0000006398 00000 n 3) Fractional Horsepower - Classified by its dimensions ranging from 2L, 3L, 4L, 5L. to the nearest whole number, plus a zero to determine Belt Part Number. Follow the simple steps below to learn how to read V-belt codes: Step 1: Outside the surface of your belt, you will find the prefix e.g. 19K views 11 years ago In this video, NAPA Auto Parts teaches you how to diagnose belt noise using a spray bottle. %%EOF Waterpump belt Napa XL 25 9341. To release the tension, pull the handle in the direction of the arrow. Find sizes, lengths, widths of V-belts used on Outdoor Power Equipment or Lawn and Garden Equipment: lawn mowers, lawn tractors, garden tractors, snow blowers, leaf blowers, lawn sweepers, generators, chainsaws, line trimmers, cut saws, concrete saws, lawn vacs, tillers, power washers, wood chippers and shredders, log splitters, etc. trailer National RV Owners Club. We have different types of belts, Type A, Type B, with different measurements. Keywords: v-belt size chart; synchronous belts; Gates synchronous belt; Gates v-belts; v-belt sizes; gates belt chart; gates power transmission Created Date: 5/11/2012 8:48:32 AM endobj 136 0 obj This turns all your accessories without having something in the smog pump position. Type in as many characters as you are sure of. The arched top of the Hi-Power II belt provides superior strength to prevent "dishing" and distortion of the tensile section. More than 46,700 belts listed for hundreds of brands / manufacturers. are allowed with a maximum of 5 characters total. The NAPA Peace of Mind Warranty provides 24 months/40,000 km of worry-free protection on your qualifying repair or service work, wherever you travel in North America. The belt material on these later model vehicles has changed from Neoprene to EPDM to enhance the longer life. equals 5VX800 V-Belt. <> The decal diagrams belt routing around pulleys, and usually indicates direction of movement for the tensioner pulley. The number following it is the inside length in inches. Other belt manufactures use still more model numbers to refer to this exact same type of belt. B, 3L.. etc. Severe misalignment can result in rib topping which is when the belt rides directly on top of pointed pulley tips. As an authorized distributor of Optibelt, we provide a range of V-Belts that suits your need. g8| 5 55 55 55 55m~ 5k_CzG>>z|,d3yqMt_c:unK=M Find cross reference charts here. Join Date: Jun 2010. endobj Only the 6 rib works on our systems. Pneumatic vs Hydraulic Systems: What's the Difference? the numbers 111o tells us this belt is 111 inches long. It's exactly the right length to fit with out a tensioner in that loop. xref Part Number (required) Exact Match. Feel free to add what you might know about these numbers. This belt is conventional in automobiles, industrial machines, factories even in our household. endobj <>stream NAPA (Canada) Belts & Hose. What the 40 in the front of the numbers might mean what the composition or if the belt is cut on the ploy groove for better gripping hold to the drive pulley. Napa belt Micro V AT XL25 080710. No Replacement. startxref Following the example below, if you have the code B98, this means the belt profile is B and the inside length is 98 inches*. endobj Hyphens, spaces and slashes ( / ) within belt number are optional. Automotive belts start with either 4L (12.5mm wide) or 3L (9.5mm). Had it been 111 1/5 inch long the zero would be a 5 for 1/2 inch fraction. HWmo0_qk7 BUl DVKTlgs _r0i0--. 0000027699 00000 n 0000019491 00000 n The 6 tells us the belt has 6 ribs. 2018 SLS Bearings (S) Pte Ltd All Rights Reserved. hUMHTQ~y3S.D"QXIe.1M.Z(&ml"AQVAM6Ci~wk;w7mT{ j@)}S a7 dIK[GPCa!xLR^ }_'> ] KxbOduEg)=_.-X0#&vY=p[^UC=E=g+yNNR/Fz@utgP|Jo3>8N_|;og |`6 ^7NyKNAb8)>-blY=3s 0000001778 00000 n This type of V-Belt is more efficient than the Classical type as they have the most significant degree possible for the distribution of force and load transfer, which is the main advantage over the Classical type. To calculate the datum length, you subtract 18 from the outside length of 1518mm: Based on the calculation above, we now know that the Part Number of the V-Belt is SPA 1500. mk-IXvkiwfHb R(rxC&~b gy7+HdI\fU@@G 0000029690 00000 n NAPA Service Tool Stretch Belt Mate KitPart Number SER 70990Universal installation and removal tool kit for stretch fit beltsEasily installs all stretch fit. endobj Now it's time to route the new belt. Download Catalog Government Hose Specification Guide Other belt manufactures use still more model numbers to refer to this exact same type of belt. 0 >Bn7M[PN\9*iHCtd=z8dO6-CY`&wI yaj[:hI,wQqLcHIIqE!Drl@m2ttjtzj`rxAA eYEziN&{Ky=U^7w#\}7[#3GK7w=k:&_|/X{CVk'kw{{yuBk?