Right techy question for ya'll

[Phantom 631]

I got around to trying my Hills Stirrup Pump this evening

 

It has a quick release fill adaptor on it for my S200

 

Attached pump hose to gun, guage reads ZERO pressure.

Now I know I have only fired no more than 15 shots since my last fill to 185 bar from the dive tank on Monday and I loosed off a couple of dry shots to make sure there was still air in the gun, yep its there ok

 

Anyhows I pumps and pumps and pumps and the guage moved a gnats cock hair but when I stopped pumping the pump handle rose about 5 inches. I opened the pressure release valve and the handle went back down.

 

My question is, does anyone know how to service a Hills Pump and make it function correctly?

 

If so please give me a rundown of what I need to do please

 

Phantom

[RaiderBoy 19]

Try just pumping and pumping because you have to build up the preassure inside the pump and hose before any air goes into the gun or if the handle is rising like it did on mine it needs servicing which is easy just buy a box of different size "o" rings and replace all the ones inside the pump and the ones in the connector that joins the gun and pump.

 

Richard

[Phantom 631]

Try just pumping and pumping because you have to build up the preassure inside the pump and hose before any air goes into the gun or if the handle is rising like it did on mine it needs servicing which is easy just buy a box of different size "o" rings and replace all the ones inside the pump and the ones in the connector that joins the gun and pump.

 

Richard

 

 

Cheers Richard, So I will have to disasemble the pump? Um... Something new to do, I dont like new things

 

I'll have a go tomorrow.

 

Phantom

[RaiderBoy 19]

Try just pumping and pumping because you have to build up the preassure inside the pump and hose before any air goes into the gun or if the handle is rising like it did on mine it needs servicing which is easy just buy a box of different size "o" rings and replace all the ones inside the pump and the ones in the connector that joins the gun and pump.

 

Richard

 

 

Cheers Richard, So I will have to disasemble the pump? Um... Something new to do, I dont like new things

 

I'll have a go tomorrow.

 

Phantom

 

Yeah you will have to dismantle the pump but its wasent as hard as i thought either. you just unscrew the screw abouve the foot plate section

[wuzzy 0]

sounds like the quick fill adapter might be at fault try and see if you can apart and check the seals

[hughes_jh 0]

sounds like the quick fill adapter might be at fault try and see if you can apart and check the seals

 

I don't think this is the prob as his gauge would be going up to +200 Bar if air wasn't going in the gun

[Phantom 631]

I'm going to strip the pump and see if I can spot anything obvious this afternoon. I'm not sure if there is anything to go wrong with the QF adaptor is there? I'll have a good look at it though!

From what Richard said, his pump had the same or very similar problem.

I have some various size O-rings.

When I got the pump given, my mate told me he thought it needed a service. He hadn't used it in a number of years.

So if it costs me anything to have it repaired, its still bound to be a darn sight cheaper than buying one from new or even second hand

 

I'll let you all know how I get on.

 

Phantom

[foxon 0]

I'm going to strip the pump and see if I can spot anything obvious this afternoon. I'm not sure if there is anything to go wrong with the QF adaptor is there? I'll have a good look at it though!

From what Richard said, his pump had the same or very similar problem.

I have some various size O-rings.

When I got the pump given, my mate told me he thought it needed a service. He hadn't used it in a number of years.

So if it costs me anything to have it repaired, its still bound to be a darn sight cheaper than buying one from new or even second hand

 

I'll let you all know how I get on.

 

Phantom

Hi Phantom, A common problem with Hills, Logun, BSA & Stealth pumps is moisture, the main brass valve with "o" ring gum up & do not seat properly allowing air to back up into the stirrup, a good strip down & overhaul will put your pump back to good working order, those that have the glass beads in place should be washed in detergent & dried, this will help any moisture comeing into the pump to settle in the trap & released on the bleed off, rather than into your pride & joy, another thing to look for is scoreing on the primary, secondary & tirchary shafts of the pump as this does not help keep the operation smooth, the main cylinder of the pump can also become scored if the seals have become very worn, it is best to polish out any marks before fitting new seals, makeing sure to lubricate with a good quality silicon grease.

foxon.

