Riding Mower and Tractor Common Parts

Browse our common parts glossary for helpful definitions and explanations of riding mower and tractor parts at Sears PartsDirect. We have a list of common parts and their functions to better help you understand how your riding mower or lawn tracto works.

Air filter

The air filter prevents abrasive particles from entering the engine's cylinders, which could cause mechanical wear and oil contamination.

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Alternator

The alternator is a set of wire coils under the flywheel of the engine that generates electricity to power the tractor when it's running. The alternator also recharges the battery while the engine runs.

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Battery

On electric start engines, the battery provides the 12 volts needed to power the starter.

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Blade Clutch Cable

The blade clutch cable connects the blade clutch lever to the blade belt idler arm on the mower deck. When you shift the clutch lever to engage the cutting blades, the cable pulls the idler arm, which then tightens the blade belt and spins the cutting blades. The blade clutch cable releases blade belt tension so the blades don't spin when you shift the blade clutch lever to disengage the cutting blades.

Blade belt

Brake Interlock Switch

The brake interlock switch detects whether you have the brake pedal fully pushed down. The parking brake holds the brake pedal in the fully depressed position so the brake interlock switch also recognizes whether you have the parking brake set. The brake interlock switch won't allow you to start the tractor without the parking brake set or the brake pedal fully depressed.

Carburetor

Carburetor rebuild kit

The carburetor rebuild kit includes gaskets, seals, a hinge pin and other components to refurbish the carburetor.

Deck idler pulley

The deck idler pulley applies tension to the blade belt to spin the cutting blades.

Drive belt

A drive belt is a loop of flexible material that winds over the pulleys. It mechanically links 2 or more rotating shafts. Belts may be used as a source of motion or to transmit power efficiently. In a 2-pulley system, the belt either drives the pulleys in the same direction or is crossed to pull the shafts in opposite directions.

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Electric clutch

The electric clutch is mounted to the end of the engine crankshaft. When 12 volts of electricity are applied to the clutch, it energizes an electro-magnet to engage the mower drive pulley.

Flywheel key

The flywheel key is a small metal rectangle that keeps the crankshaft and flywheel aligned when you tighten the flywheel nut. To protect more expensive components from damage, the flywheel key is designed to shear if the mower blade hits an object hard enough to make the flywheel slip out of alignment with the crankshaft.

Front axle

The front axle connects the front wheels to the tractor frame.

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Front tire

The front tire attaches to the front axle and steers the riding mower in the desired direction.

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Fuel filter

A fuel filter is a filter in the fuel line that screens out dirt and rust particles from the fuel. The fuel filter paper is usually integrated into a cartridge. Fuel filters used with in most internal combustion engines.

Fuel pump

The fuel pump moves fuel from the fuel tank to the engine.

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Ground Drive Belt

Head gasket

The head gasket is a gasket that sits between the cylinder top and cylinder head in an internal combustion engine. The head gasket seals the head to the top of the cylinder to maximize compression.

Idler pulley

Idler pulleys can be flat or V shaped, and are used to either reroute or tension a belt on the mower.

Idler tension spring

The idler tension spring is used to pull the idler arm back to tighten the belt. The spring will usually connect to the idler arm on one end, and to the frame on the other.

Ignition coil

The ignition coil produces the energy to cause the spark at the spark plug.

Ignition switch

A riding mower ignition switch supplies power to the electrical components of the engine. When you turn the key, a metal contact transmits energy to the various connections on the switch. The ignition switch includes a lock that allows the switch to turn only when the tumblers in the lock are in the correct position.

Mandrel assembly

The mandrel assembly consists of the housing, bearings, and blade shaft. The mandrel mounts to the mower housing and has a pulley on top. When the user engages the blades, a belt turns the pulley on the top of the mandrel and spins the mower blade.

Motion Control Lever

The motion control lever shifts the transaxle from neutral to forward or reverse to move the tractor.

Mower blade

The mower blade is affixed to the end of a shaft and has one sharp edge on the top side. As the shaft spins, the sharp edge cuts the grass. Because of the upward angle of the sharp edge, the grass blows upward and out to the discharge chute.

Mower deck

The mower deck houses the cutting blades, blade belts and blade pulleys. The mower deck housing directs grass clippings through its outlet chute.

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Multi rib belt

A multi ribbed belt is a loop of flexible material which is looped over pulleys. It is used to mechanically link two or more rotating shafts. Belts may be used as a source of motion, or to transmit power efficiently. The multi rib design provides more surface area and does not slip as easy as a V-belt.

Neutral control

The neutral control adjusts the alignment of drive lever to keep the riding mower from creeping forward or backward with the lever in neutral. The neutral control is a component of the transmission on a zero-turn riding mower.

Oil

Engine oil is primarily used to lubricate various moving parts within internal combustion engines. However, engine oil also cleans, prevents corrosion, improves sealing, and cools the engine by carrying heat away from moving parts.

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Oil filter

An oil filter is a filter designed to remove contaminants from engine oil, transmission oil, lubricating oil or hydraulic oil.

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PTO lever

The PTO (power take-off) lever controls the cutting blades. Replace the PTO lever if it doesn't spin the blades when pushed forward.

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Rear tire

The rear tire attaches to the rear axle and propels the riding mower across the grass.

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Seat

The seat keeps your body stable as you drive the riding mower and engages the seat switch to keep the engine running while you’re sitting on the seat.

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Seat Switch

The seat switch recognizes whether you are sitting on the seat. If the seat switch doesn't detect you in the seat when you release the brake, the switch kills the engine. To prevent tampering, the seat switch also kills the engine when you release the brake if you unplug the seat switch wire harness.

Spark plug

A spark plug is the device responsible for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine. This current ignites the compressed fuel/air mixture by means of an electric spark, while containing combustion pressure within the engine.

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Starter Motor

The starter motor spins the flywheel to start the engine when you turn the key to the start position.

Starter Solenoid

The starter solenoid is a high-current switch that sends power to the starter motor to spin the engine when you turn the ignition key to the start position.

Steering drag link

The steering drag link connects between the steering sector gear and the spindle assembly. It pulls or pushes the spindle as you turn the steering wheel, causing the wheel to turn.

Steering kit

The steering kit is used to cure loose steering. It consists of the steering column, sector gear, pitman arm, mounting bracket and bushings. It comes completely assembled and ready to install.

Tie rod

The tie rod is located between the two front spindles. It is used to tie the two spindles together so the spindles will turn simultaneously.

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Transaxle assembly

The transaxle is a major mechanical component that combines the functionality of the transmission, the differential, and associated components of the driven axle into one integrated assembly. The belt from the engine drives the pulley on top of the transaxle, which propels the tractor.

Wheel spindle assembly

The wheel spindle attaches to the ends of the front axle. The spindle turns in the axle, allowing the front wheels to turn.