How to Stretch a Lawn Mower Belt | Total 11 DIY Easy Steps (2022)

If you’ve been using the samelawnmowerfor a few seasons, it’s likely that thebelthas gotten a little loose. And while you could take it in for repairs, there’s an easy way to stretch it yourself at home.

We will be providing you with a series of instructions for you to learnhow to stretch a lawn mower beltsimply in a few simple steps. If you follow these steps and our tips, you’ll beable to prolong the life ofyourlawnmowersignificantly.

How to Identify If YourBeltNeeds to Be Stretched?

Any lawnmower engine can be boosted by belts, which are amazing accessories. But they also serve a practical purpose. Keeping your engine running smoothly is one of their functions.

That’s why it’s important to know whenyou should stretch it.Here are some signs that will help youdetermine whether your belt needs to be expanded:

1. The mower is leaving a patchy lawn

2. The mower is leaving uncut grass

3. The blade isn’t spinning

(Video) How To Adjust The Belt Tension On A Riding Lawn Mower

4. You can hear strange noises coming from the engine

5. The self-propel feature isn’t working

If you notice any of these signs, then it’s time to take a look at your lawnmower’s belt and see if it needs to be stretched.

The Tools You’ll Need for the Job

How to Stretch a Lawn Mower Belt | Total 11 DIY Easy Steps (1)

Although it’s possibleto bend the belt of a lawn mower by hand, doing so can be difficult and may damage it. A better way to do it is with a stretching tool. Here’s what you’ll need:

1. Abeltstretching tool

2. An adjustable wrench

3. A socket set

4. A drill

(Video) How to Measure Lawn Mower Belts

5. A block of wood (optional)

How to Stretch a Lawn Mower Beltwithout Damaging It?

When it comes tostretching your lawn mower belt, it’s important not to damage it. Otherwise, you’ll have to change itsooner than you’d like. Here are a few steps to help you stretch thebeltwithout ruining it:

1. Unscrew theLawnmowerDeck:

Before you can begin, you need to remove thelawnmowerdeck. To do this, first, disconnect the spark plug wire from the spark plug. Now loosen the screws holding the deck firmly in place. The deck should now be removed from the lawnmower once the bolts have been removed.

2. Remove theBeltfrom the Pulleys:

With thedeckremoved, you should be able to see thebeltthat goes around the pulleys.You will need an adjustable wrench to loosen the boltson the pulleys. Take it off the pulleys after the bolts are removed.

3. Stretch theBelt:

Now that thebeltis off the pulleys, you can start stretching it. In order to carry out this task, find thetightening tool that comes with yourstretching tool.

Once that has been accomplished, insert the tool into the hole at the end of thestrapand tighten it until it is snug. Then, use the handles on thebeltstretching tool to stretch it.

4. Reattach theBeltto the Pulleys:

Thebeltnow needs to be stretched to your desired length, and then it will need to be reattached to the pulleys. As soon as you feed thisthrough theidler pulley, you should notice a small kink in it.

Afterward, itwill be looped around the outer side of the drivepulley. Ensure that the bolts associated with the pulleys are tightened using an adjustable wrench.

5. Replace theLawnmowerDeck:

It is now time to replace thelawnmowerdeckafter you have reinstalled thebelt. You will have to lift thedeckinto place and then tighten the nuts that hold it in place with an adjustable wrench. When finished connecting the wire to the spark plug, you are done.

(Video) How to replace the deck belt on your Zero Turn or Riding Mower

There you have it. These are the steps that you need to follow in order to stretch alawnmower beltwithout breaking it.

Tips for Stretching aLawn Mower BeltSo That It Lasts Longer

How to Stretch a Lawn Mower Belt | Total 11 DIY Easy Steps (2)

Any lawn mower is incomplete without a belt, which helps spin the blades and cut the grass. However, if itis stretched too much, it can break easily, which can be both inconvenient and costly. Here are some guidelines that will hopefully help you.

1. Always Use aBeltStretching Tool:

Constantly use a belt stretching tool when adjusting it. This will help to prevent the belt from being overstretched and breaking. The most common cause of a broken is an improperly adjusted tension pulley. When the tension pulley is not properly adjusted, it puts too much tension on the belt, causing it to snap.

2. Do Not Over-Stretch:

The second tip to stretching a lawn mower belt is to not over-stretch it. This can weaken the structure and cause it to break. The best way to stretch it is to slowly increase the tension on the belt until it is tight.

