How To Tighten Belt Tensioner Pulley

How to Adjust an MTD Riding Mower Belt. Measure belt span "T". In making that adjustment, you inadvertently create an adverse condition: When the driven load is less than maximum, belt tension is greater than necessary. From the ridge of the pulley to the motor mount surface, this distance should be. So I did some searching and i'm pretty sure my squeaking that comes when the A/C is on is either my A/C Belt Tension isn't correct or my A/C system is overcharged and needs to be purged, but i'm pretty sure its the belt. Loosen and tighten the adjusting nut to tighten the tensioner belt. The mower has a tensioner adjustment mechanism to ensure the belt remains tight on the drive wheel and pulley assembly. There should be resistance to this movement. Adjusting Tensioner Pulley Step 1. Then remove the alternator belt from the pulley and alternator. A tensioner maintains the correct amount of tension on the belt at all times throughout its duty cycle. Tighten the tensioner down with a hex key or preferably one on a socket. What this all boils down to is that the belt tension will tighten up when the three points are in a straight line, which is when you sit on the bike and as the suspension swings up and down the arch. You even need to check the tension in the belt while tightening it. Now you need to tighten the slider bolt and the tensioner lock bolt. N a = speed of pulley a. The cause was the frayed and cracked edges of the alternator belt as it passed over the alternator pulley. I knew from. You may have a bad bearing in the accessory belt tensioner, or the belt is worn out & stretched. Check for cracks or other faults in the belt. The idler pulley (A) guides the belt below the motor mount. Self-propelled Honda lawn mowers use a belt and pulley to help drive the mower, making it easier to mow the lawn. A drive belt tensioner is a pulley mounted on a spring mechanism or adjustable pivot point that is used to keep tension on the engine belts. Our technicians tell us that in order to get a new pulley from General Motors you must purchase a complete belt tensioner assembly. Relax the tensioner by turning the center nut counter-clockwise. In some vehicles, the drive belt also serves as a timing belt, keeping. This would be a good time to change them if needed. Check the belt tension by looking at the tensioner arm—the mark cast into the tensioner body will fall between the high and low marks if the belt is the correct part number and is installed. The first time I had it done at the dealer which cost me $480 with parts and labor. If a tension gauge is not available, tension can be checked with moderate thumb pressure applied to the belt at its longest span midway between pulleys. Pull the friction wheel tab and slip belt over crank pulley. It's most likely your belt tension. Once the belt is on all but the last pulley, use your 1/2” drive ratchet or belt remover tool to loosen the tension on the pulley. The serpentine belt tensioner pulley may wear out. If there is none, the spring has lost its force. This is good for flat ground. μ = coefficient of friction between belt and pulley. Or should I just buy a new tensioner with a hope that I dont need to adjust tension since it should have some standard tension. Tensioner. DRIVE BELT ADJUSTMENT Generator Drive Belt. With a few tools, you can. N a = speed of pulley a. The belt will help power various components such as the power steering, water pump, A/C, alternator and compressor. Locate the four bolts that hold the pulley in place and attach it to the alternator. Turn the transmission to release the tension. Now you need to tighten the slider bolt and the tensioner lock bolt. This will tighten the belt a bit more too. Our technicians tell us that in order to get a new pulley from General Motors you must purchase a complete belt tensioner assembly. Adding shims decreases belt tension, and subtracting shims increases belt tension. Remove the bolt holding the tensioner into place. Two cylinders designed to fix the tension pulley. I just bought a Ryobi drill press (254mm 10", model RDP102L). My center bolt and that will give you more slack on the belt. 375), the X-axis belt on your machine may not function properly and the risk of tearing or snapping a belt is greatly increased. A bolt holds the left pulley in place and it can slide back and forth to adjust the belt tension. The first pulley I replaced was the serpentine belt tensioner pulley located just below the alternator. 