3 stage 3000psi pump oil ??
so i got a new ( to me ) electric pump ,
its a small 3 stage 3000psi pump , it has a section that gets filled with oil and skrews on the bottom ,, the oil recomended is LEHIGH 402 ,, never hear of it ??? me either . says change evey 50 hours.
if anyone has some recomendations id like to hear them ,,
not sure what weight either , figure haudralic oil ?????
i can show a pic if it helps ,
its a 27 volt 4 amp electrick motor
driving a 3 stage , 1.5”’ >1” >.75” maybe ( approx)
2.5 cubic feet / minute .
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Viewing 14 replies - 1 through 14 (of 14 total)
even with some heavyer oil in the piston it doesnt change , i figured that would help but didnt .
so now im ready to figure out why it only goes to 1500psi ….? any guesses ?
i only pay’d $40 for it but want it to work like brand new ,, haha
running too slow?
too much blowby?
poor disch valves?
leaking connections?
be good to have a guage in each stage to see where the trouble is.
so i got it runnig well , but it will only run as hi as 1500psi , doesnt seem like it will do more .
even with some heavyer oil in the piston it doesnt change , i figured that would help but didnt .
so now im ready to figure out why it only goes to 1500psi ….? any guesses ?
i only pay’d $40 for it but want it to work like brand new ,, haha
Jezx:
That 3/4 hp motor is the way to go.
Getting 27 volts will be hard to come by.
4 amps is when it starts up with no air pressure.
65 amps is when it is working against full pressure.
27 amps at 65 amps is very tough to come by, unless you use the batteries. 65 amps will run down a car battery real quick.
3000 psi on the name plate — thats all you will need!
Very cool project!!!!!
Mark
i only know whats printed on it . 3000psi running pressuer . it was used for scuba tanks by the owner
the amps are min of 4 , max 65 ( not sure why max ? ) , takes a bit to turn it on high pressure , a .5hp would run it for sure tho .
i dont have a 27v power source hear , i have a 25 v i will get tomorow ,. or run 24 v with 2x 12v batery in ser’ . HEHE for now i have a pully wheel mounted on the fan and i run it that way , off a 3/4hp motor ,, doesnt take much to run realy ,
im not sure the motor on it even works , i hope so , but havent tested it ,, probabaly should , i think the guy said a brush was gone ,, but thats nothing .
hope i can post some good results soon ,
Jezx:
Where are you getting your 27 volts to run it?
27 volts and 4 amps = about 1/6 th horsepower. (sounds a little small)
Are you sure it isnt 40 amps??
40 amps and 27 volts is about 1.5 horsepower. (sounds more like it)
How do you know its rated at 3000 psi?
Very cool project!!!!
Mark
here are some gut pic’s of her .
i have a little problem of compression ,, i get about 1500psi max ,, i figure the valves need to be adjusted and some oil is not getting in to areas , , i did mess with it a little but need more time … dont we all .,
the pic shows the 3 pistons , one is 1.68 then .68 then .277 ”
not sure why that size but thats them , the bottom of the piston chamber has a flat disk , its the valve end ,
as seen in the picture 2 , the bottom has no hole leading to the fitting on the outside , there is a heavy spring inside which holds the disk closed . hope i get it running good , like t have the full potential , also it seems that the faster it runs the better compression , i figure these pumps will not run riht on 2-4oo rpm . should have about 1000 +
so i got some mobil oil ( not cheep) , i think i have to take it apart and see if i cant get it working better , should realy clean it to , i will try and get some picture ,
and sizes , might help some one to know , or just my self , 🙂
A Walter Kidde compressor head in good shape as in refurbished runs about $1,000usd if….. IF you can find one 🙂
I have one 2.4 scfm unit up and running with a refurbished unit in box
also have a 4.0 scfm unit that is requiring a bit of work but will have that one on a gas engine for portable gun range air 🙂
lucky me!!!!!
Is it a Kidde? It sure is compact. Someone here needs to buy some crate on a military auction that when opened up has about 40 of those in it. Then you have to pass them on to us here on the boards for about 100 each ).
its a small 3 stage 3000psi pump , it has a section that gets filled with oil and skrews on the bottom ,, the oil recomended is LEHIGH 402 ,, never hear of it ??? me either . says change evey 50 hours.
if anyone has some recomendations id like to hear them ,,
not sure what weight either , figure haudralic oil ?????
i can show a pic if it helps ,
its a 27 volt 4 amp electrick motor
driving a 3 stage , 1.5”’ >1” >.75” maybe ( approx)
2.5 cubic feet / minute .
Jez, do not use hydraulic oil!!
You want to get some Mobil Jet Lube. it is used in heli gear boxes etc.
I went out to the local airport and the heli operator gave me a couple quarts.
If you cannot get that then second best would be Castrol Synthetic 10w30 motor oil.
Very nice find for sure!!!
I am into Walter Kidde compressors and they are the neatest littl machines.
If you want I can give you a forum to check out with good resources and they would love to hear about your compressor 🙂
Walter…
nice, small and compact, do you want to sell it 😀
ok her she is , the top part has a cooling fan , then below that is the motor , then the pistons , then the oil pan ,
the cooling fins on the pistons are lil over 3” or 8 cm .
thats all i know so far .
What kind of pump is it? Everyone here is interested in that kind of thing, even more so if you got a pic ).
Viewing 14 replies - 1 through 14 (of 14 total)
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Is the belt slipping?
If there is a crank case vent, is it blowing air (blowby)?
cover the vent with your finger, and see if the pressure builds up in the crankcase.
It would not take much blowby to limit the pressure.
If you put in heavier oil, and the pressure did not go up, then it may not be blowby. That would make me look more tword a leak or a bad valve.
Spray soapy water over all the connections while they are under pressure to see if there is a leak.
does one cylinder get hotter than the others?
Could be an exhaust valve is not seating, causing that cylinder not to contribute to the pressure build up.
look at the valve seats and poppets very carefully (use a magnifing glass).
Look for nicks or cuts or scratches in the seating surfaces.
Are they built so they could be “ground in” using a very fine valve grinding compound? I would try to clean the valves first before trying to grind them. Make sure they have no gum or carbon on them.
I see from the pictures that there are inlet and outlet connections for each cylinder. Can you disconnect all tubes, and test to see if each cylinder pumps air?
WITH THE COMPRESSOR RUNNING:
Each cylinder should pull a vaccum at the inlet, if you cover it with your finger.
Each cylinder should create a pressure at the outlet, if you cover it with your finger (do not press hard or you may inject air into your finger).
TO TEST THE VALVES:
Borrow an automotive pressure / vacuum leak tester.
Connect it to the outlet connection of each cylinder and see if it will hold a pressure (with the compressor off).
Conect it to each inlet connection and see if it will hold a vacuum (with the compressor turned off).
Mark