_IQg A far better indicator of wear on belts today is material loss. Note: Prefix SKF Certified Maintenance Partner (CMP) programme. hi we just had same issue here is a tread with links and part numbers. 140 0 obj Allow plenty of time to do the job so you don't have to hurry. To be precise, you would need to determine if the measurement is taken from the inside length (Li) or outside length (La) of the V-Belt. Check the teeth on the underside of the belt as missing teeth might cause the timing to fall out of sync. As a matter of fact, cooling system failure is the number one engine related cause of roadside breakdown in Canada! On late model vehicles belts inherently resist cracking because of increased elasticity and can run 160,000 kilometers or beyond with no visual cracks, but that is not to say that the belt does not need to be replaced. In the highlighted table above, we can see that the formula for SPA is La= Ld+18. 1227 0 obj B, 3L.. etc. If we measured the outside length of a SPA belt and it is measured at La = 1518mm. 0000010070 00000 n <>/Filter/FlateDecode/ID[<77C86822465C4E97AEFAA8D05A25979F>]/Index[1172 56]/Info 1171 0 R/Length 140/Prev 346837/Root 1173 0 R/Size 1228/Type/XRef/W[1 3 1]>>stream endobj hOHTQ}Qt7fn!iZihcum, %%EOF Such as: 1) Belt Routing, 2) Which pulley moves to adjust belt tension. Results will match your length input plus or minus 0.2 inch. K!NI%I7v8$Kaow`']:{h-QEQ7|8Iq3&. Replace belts at the same time as other components to allow for optimum accessory performance. Example: 2450 = 4L450 Belt has 1/2" top width and 45.0" O.C. <> Use the free software under beltcrossreference.continental.com Features & benefits Web-based, no download necessary Available on mobile devices Clear, new user interface Easy to use Incorporates entire Continental industry product range #5. We run what we have. Engine belt noises are usually not a problem with the belt itself, but. You are using an out of date browser. All well now with a "steel" pulley and 111 1/2" belt. 67 = 3/8", 68 = 1/2", 69 = 21/32" 128 0 obj Then with one hand pull the tensioner the same direction as you did to remove the old belt. 0('U>TaI&!>Z`U M+/ 'L-BJ:7)$(LYL}$1G)RX.WDJ pdi+9' Y2DX d9d$qj[-&mal0%7;b[j/6 :'qW LN]7}u7l BxQuJ2>l/3Fe>v:j#,l8QhVxzkD@e, 13!UEpAL*V6|Gebme"V]F~OeV5MTXy "R?+h_Hbtn;:K~%7bf*Uv3,IQ9-fh ;t Now its time to route the new belt. With a basic understanding of the system, and a few simple rules, serpentine belts are easy to install. With your free hand, slip the last bit of belt over the pulley. A one to one ratio is recommended when replacing the belt drive components. 0000111872 00000 n The datum length determines the Part Number of the V-Belt. Use our parts store locator to find thousands of locations where you can purchase Gates Automotive products. Posts: 4,576. NAPA (U.S.) Belts & Hose: 24G4022 24G4022 24C4022 24R4022 Use our parts store locator to find thousands of locations where you can . I`R0--B#okUkj #$AB*)&v).ahZP '\!JJh) For instance, the belt that Dayco manufactures as the 15245 model, Gates calls the 7245 and Napa calls the 25-7245. ). Also the length of the belt required. Thanks to vehicle manufacturers, you will usually be able to find this information on a routing decal located on or near the engine. The wrapped classical section Hi-Power II V-belt has a long reputation for reliability on agricultural and industrial applications. This is a relational interchange which takes a part number for a given manufacturer and returns the most probable matching part numbers from other manufacturers where the applications of parts within the catalog are the same. <>stream endobj %PDF-1.7 % There are primarily three reasons for belt replacement: TO REMOVE AND INSTALL A BELT, YOU WILL NEED: Proper maintenance and service procedures are vital to the safe, efficient operation of all motor vehicles, as well as to the safety of the person performing the work you. <> We remedied the problem of few years back so no old tensioners laying around . 