[Phantom 631]

Hi Phantom, A common problem with Hills, Logun, BSA & Stealth pumps is moisture, the main brass valve with "o" ring gum up & do not seat properly allowing air to back up into the stirrup, a good strip down & overhaul will put your pump back to good working order, those that have the glass beads in place should be washed in detergent & dried, this will help any moisture comeing into the pump to settle in the trap & released on the bleed off, rather than into your pride & joy, another thing to look for is scoreing on the primary, secondary & tirchary shafts of the pump as this does not help keep the operation smooth, the main cylinder of the pump can also become scored if the seals have become very worn, it is best to polish out any marks before fitting new seals, makeing sure to lubricate with a good quality silicon grease.

foxon.

It certainly has gummed up , your spot on there Foxon

 

I've cleaned out the little section that holds the little spring, valve and o'ring. I can't get right inside though I've gently scraped as much crap out as I can using some pipecleaners and rags but think there is still a lot in there.

I've also washed the little 'bullet' witht he o-ring on and was suprised to find that it too is brass and now shines bright! The little spring that pushes the 'bullet' closed I thought was going to disintegrate until I cleaned it and its in good condition.

Although I cleaned it as much as possible, there is still air returning to the pump column as its still rising. The good news is though (after a long time pumping) the needle on the gauge made it to about 750psi where it wasnt moving before, the bad news is its still a couple of thousand psi off where I need it

 

What I am finding very confusing though is that when I connect the QF adaptor, the needle stays put, so how do I know how much is actually in the cylinder?

 

Phantom

[foxon 0]

Hi Phantom, A common problem with Hills, Logun, BSA & Stealth pumps is moisture, the main brass valve with "o" ring gum up & do not seat properly allowing air to back up into the stirrup, a good strip down & overhaul will put your pump back to good working order, those that have the glass beads in place should be washed in detergent & dried, this will help any moisture comeing into the pump to settle in the trap & released on the bleed off, rather than into your pride & joy, another thing to look for is scoreing on the primary, secondary & tirchary shafts of the pump as this does not help keep the operation smooth, the main cylinder of the pump can also become scored if the seals have become very worn, it is best to polish out any marks before fitting new seals, makeing sure to lubricate with a good quality silicon grease.

foxon.

It certainly has gummed up , your spot on there Foxon

 

I've cleaned out the little section that holds the little spring, valve and o'ring. I can't get right inside though I've gently scraped as much crap out as I can using some pipecleaners and rags but think there is still a lot in there.

I've also washed the little 'bullet' witht he o-ring on and was suprised to find that it too is brass and now shines bright! The little spring that pushes the 'bullet' closed I thought was going to disintegrate until I cleaned it and its in good condition.

Although I cleaned it as much as possible, there is still air returning to the pump column as its still rising. The good news is though (after a long time pumping) the needle on the gauge made it to about 750psi where it wasnt moving before, the bad news is its still a couple of thousand psi off where I need it

 

What I am finding very confusing though is that when I connect the QF adaptor, the needle stays put, so how do I know how much is actually in the cylinder?

 

Phantom

Hi Phantom,

Can see that you have got to the problem, but the little "bullet" you cleaned thats made of brass, might not be seating properly, as the spring that keeps pressure to stop air going back up might need further pressure by replacing it or tightening the ventilated cap screw that retains it all, over adjustment will cause the pump to lock up as air will not pass through the valve, too little will cause air to go back up, as for the guage check the port that runs through the block is not blocked, also check the brass body on the guage, as the port on these can block, I repair quite a few of these a week & if they get gumed up the guage internals get the same treatment, but not easy to put right, I would either borrow a guage & see if it sorts the problem or buy new.

foxon.

[Phantom 631]

Hi Phantom,

Can see that you have got to the problem, but the little "bullet" you cleaned thats made of brass, might not be seating properly, as the spring that keeps pressure to stop air going back up might need further pressure by replacing it or tightening the ventilated cap screw that retains it all, over adjustment will cause the pump to lock up as air will not pass through the valve, too little will cause air to go back up, as for the guage check the port that runs through the block is not blocked, also check the brass body on the guage, as the port on these can block, I repair quite a few of these a week & if they get gumed up the guage internals get the same treatment, but not easy to put right, I would either borrow a guage & see if it sorts the problem or buy new.

foxon.

