Rebuild a 175psi 2stage 80 gallon tank compressor

[Rusty Heap]

Taking a longgggg time to fill tank.

175psi 80 gall tank HUSKY home depot.

Oil always full and clean



Rings/piston/sleeves?

Reed valves or check valve?

7 hp new motor. Mo power gooda


Point me to www parts

[Zeke]

Why 175 PSI? The last 50 is what takes so long. I get by nicely at 100 PSI, but I'd take 125 as very adequate. Dial that dude back. Want more air time? Get a bigger tank.

[sammyg2]

Most likely suction and/or discharge valves in heads.

take some temperatures and we can diagnose.

1st stage inlet (ambient)
1st stage discharge
2nd stage suction (if it has interstage cooler)
2nd stage discharge

[billybek]

Is that the original pump with that tank?
Looks like the wavy pipe between 1st and 2nd stage is the intercooler.

Edit: Looks like the original pump on the tank.
I do agree with Milt on this one, why do you need 175#?

[asphaltgambler]

Depending on what you're doing a running ( constant ) pressure of 150 is optimal. So running pressure will be slightly higher. Anything more than that is hard on your equipment, lines and pump. You're really not accomplishing more with running pressures past that.

If you're not getting oil in your tank, then it is likely the valving that's failing. Assuming the air cleaner element is clean / unobstructed.

[Rusty Heap]

I do have the regulator set to 120.........


will get 'er warmed up, and do some IR temp readings.


THX!

[cmccuist]

It’s easy to pull the heads and take a look at the reed valves. One or more might be broken off.

[Rusty Heap]

great ideas , no oil in 80 tank,


not much water either in Tank, or Water trap.

Compressor runs to 170 and from 0 psi in tank to full took almost 8 minutes.

regulator feeding air hose set at 120

Lost my temperature data sheet, but got numbers with non-contact IR laser temp gun


will post numbers soon.

[sammyg2]

Originally Posted by Rusty Heap

great ideas , no oil in 80 tank,


not much water either in Tank, or Water trap.

Compressor runs to 170 and from 0 psi in tank to full took almost 8 minutes.

regulator feeding air hose set at 120

Lost my temperature data sheet, but got numbers with non-contact IR laser temp gun


will post numbers soon.

As air is compressed, it gets hotter (duh Sammy)
If you have leaking valves, the same air will get compressed more than once and get even hotter.
IOW the cool air is sucked in and compressed, and gets hot. Some if it leaks back it suction through a leaking suction valve. It gets sucked back in and gets compressed again, and gets even hotter.
That can be a symptom to help diagnose.

if the 1st stage is weak, the compression ration on the second stage will be higher and the 2nd stage discharge temp will be higher.

if the 2nd stage is weak, the 1st stage discharge temp will be higher.

but if the suction valves are significantly hotter on either stage than the air entering the stage, that indicates a leaking suction valve.

try to identify:
1st and 2nd stage discharge temperature
1st and second stage SUCTION VALVE temperature (not inlet temp)

[Rusty Heap]

Brain Trust, we thank thee.



ambient temp 70 degrees.


started with 0 psi in tank. full drain to full fill.


after 2 minutes running it was up to 100 psi
1 stage in, 70F
1 stage out 230 F

2nd stage in, after the S shaped cooling pipe, was 160F.
2nd stage out, from the copper line that runs to tank, 190F



5 minute mark, 135 psi.

1st stage out, same, 230ish F
2nd stage in 170F
2nd stage out 230F


7-8 minutes Tank Full, compressor shuts off. 165 psi

1st stage out, 270F
2nd stage in, 180F

output to tank, 270F




thoughts ?


No squirrels nor kittens or bunnies with cute furry ears and bunny toes were harmed in the Boeing supervised testing procedures.

[1990C4S]

Why not set your tank pressure switch to 120 PSI? Why charge the tank to 175?

I think you will see a big difference in the run time.

[sammyg2]

Hmm, since the 1st stage discharge got hotter faster than the 2nd stage, I would suspect the 1st stage is working harder and the 2nd stage is not taking the gas away fast enough which raises the 1st stage compression ratio.

Your intercooler is working well but I suspect the 2nd stage is very weak.
Pull off the head and liquid-check the valves. Turn the head upside down and fill the chamber with water and see how fast it leaks through one or both valves.

It could be a broken piston ring but that is not as likely as a broken or warped discharge valve.

The valves are easy to replace if you can source a repair kit. And if you can get one, do both cylinders. Easy peasy.
Is there a manufacturer casting or name plate on the compressor?

[sammyg2]

if that thing is rated at 14 cfm at pressure, it's only doing about 1/4 of that now max.

even if you set the pressure lower it's going to run longer than it should and run hotter than it should.
230 degrees is too hot IMO, 270 is way too hot.
Not good fer it.

[sammyg2]

a nuther thing you can do if you don't want to take it all apart:

Take off the suction and discharge lines from the 2nd stage.

Use air to pressure up the discharge fitting and see if air comes out either the suction line or the crankcase vent.

If air comes out the vent, discharge valve bad.
if air comes out the suction, both valves bad.

[sammyg2]

I'm about 99% sure that's a Campbell Hausfield compressor.

The HS750000* is the model number of the compressor, can't read the last digit. Might be a 1, prolly a "P"

HS750000P




https://mastertoolrepair.com/air-compressor-pump-parts-hs5010-hs750001av-hs750001aj-hs750000p-p-20417.html?osCsid=vrvepu9e4k4ismgdadqt488tc6

[sammyg2]

looks like parts might be NLA.
A call to campbell hausfeld could be worth the dime.

A replacement CH compressor is gonna be in the $650 range.

Harbor freight sells a slightly smaller version for $165



Central Pneumatic® 5 HP 145 PSI Twin Cylinder Air Compressor Pump

https://www.harborfreight.com/145-psi-5-hp-twin-cylinder-air-compressor-pump-67698.html

[cabmandone]

Don't know where your BBQ is located but lookup Eaton compressors in Eaton OH. They'll hook you up.

At one point my dad's CH compressor was having difficulty building pressure, in the tank there is a check valve I believe where the inlet line goes into the tank. I had to replace the check valve on his.

[Rusty Heap]

again, all good tips.


God loves us so he invented wrenches to take stuff apart.


I actually bought that HF pump and brought it home. didn't even take it out of the box. went back the next day.


do it right.......I hear valves in my future.