Sprayer pump with water in the oil

[Andyt880]

I recently bought a small second hand sprayer for humble money. I knew there was a leak around the pump somewhere when buying.
Looking into it now, the pump is letting water down into the oil in the bottom of the pump when it’s running and then forcing the water back out once it gets too full. Is this a simple fix or is a new pump the best solution? I know very little about sprayers and their pumps

 

[Timbo]

Replace diaphragms.

 

[Nick.]

I don’t know that type of pump. But it’s probably just a diaphragm gone. Should be an easy fix.

 

[robbie]

It just looks like a simple 3 piston pump.
Take the heads off fit new diaphragms drain the oil and refill with new and away you go.

 

[Hard Graft]

Fill it up most off the way with oil before you put the last diaphragm on as will save a lot off time and then top up when finished as on big pumps it is slow

 

[Andyt880]

Yes it’s a diaphragm pump. That’s as much as I know about it. I’ll get it lifted off and get a better look round it and figure it out

 

[Agriimark]

Looks like a bertolini. Diaphrams are easy enough to do and do what @Hard Graft said should be fine

 

[Hard Graft]

It’s looks like it has 2 diaphragms and they are under the covers held on by the four long bolts (blue) but you will have to remove the top first ( the red nut on both sides)

 

[steveR]

Pump Spares

Spare parts for Ar Bertolini Udor Comet Hypro Altek Annovi

www.sprayerpartsspecialist.co.uk

Used this company before for difficult to locate bits.

 

[Andyt880]

It’s looks like it has 2 diaphragms and they are under the covers held on by the four long bolts (blue) but you will have to remove the top first ( the red nut on both sides)View attachment 1036251

Ok thanks for that. What can I expect in there when I get the blue bolts loosened? I’ve never seen a diaphragm pump apart?

 

[Andyt880]

Can any one tell me what that small valve is for on top of the pump?

 

[Simon Chiles]

Can any one tell me what that small valve is for on top of the pump?View attachment 1036366

When your diaphragms pump the water/spray solution they would make the pressure fluctuate resulting in a pulsating at the nozzle. To counteract this your sprayer pump has a chamber that has a membrane that you can inflate ( gently ) with air via this valve to smooth the pressure fluctuations. Normal air pressure in this is about 1 bar, 15 psi.

 

[Andyt880]

When your diaphragms pump the water/spray solution they would make the pressure fluctuate resulting in a pulsating at the nozzle. To counteract this your sprayer pump has a chamber that has a membrane that you can inflate ( gently ) with air via this valve to smooth the pressure fluctuations. Normal air pressure in this is about 1 bar, 15 psi.

Thanks

 

[steveR]

When your diaphragms pump the water/spray solution they would make the pressure fluctuate resulting in a pulsating at the nozzle. To counteract this your sprayer pump has a chamber that has a membrane that you can inflate ( gently ) with air via this valve to smooth the pressure fluctuations. Normal air pressure in this is about 1 bar, 15 psi.

Best pumped up with a bike pump IME, not a pressure line

 

[Simon Chiles]

Best pumped up with a bike pump IME, not a pressure line

Very true, however I haven’t got a bike pump which is why I put gently, I didn’t know whether to put cautiously or carefully but regardless, a bike pump would be best.