Then, hold the tension on the belt for a few seconds before releasing it. Repeat this process several times until it is stretched to the desired length. Slowly stretching it and not overstretching it, you will prolong the life of it and help prevent it from breaking.

3. Check theBeltRegularly:

One of the best ways to avoid having to replace mower belts is to check it regularly for wear and tear. A visual inspection can often reveal cracks or fraying that could lead to the belt breaking. If you notice any damage, it’s best to replace it before it has a chance to fail.

4. Store it in a Cool, Dry Place:

You should never store a lawn mower belt in a hot, humid place. The heat and moisture will cause it to deteriorate, making it more likely to break when you need it most. Instead, keep it in a cool, dry place where it will be protected from the elements. If possible, store it in a sealed plastic bag to further reduce the risk of damage.

5. Replace theBeltif it is Damaged:

Most lawn mower belts are made of Kevlar or a similar material that is very strong and durable. However, over time, it can become stretched or damaged, making it less effective at transferring power from the engine to the blade.

(Video) Replacing Drive Belt on Zero Turn Mower! DIY.

If your lawn mower belt is starting to show signs of wear, it’s important to take action before it fails completely.

6. Follow the Manufacturer’s Instructions:

When stretching alawn mower belt, always follow the manufacturer’s instructions.The belt will be stretchedcorrectlyand the damage won’t occur if youdo this. Manufacturers’ instructions are important and you should never ignore them.

With the following tips, you willextend the lifespan of yourlawn mower beltand prevent any damage to your machine.


Let’s now take a look at some frequently asked questions aboutlawn mower belt stretching.It should help clear up any confusion you may have.

Q: Can I Use WD-40 to Lubricate MyBelt?

A: WD-40 will not fix rubber squeaks. Spraying an oil-based lubricant onto adrive beltmay temporarily fix the problem, but it will not solve the problem permanently. WD-40 should ideally be avoided when working with rubber since it will result in a bad outcome.

Q: How Tight Should MyLawn Mower BeltBe?

A: It is generally a good rule of thumb to tighten thebeltto the point that it cannot be turned more than a quarter turn.In the case of a loose belt,it will slip, and if itis too tight, you will wear out the bearings on themower deck.

Q: How Long Should aMowerDrive BeltLast?

A: The typical life expectancy of thedrive beltis between three and four years when used under ideal conditions. Taking good care of yourmoweris essential, especially if you use it quite a bit or if you do not use it very often.

Q: How Many Belts Are on aRiding Lawn Mower?

A: The majority of riding lawnmowers come with two belts. Onebeltconnects the transmissionwith the drive shaft ofthelawn tractor, while the otherbeltconnects themower deckto the drive shaftpulley.


It is important that you follow the tips above to ensure that you don’t damage thelawn mower beltafter learninghow to stretch a lawn mower belt. Additionally, it is necessary to check thebeltfor any signs of wear and tear on a regular basis.

(Video) Fix Mower Belt (that fell off) Easy Steps!

With proper care, yourlawn mower beltshould last for many years. Hopefully, you enjoyed reading this article and found it helpful. It is my pleasure to have you read this. I appreciate your time.


Can you stretch a lawn mower belt? ›

Yes! Over time a lawn mower belt can stretch, although breakage is more common.

How do I adjust the tension on my lawn mower belt? ›

Now you take your ten millimeter wrench you loosen those bolts off. And you pull that bracket away

How do you adjust the tension on a Craftsman riding mower deck belt? ›

But this is the bracket on the right hand side of your lawnmower. That's your just the tension of

How do you fix a lawn mower belt? ›

Release the belt from the idler pulleys belt keepers and mandrel pulleys. Pull the belt off the

How do you stretch a belt? ›

Water Fill a basin with warm water, submerge the leather straps in the water, and gently twist or knead the straps to help them absorb the water. Leave them in the water for up to ten minutes; then, gently stretch the leather straps to the desired length.

What happens if deck belt is too tight? ›

If a belt is too tight in a system, it can add stress to your bearings. The added stress to bearings can result into over amperage of your motor and potential motor failure.

How tight should the belt be on a mower deck? ›

Apply pressure to the belt between pulley A and pulley B, and deflect the belt ½ inch. The gauge should read 10-15 ft-lb. If the reading on the gauge is higher, it is too tight, and if it is lower, it is too loose.

