holding tine holders to tine shaft
may be missing or broken. To check,
remove holders (Sect. 5).
• Key for bronze worm gear on tine attach-
ment main drive shaft may be missing or
broken.
5 Tines Turn, But Wheels Won't:
• Check operation of Wheel Speed Lever
(Problem 2).
• Hi-Pro key inside wheel clutch may be
missing, broken, if so, clutch will not turn
wheel shaft.
• FASTand SLOW speed wheel gears may
be worn. if only one gear is worn, there will
only be one wheel speed.
• Worm gear that drives pinion shaft and
pinion gears may be worn.
• FASTand SLOW speed pinion gears may
be worn. if only one gear is worn, there will
only be one wheel speed.
• Drive "dogs" on sides of wheel clutch may
be worn or broken, if only one side of clutch
is affected, there will only be one wheel
speed.
6 Wheels And Tines Turn On Top Of
Ground, But Stop Or Hesitate In Soil:
• Drive belt may be loose (Sect. 5).
• Mounting bolt for transmission drive pulley
may be loose (Figure 5-1).
7 Tiller Jumps While Tilling:
• Depth Regulator Lever set too deep for soil
conditions. Use a shallower setting.
• Engine throttle speed too fast.
• Tiller wheel speed too fast for soil condi-
tions. Change to LOW belt range or SLOW
wheel speed.
8 Depth Regulator Lever
Difficult To Move:
• Lubricate spring assembly and depth
adjustment bar (Sect. 5).
• Check for bent depth adjustment bar.
9 Wheel And Shaft Move
Out To One Side:
• Snap ring on wheel shaft may be
dislodged. Raisewheelsoffground and
check for back and forth play in shaft, if
there is play, one or both snap rings is loose.
10 Tiller Pulls To One Side:
• Check tire pressure (Sect. 5).
11 Tine Holder Bolt
Breaks Or Loosens:
• Earlier models have fine holder keys.
Check that keys are in keyways of tine shaft.
Without key in holder, left-side tine bolt will
tighten and break; right-side bolt will loosen
(Sect. 5).
12 PoorTraction:
• Bar tread tires, tire chains, or wheel
weights may be needed.
13 Gear Oil Leak From Power Unit Or Tine
Attachment Transmissions:
• See Section 5.
14 Engine Lacks Power:
• *Air cleaner restricted with dirt and/or oil.
• Spark plug wire loose or damaged. Spark
plug worn or fouled.
• Engine under excessive work load. Use
SLOW wheel speed and LOW belt range.
• *Throttle cable may be loose or misad-
justed.
• Verify that engine isn't running with choke
partially engaged.
• * Check Carburetor adjustment.
• *Engine overheating. Check oil level and
clean cooling fins. Oil may be very dirty. Let
hot engine cool before restarting.
• *Dirt or water in fuel or fuel system.
• Engine crankcase low in oil, or overfilled
with oil. Check and adjust level.
• * Low engine compression.
15 Engine Difficult To Start:
• Wheels/Tines/PTO Drive Lever not in
NEUTRALposition.
• Fuel tank low or empty.
• Dirt or water in fuel or fuel system.
• Fuelline is restricted.
• Choke control not set properly.
• Spark plug worn or fouled (weak spark).
• Air cleaner restricted with dirt and/or oil.
• Throttle cable adjustment.
Engine throttle lever not free to move
through its full operating range.
Throttle wire and its linkage are binding, or
are bent and not free to move.
Low engine compression.
16 Engine Won't Start:
See Troubleshootingthe Forward Interlock
Safety System in Section 5.
Wheels/Tines/PTO Drive Lever not in
NEUTRALposition.
Fuel tank low or empty. Or fuel line
restricted or clogged.
• Choke control improperly set.
• *Water or dirt in fuel, and/or fuel system.
• *Spark plug fouled or worn. Spark plug
wire loose or damaged.
• *Carburetor may need adjustment.
• *Air filter clogged with oil or dirt.
• Carburetor float faulty (or float valve
leaking)- if so, tap side of bowl lightly with
handle of screwdriver (or similar object).
• Stale fuel clogs carburetor, and valves.
Drain old fuel and add new fuel.
• *Fueltank shut-off valve (if soequipped)
not in fully Openposition.
• On Briggs & Strattonengine,On/Offswitch
not in ONposition.
ElectricStartEngines Only:
• Electrical c onnectionslooseor shortedto
metalframes,bracketsor covers(Sect.5).
• Batterydischarged(Sect.5).
• Electricstartermotor faulty.
17 EngineShutsOff WhenWheels/
Tines/PTO DriveLever Is In Forward:
• See Troubleshooting the ForwardInterlock
SafetySystemin Section5.
• Shortin key switch or key switch wire
harness.
• Check starter motor mounting bolts for
looseness. Have Authorized Engine Service
Dealer inspect the starter motor.
• Check oil level for correct amount.
18 Engine Overheats
• Cleantheenginecoolingfins, shroudand
covers(Sect.5).
• Checkfor brokenflywheelfins (under
engineshroud). SeeAuthorizedEngine
Dealer.
19 EngineRunsErratically:
• Water or dirt in gasolineor carburetor.
• Carburetormay needadjustment. See
EngineOwner'sManual.
• *Spark plug fouledor dirty. Sparkplug
wire looseor damaged.
• *Loose or crackedcarburetor.
• Governorlinkagenot adjustedproperlyor
binding. SeeAuthorizedEngineService
Dealer. Don't attemptto repairby yourself.
• Checkpan gasket,enginesealsand drain
plugsfor leaks. Seeyour AuthorizedEngine
ServiceDealer.
20 EngineRuns Well,
ButLabors UnderTillerLoad
• *Checkgovernorlinkagefor freedomof
movement.
• Checkthrottle settingand carburetor
adjustment. SeeEngineOwner'sManual.
• Tilling depthis possiblytoo deep. To
correct,lowerthe depth regulatorlever.
• Possibleworntiller worm gearor loose
driveshaft.
21 Key Switch Will Not
Start The Engine
• Check battery terminals for corrosion
(Sect. 5).
• Discharged battery(Sect.5).
• Defective solenoid.
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* SeeEngineOwner'sManual o r contactan authorized enginedealerfor information.