Re: Wheel Bearing Pre-load Reply #25 – July 25, 2019, 12:50:28 pm Quote from: bbeane – July 25, 2019, 09:23:33 amJust my observation every tapered roller bearing I ever messed with ( hd transmission, differentials, etc.) have a preload on them. As far as all the lawyer/liability talk, I would like to see one documented case on based on wheel bearing installation. JMHO, by the time there is a wheel off incident there is hardly a way to prove preload or not. I used to re-build drilling spindles with tapered roller bearings, and if you don't correctly pre-load the tapered roller stem bearings on a motorcycle you will have an interesting riding experience. Quote Selected 2 Likes
Re: Wheel Bearing Pre-load Reply #26 – July 26, 2019, 09:37:12 pm I spoke to a rep from Meritor today who referred me to a rep at Truck-Pro who is a retailer for the "Pre-load Dr." tool. I learned that each tool is made specific to each spindle manufacturer and their catalog has a long list of them listed by part number. I have IFS and calculate a high probability that mine is not like any of yours and would require a different tool. So Chuck's idea of purchase sharing a tool is a great idea but won't work in this instance. I was again referred to the service manager at Truck-Pro who is out till Tuesday of next week. I hope to learn that they can precision adjust the front wheel bearings to the desired spec. Their shop is less than 25 miles from me so it should be an easy trip and hopefully not too costly.More as I learn it... Quote Selected
Re: Wheel Bearing Pre-load Reply #27 – July 26, 2019, 10:59:50 pm I doubt they will preload it. Quote Selected
Re: Wheel Bearing Pre-load Reply #28 – July 27, 2019, 12:31:35 pm Spin the tire by hand, snug the nut by hand, add 2-4 degrees of additional nut turn preload, or less than 20#. Thats what I use on these spindles as does the HD truck shop across the street. Q Quote Selected 1 Likes
Re: Wheel Bearing Pre-load Reply #29 – July 27, 2019, 04:41:21 pm I mark the nut as run before adjustment. The square tube thing is my wrench . Quote Selected
Re: Wheel Bearing Pre-load Reply #30 – July 30, 2019, 04:31:16 pm Quote from: Dave Dunington – July 20, 2019, 12:36:10 amThe procedure is to tighten the wheel while spinning the wheel. . A firm pressure on the wrench, then back the nut off , till the cotter pin fits. That's how mine where done. I like this method since the bearing tells you how tight they want to be. see yaken Quote Selected 1 Likes
Re: Wheel Bearing Pre-load Reply #31 – July 30, 2019, 09:13:36 pm I'm supremely confident that I can make this adjustment. I've replaced bearings on boat and utility trailers with no problem. This is a much bigger deal and I Just don't want to get 1000 miles from home to find out I got it wrong. Thanks for all of the comments and advise. Quote Selected 1 Likes
Re: Wheel Bearing Pre-load Reply #32 – July 31, 2019, 10:13:36 am Light duty trailers are greased and require some end play. The oil bath HD tapered bearings run with zero end play minus a little . Not the same. Quote Selected 1 Likes
Re: Wheel Bearing Pre-load Reply #33 – November 24, 2019, 08:32:49 pm All TAPERED bearings require preload, the load is carried by the whole brearing. The older ball bearings ie older Chev cars just need to be snug, they are ball bearings and roll . Torrenting bearings are a different breed of cat.Safe TravelsDave Quote Selected 4 Likes
Re: Wheel Bearing Pre-load Reply #34 – December 05, 2019, 04:47:40 pm Yes preload can be difficult to accurately attain. Probly the main reason the manufacture stays away from preload is that your at .001" preload your at the best possible state. At .002" preload you have dropped to 60% of rated life down from the peak of rated life. At a loose end play of zero you have dropped gone to 115% rated life. At a loose end play of .001" you have dropped 110% rated lifeAt a loose end play of .002" you have dropped down to 97% rated lifeAt a loose end play of .008 you finally drop down to 50% rated life From peak life one thousandth tight drops you to 60% rated lifeFrom peak life nine thousandth loose to reach 50% rated lifeLoose is critically better than too tight by one thousandth.Also no one has mentioned the fact that your adjustment is made with two nuts. There IS free play between the nut and the axle threads and once the first nut is installed, the locking washer is placed and the second nut is torqued against it pushing it to a unknown preload value. This is resolved with the single axle nut and lock ring . That being said every day I change wheels with a preload torque of 150 foot pounds, difference is there not being used to drive too there destination, just a little use at the start and end of every trip.Scott Quote Selected
