W
wle
Guest
i cannot keep a frame pump working.
this is about my 6th one, most were returned to the lbs.
usually you don;t know til you are trying to fix a flat.
i seem to get about 3 fixes out of each pump..
latest problem [which i have had before]:
pump is a topeak speedblaster.
not a mini.
anyway, what it does is this:
it seems to pump fine,
or rather, it would, if it would take in any air.
when you pull the handle out, it wants to
to spring back into the pump, because it doesn;t draw any air in.
it will - if you wait about 5 seconds between strokes, but
with 150 strokes required to go to decent pressure, that is a problem.
in trying to fix it, i did the following tests.
pour water into pump barrel
it goes out the tire end just fine, so there is no obstruction there
remove the o ring on the piston.
strangely, the problem persists
the piston fits securely enough that it can still
not get any air in
it even seems to be able to pump somewhat
oil the o ring [after replacing it]
no change
so where does the one-way action happen?
you would think the o ring would do that//
//and with no o ring, it
a. couldn;t pump at all but
b. could draw air in just fine.
what the hell is going on?
how complicated can these things be?
is there some micro hole in the piston that is clogged?
wle.
this is about my 6th one, most were returned to the lbs.
usually you don;t know til you are trying to fix a flat.
i seem to get about 3 fixes out of each pump..
latest problem [which i have had before]:
pump is a topeak speedblaster.
not a mini.
anyway, what it does is this:
it seems to pump fine,
or rather, it would, if it would take in any air.
when you pull the handle out, it wants to
to spring back into the pump, because it doesn;t draw any air in.
it will - if you wait about 5 seconds between strokes, but
with 150 strokes required to go to decent pressure, that is a problem.
in trying to fix it, i did the following tests.
pour water into pump barrel
it goes out the tire end just fine, so there is no obstruction there
remove the o ring on the piston.
strangely, the problem persists
the piston fits securely enough that it can still
not get any air in
it even seems to be able to pump somewhat
oil the o ring [after replacing it]
no change
so where does the one-way action happen?
you would think the o ring would do that//
//and with no o ring, it
a. couldn;t pump at all but
b. could draw air in just fine.
what the hell is going on?
how complicated can these things be?
is there some micro hole in the piston that is clogged?
wle.