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Old 02-25-06, 04:23 AM   #1
cs1
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Zefal pump disassembly

Did a search and couldn't come up with anything. I'm looking to paint an old Zefal frame pump hpx and need a little help on disassembly. Any diagrams or instructions out there?

Tim
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Old 02-25-06, 12:25 PM   #2
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At the pump handle end, you have a black or silver threaded piece that holds the shaft into the body. Under that, I believe you have a long spring. At the valve stem insertion end: First a large black or silver approx. 1/2 wide medal threaded cap. Under that,if you are set up for presta , there is a black rubber 1/2 " thick spacer, followed by a short spring and washer. Schraeder is the black rubber spacer, a small black cone shaped spacer , than the spring and washer. Not sure if the lever comes out, but if it does there should be a small threaded nut on the end holding it in. Best thing to do, obviously, is to disassemble everything in order , and draw a picture of all as you take it out. I may not be 100% on this, but I hope that this wll help.
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Old 02-25-06, 05:39 PM   #3
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Quote:
Originally Posted by jacksbike
At the pump handle end, you have a black or silver threaded piece that holds the shaft into the body. Under that, I believe you have a long spring. At the valve stem insertion end: First a large black or silver approx. 1/2 wide medal threaded cap. Under that,if you are set up for presta , there is a black rubber 1/2 " thick spacer, followed by a short spring and washer. Schraeder is the black rubber spacer, a small black cone shaped spacer , than the spring and washer. Not sure if the lever comes out, but if it does there should be a small threaded nut on the end holding it in. Best thing to do, obviously, is to disassemble everything in order , and draw a picture of all as you take it out. I may not be 100% on this, but I hope that this wll help.
I've figured out the black plastice part on the main body. I was wondering how to get the pump head off the other end of the main body. It looks like a screwdrive would do but it would have to be 14"-16+ long to fit into the body.


Tim
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Old 11-22-15, 11:57 PM   #4
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I've figured out the black plastice part on the main body. I was wondering how to get the pump head off the other end of the main body. It looks like a screwdrive would do but it would have to be 14"-16+ long to fit into the body.


Tim
Yes, a long screwdriver or a 1/4 in ratchet, extensions, and flat blade screwdriver head. You could make one out of a rod with a flatted/filed end.

Anyone know how to disasseble the handle end of the HPx?
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Old 11-23-15, 01:08 AM   #5
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Yes, a long screwdriver or a 1/4 in ratchet, extensions, and flat blade screwdriver head. You could make one out of a rod with a flatted/filed end.

Anyone know how to disasseble the handle end of the HPx?
You are late to the party @jtdehait@qwest. But thanks for getting back. I just want take it apart to paint it.

Last edited by cs1; 11-23-15 at 04:37 AM.
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Old 11-23-15, 06:04 AM   #6
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You've had 9 years to work on it. Any luck ?
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Old 11-23-15, 09:02 AM   #7
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So, do you know how to disassemble the handle of an HPX?
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Old 11-23-15, 09:03 AM   #8
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You've had 9 years to work on it. Any luck ?
So, do you know how to disassemble the handle of an HPX?
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Old 11-23-15, 10:09 AM   #9
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The last time I saw my HPX it was about to go under a truck tire. I had to cover my eyes. Good bye old friend.
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Old 11-23-15, 12:04 PM   #10
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The last time I saw my HPX it was about to go under a truck tire. I had to cover my eyes. Good bye old friend.
Do you still have the pieces? Could you take a look at the handle and see how it comes apart?
Thanks
Jack
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Old 11-23-15, 12:24 PM   #11
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handles are on the plunger there is a threaded ring to remove the plunger.. from the barrel

as I recall the handles were fixed to the plunger in the factory while it was manufactured ..

though the last one I've seen was 25 years ago so memory has faded some..
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Old 11-23-15, 01:25 PM   #12
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I too would like to be able to take the handle end apart because one of my HPXs and my new Classic both have handles that rattle on less than perfectly smooth roads, sounding just like loose headsets. Or maybe someone here knows how to stop that rattle.

I make the rattle a little better by reducing the vibration transmitted. Both pumps are mounted on brazed on headtube pegs. I cut a say 10" x 3/4" strip of inner tube and stretch the strip over the pum end, holding the handle and stretch strip with my left hand as I put a 1" wide tight fitting innertube ring over the last inch of the handle. Last, I cut the stretched strip with scissors and let it slide back out of sight under the ring. With black pump handles, you don't even see the innertube and it makes the mount much more secure and quieter.

Now if I could just get the pump itself to shut up!

Ben
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Old 11-23-15, 01:55 PM   #13
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Pour in epoxy? use a padded pump strap or 2 to secure the pump to the frame..

I use a twofish strap to keep my Silca Impero from falling off ..

add some inner tube sourced tubing over the pump , that will slide off easily when you need a pump to pump.
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Old 11-23-15, 02:20 PM   #14
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Do you still have the pieces? Could you take a look at the handle and see how it comes apart?
Thanks
Jack
Sorry it was a few years ago, and I was not going into traffic to retrieve the, very flat, remains.
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Old 11-23-15, 04:33 PM   #15
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I just looked at my Zefal HPX and i see 2 notches on the inside of the pump handle. i don't know if that unscrews (I think it does) or if it's a press fit.

Do you really need to take it apart (and risk breaking something) just to paint it/

Cheers
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Old 11-23-15, 11:49 PM   #16
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I just looked at my Zefal HPX and i see 2 notches on the inside of the pump handle. i don't know if that unscrews (I think it does) or if it's a press fit.

Do you really need to take it apart (and risk breaking something) just to paint it/

Cheers
The two notches inside the handle don't seem to allow it to unscrew. The plastic pieces inside the handle are split in two, so they may be a press or snap fit. As you say, I don't want to break it, so I'm looking for someone who has disassembled it or has a broken one to inspect.

I'm in the process of turning a #4 into a #3 length - in polished Al. I have the option of shortening the inner rod at the seal end, or inside the handle. Inside the handle would be neater, and give me the option of dampening the vibrations of internal parts to stop the rattles.

Removing the pump head was easy with a homemade long screwdriver made from a 3/8 rod with the end ground down. The front grip removes easily with GooGone dribbled into it. It softens the glue (after about an hour), allowing it to be pulled off.

Next up is shortening the barrel, but saving the rounded end and hex hole, and machining a sleve plug with the same internal volume as the rounded end (wich sets the max pressure it will reach). Then it gets JB Welded together. Sounds like a lot of work for a $40 pump, but the engineering challenge is where the fun is.
Jack
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Old 11-25-15, 04:54 AM   #17
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You've had 9 years to work on it. Any luck ?
LOL, don't feel much smarter!
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