How tight should a riding mower belt be? ›

Home and Garden Geek adds that you should be able to loop one or two fingers over the same belt when the tractor is off and the belt is “engaged” and pull it gently away from the pullies. This translates to one or two pounds of force. If you need more than two fingers, your deck belt may be too tight.

Where does the tension spring go on a mower deck? ›

How to replace the Belt Tensioner Spring on a John Deere ... - YouTube

How do you tighten the belt on a Craftsman self propelled lawn mower? ›

To tighten the drive belt on a self- propelled lawn mower, to keep working, you must use the blade lever to apply pressure on the belt, which will tighten up the sash.

How do you adjust the belt on a MTD riding lawn mower? ›

How to Adjust an MTD Riding Mower Belt - YouTube

How do you adjust a mower deck? ›

Leveling a Riding Lawn Mower Deck for an Even Cut - YouTube

How do you stop a lawn mower belt from slipping? ›

Lawn mower slipping belt hack - YouTube

What are the two belts on a riding lawn mower? ›

There are two belts on most riding lawnmowers. One belt connects the transmission of the lawn tractor to the driveshaft pulley and the other belt connects the mower deck to the driveshaft pulley.

How do you adjust the drive belt on a Craftsman lawn mower? ›

How to tighten the drive belt on a craftsman lawnmower, step by...
  1. Step 1: Gather the necessary tools and remove the spark plug.
  2. Position your lawnmower on a leveled surface.
  3. Step 3: Remove the mower deck.
  4. Step 4: Tighten the belt bracket.
  5. Step 5: Tighten all pulley connections.
  6. Step 6: Double-check the blades.

Can a belt stretch? ›

Leather belts do stretch. All leather products stretch with prolonged use, but the type of belt and how it was made can determine two things: How much the leather belt stretches.

How do you use a belt stretch tool? ›

Lisle 59370 Stretch Belt Remover/Installer - Lisle Corporation

How do you soften and stretch leather? ›

How To Stretch Leather Shoes At Home | Easy DIY Tutorial In 4 ...

How do I know if my mower belt is too loose? ›

Contents show
  1. 2.1 Belt is Slipping.
  2. 2.2 Excessive Deck Vibration.
  3. 2.3 High Pitch Noise.
  4. 2.4 Faster Wearing on Sides.
  5. 2.5 Comes Off the Pulleys.

What happens if the belt is crossed? ›

Due to crossing between two pulleys, the belt rubs against itself and thus undergoes gradual wear. Thus belt has a shorter life. In between two pulleys, the belt vibrates (whips) when the center distance is more.

What causes a mower deck to vibrate? ›

Deck vibration can be caused by an unbalanced blade, worn pulley or mandrel, bad blade belt or debris caught inside a pulley. Loose nuts or bolts on the pulleys, mandrels or blades can also cause vibration. Remove the mower deck and re-tighten all fasteners.

Can V belts stretch? ›

Industry experts generally agree that a well-designed, properly aligned and tensioned V-belt drive is most efficient — about 97% — when first installed (see box on efficiency). With time and use, the belts stretch, lose tension, and begin to slip in their sheaves.

How long do riding mower belts last? ›

Under ideal conditions, a mower drive belt will last between three to four years. If you use the mower quite a bit or if you do not take good care of the machine, it may wear out sooner. Wear and tear often makes it hard to keep the mower belt going for longer than four years.

How do you adjust the belt on a MTD riding lawn mower? ›

How to Adjust an MTD Riding Mower Belt - YouTube

Why does the deck belt keeps coming off? ›

There are lots of potential reasons for a mower deck belt that keeps coming off. It might be that the belt is damaged or worn, the belt could have stretched, one or more belt keepers could be bent out of place or there could be a damaged pulley or pulley bracket.

Can you reuse a stretch belt? ›

Dismounting and reusing stretch belts is not recommended. A new belt should be installed anytime one is removed.

What size mower belt do I need? ›

Each model uses a different size belt. To give examples, some models use a drive belt that is ½ inch wide by 92 inches in length, while others use a belt ½ inch wide by 85 inches in length. If a manufacture has several 42-inch-cut riding mower models, each model may require a different size belt.

What is a stretch fit belt? ›

Stretch-fit serpentine belts are the latest product in the evolution of the accessory drive belt. Similar in external appearance to a conventional serpentine belt, these belts have a unique internal construction that allows them to be self-tensioning.

