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You could do a little searching on the web, and answer your own question. You can buy a manual for $4.95 at:
But worse, you don't even need an answer to this question. Simply add oil until level is about half-way up the sight glass. And don't overfill. How simple is that?
Sources of noise from craftsman oil free compressors (could be Made by Campbell Hausfeld or Porter Cable) include loose fan, failing bearing/s on the piston rod and housing, failing seal ring on piston, air filter intake and loose motor mounts. With the housing cover off, check the fan blade for cracks or loose screw. Turn motor by hand till the piston is at top of stroke. Examine the cylinder for scratches close to top. If scratched, air is leaking past vinyl ring making noise and causing longer fill time. If everything looks ok, suspect noise coming from bearings. Hard to tell if bearings are failing by looking at them. I have seen many failures of the piston bearing on the crank (fairly easy to change, I use alternator bearing from auto parts ) , however, the bearing in the housing just behind the crank bearing is much harder to replacable. Good luck with your fix-it project.
Two probably causes are: 1. Too much oil in the crank case. Compressors don't have a lot of oil in them and the oil level must be at the full mark on the dip stick or sight glass. Over filling it will make the motor work harder and some oil will get forced out the vent cap. 2. You may have compressed air going into the crankcase causing oil to get blown out the vent cap. This occurs if compressed air is getting past the piston, either through a hole in the piston or past the rings because either the rings or cylinder are damaged.
Alot of the older units did not have a sight glass. They had a dip stick on the fill plug. Over the years they broke off or the oil fill plug was replaced with a newer type that does not have the dip stick. To answer your question dip stick or not I always fill with oil to the bottom of the threads on the fill plug. You should remove the plug and check the oil level before each use on and older unit like this until you have a good handle on how much oil it uses. you may also be able to remove a plug usually on the front of the case lower left side and install a sight glass or low oil level switch. Have a good day!!
I've been working on air compressors for a while now and so far haven't found any that give a specific amount of oil to put in the air pump crank case. They all have one of two methods to get the oil to the proper level. First, and my favorite, is a sight glass at the bottom of the crank case. About the size of a quarter, it lets you see how much oil is in the pump as you add it. Usually they have a red center dot which is where you want the oil level. A little over or under is OK but the sight glass should not be completely full or completely empty, both are hard on the pump and drive motor. Another method is a dip stick usually on the end of the fill hole cap. Only bad thing about these is you have to put in some oil, check the oil level with the dip stick, then add more oil and check it with the dip stick until you get to the full mark. Again, not over and only a little under is where you want the oil level.
Without knowing what make or model you have, check the following:
1. Some, not all, compressor dip sticks have venting holes for the crankcase. If the vent holes are plugged or the check ball is stuck the dip stick will get forced out when the piston comes down.
2. Make sure the oil level is where it's supposed to be. Too much oil in the crankcase will cause the motor to work harder and the excess oil being splashed around the crank case can overwhelm the vents in the case or dip stick and again blow the dip stick out.
3. Worst case, you have worn or broken rings on the piston(s), a hole in a piston or a badly scored cylinder(s) and air is leaking past the piston and creating pressure in the crank case and blowing the dip stick out.
A 2475 has no way to tell how much oil is in it other than removing the oil fill plug and looking unless a low oil level switch has been installed. You should fill this unit to the bottom of the oil fill plug threads. It's less than 2 quarts. IR does have a spec sheet that tells the exact amount. I don't have it available right now!
In the owners information your compressor takes the 1 bottle of IR oil that comes with it. If you have a local tractor supply company or another company who carries IR you might check with them, it is the only oil i would recommend for your unit.
hi mate it is probably due to too much oil and when it starts the oil inside is splashed out the oil cap i reccomend start the compressor and let it run for 2 mins to get the oil warm take the plug out and drain the oil and the refill with p68 oil and on the oil sight glass refill it untill it reaches the red dot in the middle if it has one or on the dip stick it has a measurement good luck