Changing the cut-off setpoint on a Rigid compressor

by Andrew
(Santa Cruz, CA)

Hi Bill,


I'm using a Rigid 1.8 hp compressor for a fairly strange application: to pressurize helium gas to 2-5 psi, at 3 scfm. The rated speed of the compressor (for air) is 5 scfm, but it quickly overheats if I run continuously with helium (since helium has a much lower thermal conductivity than air). At lower flow rates (~0.5 scfm) the temperature cools off between cycles and the compressor is fine.

I don't need the high maximum pressure of 170 psi that the compressor can provide, and I'm thinking there should be less heat generated when working at lower pressures. I'd like to lower the cut-off pressure limit to 10-20 psi, but there is no obvious, accessible adjustment. If I took the electronics box apart, should there be a way to change the setpoint? Or, is there likely a relay that is fixed at 170 psi? Any ideas?

Thanks for your help,
Andrew

___________________
Bill says...

Andrew, the cut in and cut out set points for an air compressor are typically adjustable by the adjustment nuts inside the pressure switch.

See the page on pressure switches for more info.

As always, I advise against changing the factory settings of an air compressor, as they are optimized for that compressor based on its design/build.

Your needs (which I don't really understand)take you outside of the norm, and maybe you will be OK doing so, I really don't know.

Cheers and good luck.

Bill

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Ridgid Compressor Issues.

GP90135 Ridgid Compressor pressure to tool are weak

I have GP90135 Ridgid Compressor that is gas, my pressure to tool are weak

I have requlator all the way up, but it only builds up to 125 My discharge pressure is weak. But I don't think I have a check valve I wonder can my unloader serve as all of that?

________________________
Bill says...

You don't indicate how long you've had this Ridgid Wheelbarrow type air compressor, nor how well it has been maintained.

First, make sure the belt is tightened properly.

Next, check the intake filter to make sure that it is clean.

From the manual, the manufacturer also states this..."Low pressure can be due to worn rings and cylinder walls. Correction is made by replacing the rings, cylinders, and pistons as required". Since I have no idea how old this air compressor is, I cannot tell you if this is likely a problem for your compressor or not.

Post any more questions as a comment here, please.

Cheers,

Bill



Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Ridgid Compressor Issues.

Ridgid OF45150 compressor will stall and...

by alex
(sc)

Ridgid OF45150 air compressor will stall and stop after a few seconds running if pressure building

Ridgid OF45150 air compressor will start fine, but as pressure is rising motor will slow down, stall and trip breaker panel. Runs fine if plug is removed from tank (no pressure building)
_______________
Alex, the motor cannot cope with the increasing load being built in your compressor.

That could be a bunch of things, mechanical or electrical.

Pull the intake filter. Any change in operation? If so, replace the filter element.

Have you relocated the compressor? If so, are you now using an extension cord when you were not before? If you are using a cord, plug the compressor directly into a socket and see if that makes a difference. If it does, then stop using an extension cord, or buy one that is industrial, I'd go with a 12 gauge, and a max of 25'.

With the air gone and the compressor off, pull, clean and replace the tank check valve. That may or may not be part of the problem, but it's an easier check / fix, and you can eliminate that if it makes no change.

There is a page linked from the site map on how to check capacitors. That's your next step.

There are more checks to be done, all located on this site. Do these, and post a comment if there is no change.

Cheers,

Bill

Click here to read or post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Ridgid Compressor Issues.

TRI-STACK CRAP

I SWITCHED BACK TO MY OLD N
RIGID WHEELBARROW COMPRESSOR AFTER OL-50 AFTER FIGURING OUT THE LOW OIL ISSUE PROBLEM ,THATS WHY IT HAD SHUT DOWN ON ME , SO , IT SAT FOR 3 MONTHS AND I BOUGHT THE NEW TRI-STACK , WOW DID THIS THINMG LOOK COOL , ONLY ONE PROBLEM IT IS ONLY BY ITS LOOKS DOES THIS COMPRESSOR SELL ITSELF . I WILL NOT GO INTO ALL THE PROBLEMS NOT ENOUGH TIME TODAY , I JUST FOUND AND READ ALL THE REVIEWS A LITTLE TOO LATE . WARNING DO NOT BUY THIS COMPRESSOR , I , LIKE OTHERS THOUGHT I JUST HAD A BAD ONE AFTER BRINGING IT BACK 3 TIMES , RIGID , YOU SHOULD GET OUT OF THE AIR COMPRESSOR BUSINESS , HOW DARE YOU MAKE SOMETHUING LOOK SO COOL AND IT NOT WORK.

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Ridgid Compressor Issues.

Rigid GP90135 won't build above 50 PSI - throttle valve?

by John
(Rockledge, FL)

Have a used gas powered Rigid GP90135 that won't build above 50 PSI.

Motor starts but doesn't seem to run any higher than idle.

I can manually increase the RPM but it has no effect on the pressure in the tank.

The throttle unloader is constantly venting whether engaged or disengaged. I did disconnect the stainless braided hose from the pump to the unloader and it seemed to be putting out a lot of air so believe the pump is good.

Think the problem lies with the unloader valve but wanted to ask before I started swapping expensive parts. Have never messed with a gas compressor before so am not exactly sure what is normal.

Any assistance would be appreciated. Thanks

John

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Ridgid Compressor Issues.

Discharge tube for OL50135W Oil Lubricated Wheeled Compressor

by Al McCall
(Summit, NY)

Hello

I am replacing the discharge tube on my Air compressor.

I received the tube fro ridgidparts.com The outside diameter of the tube is 7/16" (I think).

I need the plastic/vinyl ferrules that go on either end of the tube. The ones on the old tube were pretty much destroyed when I took it off.

Do you know where I can get these or an alternative fix. All I can find are either 3/8" (too small) and 1/2" (too big)

Thank You

Al
____________
Al, if the tube you are speaking of is the one from the pump head to the tank, the ferrules were plastic, they would have to have been high heat resistant.

If I have the right tube, you can probably find copper ferrules (and even a new tube) with the appropriate fittings at a good plumbing store.

It were my compressor, I would have no problem replacing the tube with a soft copper tube available from stock at many plumbing outlets.

Cheers,

Bill



Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Ridgid Compressor Issues.

Rigid 1.8 hp compressor - motor turns very slowly

by Paul
(Gillette, Wy)

Bill,
I have a Rigid 1.8 hp compressor. when you turn it on it does not spin quickly and build air. If I pull the cover off I can see the piston move up and down very slowly. What can I do?

Paul
________________
Paul, same scenario with the tank empty of air?

Are you using an extension cord?

Cheers,

Bill

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Ridgid Compressor Issues.

OL50145MW - how to get the switch cover off

by Gerald
(B.C. Canada)

I have rigid wheelbarrow compressor model OL50145MW.The compressor when plugged in does nothing.There is power to the plug and the on/off switch is in the on position.I want to check That the power is going through the switch but cannot figure how to get the switch cover off.

Click here to read or post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Ridgid Compressor Issues.