How loose should a mower belt be? ›

Home and Garden Geek adds that you should be able to loop one or two fingers over the same belt when the tractor is off and the belt is “engaged” and pull it gently away from the pullies. This translates to one or two pounds of force. If you need more than two fingers, your deck belt may be too tight.

Why does my riding lawn mower keep breaking belts? ›

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.

How do I know if my mower belt is loose? ›

When the belt has the right tension and is securely in place, everything runs smoothly and efficiently. There's no noise, no loss of blade speed and no vibration. But when the deck belt becomes loose, things start to become more irregular, and this can cause vibration in the deck.

How do I stop my lawn mower belt from slipping? ›

Lawn mower slipping belt hack - YouTube

How do you put a belt on a Craftsman riding lawn mower? ›

How to Replace the Belt on a Craftsman Riding Mower - YouTube

What size is the drive belt for MTD Yard Machine? ›

MTD Drive Belt No.

Size: 3/8" x 36". Replaces # 954-0465 & 754-0465.

Having a lawnmower is one thing but keeping it in great working condition is something different. From ensuring it cuts grass neatly, learning how to sharpen blades, fixing broken belts, …

Do Lawn Mower Belts Stretch?. Yes, lawnmower belts can stretch.. For example, do lawnmower belts stretch, and what causes it?. When belts stretch, they lose contact with the pulley system, making it difficult to move the mower forward or backward.. So, a question every handyman should try to answer is how does. one know when belts drive loose?. Remember, belts should have a first grip of the pulley system for mowers to function efficiently and move around without any difficulty.. Most importantly, check the pulley system. to make sure there is no debris of a broken belt.. When replacing belts, you should ensure it. is the best for the drive.

Replacing belts on your mower is like replacing tires on your car, there are only so many miles in them. Replacing a deck belt can be a challenge, especially if the mower throws the belt and you don’t know the routing, but we’ll get it figured out!

The last pulley to fit is the crank pulley (engine pulley).. A mower toothed or timed belt does two jobs, it transfers power and at the same time keeps the mower blades from hitting each other.. It’s fitted to mower decks with overlapping blades.. A pulley’s job is to route the belt around the chassis of the mower or mowing deck and transfer power from the engine pulley to the driven pulleys.. As a rough guide, pulleys usually wear out at the same time as a belt, so best to check them while you have the belt removed.. A tensioner pulley can be a flat or V pulley.. A stationary pulley is usually known as an idler, and its job is to route the belt around the chassis of the mower, or mower deck, they can be flat or V type.. V Pulley – This is a V pulley, the driving side of the belt is making contact with the pulley.. The belt can be fitted to both of these types of setups without removing the deck from the mower.. With the belt off the engine pulley, it’s easy to guide it off the other pulleys.. In this guide I will: remove the deck; inspect belts; replace the belt; tension the belt; set the timing of the blades.. Remove – Remove the two guide bolts.

Murray lawnmowers are reliable and suitable for small to medium-sized yards. Regular maintenance is vital to keep Murray lawnmowers running reliably. Maintenance can include installing a new blade belt if …

Replacing a Murray mower belt will help make the lawnmower work reliable again and enhance the mower’s life.. If the belt is worn, the lawnmower will move sluggishly as the belt slips on the pulley.. How to put the belt on a Murray riding lawnmower, step by step:. Slide the mower housing out and put on the new belt Step 8.. Replace multiple belts: It can be a good idea to change both riding lawn mower belts simultaneously as there is always an interplay between the drive belts in the changing speed pulley system.. When the mower deck belt is removed from the mower, the “drive belt” would be the only one still on the mower whose function is to drive the blades.. This blog post will show you how to replace a mower deck belt on your Murray lawnmower.

A worn or broken pump belt can CAUSE your Bad Boy mower to stop working properly. Learn how to change the pump belt on a Bad Boy mower with this easy guide...

