I have a COLTRI MCH6 compressor, 3 horse power, single phase, 2.2 kW from 1998 (no pressure switch). I bought it second hand few month ago. I have to say that it is my first diving compressor, (I use to fill up cylinder from a filling station but I have not done any maintenance on it). However I have download, printed and read the manual of the Coltri and have respected all instruction in it.
This is what the previous owner wrote me about it : « I did all the normal things to service it. Then I rechecked the output volume it was down so I removed all the valves and replaced and refaced them (all stated in the auction), I even replaced the first stage rings as this is where the compressor gains its capacity from. I fitted a new low volume reed valve head and reassembled with new gaskets and synthetic oil. The compressor has been fully pulled apart, cleaned out and rebuilt it is in as new condition and I can assure you all parts were original and new.»
When I received it some oil had leaked during the transport. I have cleaned the outside, but I noticed the intake filter was soaked in oil as well, so I wiped the oil off and let the compressor run with nothing on the other end for a while. I checked the oil level before and it was good. I had a look at the belt, looked ok. Other than that, I admit the compressor looked new, and appart from the oil it was very clean. Could not expect any better for a compressor of this age.
I check oil level and safety valve before each day of work. I purge moisture every 7 to 10 minutes.I have been running it for less then 4 hours in total ( I keep track of every use ).
Now the problem that I have is that the compressor stop by itself randomly and I do not understand why. I believe it should do so if overheat, but today it did it after only 8 minutes if use ! It happenned 4 times in total. The first time I waited ½ hour and start again : no problem, I finished my filling. The second time, I waited 5 minutes started again without a problem and then it stopped after an other 10 minutes. I noticed that time some kind of white smoke coming off the intake hole. I did not start it again that day, and today. Starts fine, and stop after 8 minute of running. (went from 60 bar to 100 bar). What can it be ? What shall I check ?
I have tried an other socket but same problem happen. The compressor has no problem loading to 230 bar as it does so when I check the safety valve.
Thanks for your time.
This is what the previous owner wrote me about it : « I did all the normal things to service it. Then I rechecked the output volume it was down so I removed all the valves and replaced and refaced them (all stated in the auction), I even replaced the first stage rings as this is where the compressor gains its capacity from. I fitted a new low volume reed valve head and reassembled with new gaskets and synthetic oil. The compressor has been fully pulled apart, cleaned out and rebuilt it is in as new condition and I can assure you all parts were original and new.»
When I received it some oil had leaked during the transport. I have cleaned the outside, but I noticed the intake filter was soaked in oil as well, so I wiped the oil off and let the compressor run with nothing on the other end for a while. I checked the oil level before and it was good. I had a look at the belt, looked ok. Other than that, I admit the compressor looked new, and appart from the oil it was very clean. Could not expect any better for a compressor of this age.
I check oil level and safety valve before each day of work. I purge moisture every 7 to 10 minutes.I have been running it for less then 4 hours in total ( I keep track of every use ).
Now the problem that I have is that the compressor stop by itself randomly and I do not understand why. I believe it should do so if overheat, but today it did it after only 8 minutes if use ! It happenned 4 times in total. The first time I waited ½ hour and start again : no problem, I finished my filling. The second time, I waited 5 minutes started again without a problem and then it stopped after an other 10 minutes. I noticed that time some kind of white smoke coming off the intake hole. I did not start it again that day, and today. Starts fine, and stop after 8 minute of running. (went from 60 bar to 100 bar). What can it be ? What shall I check ?
I have tried an other socket but same problem happen. The compressor has no problem loading to 230 bar as it does so when I check the safety valve.
Thanks for your time.