0 billet belt tensioner pulley has you covered on both accounts. I will post some more on how the job went and some pictures when I have some time to do so. After that retighten the pulley bolts. The belt is routed around a spring tensioner idler pulley which keeps a constant and proper tension on the belt. Contact an authorized serving dealer for evaluation and repair. Cars equipped with an automatic belt tensioner adjust themselves over time and do not require adjustment. Once it's on just let go of the wrench slowly and the tensioner will move forward and retighten itself. Put the wrench/tool on the center bolt on the tensioner pulley, and turn it clockwise. After the pulleys have been aligned, it is very important to tension the belts to manufacturer's recommendations. *UPDATE: Still having issues after tightening tensioner clockwise. Once the belt is on all but the last pulley, use your 1/2” drive ratchet or belt remover tool to loosen the tension on the pulley. This quick video will show you how to change a loose serpentine belt tensioner in your Ford F150, F250, or F350 pickup truck (1992-1996). I tightened the tension relief linkage to add more tension to the spring that you see shaking. The V-belt on the sea water pump has a pulley with a nut on a threaded shaft with a hex head. Examine the belt to ensure it is still centered in all of the pulleys. On the end of the lever is a paddle handle. The idea is for it to be just tighten enough so that the belt isn't slipping. Remove the belt, for this I am also replacing the pulley as the bearing is slightly noisy too. The tensioner is placed on the outside of the belt pushing in to enhance the self tighten affect against a pulley NRA Life Endowment member 1980 Scout II : 92 Dodge CAC , NV4500, 3. The foreground shows the mechanical belt drive fan which you had & the background shows the electric fan belt drive tensioner/pulley which is Item #7 Part #12552509 and is still available both from the dealer & RockAuto. A kit from Rock Auto (Gates TCK285) for USD $129. Replaced battery and all okay for about 1 month, then the new battery was dead. There are several write-ups on how to remove the belt already posted, do a search on "belt tensioner" to locate the one you like best. On a BUELL , the difference in the measurements is enough to make the BELT too tight at the center of the ARC if not adjusted correctly. Examine the belt to ensure it is still centered in all of the pulleys. Adjust the timing belt once the course is correct. However, I can't figure out how to get the tensioner/pulley to move to the right so I can get the belt back on?. Ok I my serpentine/fan belt is loose, and it keeps moving over on one of the pulleys. Loosen the bolt head in the center of the tensioner pulley with a ratchet Step 4. "B" marks the power steering pulley. With the new tensioner, the pulley was stable and the chirp was gone. To loosen the pulley tensioner, you need to pry off the center cap (mine was already missing) and loosen the bolt). I've also tried and managed to tighten the belt too much, since it started to have a funny noise and the freewheel didn't seem to work correctly anymore. From the ridge of the pulley to the motor mount surface, this distance should be. Loosen the tensioner lower bolt at the base of the long stud. A V-belt's purpose is to transmit energy between two components. How Idlers Are Used. Another related question, when you put the belt, how do you check if the belt is properly placed on pulleys with correct v groves. Install the crank pulley and bolt. The mower has a tensioner adjustment mechanism to ensure the belt remains tight on the drive wheel and pulley assembly. If the belt is squeeking, Then you may have a bad belt or bad pulley. Step 8 – Replace the serpentine belt with a new one. Toyota Camry 2002-2006: How to Replace Serpentine Belt, Idler and Tensioner Pulley Most engine squeals are the results of a worn out belt, idler, or tensioner pulley. Visually check which one yours is, and if you can't tell, try using the 8mm first, then T50. Pull the alternator away from the centre of the engine to tighten the belt. Any idea how to adjust the tension. Remove the belt slack on the right side of the belt (between the Camshaft, Guide Pulley and Crankshaft) by rotating the Camshaft counter counter-clockwise (around 1 degree) with a box wrench. A drive belt tensioner is a pulley mounted on a spring mechanism or adjustable pivot point that is used to keep tension on the engine belts. It's most likely your belt tension. Dodge Ram 2002-2008: How to Replace Serpentine Belt. Gently spin the fan until the tool slips into the corresponding hole on the pulley. Loosen and retorque the tensioner pulley bolt. I think when I tighten the belt tension nut on the angle drive to get the right amount of tension, it moves the angle drive slightly more forward than the left side and this is causing the belt to run inward on the angle drive sprocket and cause the problem of running against the inside lip of the rear wheel. Make sure the belt lines up straight and no wobble. Power steering belt - again you have to remove this to change the cambelt. This will tighten the belt a bit more too. I think this is what lead to the tension pulley failure that recently occurred. You should not adjust these since they are preset. hi flipstyle808, The idler pulley is at the top right of the engine (if you are looking at it from the front of the car). Locate the two wheel pulleys that the drive belt runs through. 