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Repair Joe Blow pump?

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Old 07-09-18, 11:09 AM
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JeffOYB
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Repair Joe Blow pump? (Fixed! Chuttering and base leak.)

I like my Joe Blow. Been using for years. I worked on it some years ago. Forget its innards. Been working great til yesterday.

It just started not clearing air -- the pump springs back up. Gauge reads the new pressure while pumping but bounces back to zero every stroke. Odd thing happens when I re-levered the chuck's grip on the valve stem: air slowly escaped the pump w a chuddering sound.

I took off the top and the stroke-rod and gasket were grunged up so I cleaned them and greased w vaseline. ...Same problem.

Removed the foot stand and took apart the lower end. Seemed straight forward. Un-did the swiveling hose attachment. Took off the gauge. Everything went easy. Didn't see much dirt anywhere. A little sand came out when I took of the foot stand. I re-assembled everything.

Now ZERO pumping ability. Air escaping the base area. I suspect I put something back together in the wrong orientation. Took it apart again. Can't see where I went wrong. No schematic online that I can find. No detailed repair info. (I did find one pitiful flame war here.) I did find a Youtube video where a guy had my same "chuttering" problem and fixed it by lubing the gasket. But no help for lower air loss.

Help?

UPDATE: I fixed my problem. I'll add a couple notes here in case they help someone. Really, I think they could. There are TWO major angles where you can go wrong in attempting dis/re-assembly using the "obvious" method.

The yellow model pump that I have is about 10 years old. If you disassemble the gauge area there is a small o-ring b/w the gauge and the main pump barrel. ...It goes to nothing that I can see. But a grey "sprout" from the plastic grey upper gauge "cap" fits into the socket sealed by this o-ring. Maybe it serves a key function somehow. Anyway, make sure this o-ring is properly in its recess. I'm not sure if mine was at first.

The main way any tinkering could go wrong is there is a small o-ring at the bottom of the black plastic stand fitting that the main yellow pump barrel fits into. There is only a slight recess for it. It can easily get nudged off center. I think it was just banging around in the bottom of the fitting for awhile until I noticed it was there. I finally noticed it on my second try. In the end, to re-assemble I turned the pump upside down and set the tiny o-ring over its air hole then I carefully put the black base fitting on over it w the 3 allen-bolt holes in their correct orientation. Then I put the metal foot-stand back in place over that. Then re-installed the bolts. And everything was fine. Needless to say, if you disassemble and let that o-ring get away there is no more air seal and your hopes are gone.

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Old 07-09-18, 01:56 PM
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DiabloScott
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I had a similar issue.Appeared to be the check valve was sticking open so there air would go in and then come right back out.
Took it apart and cleaned everything - worked for a couple days and crapped out again. It was a fine pump, I got my money's worth... no regrets.





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Old 07-10-18, 01:06 PM
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Jax Rhapsody
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After the third Joe Blow, I wrote them off.
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Old 07-10-18, 01:19 PM
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ksryder
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Originally Posted by Jax Rhapsody View Post
After the third Joe Blow, I wrote them off.
Same. The Specialized Air Tool that replaced it has been superior in every respect.
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Old 07-11-18, 02:50 PM
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Jax Rhapsody
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Originally Posted by ksryder View Post
Same. The Specialized Air Tool that replaced it has been superior in every respect.
I bought a nice pump for 70$ that had no problems with road bike tubes. I also have a nice floor use minipump, because at the time; trying to pump 90 psi in to a 120psi tire with a mini hand pump... no sir.
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