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Sheave Size

Sheave Size

You might at first think that changing your evaporative cooler belt is easy. Why spend your valuable time reading about it? Keep reading; because this information could not only give more time between changes, it could also possibly save bearing problems down the road, and hundreds of dollars in costly repairs.

*Tips to Keep in Mind

Most residential coolers originally come with a 4L V-belt (ex. 4L 55). These work just fine but, they usually stretch some through their lifetime. When it stretches to the point where squealing is heard you often notice that it still looks to be in pretty good shape. Most people use the motor mount adjustments to tighten it and everything is fine. Or is it? Usually by the time it stretches again it must be changed.

When it comes time to replace it, many owners neglect to readjust the motor mounts back to their original positions. This is where the trouble starts! When a brand new belt is put on the tension will be set far higher than the manufacturer's suggested tension setting. Most people think it will just stretch again right? Big Mistake! This puts far more wear on the bearings and cause premature bearing and motor failure. Changing a bearing on a cooler that has had moisture in it for several years can be a nightmare!

*Expert Suggestions

To make your life easier, here are two suggestions. First, instead of changing the original belt with another 4L, try using an A (ex. A 55). The A width is the same and they are for heavy-duty wear. In sizing the A you must keep in mind that the A is always two sizes smaller than the 4L. For example, a 4L 50 means that it is 50 inches around if you measured the outside length. For an A that is 50 inches outside diameter it would be an A 48, because they are measured on the inside. So you always need the A to be two numbers smaller than the 4L to have the same size. They are a little more expensive but, they usually last twice as long with less readjusting.

Second, make sure, with either one you use, that you set the pulley tension to the original setting. To test tension, press on the belt half way between the motor sheave and the fan pulley. A 3lb. force should deflect it 3/4 of an inch. Usually only two things will cause premature wear. Either the tension is too tight or the pulleys are not in line with each other. If both of these are correct you will get more life out of your evaporative cooler belt.

I've worked in the evaporative cooler industry for 25 years and have installed and maintained units from all major brands of evaporative coolers. Through the years I've learned many trade secrets and valuable tips for working on evaporative coolers. For more tips like these please visit http://www.swampcoolersonline.com.

Greenlee 332659 19094 TrayType Sheave $163.9 Steel frame easily attaches to cable tray up to 2 (50.8 mm) thick. Helps roll and guide tray pulls. Aluminum alloy sheaves with self lubricating bearings. Size: 22 . Width: 5 . Material: Aluminum Alloy. Applications: Cables.

Sliding Sheave $14.87 Sliding Sheave for 50cc 4-stroke QMB139 engines. Shop our wide assortment of scooter parts , gas scooters , electric scooters , and motorized scooters for sale. Outer Diameter (rim): 116mm Outer Diameter (shaft): 34mm Inner Diameter (shaft): 22mm Height (shaft): 67mm

Sliding Sheave Bearing $6.93 Sliding Sheave Bearing for 50cc 4-stroke QMB139 engines. Shop our wide assortment of scooter parts , gas scooters , electric scooters , and motorized scooters for sale.

Sliding Sheave Spring $9.91 Sliding Sheave Spring for 50cc 4-stroke QMB139 engines. Shop our wide assortment of scooter parts , gas scooters , electric scooters , and motorized scooters for sale. Overall Length 97 mm Width 57mm

Gunnebo Johnson 323474562016 Sb4S4Bt 4 Inch Sheave Snatchblock WTailboard $177.96 No fitting. Rope Size: 3/8 (Min) 1/2 (Max). Working Load Limit: 4 tons. Wheel Diam: 4 . Length: 73/4 . Width: 1.593 (Min) 43/4 (Max). Thickness: 3.2810 . Pin Size: 3/4 .