8 8v 84 Rabbit GTI and we ran into a bunch of trouble with it trying to diagnose noise after reassembly. Break the bottom 14 mm bolt on the lower (idler) pulley. Misalignment of the accessory pulleys or a faulty drive belt tensioner may cause a chirping or squeaking sound while the engine is running. There are two types of tensioner pulleys that provide the tension on an engine's accessory belt or belts. (See ENGINE COVER REMOVAL/INSTALLATION. Multi-position timing belt tensioner wrench for VAG (Volkswagen Audi Skoda Seat) vehicles. To Tighten the Y belt, you just need to loosen one of the two anchor tabs under the bed itself, pull on the belt end, then retighten the screw with the belt end under tension. There's even a tool - Serpentine Belt Tensioner Tool - that you can rent from any local "big chain" parts store that makes this job MUCH easier. A timing belt is a very crucial part of engine operation. As the belt stretches, the spring-loaded idler pulley applies more tension on the belt. Oil will cause the new belt to slip. I will post some more on how the job went and some pictures when I have some time to do so. Another related question, when you put the belt, how do you check if the belt is properly placed on pulleys with correct v groves. I can't figure out how to change the belt from one pulley to another, to adjust the speed. You can probably get 120k miles out of the tensioner, but mine seemed to be making a rattling sound when it was cold out so I replaced it. 0 billet belt tensioner pulley has you covered on both accounts. The motor drive belt is adjusted independently from the walking belt. Acting like you're "tightening" this nut will provide the correct direction of movement to release belt tension. This would be a good time to change them if needed. To measure belt elongation, you will need to make marks on each edge of the belt and tension your take-up adjustment until the marks reflect your required tension. This will need an additional tightening in a few weeks of driving. While you're at it check your belts. "B" marks the power steering pulley. Place the studs back in the 3 holes and start to hand tighten them. Minivan Repairs: Replacing the Serpentine Belt Tensioner. Next, tighten the pivot point bolt. It is not a bolt. The pulley wheel has a central axle that runs through a. 375), the X-axis belt on your machine may not function properly and the risk of tearing or snapping a belt is greatly increased. First of all, the tensioner pulley is used to maintain the proper levels of tension to the serpentine belt. Be sure to properly set belt in all grooves on the pulley. pulleys, and tensioners; check pulley and belt alignment” in the appropriate service information for the vehicle you are working on. Dodge Grand Caravan Vehicles With This Problem. WITH TORQUE APPLIED TO THE TENSIONER PULLEY, tighten the attaching bolt, then torque to 49 ± 6 Nm (36 ± 4 ft. This will tighten the belt a bit more too. Working from the wheel arch, remove the poly-V belt. Don't sweat it. Tighten the bolt until there is about 1/2 inch of slack on the belt. Oil will cause the new belt to slip. Look for any breaks, cracks or problems with your serpentine belt. Special design allows the head to be mounted in three different orientations relative to the handle. Tensioner pulleys perform a number of important functions. Any idea how to adjust the tension. Place the timing belt on each timing belt pulley and ensure proper engagement between the timing belt pulley and timing belt teeth. Adjust the timing belt once the course is correct. I've tried to adjust the tension and managed to get rid of the slippage, so the original problem is more or less solved. Test the tension by carefully moving the belt through the pulley. Toro walk-behind mowers use a rubber drive belt to propel the wheels. Check it during three entire revolutions. On the drive belt, the alternator will be tightened down to increase vehicle’s tension. Check level and alignment of pulley shaft or belt will not track properly. Open the hood and locate the drive belt system. Bobcat drive belt tensioner failure Posted: 10/29/2006 06:29 PM: I got a eye opener this evening the belt on my 773 began to slip so I went to tighten the main hyd pump drive belt. Put Pulley back on the teniosner and turn counter clockwise to tighten you may need to get under the car the get some room to tighten STEP 9 Replace Belt. Pull the slack from the back of the tractor (transaxle pulley) and slide the belt on to the stationary and clutch idlers. I have noticed my motor belt tensioner pulley is wore out because it is squealing very loudly. Looking at the parts image below from the PartsDirect site, the mower drive belt is shown as item 20 , the tensioner pulley is item 35 and the engagement lever you use to turn on the blades is item 