I've never run into that trouble but it must be said our pumps, though quite a few years old, aren't heavily used -- I use the one nearest my bike once a month.

It sounds like you need a new head which, since it is only available attached to the tube, means you're going to be out of twenty quid plus postage from SJS. Ouch!

You have it there Andre. That's my one. And my one before the one I have now!

The trouble is when I go to pump the air doesn't come out to go in from the schraeder outlet,but comes outta the Prestatyn fitting. I am told to cover the Presta outlet with a finger to pop the small ball inside so as to pop  the air  flow into the schraeder outlet. Tried. Several times. It don't work,and as I have to pump whilst covering the other outlet my OH has to help.

Still no go

I did manage to inflate the tyre using another gizmo that attaches to tube valve  and sks pump head,but what a palaver. The locking system doesn't seem too good either. I might have it wrong,but if I have I've bin doing it wrong for 40 years.

Got over the frustration now...until next time.

Frustrating...

Thanks!  Yes, I hope it gets a chance see the open road instead of the inside of my garage and travel to some of the places I never made it to. I had big plans, but alas.

I'm surprised that you have trouble with anything SKS makes. I have quite a bit of their gear, and it is likely that almost everyone on this forum has at least something from SKS, even if they don't know it. (Those baffled by this remark could ask who made their mudguards.)

We liked the SKS Rennkompressor so much that we bought a couple more. It's a tall orange pump much used by professional racing mechanics, hence the name. Far too large and awkward to take along on a bike for roadside use. It stands at the top of the SKS range of pumps, priced accordingly but worth it because a full panoply of spares and rebuild parts for this ancient design is available for pennies if unfortunately priced accordingly; there's also a more modern-appearing version painted blue with a choice of digital and analog pressure readouts, but I don't see the point of replacing pumps that are working perfectly. It used to come with a choice of four heads, now three, including the most useful for cyclists, which has both Presto and Schraeder ports, operated by an over-centre flip lock. Absolutely no problem with mine in roundabout fifteen years; in fact, I appreciate its height as I don't bend so well any more. It moves a high column of air, so it is a boon for the 622x60mm Big Apples I use, even though it was designed for quickly pumping up high pressure narrow racing tyres.

In particular, the right head for a cyclist is black and orange, and there's no faffing around: you just push it on the valve in the correct hole to match your valve and flip the lock. But at least one of the other two heads, all interchangeable with the ones we have, is a pre-War design of brass with a serrated nut on it that I took one look at and rejected as hostile to my skin; I do however know a four-seasons Dutch cyclist who prefers this design as the simplest engineering and therefore the one least likely to give trouble. The heads come with the tube attached, so they are attached to the pump end. The available heads are shown here:
https://www.sks-germany.com/en/products/rennkompressor/
and the one most cyclists would need is this one:


Thorn HQ has stock at SJS, see this link:
https://www.sjscycles.co.uk/pumps/sks-rennkompressor-floor-pump-mv-head/
and scroll down for the various alternative heads.

Ever hate something promised that it isnt?

I was alive when Jimmy Saville  used to advertise for BR. I didnt hate JS but BR. It had Sir Jim relaxing on a train with a ditty song saying how relaxing and comfortable and easy such journeys are. They were HELL. Late,overcrowded,cancelled or thrid world cattle trucks. They just werent as advertised.

Soon,other companies and politicians offered Heaven,but then never delivered.

But recently I replaced a dual headed SKS trsck pump head with another because the old(but relatively new)track pump head didnt seem to work. I bought the new dual head track pump head....and that doesnt seem to work.

Oh,yeh,you gotta break the seal by putting your thumb across the presta head outlet to relase the wothchamacallit to make it switch over to the schrader vale. Do what? Yeh,that or place the head in water and blow and....story goes on for 99 pages. Has anyone got an axe spare. WTF! I'm olde.my wofe's getting on,I have a bad back,my garden alley is often a Siberian wind tunnel. WTF! Does anyone make anything that works thesedays.? I've only just blown up my town bikes tyres to the recommended pressures: I'm exhausted. I was within an inch of having to take my bike by car down to the cycle shop to have my tyres inflated. That's goodbye an hour. Instead I had to faff around for 30 back breaking minutes to get another gizmo that attaches to the shraeder valve that then attaches to the SKS dual head and the pumps tubing. Wottacarryon.

Is SKS havin a laugh? Anyone out there with any other simple job that works on both shraeder and presta valves that doesnt involve dying before your tyre is inflated?