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ENGINE DOES NOT START OR IS HARD TO START

Start by following normal procedure

Engine does not start

Test cylinder compression

Clogged fuel line and strainer

Clogged fuel valve

Not reaching carburetor

Wet plug

Weak or no spark

Engine starts but stops

Low compression

Check fuel flow to carburetor

Reaching carburetor

Remove and inspect spark plug

Good condition

Perform spark test

Good sparkClogged fuel tank breather tube

Flooded carburetor

Throttle valve open

Dirty air clearner

Improperly adjusted pilot screw

Starting enrichment (SE) valve stuck open or damaged

Faulty spark plug

Fouled spark plug

Loose or disconnected ignition system wires

Broken or shorted spark plug wire

Faulty ignition coil

Faulty ignition pulse generator

Faulty engine stop switch

Faulty ignition switch

Faulty ignition control module (ICM)

Improper choke operation

Incorrectly adjusted carburetor

Leaking carburetor insulator

Improper ignition timing (Faulty ICM or ignition pulse generator)

Contaminated fuel

Valve clearance too small

Valve stuck open

Worn cylinder and piston rings

Damaged cylinder head gasket

Seized valve

Improper valve timing

ENGINE LACKS POWER

Raise wheel off the ground and spin by hand

Wheel spins freely

Check tire pressure

Pressure normal

Check for slipping clutch

Engine speed reduced when clutch is released

Accelerate lightly

Engine speed increase

Check ignition timing

Correct

Test cylinder compression

Normal compression

Check carburetor for clogging

Not clogged

Remove and inspect spark plugs

Not fouled or discolored

Check oil level and condition

Correct

To following page

Wheel does not spin

freely

Pressure low

Abnormal

Engine speed does not increase

Incorrect

Low compression

Clogged

Fouled or discolored

Incorrect

Brake dragging

Worn or damaged axle or wheel bearing

Faulty tire valve

Punctured tire

Clutch slipping

Worn clutch discs/plates

Warped clutch discs/plates

Weak clutch spring

Additive in engine oil

Fuel/air mixture too rich or learn

Clogged air cleaner

Restricted fuel flow

Clogged muffler

Restricted fuel tank breather tube

Faulty ignition control module (ICM)

Faulty ignition pulse generator

Valve clearance too small

Valve stuck open

Worn cylinder and piston rings

Damaged cylinder head gasket

Seized valve

Improper valve timing

Carburetor not serviced frequently enough

Plug not serviced frequently enough

Incorrect spark plug used

Oil level too high

Oil level too low

Contaminated oil

POOR PERFORMANCE AT LOW AND IDLE SPEED

 

 

Loose carburetor insulator bands

Damaged carburetor insulator

Faulty carburetor insulator O-ring

Faulty spark plug

Fouled spark plug

Loose or disconnected ignition system wires

Broken or shorted spark plug wire

Faulty ignition coil

Faulty ignition pulse generator

Faulty engine stop switch

Faulty ignition switch

Faulty ignition control module (ICM)

Faulty ignition control module (ICM)

Faulty ignition pulse generator

Incorrect

Leaking

Weak or intermittent

spark

Incorrect

Valve train not lubricated properly

Engine knocks

Clogged oil passage

Clogged oil orifice

Worn piston and cylinder

Use of poor quality fuel

Excessive carbon build-up in

combustion chamber

Ignition timing too advance (Faulty ICM)

Lean fuel mixture

Check carburetor pilot screw adjustment

Correct

Check for leaking carburetor insulator

No leak

Perform spark test

Good spark

Check ignition timing

POOR HANDLING

 

Disconnect fuel tube at carburetor

Fuel flows freely

Check carburetor for clogging

Not clogged

Check valve timing

Correct

Check ignition timing

Correct

Check valve spring

Not weak

Fuel flow restricted

Clogged

Incorrect

Incorrect

Weak

Restricted fuel tube

Restricted fuel tank breather tube

Faulty fuel valve

Clogged fuel strainer

Carburetor not serviced frequently enough

Camshaft not installed properly

Faulty ignition control module (ICM)

Faulty ignition pulse generator

Faulty valve spring

Steering shaft nut or holder too tight

Damaged steering shaft bushing

Damaged steering shaft bearing

Excessive wheel bearing play

Bent rim

Improperly installed wheel hub

Excessively worn swingarm pivot bearings

Bent frame

Tire air pressure incorrect

Faulty shock absorber

Bent tie-rod

Incorrect tie-rod adjustment

Bent swingarm

Bent frame

Improper wheel alignment

 

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Cummins 4B3.9C ELITE, and 4BT3.9C ELITE, 4BG1T, Isuzu 4BG Series Industrial Diesel Engine, Mitsubishi L3E Series Industrial Diesel Engine, model: L3E-W231KBS, Yanmar 3TNV, 4TNV Series Industrial Diesel Engine, model: 3TNV82A, 3TNV84 (T), 3TNV88 (T), 4TNV84 (T), 4TNV88, 4TNV94L, 4TNV98, 4TNV98T, 4TNV106, 4TNV106T, New Holland F4GE9684E Series Industrial Diesel Engine, model: F4GE9684E, F4GE9684E-J6, Mitsubishi 6D34T, 6D34-T Series Industrial Diesel Engine, model: 6D34-TEB, 6D34-TLEB ,

New Holland produces both Agricultural farm equipment, and Heavy construction equipment like backhoe, skid steer loader, excavator, mini excavator, and wheel loader. Some examples of the tractor loader backhoe include 550, 555, 555A, 555B, 555C, 555D, 555E, 655, 655A, 655B, 655C, 655D, 655E, 675, 675A, 675B, 675C, 675D, 675E, 755, 755A, 755B, 755C, 755D, 755E, LB75, LB75.B, LB90, LB90.B, LB110, LB110.B, LB115, LB115.B just to name a few.

Some examples of the skid steer loader include L35, L170, L180, L185, L190, L225, L250, L255, L325, L425, L445, L451, L452, L454, L455, L465, L553, L554, L555, L565, L779, L781, L783, L784, L785, L865, LS120, LS125, LS140, LS150, LS160, LS170, LS180, LS190, LS465, LX485, LX565, LX665, LX865, LX885, LX985, just to name a few.