hypro pump problem

[RigglePLC]

Hypro D-252. What are the symptoms of a bad dampener diaphragm? The one on the top. Is it difficult to replace? How much air pressure should it have? How often does it need to be aired-up?

Thanks for your comments.

[heritage]

Hypro D-252. What are the symptoms of a bad dampener diaphragm? The one on the top. Is it difficult to replace? How much air pressure should it have? How often does it need to be aired-up?

Thanks for your comments.

Wont hold air....Knockin or "Backlash" of the gear Reduction......Shaky/Jumpy hose.

Super easy to change.

I check 2x a season...Begin and Mid.

Run 30 psi in my D-30's.

Pete

[foreplease]

I don't have one but did a search to find out what one looks like. This came up instead:
When the fluid in the oil sight glass turns a milky gray color it means that one (or more) of the diaphragms has ruptured and the fluid to be pumped is mixing with the oil in the crank case.
I found it here (http://hypro-diaphragm-pumps.com/Hypro-D252-Diaphragm-Kit-9910Kit1723/M/B0012XPVN0.htm)with a repair kit for $50.

[garydale]

Before you replace the diaphragm. Check to see that the air fill valve is snug and holding.
Put ''spit" on your finger and place over the valve stem.
It shouldn't rarely need air.

[RAlmaroad]

Riggs: I just went through one of these. That diaphragm is thicker than an inner tube and is held down with those 4-6MM hex bolts on top. Book says to put about 20% of your working pressure in the chamber. It only takes a short blast to get 100lb. I run mine at about 25PSIG. They're hardly nothing to change but I doubt that anything could be wrong. Are you having anything going wrong?

[Blood Bought]

Ditto, correct pressure is 20% of your working pressure. If the diaphram is ruptured you won't be able to get a pressure reading with a tire guage after adding air or liquid will spew out of the valve. If you see milky oil in the sight glass one of the pump diaphrams are ruptured not the compensator diaphram.

[turf&tree]

We had 2 Hypro D 30's lock up this week. I think it was operator error. I run a D 30 and 2 UDOR Kappa 55's and never have any problems. The UDOR's are going strong into their 2nd season without a rebuild yet. Would run Bean pumps If we could afford them, best in the business.

[RigglePLC]

Not sure. I am getting a lot of needle bounce in my pressure guage. Bounces between 80 and 120 pounds when pump is running. Added more air with bicycle pump. But its air guage seems to drop down to zero after about 30 seconds.

[DUSTYCEDAR]

go to the hypro web site and all the info you need is there
if your pump is worn out it must be time to retire because you have made enough money :clapping:

[EVM]

You can tell if your diaphram is busted by smelling the inside of you tank. If you smell oil or see oil in the water, the diaphram is broke. When mine broke, it just broke, I never noticed a difference about anything other than the oil sight glass looking white.

The diaphram is not hard to change but since one might be bad, you should just change them all and all of the o-rings/valves too. Be careful putting the bolts back in the case, grease the bolts, maybe some "never sieze", you might just want to replace the old bolts with new ones because the old bolts could damage the threads in the case.

You might have to un-mount other things on the unit so you have working space for hand tools.

[Blood Bought]

Not sure. I am getting a lot of needle bounce in my pressure guage. Bounces between 80 and 120 pounds when pump is running. Added more air with bicycle pump. But its air guage seems to drop down to zero after about 30 seconds.

The dampers job is to eleminate the bounce you're seeing in the pressure guage. If the damper is leaking down, indicated by the bicycle pump guage drop, you have a pin hole in the damper or the damper cover is loose. Check the bolts on the cover first. If they are all tight get a damper diaphragm only and replace.

[RAlmaroad]

This may be insignificant--I get a lot of needle bounce when the tank begins to empty out and there's air in the feed line. There's still some bounce even with a full tank due to the nature of the beast. They're built a whole lot like the old two (2) piston tractor engines--a lot of compression and a lot of release of pressure. Maybe something for thought.

[heritage]

Not sure. I am getting a lot of needle bounce in my pressure guage. Bounces between 80 and 120 pounds when pump is running. Added more air with bicycle pump. But its air guage seems to drop down to zero after about 30 seconds.

Riggs,

I only have had needle bounde when a check valve went bad.

Remove them, clean valve bodies and replace with new Valves.

A small piece of sediment can sometimes damage the valve seat.

Pete

[Blood Bought]

I get needle bounce any time the damper pressure is way off and particularly on the low pressure regulator side. The same bounce also appears in the hose line when the damper pressure is incorrect. If you have liquid in the tank, part tank or full if the damper is at correct pressure or isn't defective you should see very little bounce. I've been running a D-30 Hypro pump for 20 years. You will see bounce once the tank empties and the pump starts sucking air.

[phasthound]

Riggs,

I only have had needle bounde when a check valve went bad.

Remove them, clean valve bodies and replace with new Valves.

A small piece of sediment can sometimes damage the valve seat.

Pete

Most of my spraying is done with an antique Comet diaphragm pump. This spring, I had no compression. Ordered a rebuild kit, took the pump apart and found 3 of the 4 valves had debris that kept them open. Cleaned them out & everything was fine. Now I have spare parts ready & waiting for the next breakdown. :)

[RigglePLC]

Well i did it: I had an extra diaphragm. Thanks guys. It really was an easy job. 10 minutes job--took me half an hour. Socket wrench with 6 mm allen socket was helpful. Runs very smooth now. I will wait and see--perhaps the valve itself is leaking. The old diapraghm looked to be OK.

[foreplease]

Good going. I am not as good at that kind of thing as I would like to be. The more you get to know your own equipment the better IMO.