Oil change 4 hp 20 gallon craftsman compressor
- Thread starter Cadmandu
- Start date
mike93lx
ALLIANCE MEMBER
A picture of the pump would help.
My assumption is that is an oil free, but it's not possible to tell with the pics you provided
My assumption is that is an oil free, but it's not possible to tell with the pics you provided
I got the manual and it said t the plug below is the dain and the plug above is the fill plug. How do you put 16 ounces of oil in at that height.
With a funnel?
Seriously, why not try draining it and filling it with the recommended oil and see how much it takes. you might be surprised how much it holds in the little space when it’s spread out over the entire area of the sump.
With a funnel?
Seriously, why not try draining it and filling it with the recommended oil and see how much it takes. you might be surprised how much it holds in the little space when it’s spread out over the entire area of the sump.
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demarpaint
Well-known member
Exactly. Just make sure it is on level ground when you service it. You'll be surprised how much oil they hold.
mike93lx
ALLIANCE MEMBER
240v? Why?
That doesn't just have a 15a 120v plug on it?.. Don't think for a moment that is actually 4hp
That doesn't just have a 15a 120v plug on it?.. Don't think for a moment that is actually 4hp
mike93lx
ALLIANCE MEMBER
Retracting my post completely
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The wiring diagram on the motor shows 2 pole only wiring. This unit is at least 25 yrs old and is probably only 2 1/2 working hp nut does require 240 even for that rating. It has a 919. ****** model number so it was built by DeVilbiss. I paid 135.00 for it and it came with 2 25 ft hoses
Edit: Looks like it is a 240V plug, see two posts below this one.
That's a 20A 120V plug. Do not plug that into a 240V outlet. While most 120V compressors are designed to work with a 15A circuit, that model is clearly intended to only work with 20A circuits hence the 20A plug. If your wiring is 20A (rather common) then you can change the wall outlet to a 20A version. Do verify that all the wiring is 20A. When I moved into my current house the visible wiring in the garage was all 12G and the wall breaker was 20A but the place where the wiring tapped into the house wiring was old ungrounded 14g stuff. This is not something you want to run on poorly done 14 gauge wiring.
That's a 20A 120V plug. Do not plug that into a 240V outlet. While most 120V compressors are designed to work with a 15A circuit, that model is clearly intended to only work with 20A circuits hence the 20A plug. If your wiring is 20A (rather common) then you can change the wall outlet to a 20A version. Do verify that all the wiring is 20A. When I moved into my current house the visible wiring in the garage was all 12G and the wall breaker was 20A but the place where the wiring tapped into the house wiring was old ungrounded 14g stuff. This is not something you want to run on poorly done 14 gauge wiring.
Leviton 20 Amp 125 V Commercial Grade Duplex Outlet/Receptacle, White (1-Pack) CBR20-W R62-CBR20-00W - The Home Depot
The Leviton 20 amp Commercial Duplex Power Outlet designed to withstand abuse and resist impact. It features a heavy-gauge steel strap that is rust resistant. It is an UL and CSA listed product and helps
www.homedepot.com
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Jswain
Well-known member
Pretty sure it's 20amp 240v unless his photo is mirrored
Compare it to the photo you posted and the vertical and horizontal legs are opposite
Compare it to the photo you posted and the vertical and horizontal legs are opposite
TRWham
Well-known member
Looks like a NEMA 6-20P to me and the label says 15 A 240 V
claymont
Well-known member
I've had this same compressor model since '78. I run on 240v; all I've done to it is change the oil a couple of times; I use a 5w- 50 synthetic because I had a surplus of it and the compressor is in an unheated outdoor space. There's a felt filter pad on the inlet that I clean when I change the oil. Only repair I've had to do is replace the discharge check valve which is located at the end of the discharge line going into the tank. When it fails, the motor will likely trip when trying to start. If you hear a continuous hiss of air at the pressure switch after the compressor has built up pressure and stopped, that's a sign that the check valve has failed. A couple second hiss is normal at cut-out, that's to 'unload' for the next start.
claymont
Well-known member
Not sure, I bought mine used in '78. Supposedly used to paint his house then he sold it.
I have the same compressor hasn't been used in 20 years ago. Looks new when it builds up 20psi head pressure, it shuts off before the uh pressure switch builds up the pressure to automatically kick off. Any suggestions
mike93lx
ALLIANCE MEMBER
Start a new thread with more detail