How To Measure Trailer Axle Bearings

You will need to safely support the trailer, remove the wheel and tire, remove the grease cap, remove the cotter pin and washer that secures the spindle nut, remove the spindle nut, and then you will be able to remove the hub from your trailer. Look at the number on the tape measure where it touches the inside of the spring where you are standing.

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If the spring is on top of the axle, it is an over slung mount (also known as a reverse axle).

How to measure trailer axle bearings. Remove the wheel and tire, remove the grease cap, remove the cotter pin and washer that secure the spindle nut. Identifying your correct bearing combination of inner and outer bearings is important when buying new axles, hubs or replacing the bearings itself to ensure you buy the right combination. Note also the brand of the axle and the atm of the trailer before asking your distributor for replacements.

Loosen the lug nuts and remove the wheel from the trailer. The most important thing to do when replacing a trailer axle is to examine how the old trailer was mounted. Selecting the right kind of hub and spindle for your trailers gross loaded weight is relatively straight forward although care needs to be taken to get the best possible quality for all the components from the spindle steel type, and quality cast hubs, through to branded bearings, marine grade seals and quality.

This is your spring center measurement. This is the primary measurement that is needed. Shop our range of hub drums

Boat trailer axle kits include several different individual trailer parts. Any parts that have to do with your trailer's axle can be found here. With standard bearings, the inner bearing is larger than the outer, but with parallel bearings they're the same size.

Hub face (hf) and spring centers (sc) are what we use to determine your axle width and placement. A more precise measurement can be made by measuring the distance from one 'hub face' to the other. Shop our range of lazy hubs.

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In straight axles, you measure from the spindle centerline and axle main beam center line. Some of the common bearing combinations are listed below, but please be aware that different applications may have other bearing numbers and combinations that are not shown in this table. Here’s a the quick guide to understanding trailer axles and how they measure up when building a trailer.

Identify inner and outer bearing. Trailer axle parts and materials. How to order an axle.

Visit our general discussion blog to learn more about trailer parts and how you can find the right options in our online catalog. Axles (including the wheels and tires) have several key bits of defining information. Trailer wheel bearings are specific to the spindle that is installed on the axle that is on your trailer.

Let's refer to this chart: Measurement # 1 = axle track. If it has the spring mounted below the axle, it is called an under slung mount.

Be careful not to measure to the inside of the hub, only the outside. They’re not complicated, but fitting the trailer is a little more than picking a coffee mug to fit your personality. How to measure a trailer axle.

1.select your axle based on the current style you currently have on your trailer. Trailer wheel bearings are specific to the spindle that is installed on the axle on your trailer. Measurement # 2 = spring center.

How to measure your trailer axle. You will need to safely support the trailer, remove the following items in this order, keeping track of where and how they came apart. Measure your axle track length by determining the distance between the center of one tire to the center of the other tire.

How to measure an axle. Let the trailer parts outlet help you today! Sl (slimline or ford) bearings are rated for 1500 kg on a 45 mm round or square axle.

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It is the second measurement you need to know to buy the right size of axle for your trailer. When you go looking for replacement trailer bearings, you’ll possibly end Trailer axle spring center is the distance between the center of one spring to the center of the other.

(generally adding 2” to the spring center measurement can determine the frame width.) also check out the common axles sizes. Pull the wheel off of the rod toward your body and put it off to the side, too. The load rating of the axle must support the maximum gross vehicle weight rating.

You want an axle that is similar to the one currently under the trailer to avoid any problems with clearance. Measure across the axle to the exact same spot on the opposite side. The measurement from the face of one hub to the face of the other.

Trailer axles — the specifications. Remember that axles are usually measured in inches. The most integral parts of your boat trailers running gear would be the boat trailer axle, and the trailer hubs.

Bearings have the number stamped into them or you can measure them with verniers. The axle will either have brakes (braking axle), or no brakes (idler axle). This category contains all the needed components for you to put together your ideal trailer axle kit to get your boat back in the water.

Lm (holden bearings) are rated for 750 kg on a 39 mm round or 40 mm square axle. (the face is where the wheel sits against the hub.) the measurement from the center of one spring pad to center of the other. Use a wrench or a tire iron to remove the lug nuts and set them off to the side somewhere safe.

For multiple axle trailers divide the gvw by the number of axles to determine the minimum load capacity of each axle. Read our article on bearing identification for details. In either case, the hub face (hf) measurement is measured to the same place, the outside face of the hub that holds the tires on.

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To obtain the hub face measurement, first hook your tape measure to outside art of hub, that is the part of the hub that is facing the wheel. The easiest way to determine which bearings are used on your trailer axle is to take the hub off and check for the numbers stamped into the bearings. Page 2, axles, hubs, bearings and spindles.

Measure the pcd (pitch circle diameter). If the bearing numbers cannot be read, the next best solution is to find the bearings' inner diameter. Trailer axle drop is the distance from the centerline of spindle to bottom of the main axle tube.

Also, keep in mind that when replacing your trailers axle, this would be the time to get a fresh and new galvanized trailer hub or trailer bearing kit to have a fresh hub or set of bearings to mount to your new trailer axle. Therefore, there is no drop. The diagram below illustrates how to do this on 4, 5 and 6 stud hubs.

Axle measurements helpful for determining proper replacement:

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