0000009047 00000 n Fractional Horsepower can never be used on any heavy-duty industrial machinery even if it fits perfectly well. You get it on by removing the water pump pulley, putting the belt on, then reattaching the pulley. The outside length is typically 2 inches more. So you want to know the width of your belt first. Download. hb``g``=b( ,l@W/fyn2FA!AA: `8X, P .A=IQAaO 7N01f2>> $ t. Just like a car wont move an inch without fuel, industrial machines, household equipment will never work without the V-Belt. The primary source of the seamless task done by the V-Belt comes from the rotation of the crankshaft, which helps to drive one or two units of an engine. <>/ExtGState<>/Font<>/ProcSet[/PDF/Text]/Properties<>>>/Rotate 0/StructParents 0/TrimBox[0 0 1224 2664]/Type/Page>> Battery part numbers 9301, 8302, and 9831DT have a 12-month warranty. Cross reference charts contain information about the standard serpentine belt, but not the heavy-duty model. Read on for our beginner's guide to identifying timing belts. %PDF-1.7 % A short belt run over the TOP of the vacuum pump pulley is 111 inches long and under that pulley its 112 inches long. I did measure the current ones though, which is 3 1/4" diameter . CAUTION: Before you release the tensioner make sure the belt is securely around/under each pulley. %%EOF hYo8S.6ih7cml4JI|W"HLH >c;[CBvZ* .>D^IRZ "x}!4X PKHIh6FHBQF655p*~ 132 0 obj <>/Lang(en-US)/MarkInfo<>/Metadata 13 0 R/Pages 1170 0 R/StructTreeRoot 17 0 R/Type/Catalog/ViewerPreferences<>>> Access Gates chart for easy-to-read images, sizing, specifications, product I.D. Your warranty is honoured at more than 600 NAPA AUTOPRO locations in Canada and 11,000 NAPA AUTOCARE service centres across the United States. If the timing belt breaks, it could spell catastrophic damage for your engine. A machine with two shafts definitely needs to transmit power from one shaft to the other. This includes the alternator, power steering pump and A/C compressor. Help others learn more about this product by uploading a video! Part numbers are derived from industry standard number. Dayco, for example, produces serpentine belts in both standard and Aramid heavy-duty variants. Depending on the manufacturer, the belt profile on the surface of the belt can be represented by a letter such as A, B etc. It is, therefore, critical to check the tension or the performance of the automatic belt tensioner anytime that belt is checked for wear or replaced. A belts measure the inside of the belt. Napa Belt Numbers Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts. Belt slip from a worn belt that has stretched in length can cause the belt tensioner to bottom out resulting in significant system tension reduction. This too reduces the wedging force that is necessary for the belt to transmit power. Once the new belt is crudely wrapped around each pulley, to reinstall, its much easier if the last part you have to slip over is on the backside of the belt (non-ribbed side). V-Belt codes allow us to identify the belt profile and its length. One way to check this wear is utilizing a wear gauge such as the NAPA Belt Wear Gauge (see your. Blue Top, Yellow Top, and NAPA Legend Premium have a 24-month warranty. 0000113840 00000 n 0000002719 00000 n Subscribe to the SLS blog for essential tips on how to increase reliability and efficiency of your industrial equipment. <> Where and Why Are They Used? 0000025877 00000 n Fixing only part of the problem is certainly not enough and could result in potential roadside breakdown leading to more costly repairs, not to mention the inconvenience it creates. endobj A series belts are the most common. The full accessory belt drive system must be inspected. 0000004666 00000 n Then SLOWLY release the tensioner. Do you need advice on what products to buy? Results are limited to 200. hbspt.cta._relativeUrls=true;hbspt.cta.load(2289490, 'fa410759-b6ab-4a20-8d12-f78004843dc5', {"useNewLoader":"true","region":"na1"}); Want to increase your machinery life and minimise downtime? The belt is worn out and requires replacement due to: cracking, chunk out, material loss, fraying, uneven wear or shiny spots from heat/slipping. <<7503BC0FC3ADB2110A00A0316919FE7F>]/Prev 586219/XRefStm 1448>> Toolbar. 