Rear Wheel Valve Stem Question

   / Rear Wheel Valve Stem Question #1  

KennK

Silver Member
Joined
May 11, 2006
Messages
224
Location
NE Wisconsin
Tractor
John Deere 3320
Yesterday I went to add air to my John Deere 3320 tractor tires - starting with the rears - which have all metal stems and caps. I've done this plenty of times with now issues.

This time when I went to unscrew the valve cap instead of just the cap unscrewing the stem unscrewed - maybe the top 1/2" or 3/4" of the nipple, and air came pouring out. Luckily I didn't have it fully unscrewed so I quickly screwed it back in and was able to remove the valve cap while holding the stem in place.

I've never seen that in a tire stem and it shocked the heck out of me.

Question: Is this two-part valve stem how the whiles get filled with fluid??? Is there a rubber o-ring in there somewhere to prevent air leakage? Of course I don't want to take it off to look at it.

The small front tires have a regular valve stem - like on my truck.

This has been a REALLY cold winter. In years past I've not worried about temperature changes impacting the wheel pressure too much, but this year the tire pressure was really down.
 
   / Rear Wheel Valve Stem Question #2  
yes it has a o-ring, you can add water with that type valve
 
   / Rear Wheel Valve Stem Question #3  
rear 2 part stems are common.
 
   / Rear Wheel Valve Stem Question #4  
Snug up the part that came loose pretty good with pliers. Don't over do it just good and snug. Then you shouldn't have the problem next time.
 

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