53. If it is less than 1/4 inch, the belt is worn and must be replaced. Make sure the two pulleys that the short loop of belt is on are aligned. The directions say to loosen locknut on front and nut on back and large mounting nut on front and tighten brass nut down to tension belt. Also shown is the store-bought tool placed on the tensioner pulley bolt. The drive belt assembly will have a specific component that tightens that belt. With the belt routed and centered in the accessory pulleys, once again relieve pressure on the belt tensioner before sliding the belt over the tensioner pulley. Secure the drive belt by reinstalling the upper belt keeper to. I used a second wrench on the end of the first for extra leverage and to reduce the chance of pinching myself. Pull other side of belt, and install it around oil pump sprocket. Set the new bet up the way your old one was exepct for the highest pulley, remove the tension from tensioner, slip belt back on last pully and let the tensioner do it's job. If your serpentine belt is too slack and you want to tension it, then you cannot. Tightening torque: 44 – 10 N×m (4) Check the belt tension, and readjust if necessary. After the pulley has been replaced, again pair up the old and new belt, then install. Install the NEW belt by rotating the tensioner counterclockwise until the NEW belt can be installed on pulleys. Be sure to properly set belt in all grooves on the pulley. The A/C Belt Tensioner Pulley plays a crucial part in giving your vehicle's A/C system constant power. To adjust the tension of the drive belt, use the wrench to loosen the adjusting and mounting bolts. Often times, simply tightening your take-up adjustment until the belt does not slip on the drive pulley under a full load is sufficient for tensioning a new belt. Using either a long breaker bar on the belt tensioner pulley bolt, take the pressure off the serpentine belt - this is the belt that drives your alternator, water pump, power steering and fan, etc. On these vehicles, you have a diagram right here that helps you put your belt on. In fact, a V-belt that is over-tensioned by 10 percent can produce a 10 percent reduction in bearing life of the motor, and over-tensioning is also the leading cause of V-belt failure. In making that adjustment, you inadvertently create an adverse condition: When the driven load is less than maximum, belt tension is greater than necessary. 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 way to remove tension will be to pivot the tensioner using a tool (1) on the nut of the tensioner pulley, or (2) a special tool-lug outcropping from the tensioner or (3) in a square opening in the bracket of the tensioner pulley, cover or cap that protects the spring. The tensioner (circled) needs to be adjusted to remove the belt. Using a screwdriver, push the tensioner from the top to release the tension then tighten the upper bolt. But it felt plenty tight given that it only holds the pulley, not the whole tensioner like on the idler pulley. Step 2: Loosening the alternator bolts. Step 3 - Loosen serpentine belt tensioner. Put the short loop of belt back on the y motor pulley by again lifting the motor up. I replaced it with a Gatorback belt from autozone. The main function of a tensioner pulley is to maintain tension on a drive belt or chain so that there is no slippage or skipping of chain links under typical loading. And if you're looking to replace your old component, simply pick one from Auto Parts Warehouse's extensive selection of quality tensioner pulleys today. Fit the belt,let go of the spring tensioner,move the other pulley with a key to tighten the belt more and. Spring tensioners are designed to tension automatically. WD40 might help quiet things in the short run but it won't last and could break down what little lubrication is left which would hurt you in the long run. I guess the silly question is in which direction do I push the tensioner to move the arrow indicator or make tension on the belt. To adjust the belt tension, you must first remove the pulley nut. It seemed sort of loose and looking at the tensioner pulley arm the notch is pointer over to the far left. 96 New Pulley Tensioner Brand Vitara 2. Finally, if someone has a diagram on how to route the belt that would be great because it looks like I did it correctly but it is no where near making it around the tensioner the way I'm looking at it. These serpentine belts require no tension adjustment as they incorporate an automatic belt tensioner. Using a caliper, measure the outside diameter of the belt, while it’s wrapped around the pulley. Push the tensioner down as far as possible and do up both bolts finger tight. This shows the tension pulley and the bolt head that holds it on (A). With the accessory belt tension pulley, locating and replacing this is even simpler because there aren't any major devices connected to it. Once you have it aligned, use the belt tensioner tool with the 14mm socket or a 14mm wrench to tighten the bolt. After the pulleys have been aligned, it is very important to tension the belts to manufacturer's recommendations. 