Gunnebo Johnson Sb4s4bt 4" Sheave Snatchblock w/Tailboard. Each $155.94 Manufacturer: Gunnebo Johnson. Each. No fitting Rope Size = 3/8 in [Min], 1/2 in [Max] Working Load Limit = 4 tons Wheel Diameter = 4 in Hook Overall Length = 7 3/4 in Width = 1.593 in [Min], 4 3/4 in [Max] Thickness = 3.2810 in Pin Size = 3/4 in Bearing

Gunnebo Johnson 323474492016 Sb4S4Bh 4 Ton Snatch Block Single Sheave $260.09 Rope Size: 3/8 in [Min] 1/2 in [Max]. Working Load Limit: 4 tons. Wheel Diam: 4 in. Hook Opening: 1.437 in. Hook Thickness: 17/8 in. Length: 141/2 in. Width: 43/4 in. Thickness: 3.2810 in. Pin Size: 1 in. Mounting: Hook.

Sliding Sheave Needle Bearing $5.94 Sliding Sheave Needle Bearing for 50cc 4-stroke QMB139 engines. Shop our wide assortment of scooter parts , gas scooters , electric scooters , and motorized scooters for sale. Inner diameter 17 mm Outer diameter 25 mm Width 18 mm

Gunnebo Johnson Sb4s4bh 4 Ton Snatch Block Single Sheave. Each $227.94 Manufacturer: Gunnebo Johnson. Each. Rope Size = 3/8 in [Min], 1/2 in [Max] Working Load Limit = 4 tons Wheel Diameter = 4 in Rim Eye Inner Eye Shackle Inner Hook Opening = 1.437 in Hook Thickness = 1 7/8 in Overall Length = 14 1/2 in Width = 4 3/4 in Th

Johnson 40-6200 Magnetic Sheave Alignment Laser Kit $879.99 Magnetic Sheave Alignment Laser Kit - 40-6200. (3) Precision Machined Magnetic Targets. Hard-Shell Carrying Case

Apex Tool Group Chain 1.50in. Nickel Rigid Eye Double Sheave Pulley T7655222 $24.49 Double sheave pulley. For fiber rope. Rigid eye. Nickel. 1.50 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Apex Tool Group Chain 1.25in. Rigid Eye Single Sheave Pulley T7655120 $23.24 Single sheave pulley. For fiber rope. Rigid eye. Nickel. 1.25 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Apex Tool Group Chain .75in. Nickel Swivel Eye Single Sheave Pulley T7655002 $22.15 Single sheave pulley. For fiber rope. Swivel eye. Nickel.75 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Apex Tool Group Chain .50 in. Rigid Eye Single Sheave Pulley T7655062 $21.78 Single sheave pulley. For fiber rope. Rigid eye. Nickel.50 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Apex Tool Group Chain 1.50in. Nickel Swivel Eye Single Sheave Pulley T7655032 $23.97 Single sheave pulley. For fiber rope. Swivel eye. Nickel. 1.50 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Apex Tool Group Chain .50 in. Nickel Swivel Eye Single Sheave Pulley T7655052 $21.91 Single sheave pulley. For fiber rope. Swivel eye. Nickel.50 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Apex Tool Group Chain 2in. Rigid Eye Single Sheave Pulley T7655142 $24.97 Single sheave pulley. For fiber rope. Rigid eye. Nickel. 2 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Apex Tool Group Chain .75in. Rigid Eye Single Sheave Pulley T7655100 $21.41 Single sheave pulley. For fiber rope. Rigid eye. Nickel.75 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Apex Tool Group Chain 2in. Nickel Swivel Eye Single Sheave Pulley T7655042 $25.52 Single sheave pulley. For fiber rope. Swivel eye. Nickel. 2 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Apex Tool Group Chain .75in. Nickel Rigid Eye Double Sheave Pulley T7655202 $22.49 Double sheave pulley. For fiber rope. Rigid eye. Nickel.75 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Apex Tool Group Chain 1in. Nickel Swivel Eye Single Sheave Pulley T7655012 $22.69 Single sheave pulley. For fiber rope. Swivel eye. Nickel. 1 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Apex Tool Group Chain 1.25in. Nickel Swivel Eye Single Sheave Pulley T7655022 $23.23 Single sheave pulley. For fiber rope. Swivel eye. Nickel. 1.25 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Apex Tool Group Chain 1in. Nickel Rigid Eye Double Sheave Pulley T7655212 $23.43 Double sheave pulley. For fiber rope. Rigid eye. Nickel. 1 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Apex Tool Group Chain 1.50in. Rigid Eye Single Sheave Pulley T7655132 $23.63 Single sheave pulley. For fiber rope. Rigid eye. Nickel. 1.50 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Apex Tool Group Chain 1in. Nickel Swivel Eye Double Sheave Pulley T7655312 $22.26 Double sheave pulley for fiber rope. Swivel eye. Nickel. 1 sheave diameter. Carded. Length: 1. Width: 1. Height: 2

