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Tractor Talk Discussion Forum

Threadless Grease Zircs ???

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MMB

07-07-2004 20:25:46




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Taking apart the pedal assemblys today here on an old Case and the grease zircs for the clutch pedal and one of the brake pedals are threadless. The hole is slightly less than 1/4" and the old zircs are a friction fit into those holes. Never saw these types before and I'll check around to see if I can still get them. Otherwise I will drill out the hole a bit and tap a pipe thread and install regular zircs. Anyone ever see these before and are they still a common item or hard to locate?

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1/16-27 NPT

07-08-2004 17:41:58




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 Re: Threadless Grease Zircs ??? in reply to MMB, 07-07-2004 20:25:46  
I think the correct size is 1/16-27 NPT which requires a 15/64 drill or for the larger, 1/8-27 NPT which requires a 21/64 drill. PS: NPT=National Pipe Thread



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Jack

07-08-2004 11:21:06




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 Re: Threadless Grease Zircs ??? in reply to MMB, 07-07-2004 20:25:46  
They were also used by Ford on at least some Model A's. (my '29 has 'em on the front end). I got replacements from an antique autoparts supplier. Don't know why you'd want to use them though. They do pop out, especially when the grease is old and dried. Better choice is to use the 1/4-28 threaded ones suggested in another reply. Of course those do require that you take the assembly apart so you can properly tap the hole.

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Carm

07-08-2004 06:14:15




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 Re: Threadless Grease Zircs ??? in reply to MMB, 07-07-2004 20:25:46  
They are used on our aircraft in some spots. As soon as you pump, they blow out of the hole.



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Ron

07-08-2004 02:14:30




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 Re: Threadless Grease Zircs ??? in reply to MMB, 07-07-2004 20:25:46  
NAPA carries them in all sizes. Very common on tractors.



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Roy in UK

07-07-2004 23:28:48




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 Re: Threadless Grease Zircs ??? in reply to MMB, 07-07-2004 20:25:46  
Claas used to love 'em ( I didn't) but they learned the error of their ways.



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Jake

07-07-2004 22:41:10




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 Re: Threadless Grease Zircs ??? in reply to MMB, 07-07-2004 20:25:46  
Yep, seen those threadless ones 25 years ago by now.
Problem with them is if you get something plugged up and give them the grease pressure, they blow out of the hole.
If you do need to drill and tap to replace them, there are some available with 1/4-28 bolt thread (not pipe thread) so you don't have to drill such a big hole.



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paul

07-07-2004 21:34:52




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 Re: Threadless Grease Zircs ??? in reply to MMB, 07-07-2004 20:25:46  
They are now real common - quicker assembly at the factory. I don't care for them.

--->Paul



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Ray,IN

07-07-2004 20:38:55




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 Re: Threadless Grease Zircs ??? in reply to MMB, 07-07-2004 20:25:46  
They are readily available from farm, automotive, and some hardware stores. I don't remember the proper name for them. They appear to be threaded until closer inspection reveals they have compression rings rather than threads on the end.



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Buzzman72

07-07-2004 20:38:54




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 Re: Threadless Grease Zircs ??? in reply to MMB, 07-07-2004 20:25:46  
Zerks that have a barb, similar to a fitting for a hose, are fairly common...probably moreso in automotive applications than in ag usage. Should be easy to find. Personally, I prefer threads, but sometimes you take what the manufacturer gives you.



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