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300U front wheel bearing torque?

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JayWalt

12-10-2006 10:41:25

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I know on most cars you tighten the spindle nut that holds the bearings in to a specified torque, then you back it off a certain amount. How do I do my 300U? I got the front wheels off to inspect and repack the bearings and would like to re-assemble it properly. I know your supposed to recheck them after a certain amount of driving.
Thanks guys!!

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Randy as in Randy-IA

12-10-2006 18:08:36

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Re: 300U front wheel bearing torque? in reply to JayWalt, 12-10-2006 10:41:25

Basically with a tapered bearing the pre-load is to displace the fresh grease between the race and the rollers . Tighten while rotating the hub , back off and tighten again . Do this a couple times and you'll feel when the bearing's are " set " . Back off one last time and snug it just past loose to the nearest open slot in the castle nut and you should feel what everyone else has been saying about a barely perceptible wiggle in the hub . The wheels / tires should be on the hub when you do all this . And do check it after a couple hours use . It's better a little loose than to tight . Take care and good luck ! ...Randy

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colinNS

12-10-2006 13:21:15

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Re: 300U front wheel bearing torque? in reply to JayWalt, 12-10-2006 10:41:25

The reason wheel bearings aren't pre loaded.....
As the bearings heat up they expand.If you have them tight when they're cool they get even tighter when hot thus causing bearing failure.Like it says above,snug them up good while rotating the wheel then back it off.The nut at this point will be a little better than finger tight. Don't get hung up on the torque,it's a slow speed tractor not the space shuutle!

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JayWalt

12-10-2006 15:55:22

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Re: 300U front wheel bearing torque? in reply to colinNS, 12-10-2006 13:21:15

Slow? This thing rockets off in road gear at a whopping 18 or 22 mph (cant remember offhand). It's alot faster than what is manageable at time, especially around curves... Gotta be careful with it or BANG you'll have a wreck =P

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CNKS

12-10-2006 12:39:31

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Re: 300U front wheel bearing torque? in reply to JayWalt, 12-10-2006 10:41:25

You can use the torque specs if you want, just to be safe. But, in the low speed applications for tractors, just preload it, back off, tighten again and back off the the next slot in the castellated (sp?) nut. Not sure the torque specs would be any better than that. IH was using tapered roller bearings before torque wrenches were in widespread use.

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Fromjb2

12-10-2006 12:08:06

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Re: 300U front wheel bearing torque? in reply to JayWalt, 12-10-2006 10:41:25

Hi Jay, in the I&T shop manual for IH 684 front wheel bearings that are tapered roller bearings, it says: Tighten nut to 70 ft-lbs while rotating wheel, back nut off, then re torque to 50 ft-lbs., back nut off 1/4 turn and install cotter key.

Hope this helps
JB2

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Wardner

12-10-2006 11:15:57

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Re: 300U front wheel bearing torque? in reply to JayWalt, 12-10-2006 10:41:25

Torque and wheel bearing nuts shouldn't be used in the same sentence. There should be a very slight, almost imperceptible, wobble in the hub/wheel/tire assembly. Keep checking it for a few day after running the tractor.

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Allan In NE

12-10-2006 11:46:59

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Re: 300U front wheel bearing torque? in reply to Wardner, 12-10-2006 11:15:57

Hmmmmm , wait a minute.

Depends if they are ball bearings or tapered roller bearings.

Tapered roller bearings should ALWAYS be preloaded.

However, what you say is true for older ball bearing applications.

Allan

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Bob

12-10-2006 12:37:26

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Re: 300U front wheel bearing torque? in reply to Allan In NE, 12-10-2006 11:46:59

Allan,

Wardner has it RIGHT.

Tapered roller front wheel bearings are not commonly pre-loaded, nor are tapered roller bearings used on the rear wheels of pickups or trucks.

If you have it jacked up, and wiggle the wheel around, there needs to be a tiny amount of play.

If the hubcap is off, and you listen closely, you can hear a little noise from the grease tearing loose as the bearings wiggle.

Following the "torque and loosen" procedure, as posted by "Fromjb2" sets the bearings up with that tiny amount of free play.

Of course, transmission and differential tapered roller bearings are another matter, and get pre-laded.

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