## How does a variable speed pulley work on a mower?

The variable speed pulley is mounted on a sliding plate, which moves the pulley toward the engine or toward the transmission. As the pulley moves toward the engine, the transmission belt gets tighter. This forces the sliding plate in the variable pulley to squeeze the engine belt.

What does a variable speed pulley do?

The purpose of a variable speed pulley is to change the speed of a rotating shaft. The revolutions per minute (speed) can be either increased (sped up) or decreased (slowed).

### How does a variable speed self propelled lawn mower work?

Self-propelled mowers are available in single and variable speed models. They work by engaging a speed control lever (sometimes part of the handle; sometimes a separate bar or shifter) that causes the mower to move forward.

What causes mower deck belts to break?

Pulley Wear and Tear A pulley rides on bearings that allows it to spin freely. When a pulley doesn’t spin freely, friction is created between the pulley and belt, causing the belt to break.

#### Why does my belt keep slipping off my lawn mower?

A lawn mower belt keeps coming off the mower because the belt guides and brackets are out of adjustment; debris is collecting under your pulleys and tensioners; the brackets, bearings or bushings are damaged, or the mower belt is worn.

How do variable speed sheaves work?

The principle of a variable pitch sheave is that the threaded angular faced discs forming the V-shaped groove, in which the belt rides, are movable. When the discs are moved toward each other, the belt rides higher in the groove and the pitch diameter of the sheave is larger, which increases the driven speed.

## What is a variable speed clutch?

In this method, a variable speed drive is installed between the motor and the driven load. This drive may be an eddy current clutch or a fluid clutch (sometimes called a fluid coupling). Use of such a drive allows the motor to accelerate without accelerating the driven load.