 

Hi Foxon, thanks for the info, really appreciate it

 

I have again stripped the main assembly. The valve seems to be seated properly now.

 

I've also taken all the bits off the main block and cleaned everything as much as I can.

When I removed the stem from the block, the ventilated cap had become unscrewed and detatched it was held within the main block by what appears to be some form of plastic/foam thats in the bottom of the block well. Am I correct in assuming this is some sort of particle filter? If not whats it for, and can it be removed (I re-assembled then disassembled it again and the same thing happened!).

 

The guage seems to be in good condition, there was no gunk inside that and I cleaned all the other ports on the block.

 

Finally, when I now pump (without the gun) the stem still rises but only by about 1 inch, should it remain at the bottom or is this little rise normal?

 

Take care

 

Phantom

[SEAN3513 7]

phantom, the gauge will not register any pressure when it's just attached to the gun.

 

you have to pump it, which will be easy until the pressure in the gun and pump become equalised, then, when the pressure is the gun resevoir starts to increase pumping becomes much harder it is at this change over point

(between easy puming and not so easy) that the approx pressure in the gun is registered on the pump gauge.

 

i hope that makes sense ?????

 

cheers

 

atb

 

sean

[Phantom 631]

i hope that makes sense ?????

 

cheers

 

atb

 

sean

 

Many thanks Sean, It makes perfect sense

I had a feeling that it was something along those lines.

 

Just gotta wait for Foxon to come back on and answer the bit about the blue ring thing in the base:)

 

Gow do I get into the cylinder stem of the pump? I tried to remove the bottom of the stem (Brass assembly) but it just seemed to turn and turn and turn so I am assuming that it was not designed to be removed?

Also inside the main stem is it the same as a normal type pump ie a cup washer type like a bike pump or the spring piston in a rifle?

 

Thanks again Sean

 

Phantom

[foxon 0]

i hope that makes sense ?????

 

cheers

 

atb

 

sean

 

Many thanks Sean, It makes perfect sense

I had a feeling that it was something along those lines.

 

Just gotta wait for Foxon to come back on and answer the bit about the blue ring thing in the base:)

 

Gow do I get into the cylinder stem of the pump? I tried to remove the bottom of the stem (Brass assembly) but it just seemed to turn and turn and turn so I am assuming that it was not designed to be removed?

Also inside the main stem is it the same as a normal type pump ie a cup washer type like a bike pump or the spring piston in a rifle?

 

Thanks again Sean

 

Phantom

Hi Phantom,

Sorry for not replying, have been up to my neck, as Sean said on the first part, as the main valve inlet on your rifle is one way, so the reading is set between the pressure build in the fill pipe on entry to the rifle fill port, as for the liner this is part of the moisture trap, as for the removal of the cylinder tube, it will turn but you should be able to pull away the stem from the block, takes quite a bit of force, the insides consist of "0" rings & collers that act as guides, if they are not sealing properly some of the air will bypass causeing the pump to rise, once new rings are in place you will be sorted.

foxon.

[Phantom 631]

Hi Phantom,

Sorry for not replying, have been up to my neck, as Sean said on the first part, as the main valve inlet on your rifle is one way, so the reading is set between the pressure build in the fill pipe on entry to the rifle fill port, as for the liner this is part of the moisture trap, as for the removal of the cylinder tube, it will turn but you should be able to pull away the stem from the block, takes quite a bit of force, the insides consist of "0" rings & collers that act as guides, if they are not sealing properly some of the air will bypass causeing the pump to rise, once new rings are in place you will be sorted.

foxon.

 

 

No worries for delay. I wasn't expecting instant reply as most people on here (bar me and a few others) have a life outside THL

 

I'll have a go at pulling the thing out a bit later.

 

Many thanks for the info guy's its been invaluable and most helpful indeed.

 

Phantom