Super Jersey Long Sleeve Crewneck Tee $39.95 "This long sleeve classic tee features size vents and a slight A-line shape for full coverage and easy movement. Made of a heavier weight cotton that never clings and shaped just for the plus size woman."

QuikCool Double-Scoop Bra Top $29.95 "Looking for a plus size bra top that is soft, light and supremely comfortable? QuikCool plus size bra tops are the answer. This dual layer, fully-lined plus size bra, offers light support while the wicking fabric is smooth and sumptuous. It surrounds the body to push moisture away from the skin to keep you dry and comfortable. Wear this plus size style during yoga, under a casual tee, or even sleeping. Cut for a plus size woman, this sporty top can be worn for low-impact activities or casual wear. Tee shirts slide over the smooth fabric. You’ll love the careful Junonia cut. It is longer at the sides for full and flattering fit, and slighter higher front and back for support. The armholes are not too tight, yet have excellent coverage and the wider straps support and can cover a plus size bra for extra support. Antimicrobial and fast-drying, QuikCool dries quickly, and is perfect for travel. "

UV-Protective Stretch Nylon Half-Zip Pullover $19.95 "We designed this versatile plus size pullover to protect you from the sun. It does that beautifully with UPF 50 and the highest possible UV rating. But then we noticed how versatile it is! We cut this plus size jacket long with princess seams to give you a flattering plus size jacket over plus size leggings and even a plus size bathing suit swimsuit on the beach. The arms are cut full for air flow, and roll up with tabs, and it has side slits for easy moving. This womanly plus size jacket also serves as a wind breaker jacket and is a perfect travel companion, ready for any activity, or those casual walks on the beach. Front slit pockets, quarter zip neckline "

Juno Stretch Naturals Leggings $36.95 "Luxurious cotton with spandex for ultimate stretch and comfort. Created with Junonia’s plus size fit and long-lasting quality. Covered elastic no-chafe waist."

Juno Stretch Naturals Capris $36.95 "Luxurious cotton with spandex for ultimate stretch, and comfort. Created with Junonia’s plus size fit and long-lasting quality. Covered elastic no-chafe waist."

Seashell Classic Pique Polo $29.99 "Don’t miss out on this fabulous deal! Nothing beats the crisp appeal of the classic plus size polo. It never goes out of style. Junonia’s womanly cut is also a winner. We’ve kept the plus size shape in mind with a great fit. Active or casual, the longer length means you can wear this shirt over plus size jeans or plus size leggings. Long side slits and a perfectly cut armhole mean you can play, run and laugh with the kids. Best of all is the gorgeous all-cotton pique fabric. It is a medium weight for a smooth no-cling appearance and feels great year around. Durable and breathable 100% Cotton, this shirt washes like a dream. Subtly embroidered with a Junonia seashell at the hem, your guarantee of exceptional fit and quality. If you are between sizes or prefer an oversized tunic fit, we recommend ordering a size up. "

Packable Apple Fit Sport Pant $19.99 "These are a steal! If you love our black cotton plus size stretch pants, (and who doesn’t?) you’ll love having a pair of our best selling plus size pants in this warm and versatile cocoa brown color. Match up these woman-friendly plus size pants with your plus size tops in light blue, mango, and even black! The fabric is smooth with just the right amount of stretch for ease. Toss these in and out of the wash; they just bounce back into shape, keeping you looking your best. They not only look good, but these are incredibly comfortable. We cut these plus size pants full just for the plus size shape with a soft covered elastic waist. The legs and seat on this pant are cut for a slim appeal. Wear these for casual, for walking, and even to active pursuits like yoga class. Cling-free cotton/spandex is durable and just so comfortable. These even have side seam pockets for all our pocket-loving customers! Buy two or you’ll regret it! "

