halftrack rear idler seal question

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steveo916
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halftrack rear idler seal question

Post by steveo916 » Sat Dec 11, 2010 8:31 pm

i have been working on finding a seal for the rear idler on the halftrack. so far i haven't had any luck finding a modern seal for it. the original has the sealing lip facing out so that excess grease can pass the seal. this seems like it would be messy. i think im going to try using a regular oil seal and fill it with oil, my trailer has oil bath hubs so i don't see why this would be a problem. has anyone tried something like this?
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pintelhook11over
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Re: halftrack rear idler seal question

Post by pintelhook11over » Sat Dec 11, 2010 10:12 pm

Hello, If that was the way the seal was originally facing... I think it is a satisfactory position, there are many applications of heavy equipment that use this type of seal configuration. If there is a grease zerk at that lube/ pivot point, the seal allows the grease to "flush" out dirt and prevent internal pressure when you use a pneumatic grease gun to lube the dozens of lube points on a machine in the down time/lube and fuel servicing. Although I don't service Half-tracks everyday, this way is not as "clean", but machines never usually are...at least the ones that work and operate regularly.

Although it can be very messy if it is over-lubricated. I like a little too much grease vs. damaged bearings and shafts...thats what a pressure washer and lower ranking troopers are for!
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Re: halftrack rear idler seal question

Post by steveo916 » Sat Dec 11, 2010 11:21 pm

thanks for the reply pintlehook
i have also seen alot of equipment using these type of grease seals for pivot points. this is the rear idler which is more like a trailer axle hub, i don't remember seeing them use this seal type in that application in modern equipment . i think the main problem is i cant (so far) find the modern equivalent for the original seal which has given me the idea for using an oil seal. is there any disadvantages to using oil? i guess i would have to make sure someone didnt try and add grease at the grease zert and blow out the seal :o
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pintelhook11over
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Re: halftrack rear idler seal question

Post by pintelhook11over » Sun Dec 12, 2010 8:55 am

I don't know if you tried any seal/bearing vendors like Kaman bearing, Applied bearing (they bought out King bearing), Thompson industrial bearing...those are the type of retailers I would try for a "civilian" part, if you have the Inner dia., outer dia., and width those types of guy usually have thousands of options. Also, the Half-track type individuals like Halftrack parts specialists in the various Military vehicle magazines.

On larger Cat dozers the grease seals on front Equalizer bar undercarrage pins are solid yellow neoprene w/a knife edge like a oil seal, these seals have a "wet" grease lube environment, when they are installed they "Undercarrage" guys fixing the stuff, they install a new seal but they drill aprox. four 1/8 holes into the side of the seal faces to allow some of the "pressure" out and it isn't as messy and prevents grease seal pressure "pop" out...

I was wondering,have you disassembled the idler? Or are you getting your "ducks in a row" before disassembly? Next time I am near a Half-track I will look at the rear idlers for a better understanding of what you are dealing with unless you can post some photos of your idlers. Good luck!
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Re: halftrack rear idler seal question

Post by steveo916 » Sun Dec 12, 2010 9:35 pm

i have tried motionindustries.com their website lets you list the size of the seal and searches many of the major seal manufacturers. they do have a oil seal that will work that is 1/2" thick as compared to the original 7/8 thick. the drilling holes idea is interesting i may do that. i was able to find one of the old seals with a CR part number (which is now owned by SKF) but they have no listing of it. SKF is doing some research on it though, they didnt believe i had the number right until i sent them a pic. SKF has been very helpful. i avoid buying the old nos seals that some people sell because i have had problems with them and also i am getting all these relevant numbers together and listing them on my website http://www.halftrackinfo.com" onclick="window.open(this.href);return false; i have 3 m16A2 halftracks torn down to the frame now and as soon as i get one more im going to start putting them back together so im trying to get ready with all this info. i will check the seal sources you listed.
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