Re: Wheel Bearing Pre-load Reply #35 – December 05, 2019, 11:45:51 pm It will be interesting if after all this effort to nail down the proper setup for get the wheel bearings right. Will this fix the slight wander at speed? Bill Quote Selected 2 Likes
Re: Wheel Bearing Pre-load Reply #36 – December 06, 2019, 12:36:44 am dsd your info matches my experience. Mine are set at .001 and .003 and a very slight dead spot is present.No wander. Quote Selected
Re: Wheel Bearing Pre-load Reply #37 – December 06, 2019, 10:15:59 am Caflashbob. The point I was trying to make is a little too tight is critical and a little loose is no big deal. I've always tried for the -.001 but am always aware too much is unacceptable. Truly reduces wander IMO. I've always keep in mind preload run up from the locking nut and adjusted to offset for it.Scott Quote Selected
Re: Wheel Bearing Pre-load Reply #38 – December 06, 2019, 10:59:30 am Fact of the matter is, it is VERY difficult to achieve a dead nuts accurate to+or- .001-3 tolerance in something like a large tapered wheel bearing. Especially the -.001-3 which is called preload with the equipment most shops have on hand. Example of preload when doing things like pinion bearings and carrier bearings the preload is measured in inch/ foot lbs of torque to make it turn, as specified in the appropriate service manual .It's not rocket science any good truck shop can do it. Don't stress over it. Just my 2 cents s worth. Quote Selected
Re: Wheel Bearing Pre-load Reply #39 – December 06, 2019, 12:06:38 pm My Cummins dealer will only adjust the wheel bearings to the legally defensible.001-.005 loose setting. Quote Selected
Re: Wheel Bearing Pre-load Reply #40 – January 18, 2020, 03:40:37 pm I preload. The bearings will last longer, in theory, with some preload. And the allowable preload is actually more than the posts in this thread make it out to be. It's not super duper sensitive that 0.001" preload is all that is allowed....even from the chart shown in previous posts it's more like 0.003 or more. Here's two posts I made in the past with actual engineering information from bearing manufacturers. Preload will increase reliability. I also use the "pro-torque" nuts.Wheel seal--Stemcofront wheel bearing preload? Quote Selected 1 Likes
Re: Wheel Bearing Pre-load Reply #41 – January 18, 2020, 04:19:28 pm I always preload bearings. When I was taking my apprenticeship as a heavy duty mechanic I was working on a off highway loggingtruck doing the preload and the boss said to tighten it as tight as you can with 6 ft of pipe. I said isn't that too tight. His answerwas we don't have wheel bearing failures. I don't do it as tight as I can but I do have preload. I always use a Molly Grease. Quote Selected
Re: Wheel Bearing Pre-load Reply #42 – January 18, 2020, 04:34:33 pm Old guy, off highway slow turning wheel bearings are not the same as truck ( MH ) bearings turning at 50 to 70 or more MPH . You over tighten a MH wheel bearing you will be lucky to get 1000 miles out of itJust my 2centsChris Quote Selected 2 Likes
Re: Wheel Bearing Pre-load Reply #43 – January 18, 2020, 04:39:16 pm Quote from: oldguy – January 18, 2020, 04:19:28 pmI always preload bearings. When I was taking my apprenticeship as a heavy duty mechanic I was working on a off highway loggingtruck doing the preload and the boss said to tighten it as tight as you can with 6 ft of pipe. I said isn't that too tight. His answerwas we don't have wheel bearing failures. I don't do it as tight as I can but I do have preload. I always use a Molly Grease.WOW.If you only weight 150 pounds and just hang (no muscle) at end of 6' pipe, that is 900 ft-lbs.Even a 100 pound weakling= 600 ft- lbs.Not on my watch. Quote Selected
Re: Wheel Bearing Pre-load Reply #44 – January 18, 2020, 04:56:47 pm Yes I know it sounds crazy but that's what they did and the only time I had to replace a wheel bearing was when the cage wore outwhich meant it had been used for a long time. I don't do wheel bearings like that any more. Quote Selected
Re: Wheel Bearing Pre-load Reply #45 – January 18, 2020, 05:05:35 pm Yes heavy Equipment traveling slow speeds require higher preload. Daily I install wheels rated at 40k lbs each at final preload of 150+ foot pounds. Have for years. Difference is they only spin the wheels for ten minutes at a time. IE; were not driving there. They do see 120+ mph, but only for seconds. Very little excessive preload on a continuous duty wheel bearings will cause failure. Lots of play will too. Sweet spot is difficult to duplicate, and prove in court. And yes 150+ is way excess for road applications. IMOScott Quote Selected
Topic: Wheel Bearing Pre-load