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John Deere LT170 Tractor Troubleshooting

John Deere LT170 Engine Problems

Tractor engine won't start

Gas tank is empty - Add gasoline.
Improper fuel grade - Use quality gasoline.
Stale gasoline - Drain gasoline and fill fresh up.
Clogged fuel system - Remove clogging.
Spark plug defective - Inspect and replace if required.
Faulty spark plug - Check ignition spark.
Fuel filter is clogged - Replace fuel filter.
Defective safety switch - Replace if required.
Carburetor malfunction - Check and repair as required.
Check and adjust governor linkage. Check and adjust valve clearance.

Gas engine long starting

Spark plug malfunction - Test spark and replace as required.
Carburetor is dirty - Wash, clean and adjust.
Fuel pipes are clogged - Clean the system carefully.
Choke cable not adjusted properly - Checking and adjusting.
Stale or improper fuel - Drain and add proper gasoline.
Electrical wires are damaged - Inspect and change wires if required.
Starter fault - Test starter and repair if necessary.

Rough running engine

Cooling fins are clogged - Clean cooling fins.
Loose electrical connections - Check and replace damaged connections.
Ignition adjustment lost - Test ignition and spark plug.
Choke cable sticking - Check and change if required.
Air filter dirty - Change air cleaner.

JD LT170 Engine misses

Faulty spark plug - Change spark plug.
Carburetor defective or not adjusted - Repair or adjust.
Ignition coil air gap incorrect - Check and adjust ignition coil air gap.

Engine overheating

Engine overloaded - Reduce loads.
Air intake screen plugged - Clean clogged components.
Too little or too much oil - Inspect oil level.
Improper engine oil viscosity - Change oil.
Check connecting rod to crankshaft bearing clearance.
Too Fast idle - Adjust fast idle.

Engine does not idle

Poor spark plug contact - Check spark plug gap.
Spark plug malfunction - Check the spark and change defective spark.

John Deere LT170 Engine knocking

Stale fuel - Use proper gasoline.
Engine overloaded - Reduce loads.
Low oil level - add oil as required.
Low engine speed - Adjust the required speed.
Cylinder bore and rings are wear - Inspect and replace if required.
Check for engine overheating from plugged cooling fins.
Checking and adjusting valve clearance.
Check for carbon build-up in combustion chamber.

Engine back-fire

Checking spark plug.
Adjust or change the throttle.
Checking and adjusting carburetor.
Check and adjust ignition coil air gap.
Check inlet and outlet valves.
Check valve clearance, adjust if required.
Checking flywheel key.

Insufficient engine power

Engine temperature too high - Clean or replace air filter.
Too much oil in engine - Excess oil must be drained.
Fuel pump is damage - Test fuel pump output.
Faulty governor - Repair or replace governor.
Inspect carburetor for plugged passages.
Check engine compression.

Excessive Fuel Consumption

Throttle does not open well - Inspect choke cable.
Incorrect carburetor adjustment - Adjust carburetor.

Exhaust with black smoke

Air cleaner is dirty or oiled - Clean or change filter.
Choke not fully engaged - Inspecting and adjusting throttle.
Check for correct main jet for elevation.

JD LT170 Electrical Troubleshooting

Starter does not function

Blown fuse - Check and change.
Battery contacts are corroded - Inspect and clean terminals.
Battery discharged - Charge the battery.
Ignition lock defective - Change switch.
Starter fault - Install new starter.
Electrical wires are damaged - Replace wiring.

Battery does not charge

Faulty cell in battery - Fit new battery.
Battery cables and terminals are dirty - Replace or clean cable.

Lighting does not function

Light plug not connected.
Check lamps.
Short-circuit in cable.

John Deere LT170 Mechanical Troubleshooting

Excessive tractor vibration

Attachment drive belts worn or damaged - Inspect and change damaged belt.
Traction drive belt damage - Check and replace belt.
Drive sheaves are dirty - Clean or replace.
Blades bent or out of balance - Replace defective blades.

Tractor will not move with engine running

Parking brake holds the tractor - Unlock park brake.
Bypass valve pulled out - Deactivate the bypass valve.
Loose lawnmower blades - Check mower blades and fasten as required.
Improper blade balance - Check blades for damage and balance as required.
Too much or too little oil - Add oil to the transmission.

JD LT170 Mower Deck Problems

Discharge Chute Clogged

Operating at a faster ground speed - Choose recommended speed.
High grass - try operating a short cutting height.
Wet grass - Don't mow while wet grass.
Engine rpm too low - Open choke wide.
Lack of air flow - Check engine rpm.
Low cutting height - Change cutting height.
Incorrect belt installation - Install the belt correctly.

Lawn mower leaving uncut grass

Debris in cutting deck - Mower deck needs cleaning.
Blade wornout - Installing new blade.
Mower deck low - Deck leveling required.
Grass bag overfilled - Empty bagger.
Ground speed too fast - Do not use high speed.

Belt slips

Debris in sheaves - Check and clean.
Drive belt damage - Check and change damaged belt.
Belt tension is incorrect - Belt tension needs to be adjusted.

John Deere LT170 Mower vibrates

Mower clogged or in pulleys - Clean pulley and deck from debris.
Damaged sheaves or belt - Replace defective components.
Belt or sheaves no adjustment - Inspect and centering.
Blades out of balance - Adjust blade balance.

Blade strips grass

Incorrect height cutting - Set the proper cutting height.
Mower wheel height incorrect - Check wheel adjustment.
Tires inflated insufficient - Inflate tires as required.
Higher blade speed - Adjust the blade speed.
Bent mower blades - Remove bent blade and fit new one.

Uneven Cut

Mower deck low - Adjust and level the deck height.
Tires inflated insufficient - Inflate tires as required.
Wrong rollers position - Adjust front or back wheel height.
Gear too high - Operate the mower at low speed.
Blades worn - Sharpen or replace blade.

JOHN DEERE TRACTORS ATTACHMENTS
420	430	455	790	990
X300	X320	X330	X350	X475
X485	X500	X540	X570	X590
X700	X720	X738	X758	1023E
2025R	2210	2520	3025E	3032E
3038E	3038R	3039R	3046R	3203
3320	3520	4052R	4066R	4100
4105	4115	4200	4310	4320
4400	4410	4520	4600	4720

JD TRACTORS TROUBLESHOOTING
2640	3040	3310	3650	4100
5050D	5090R	5410	6105R	7200R
E130	L111	LA110	LT155	X300R