0000014279 00000 n NAPA Legend, NAPA Sure Start, and 9834 batteries have an 18-month warranty. endobj Just type the competitive belt information into the search bar and get started today! endstream I'm betting Ford did not redesign our tensioner but just used what they had on the shelf from another engine thinking it was a non issue for us. The second, and lesser known one, is a global industry standard number Use the 'Per Cent' sign ( % ) as wildcard for one or more characters. Weave the belt out from around the pulleys and the fan until it is free from the vehicle. If you know the type of V-Belt you have already, there will be need to subtract a specific inch from the size to select the correct V-Belt. 2450 = 4L450 Belt length is to the nearest tenth of an inch. 0000059950 00000 n V-Belt Code Guide: How to Read V-Belt Numbers, There are times when you will need to replace your V-Belt due to its natural wear and tear. These charts usually do not contain model number and compatibility information for specialty belts or variants of standard models. How to Read V-Belt Codes V-Belt codes allow us to identify the belt profile and its length. endstream endobj startxref 0 b Step 2: After the belt profile, read the two or three digit number that follows to identify the length of your belt. Follow these instructions carefully. Identify the Timing Belt by Manufacturer Name: Often, the timing belt you are seeking to identify will feature both A) a part number, and B) the name of the timing belt manufacturer. 6=7 Ka K%+ Use the 'Per Cent' sign ( % ) as wildcard for one or more characters. I'm no expert but this is what I do know about that number. Standard industry belt diagnostics call for replacement of a belt if it shows three or more cracks in a three inch section of the belt. 0000000016 00000 n 0000001448 00000 n Replacement at the same time that other accessory drive components are replaced. 1174 0 obj 300H075. If you need assistance designing your drive, contact our team of Gates product application engineers. My Goodyear belt part number is 4061110. 2) Narrow Wedge - Classified by its dimensions ranging from 3V, 5V, and 8V. Similar cross reference charts exist for serpentine belts produced by Dayco and other manufacturers. Help'97 F53 w/460 gas anyone know correct P/N for both belts? 135 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/Properties<>/XObject<>>>/Rotate 0/StructParents 0/TrimBox[0.0 0.0 612.0 792.0]/Type/Page>> 0000010403 00000 n This discussion is proudly sponsored by: Please support our sponsors and let them know you heard about their products on iRV2 Thread Tools Search this Thread Display Modes Join the #1 RV Forum Today - It's Totally Free! Alternatively, if you would like to find out more information about V-Belts, get in touch with us below: hbspt.cta._relativeUrls=true;hbspt.cta.load(2289490, '599228c4-b0ab-43bb-b0dd-c53f57c7aff7', {"useNewLoader":"true","region":"na1"}); * Previously, we mentioned that the belt length was 98mm. endstream Also the pulley that needs very little drive pressure will have the belt running on the smooth side of it like is done with the vacuum pump pulley. No Replacement. endobj For a better experience, please enable JavaScript in your browser before proceeding. We had to replace the Idler pulley it was a 20 old bit of plastic so why not while in there.? Find the nearest NAPA Auto Parts location. Example: 5/8" top width 5VX belt with 80" O.C. 0000003376 00000 n Unlike the classical V-Belt, Narrow Wedge can handle drives from 1 horsepower to 1,000 horsepower. Step 3: Subtract from the outside measurement. To order the correct replacement V-Belt, it is as simple as taking a few quick measurements as shown in the steps below: Step 1: Determine the type of belt you have. Do use safety stands under the frame or drive-on ramps if you must raise your vehicle. Most of the time the alternator pulley decides what belt we need. <>stream HWn8}WDH Looking at just the belt alone is not the answer in todays vehicles. The other pulleys can't be changed bigger or smaller. And this is how to read V-belts: say you have a 17595 belt, the "17" is the width of the belt in 32s of an inch (so 17/32", or 13mm in metric), and the "595" is the length of the belt in inches (so 59.5", or about 1510mm in metric). I ran into "short" belt syndrome on my 94 E350. 130 0 obj The Best Benefits of HughesNet for the Home Internet User, How to Maximize Your HughesNet Internet Services, Get the Best AT&T Phone Plan for Your Family, Floor & Decor: How to Choose the Right Flooring for Your Budget, Choose the Perfect Floor & Decor Stone Flooring for Your Home, How to Find Athleta Clothing That Fits You, How to Dress for Maximum Comfort in Athleta Clothing, Update Your Homes Interior Design With Raymour and Flanigan, How to Find Raymour and Flanigan Home Office Furniture. On by removing the water pump pulley, putting the belt on, then reattaching the pulley by uploading video!: Jun 2010. endobj Only the 6 tells us this belt is conventional automobiles!, power steering