V-Neck Tank Top $19.95 "A versatile and flattering, sleeveless plus size top. In soft lightweight non-cling summer cotton, this knit pullover is just the elegant detail you’ve been looking for. Worn under a jacket for those office meetings, it also looks great over a pair of plus size jeans. This is not really an active top, but would make the perfect travel companion, sauntering over cobblestones and shopping the markets. Add jewelry and scarves for fun. You’ll love the flattering neckline that takes this well above a simple plus size tank. The womanly cut of the armholes is perfect and the length just right. At this price you’ll want one in each color!"

Super Jersey Long Sleeve V-Neck Tee $39.95 "No-cling cotton skims the body for a flattering silhouette. Comfortable and long-lasting top-quality cotton. Wash after wash, from play to casual this plus size v-neck will become a favorite. "

Junowear All-Cotton Classic Brief $12.95 "Our best-selling brief ever! This generous full-cut plus size classic features a comfortable knit elastic waistband and non-chafe stretch edging at the leg. Natural waistline fit with a conservative leg. "

Seashell Crossback Suit with Binding $49.95 "The most flattering plus size athletic tank you’ll ever wear. You’ll love the freedom of the X-back style for swimming. The front inset avoids water scooping when you are powering through the water. The side bust coverage is plus size perfect and the leg conservative but comfy. The back is a little higher for support and coverage, and the wide piped straps are striking. Inside our unique swim bra design, utilizes a special power mesh swim aqua bra system that combines under bust support with around-the-body sport bra construction for a natural but defined bust line. You’ll be amazed at how secure you feel in this plus size suit! We’ve made this plus size swimsuit from our best Nylon/high-spandex fabric with extra chlorine resistance. The thicker fabric offers elegant support and control. Wear for aqua activities, or simply look great lounging on a beach."

UV-Protective Stretch Nylon Zip Jacket $19.95 "Protect yourself from the harmful rays of the sun in this sporty plus size jacket. The fabric is rated at UPF 50 and has the highest possible UV rating. But you’ll be grabbing this versatile plus size jacket on even cloudy days, as a perfect top layer for chilly mornings or cool weather strolls. Pretty details include a stylish mock neck and contrast stitching, a Junonia logo on the two-way zipper pull and elegant shirring at the chest and cuffs. Back vented design allows for easy shoulder movement, while cord locks at the hem let you adjust for warmth and comfort. Cut a little longer to work for all your needs from casual walks to topping a plus size bathing suit swimsuit at the beach. Front slit pockets. This is a perfect plus size travel jacket! "

Juno Stretch Naturals Bike Short $24.95 "Luxurious cotton with spandex for ultimate stretch and comfort. Created with Junonia’s plus size fit and long-lasting quality with longer inseams. Covered elastic no-chafe waist."

Gunnebo Johnson 323474620016 Sb4S6Bs 4 Ton Single Sheave Snatch Block WShack $403.83 Rope Size: 3/8 in [Min] 1/2 in [Max]. Working Load Limit: 4 tons. Wheel Diam: 6 in. Shackle Inner Width: 21/4 in. Length: 161/2 in. Width: 61/4 in. Thickness: 3.2810 in. Pin Size: 1 in.

QuikCool Full-Coverage Brief $19.95 "We dare you to find a more comfortable and sumptuous brief. We have cut this beautiful style for a woman, with full coverage yet with a sleek and slightly sexy appeal. But the secret to this popular style is the fabric. QuikCool is silky soft and stretchy, with the wicking power that makes all the difference. These wicking plus size panties push moisture away from your body keeping you dry and comfortable in all temperatures. Say goodbye to clammy plus size underwear. Junonia has carefully fit these for the plus size shape, and added a double inner gusset and soft, no-chafe bound edges at both the leg and waist. Enjoy the light stretchy support for active and all-day casual wear. Versatile and fast-drying, these briefs are perfect for sport, active and everyday casual wear. Antimicrobial and fast-drying, QuikCool is just the ticket for travel. "