What are the two most common methods for aligning sheaves?
There are several sheave alignment methods, the most common of which is the string and straightedge method, wherein these must touch each sheave at two diametrically opposite positions simultaneously (totaling four contact points). The sheaves should be rotated half a turn and checked again.
How do you align a pulley on an engine?
How to align the pulley?
- Remove the belt (see How to replace a belt).
- Loosen the driven pulley (shaft pulley), and adjust up and down to obtain level.
- Firmly re-tighten the pulley.
- Re-install and re-adjust the belt.
What causes pulley misalignment?
Parallel Misalignment While all of the pulleys may be running true, one or more of them could be sitting too far forward or back on its shaft. A common source of parallel misalignment is improper installation depth of press-fit pulleys, like those found on power steering pumps.
Which tool should be used to check for sheave parallel alignment?
The most common tools for measuring misalignment are a straightedge and string. The improper use of either tool, especially a string, can result in erroneous conclusions (Fig. 3). A straightedge should be used to project the orientation of one sheave or sprocket face with respect to the other.
How do you align a tensioner pulley?
The accessory belt needs to be loosened before the adjustment bolt can be turned on the side, top or bottom of the pulley. Turn the adjustment bolt clockwise to tighten the pulley.
Where is an adjustable sheave pulley located?
Since adjustable pulleys are more expensive than fixed pulleys and since motor pulleys are smaller than fan pulleys, adjustable pulleys are usually used on the motor shaft, not on the fan shaft.
What kind of tool is used for belt alignment?
Belt/Sheave Alignment Tool Belt alignment tools, or technically sheave alignment tools, are used to properly align the centerlines of sheave grooves (what the belt runs on) to the proper radial and axial alignment.
What are the components of a laser alignment tool?
Modern laser alignment tools have a big advantage over traditional alignment tools like a straight edge, optics and dial indicators. They consist of two sensors (a laser emitter and a receiver), brackets, rods, chains and a display unit. Let’s break down the different components of a laser alignment tool.
How do you use a laser to align a pulley?
Slip this laser into your pocket so it’s on hand to align belts, pulleys, chain, and sprockets. Economical and simple to use, just press the tool against the side of your pulley or sprocket and project the laser along your belt or chain to the aluminum target (included) to see any misalignment.
Where do you mount a laser alignment sensor?
Laser alignment sensors: The sensors should be mounted on the shaft, coupling hub, flywheel or brake disc. You’ll attach the stationary sensor (normally labeled “S”) to the stationary machine and the movable sensor (normally labeled “M”) to the movable machine. Brackets: The brackets mount the sensors to the machine.