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Repairing a pump seal

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Hugh2
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Repairing a pump seal

Postby Hugh2 » Sat May 26, 2018 11:35 pm

My Naish pump started sticking. This is the modern kind that is a little taller than the original size, but not the monster kind. I like it a lot as it has a gauge built into the handle, and is the right height for me, plus the handles are more comfortable. Anyway, the seal in the twist off/on cap around the shaft failed and started sticking. This pump design is used by many companies today, so this failure is surely nothing unusual. Local Naish shop said a pump is a "consumable", just buy a new one. No way to replace the seal even if you could buy one, which has a complicated shape, anyway, as the handle and the main seal unit at the other end are glued on tight. But fortunately the seal is held in place by a white plastic ring held down with two small Phillips screws. So, I removed the seal and replaced with two O-rings, cut once each and with the cuts on opposite sides from each other, kind of how rings on pistons work. Now the pump works well on the downstroke, and about half well on the upstroke, but at least it works.

unclebill
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Re: Repairing a pump seal

Postby unclebill » Sun May 27, 2018 5:45 am

Great job. Like you I hate this idea of scrapping something that is still 99% good just because one small cheap part is worn out and broken. And you have got me thinking to look inside my pumps with the idea of maybe modding them to pump on the down strokes only. I find the push down is very little effort compared to the up pull and would be happy to have them or maybe one work that way.

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cglazier
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Re: Repairing a pump seal

Postby cglazier » Sun May 27, 2018 5:49 am

You can extend the life of any pump greatly by occasionally lubricating the shaft. Avoid petroleum based lubricants like oil because they may react with the O ring. You can buy silicon spray lubricant at automotive or hardware stores.

:wink: CG

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BillyGoatGruff
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Re: Repairing a pump seal

Postby BillyGoatGruff » Sun May 27, 2018 8:57 am

give all pumps an occasional clean and relube with silicone grease, it does not react with rubber and will make the pump last much longer. My latest blade pump has sponge in the inlet valve to stop sand getting in the shaft, which is a good design.

dylan*
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Re: Repairing a pump seal

Postby dylan* » Sun May 27, 2018 1:33 pm

but for real you can get those pumps for $7 on amazon right now

unclebill
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Re: Repairing a pump seal

Postby unclebill » Sun May 27, 2018 10:46 pm

dylan* wrote:
Sun May 27, 2018 1:33 pm
but for real you can get those pumps for $7 on amazon right now
Got a link to those? I searched amazon but could only find regular prices

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WMFG
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Re: Repairing a pump seal

Postby WMFG » Sun May 27, 2018 11:56 pm

Hugh2 wrote:
Sat May 26, 2018 11:35 pm
My Naish pump started sticking. This is the modern kind that is a little taller than the original size, but not the monster kind. I like it a lot as it has a gauge built into the handle, and is the right height for me, plus the handles are more comfortable. Anyway, the seal in the twist off/on cap around the shaft failed and started sticking. This pump design is used by many companies today, so this failure is surely nothing unusual. Local Naish shop said a pump is a "consumable", just buy a new one. No way to replace the seal even if you could buy one, which has a complicated shape, anyway, as the handle and the main seal unit at the other end are glued on tight. But fortunately the seal is held in place by a white plastic ring held down with two small Phillips screws. So, I removed the seal and replaced with two O-rings, cut once each and with the cuts on opposite sides from each other, kind of how rings on pistons work. Now the pump works well on the downstroke, and about half well on the upstroke, but at least it works.
I have the part in stock in USA.

email info@wmfg.co

Hugh2
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Posts: 293
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Local Beach: Central Illinois
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Style: allsorts
Gear: Best Cabo 6, Naish Pivot 7 and 9, Cabrinha Vector 12, Best Bularoo 16m
Long Ocean 136 and 140, Cyclone 150, Cape Doctor "hybrid", Fone Surf 5'11", Naish Global 6'0"
Brand Affiliation: None

Re: Repairing a pump seal

Postby Hugh2 » Mon May 28, 2018 4:06 pm

Thanks WMFG! But how does one replace it without slicing that seal. Does the handle or the main pump seal at the other end come off the shaft somehow?

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WMFG
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Re: Repairing a pump seal

Postby WMFG » Mon May 28, 2018 5:14 pm

Hugh2 wrote:
Mon May 28, 2018 4:06 pm
Thanks WMFG! But how does one replace it without slicing that seal. Does the handle or the main pump seal at the other end come off the shaft somehow?
Remove the lid of the pump and pull the plunger out. Unscrew the handle and you'll have access to the top seal.

You need to be a bit careful not to damage the main seal on the plunger (inside the pump canister). If you're taking the pump apart and it's apparently a well used pump you can clean and re-lubricate the pump. Lithium grease is the lubricant used by the manufacturer.

Hugh2
Frequent Poster
Posts: 293
Joined: Tue Oct 30, 2012 3:38 am
Kiting since: 2005
Local Beach: Central Illinois
Favorite Beaches: Cape Hatteras, Cape Town, Mokuleia
Style: allsorts
Gear: Best Cabo 6, Naish Pivot 7 and 9, Cabrinha Vector 12, Best Bularoo 16m
Long Ocean 136 and 140, Cyclone 150, Cape Doctor "hybrid", Fone Surf 5'11", Naish Global 6'0"
Brand Affiliation: None

Re: Repairing a pump seal

Postby Hugh2 » Mon May 28, 2018 6:41 pm

Thanks again, if I had known the handle unscrewed I would not have had to slice my O-rings. They were cheap anyway.


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