Help fixing a pump

[Trickedem]

I have had this pump for several years and it used to be really good. I have been carrying it around on various mountain bike excursions and luckily never had to use it, because recently I checked and find it isn't really pumping out any pressure. I suspect that I just need to change the two 'o rings' at either end, but any advice would be welcomed. I think it is a dual action, not sure of the make though, although it possibly has a very faded Carerra branding.

 

[MichaelW2]

Major brands such as Blackburn offer rebuild kits . Otherwise they are disposable.

 

[Sharky]

Try applying grease to the plunger ends. Usually makes the seal good again restores pressure.

 

[Broadside]

Try applying grease to the plunger ends. Usually makes the seal good again restores pressure.

+1 a bit of Vaseline or silicon plumbers water grease has restored my track pump after it was struggling to pump up to pressure.

 

[ColinJ]

That sounds worth trying...

Which reminds me - I have been having a similar problem with MY pump. I'll stick some Vaseline on the seals before I next go out on the bike.

 

[Trickedem]

Try applying grease to the plunger ends. Usually makes the seal good again restores pressure.

I had actually tried that and you can see the grease on one of the seals. I applied more to both o-rings and no difference unfortunately.
I am going to try and get replacements to see if that helps

 

[Ming the Merciless]

Has the o ring in the pump head deteriorated?

 

[ColinJ]

I just applied Vaseline to the o-ring on my pump and it has sorted it out. Not only does it pump consistently now, it does it much more smoothly. Previously, there was a lot of friction.

 

[Trickedem]

Has the o ring in the pump head deteriorated?

Doesn't appear to have, but there wasn't an o-ring on the other end where I think there is supposed to be one. I managed to get one on there, but it may be too small

 

[overmind]

PTFE tape wrapped around the O-rings? Would this work?

 

[tyred]

Usually you find a large rubber bung type thing on the plunger end rather than o-rings.

Maybe it just doesn't come out on the photos but I am not seeing it nor am I seeing a track to fit an o-ring on (maybe it's there and I just need to go to Specsavers!).

If you don't see it, check the seal isn't stuck at the bottom of the pump body.

 

[ColinJ]

Maybe it just doesn't come out on the photos but I am not seeing it nor am I seeing a track to fit an o-ring on (maybe it's there and I just need to go to Specsavers!).

That looks similar to my bike pump. I've marked where one of the o-rings goes...

 

[gbb]

Lubricate the seals usually works well (already well covered)
A visual down the tube of the pump, just make sure there's no scoring or gouges (unlikely but easy to check)