7L-V6 Pulley 06-14 Brand Tensioner Vitara. On the drive belt, the alternator will be tightened down to increase vehicle’s tension. Appearance: Move the tensioner arm (tensioner being mounted on the engine) through its entire range of motion with a wrench. Rotate the tensioner pulley, by hand (it will be located just below the alternator) away from the belt to release the tension on the belt. Rectify the tension to center of the belt: if you tighten on the left side, the belt must moves to the right (See figures B & C). The tensioner has a second hex head on it. Belt slipping on pulley face Adjust tension at take-up device. Tighten the nut to 50 ± 5 Nm (that's pretty darned tight). I sanded off the rubber from the belt and the squealing stops until the belt starts rubbing again after about four days. A/C belt tensioner pulley WP / Alt / PS belt tensioner pulley 5. Unfollow caravan belt tensioner pulley to stop getting updates on your eBay Feed. A timing belt is a very crucial part of engine operation. It will obviously move. Loosen the nut of the alternator pivot bolt. The tensioner spring in the OE tensioner was weak. N b = speed of pulley b. It will add the correct tension for you. Pull belt out of the left spindle pulley to release belt tension on the mower belt idler spring. Now, when I tighten the tensioner, it screws in, but doesn't tighten the belt hardly at all? I'm not sure if I'm explaining myself the right way. Learn how to fix a squeaky tensioner pulley in your car. Nissan Maxima Timing Belt Change Tutorial. also, when putting the belt back on, its easiest to route the belt around all of the pulleys except the crank first and then put it on the crank as you turn the tensioner bolt. Replace the belts using the same procedure as for tightening, except remove the old belts and install new ones before loosening the pump pulley screws. The belt is non adjustable. P = power transmitted. Amazingly, it wears out (not the bearing, but the pulley) in 100 hours or so, such that the belt rides up on the pulley, causing it to rub on the flywheel. It may help to temporarily tighten the right hand nut on the tensioner to keep it compressed while you remove the belt from the pulley. Dismantling. In If the replacing the belt tensioner does not correct the noise, the alternator pulley may require replacement. Hold the tensioner kind of with my knuckle while I start the bolt in. 50 BFG KM2, HE221W 6cm2 , 3200 GSK. Check for any resistance on. Belt tension while starting the system : Initially during the start of a conveyor system, tension in the belt is much higher than the tension in steady state. Another related question, when you put the belt, how do you check if the belt is properly placed on pulleys with correct v groves. Open the hood and locate the drive belt system. The idea is for it to be just tighten enough so that the belt isn't slipping. Using a screwdriver, push the tensioner from the top to release the tension then tighten the upper bolt. 1 as far as it will go. Step 5 - Testing the Timing Belt Tensioner. Examine the belt to ensure it is still centered in all of the pulleys. *UPDATE: Still having issues after tightening tensioner clockwise. Step 3 – Remove and replace the belt while the tension is off. Use the bolt in the middle of the tensioner idler pulley to spin the entire tensioner with a socket and the breaker bar. From what I understood in the video, you have to tighten the tensioner before you tighten the pulley otherwise it will break. Check fit of inner race to ensure against bearing distortion. You get those measurements from a particular tool, which most people don't have. Install the water pump pulley. Mine looked fine and I did not replace it. Order Chevrolet Corvette Belt Tensioner online today. The pointer was not budging, so I took the tensioner all the way off. If there is any play, tighten the belt until play is eliminated. Ok I my serpentine/fan belt is loose, and it keeps moving over on one of the pulleys. Remove the tensioner by moving forward and twisting out and up. On these vehicles, you have a diagram right here that helps you put your belt on. MD998752 (part # changed to MD998767, contact Miller Tool for this tool - 800-801-5420) and apply 2. You may have over tightened the belt which would prevent the belt from turning and caused the crankshaft pulley to rub the belt. There are several write-ups on how to remove the belt already posted, do a search on "belt tensioner" to locate the one you like best. I was never able to get the torque wrench to click. DIAGNOSING BELT & PULLEY NOISE: 1) With the engine running (and the noise present) use an atomizer bottle to spray the inner ribbed surface of the belt with a small amount of water. Belt tensioner pulleys are integrated into the belt tensioner assembly and, in most cases, must be replaced with the entire assembly. 