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How do i install the belt ?

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There is no specific time length that mower belts need to be replaced. Some belts may last longer than others due to different operating conditions. One thing is for certain though, the more the mower is used, the sooner you will need to consider replacing the mower belt.
Figure 58.4 is an illustration of how a V-belt should sit in the pulley groove. The top of the belt should be within 1 16 -inch of the outer surface of the pulley. If the belt top is deeper in the groove, the groove or belt is worn, which can shorten the remaining belt life by as much as 50 per cent.
For most effective results, a lawn mower deck should have a pitch, or height difference of 1/8-inch to 1/2-inch between the front of the deck to the back of the deck. Naturally, this makes the sweet spot about 1/4-inch of pitch, depending on the mower model.
We can repair broken lawn mower belts faster than if you took your mower into a regular repair shop! There are many things you can do to ensure that your lawn mower is running properly. Replacing belts on your lawn mower will keep your lawn mower drive system operating at optimal speed.
MaxPower, Sunbelt and CRAFTSMAN® are among the most popular Lawn Mower Belt brands. While those brands are the most popular overall, you will also find a great assortment from Briggs & Stratton, Ariens and Honda.
Lawnmowers are usually driven by V belts. These are belts with a wedge shape that are used more widely for transmitting power between v pulleys and are ideal for lawnmowers. Some lawnmowers use a standard V belt with a simple construction consisting of three materials.
Are Belt Drive Bikes Faster Than Chain Drive? No. Belt drive bikes are actually slower than chain driven bikes when the same amount of power is used by the rider, as chain driven bikes actually provide less friction which can slow you down.
Bring both sides of the belt to the back, keeping the tail end longer. Crisscross the ends with buckle side underneath the tail end. Tie a single overhand knot, bringing the tail end upwards as you cinch the belt. Drop the tail end to let it hang downwards.
Deeper decks generally mean larger capacity, better cut quality and more power required. High lift blades mean better cut quality, higher noise levels and more power required. Heavy gauge decks last longer before they wear through. Good reinforcements provide protection against impacts with turf and other objects.
Mower deck gauge wheels should be properly adjusted to prevent scalping grass on uneven terrain. The bottom of the wheels should sit approximately 1/8-1/2 of an inch from the ground, depending on your cutting height.
You should be able to take a deep belly breath and then forcefully press your core against the belt without raising your shoulders. If there is slack when fully inhaled, the belt is too loose. Below, I`ll cover the main rules to follow when picking your belt tightness and some individual factors you should consider.
For most vehicles, the belt should not be able to be pressed down more than ½ inch. If it can be pressed lower, then the belt is too loose.
The spindles and caster wheels are generally the most often greased. If you are a light use homeowner, then greasing the mower at the beginning and middle of the season is generally enough. The spindles and castor wheels should be done around once a month because of the moving interior parts.
A common cause of belt breakage is excessive grass clippings on the deck. Grass clippings can work their way under pulleys and deck covers, causing series problems. Make sure to clean off your deck after every mower use and follow manufacturer recommendations.
The deck belt on your riding lawn mower connects the crank shaft to the lawn mower blades, causing them to turn. If you notice cracks forming in the rubber, consider changing your deck belt. To avoid interruption while mowing, change the deck belt before it breaks.
Serpentine belt replacement is easy because today`s automatic drive belt tensioners eliminate the need to loosen bolts or pry components into position for retensioning. Just rotate the tensioner, remove the old belt and install a new one.
When pulleys are not aligned properly, additional loads are induced. The aim of belt alignment is to align the grooves of the drive and driven pulleys so that the belts run with minimal wear. Proper alignment extends the service life of belts and bearings, reduces vibration and noise levels, and saves energy.
A v-belt is flexible and transmits power from one shaft to another. As seen in Figure 2, a v-belt has a trapezoidal cross-section. The wedge-shaped belt fits perfectly into the wedged groove of a pulley. Due to this good fit, v-belts transmit more force than flat belts.
Always Mow at 3 Inches or Taller

Often the highest setting on most mower types is 3 inches. Mowing the grass at 3 inches or taller will prevent diseases, promote deep digging roots, help the grass conserve water, improve turf density, and improve turf color.

For a typical residential Midwest lawn, maintain a height of 3 inches or higher. Taller grass shades out weed seeds and keeps soil cooler. Taller grass means longer roots and greater ability to withstand drought and reach nutrients.
The belt has a glazed or bu​rned sidewall.

Look at the belt edge that contacts the pulleys. If it appears shiny, glazed or burned, it will need to be replaced.

Common Problems. The most common problem with deck belts is excessive grass clipping on the deck. Grass clipping can work there way under pulleys and deck covers which can lead to more serious problems. Make sure to clean off your deck after every use following the manufacturers recommendations.

Discover Relevant Questions and Answers for Your Specific Issue

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ROUTING OF BELT – Mtd Drive Belt 42"
ANSWER : Diagram is on the mowing deckBest regardsCk

Drive belt Have replace drive belt but mower still has no forward movement. Mower is only 2 years old but its already had to have another drive belt installed by the dealer last year. wanted to do it myself but when i install belt theres hardly any tension so mower doesnt move. Checked and rechecked the diagram and is installed correctly. Cant find a tensioner adjustment if it has one.
ANSWER : I don’t have an answer for you, but Do you have a diagram of the Drive Belt?

What size for a 611 deutz allis 42 in deck – Mtd Drive Belt 42"
ANSWER : Go to they may have the answer for you !

Diagram to install mower deck belt – Troy Bilt 175HP Manual 42" Riding Mower
ANSWER : Need a diagram of how to replace the deck belt.

Need the mower deck belt size for a allis chalmers t-811 lawn mower
ANSWER : 42″ deck 1/2 x 120 P/N 1668066SM
48″ deck 1/2 x 126 P/N 1703466SM

Need diagram of deck belt installation – Craftsman 17.5 hp 42 in. Deck Lawn Tractor – CA Model
ANSWER : May I get the make and model # to get you the right belt diagram

I have a model LTH130 42 inch cut mower and just installed a new elect. clutch and started mowing grass and it began to feel like it was bogging down and I stopped the engine and the belt was very hot. What is going on now?
ANSWER : Hi and welcome to FixYa, I am Kelly

See this link and locate your deck:

Make sure you have the belt routed correctly. ALSO make sure that you do not have it flipped 180 deg over the idler.

I recommend that you unhook the belt from the mower deck pulleys and try rotating the blades. A bad blade bearing can cause a belt to heat up. Of any of the blades are hard to turn by hand that blade bearing will need to be replaced. Check the idler pulley also.

If after checking the above you continue to experience a problem just respond here and I will help you.

Thanks for choosing FixYa,

I am trying to replace a belt on the deck mower
ANSWER : If it’s a craftsman. Go to and put in your exact model number (which you didn’t list) then when you get to the parts listing, look on the right hand side of the page and see if there is a link to manuals for your model , if so click on that. The manual should show you pictures of your belt.