It’s remarkably beneficial to know how to change the pump belt on a bad boy mower so that your mower continues to operate efficiently.. Taking the mower off the deck to change the pump belt on the bad boy mower is a critical step in ensuring that the mower operates safely and efficiently.. If the mower is left on the deck while changing the pump belt, then there is a risk of damaging the deck with the tools and equipment used to change the pump belt.. For these reasons, removing the mower from the deck is critical before changing the pump belt on the bad boy mower.. The pump belt is located under the belt cover, so you’ll need to remove the cover before you can access the belt.. You should cut some grass after replacing the bad boy mower’s pump belt.. Overall, changing the pump belt on a bad boy mower is an ideal solution for those who need a durable and robust lawn mower.. By simply cleaning any debris off the belt and keeping it well-lubricated, you can help to ensure that your mower’s pump belt stays in good condition.. Replacing the belt when it shows signs of tear is a good way to keep your mower’s pump belt in good working order.. When tensioning your mower deck belt, the general rule of thumb is that you should be able to loop one or two fingers over the same belt when the tractor is off, and the belt is “engaged,” and pull it gently away from the pullies.. A loose belt can slip and cause damage to your mower deck, so it’s crucial to find the sweet spot when tensioning your belt.. If you know how to change a pump belt on a bad boy mower and have the right tools, it is not complicated.

V-belts look like relatively benign and simple pieces of equipment. They're basically a glorified rubber band, right? Need a replacement? Just measure the top width and circumference, find another belt with the same dimensions, and slap it on the drive. There's only one problem: that approach is about as wrong as you can get.

In this article we'll review some V-belt basics to help you make better sense of which belt to use in a given application to make your belt drives last longer, run more efficiently, and save you downtime and money.. How V-Belts Work Unlike flat belts, which rely solely on friction and can track and slip off pulleys, V-belts have sidewalls that fit into corresponding sheave grooves, providing additional surface area and greater stability.. V-belts with a narrow profile (3V, 5V, 8V) have more steeply angled sidewalls than classical V-belts (Figure 4), providing increased wedging action and higher load capacity (up to 3x that of comparable classical V-belts)... In a well-engineered V-belt, the tensile cords and rubber body of the belt are chemically bonded to form one unit, allowing for equal load distribution and longer belt life.. As described earlier, the notches in a notched V-belt are designed to increase belt flexibility and reduce bending stresses, especially on small sheaves.. As another example, replacing an older, classical V-belt drive with a newer, narrow profile notched V-belt made with an ethylene elastomer and aramid fiber tensile cords can yield up to 3x greater load carrying capacity while reducing the weight and size of the drive, relieving stress on shafts, bearings and other components.. If the sheaves are not worn, you can use fewer, higher-performance belts (leaving open grooves), or fill all the grooves with higher-performance belts to increase drive load capacity and extend belt life.

A V-belt’s purpose is to transmit energy between two components. What makes a V-belt pulley stand out from other types of pulleys, such as a round belt or

What makes a V-belt pulley stand out from other types of pulleys, such as a round belt or flat pulley, are the V-shaped grooves of the pulley; these grooves guide the belt and allow it to gain traction.. The proper tension is the lowest tension at which the belt won’t slip or squeal under peak load.. Apply a sufficient force to deflect the belt until the large O-ring is in-line with the other belts.. If the force is below the recommended value, increase the drive center distance to provide greater belt tension.. Aim the sensor as close to the center of a selected belt span as possible in order to get the most accurate tension reading.. Using too short of a span could yield false tension readings that may be much higher than the actual belt tension, due to effects of belt stiffness.. Here are some procedures and “best” practices that may ease use or help increase the reliability of your belt tensioning efforts: On new installations, hand rotate the system at least one full revolution of the belt in order to seat and normalize the components.. Banded belts are to be treated as a single unit with the belt mass constant calculated as a multiple of the single belt value.. The meter will not give a measurement reading for a belt under extremely low tension.. We mention the “thumb test” method (using your hand or thumb to apply pressure to the belt as a way to judge whether or not it has the correct amount of tension) because many traditional businesses still practice this style of V-belt tensioning.. While the “pros” of this method include the initial money and time savings gained from this simple procedure, as opposed to investing in a tensioning tool, the cost build-up of having to replace your belts frequently will ultimately overshadow this, consequently increasing downtime from belt failure.. Designed for the tension testing of a drive with two or more belts, this pocket-sized tool measures V-belts from 10” to 170” and up to 35 pounds of tension.. Measure belt span and measure the force required to deflect any one of the belts 1/64” for every inch of span length.The TensionRite® Meter, from the trusted brand of Continental ContiTech, provides a simple, repeatable and reliable method for tensioning belts using optical technology.


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