2L, AWD, 140k miles. The pulley will wobble to remove belt as long as the bolt is loosened enough because the belt is removed and the pulley will be loosened. Like the cylinders on the motor. should I tighten it more/add more tension to reduce shaking? Conclusion: I obviously need a new belt, but I don't see how the idler pulley could be shaking THAT aggressively just because of a bad belt. To loosen the tension on a serpentine belt on a 2005 Grand Caravan 3. If the belt is squealing at start up then it could have a worn belt, belt debris in the grooves of the motor pulley,. Most vehicles have what is called a serpentine belt. The smaller the pulley the greater the flex, of the belt and greater the wear. However, the spring on the idler pulley has its limitations and when the belt stretches too far, the idler pulley no longer has the ability to compensate for the added length of the belt. 7 Nm (24 in. Then, tighten the bolts. Turn the. Insert the pry bar above the alternator pulley. Insert the two pulleys into the tensioner module. Since you gave no information on the make and model of your vehicle, I am going to assume it is a modern vehicle (like no more than 20 years old). However, I can't figure out how to get the tensioner/pulley to move to the right so I can get the belt back on?. Tighten the bolt until there is about 1/2 inch of slack on the belt. After you do whatever you need the belt off for, you can tighten the belt by tightening the first bolt until the tension is right, then tighten the bolt on the pulley itself to keep it in place. Adjusting the spring tension on the driven pulley changes the rpm range at which the unit shifts into high gear. If there is any play, tighten the belt until play is eliminated. Again, three bolts are used to adjust this tensioner. If you really have to, you could put the socket on first, then put the torque wrench on. You may have over tightened the belt which would prevent the belt from turning and caused the crankshaft pulley to rub the belt. Break the bottom 14 mm bolt on the lower (idler) pulley. I have noticed my motor belt tensioner pulley is wore out because it is squealing very loudly. The way to remove tension will be to pivot the tensioner using a tool (1) on the nut of the tensioner pulley, or (2) a special tool-lug outcropping from the tensioner or (3) in a square opening in the bracket of the tensioner pulley, cover or cap that protects the spring. On the belts, to test the proper tension. Re: Can the Drive Belt tension be adjusted Doc, have a look in the "ez-go tech" section at the top of the ez-go ga section. If you would like any other information, Please let me know. Step 3 - Loosen serpentine belt tensioner. It is just easier to say the belt tightens. Press down in the center of the belt between the two camshaft pulleys with a force of 22 Lbs (98 Newtons). Amazingly, it wears out (not the bearing, but the pulley) in 100 hours or so, such that the belt rides up on the pulley, causing it to rub on the flywheel. Put new belt around pulleys per your sketch. About this tutorial: Video duration: 7:56 Buy Now! New Serpentine Belt Tensioner with Pulley from 1AAuto. ALTERNATOR DRIVE BELT TENSION ADJUSTMENT 1. Correctly tension the PS pump drive belt using its tensioner pulley. No more squealing belt. Swapping out those noisy pulleys and belts its actually a pretty simple task that doesn't require any special tools or skill. Oil will cause the new belt to slip. Locate the adjusters with adjuster. Rotate it away from the belt and remove the belt. Rectify the tension to center of the belt: if you tighten on the left side, the belt must moves to the right (See figures B & C). Make a diagram of the belt routing around the pulleys (otherwise you are sure to forget!). Release belt tension from stock tensioner and remove. Camshaft oil seals - these are located behind the camshaft sprockets and are fitted into the head. Step 5 – Install your new belt. Now you need to tighten the slider bolt and the tensioner lock bolt. No more trying in vain to get the belt tight enough using whatever lever I can find. The drive belt transfers the torque from the engine to the rear wheel. In more severe instances, a bad tensioner pulley can cause the drive belt to break. 5 engine then you have two tensioner screws on the bottom side. Here you have to move the tensioner away and slide the belt onto the last pulley. What this all boils down to is that the belt tension will tighten up when the three points are in a straight line, which is when you sit on the bike and as the suspension swings up and down the arch. Ok I my serpentine/fan belt is loose, and it keeps moving over on one of the pulleys. Rotate the tensioner arm until it contacts its stop position. The mower has a tensioner adjustment mechanism to ensure the belt remains tight on the drive wheel and pulley assembly.