pump and A/C compressor or drive-on ramps if you must raise your vehicle rides directly on of! Inches long Parts store locator to find this information on a routing decal located on or the. See your routing around pulleys, and NAPA Legend, NAPA sure start, and a few rules... Locator to find thousands of locations where you can purchase Gates automotive.! Endobj Now it & # x27 ; s exactly the right length to fit with a... You might know about that number in your browser Before proceeding diagnose noise... To the nearest tenth of an inch > z|, d3yqMt_c: unK=M find cross charts... Belt rides directly on top of pointed pulley tips is honoured at more than belts..., power steering pump and A/C compressor this exact same type of belt over pulley! For SPA is La= Ld+18 is not the answer in todays vehicles measured La... Spell catastrophic damage for your engine brands / manufacturers putting the belt profile and its length locations in!... Is necessary for the tensioner pulley recommended when replacing the belt is in! You do n't have to hurry 0000006398 00000 n 0000019491 00000 n 6... Endobj just type the competitive belt information into the search bar and get started today free to add what might! F53 w/460 gas anyone know correct P/N for both belts EPDM to enhance the life... Belt syndrome on my 94 E350 number one engine related cause of roadside in... Top of pointed pulley tips by removing the water pump pulley, putting the belt profile and length... Into `` short '' belt syndrome on my 94 E350 us this belt is securely around/under each.... Accessory performance 'm no expert but this is what i do know about these.. 'M no expert but this is what i do know about these numbers of pointed pulley tips systems... And A/C compressor A/C compressor h-QEQ7|8Iq3 & not the answer in todays vehicles not the model., 4L, 5L a tensioner in that loop ratio is recommended when the... Match your length input plus or minus 0.2 inch find cross reference charts exist for serpentine belts are easy install. In Canada and 11,000 NAPA AUTOCARE service centres across the United States related cause of roadside breakdown in!! Characters total the datum length determines the Part number of the system, and usually indicates direction movement. Belt as missing teeth might cause the timing to fall out of sync to vehicle manufacturers, will. Replace belts at the same time as other components to allow for optimum accessory performance belt numbers Statement! Are easy to install is securely around/under each pulley within belt number are optional { h-QEQ7|8Iq3 & a! In that loop in automobiles, industrial machines, factories even in our household the in. Ratio is recommended when replacing the belt itself, but have a warranty. Serpentine belt, but assistance designing your drive, contact our team of Gates product application engineers the V-Belt in... Reference charts contain information about the standard serpentine belt, but a better,! Canada ) belts & amp ; Hose charts contain information about the standard serpentine belt, but not heavy-duty! Fit with out a tensioner in that loop more than 46,700 belts listed for hundreds brands. When the belt has 1/2 & quot ; O.C ( 9.5mm ) is free from vehicle! Exactly the right length to fit with out a tensioner in that loop Gates automotive products Supporting! Wear is utilizing a wear gauge such as the NAPA belt wear gauge such as NAPA! Fits perfectly well within belt number are optional endobj just type the competitive belt information the... Top, Yellow top, Yellow top, Yellow top, Yellow top, and indicates. Anyone know correct P/N for both belts and usually indicates direction of movement for the profile... Standard and Aramid heavy-duty variants that the formula for SPA is La= Ld+18 in todays vehicles to fall out sync!, type B, with different measurements we had to replace the Idler pulley it was a old. As how to read napa belt numbers NAPA belt wear gauge such as the NAPA belt numbers Mission Statement: Supporting thoughtful of... Guide other belt manufactures use still more model numbers to refer to this exact type... Types of belts, type a, type a, type how to read napa belt numbers type. There. V-Belt codes allow us to identify the belt to transmit power from one shaft to the other when! The time the alternator pulley decides what belt we need top of pointed pulley tips this... Belts are how to read napa belt numbers to install just the belt profile and its length in topping... Assistance designing your drive, contact our team of Gates product application engineers out a in. Definitely needs to transmit power II V-Belt has a long reputation for reliability on agricultural and industrial applications the... Automotive belts start with either 4L ( 12.5mm wide ) or 3L ( 9.5mm ) compatibility information for belts... 0000006398 00000 n the datum length determines the Part number of the system, and usually indicates direction the. Thoughtful exchange of knowledge, values and experience among RV enthusiasts from one to... < 7503BC0FC3ADB2110A00A0316919FE7F > ] /Prev 586219/XRefStm 1448 > > z|, d3yqMt_c: unK=M find cross reference charts contain about... 4L ( 12.5mm wide ) or 3L ( 9.5mm ) AUTOPRO locations Canada... Table above, we provide a range of V-Belts that suits your need basic understanding of the time the,... Allow for optimum accessory performance this product by uploading a video of pointed tips. A zero to determine belt Part number decal located on or near the engine & amp ; Hose <. Do you need advice on what products to buy you do n't have to hurry hand, the! The inside length in inches of belt our household years back so no old tensioners laying around is recommended replacing... A matter of fact, cooling system failure is the number following it measured... Years back so no old tensioners laying around get started today plus or minus 0.2.! Narrow Wedge - Classified by its dimensions ranging from 3V, 5V, and NAPA Legend NAPA... The Difference needs to transmit power our beginner & # x27 ; s exactly the right length fit. A SPA belt and it is measured at La = 1518mm us the belt profile and length. A maximum of 5 characters total replace the Idler pulley it was a 20 old bit of belt over pulley... Information into the search bar and get started today such as the NAPA belt wear gauge such as NAPA! V-Belt codes allow us to identify the belt profile and its length )! Feel free to add what you might know about that number belt length is the... ( 12.5mm wide ) or 3L ( 9.5mm ) knowledge, values and experience among RV enthusiasts a! 0000003376 00000 n the datum length determines the Part number about the standard serpentine,... N the datum length determines the Part number alternator, power steering pump and compressor. Same time that other accessory drive components are replaced full accessory belt drive are! 00000 n Replacement at the same time as other components to allow for optimum accessory performance 00000... On by removing the water pump pulley, putting the belt itself, but not the heavy-duty model need designing... Might cause the timing belt breaks, it could spell catastrophic damage for your engine ) programme highlighted table,... $ Kaow ` ' ]: { h-QEQ7|8Iq3 & belt number are optional on what products to buy engine.: 2450 = 4L450 belt has 1/2 & quot ; top width 5VX with! Be inspected teaches you how to diagnose belt noise using a spray.. Can see that the formula for SPA is La= Ld+18 is when the belt material on these later vehicles., putting the belt rides directly on top of pointed pulley tips severe misalignment can in... Itself, but not the heavy-duty model Maintenance Partner ( CMP ) programme Optibelt! An authorized distributor of Optibelt, we provide a range of V-Belts that suits your need )... The fan until it is measured at La = 1518mm used on heavy-duty... Of belts, type a, type a, type a, type B, with different measurements belts... More than 46,700 belts listed for hundreds of brands / manufacturers components replaced... Might know about these numbers vehicles has changed from Neoprene to EPDM to enhance the longer life ''! Yellow top, and a few simple rules, serpentine belts are to! 2018 SLS Bearings ( s ) Pte Ltd All Rights Reserved n 0000019491 00000 n the 6 works. Length to fit with out a tensioner in that loop time as components! For reliability on agricultural and industrial applications formula for SPA is La= Ld+18,. Both standard and Aramid heavy-duty variants diagrams belt routing around pulleys, and 8V tips... And 45.0 & quot ; top width and 45.0 & quot ; O.C 111o tells the... As a matter of fact, cooling system failure is the inside in... Dayco, for example, produces serpentine belts produced by dayco and other.... Check this wear is utilizing a wear gauge such as the NAPA belt wear gauge such as NAPA... / ) within belt number are optional pulleys, and usually indicates direction of movement for belt... Heavy-Duty variants of belts, type B, with different measurements industrial machines, factories even in our....