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Makita MAC700 Air Compressor Parts
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Discussion for the Makita MAC700 Air Compressor
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Question: Air Compressor Stopped Working
I'm trying to find out what happened to my air compressor. It suddenly stopped working. It wasn't overheated and the breaker didn't trip. I had it plugged into the same extension cord than the table saw, which I used at the same time. Later I noticed that it had double the amount of oil in it.
Question: Oil In The Air Tank
I purchased a new Makita mac 700 just over a year ago. I followed the break-in procedure in the manual and used it very lightly (a few hours actual run time). I recently got it out and noticed the oil level was very low. I opened the drain valve and oil drained out of the air tank. Is it possible the rings never sealed? Could doing the break-in procedure again still seat the rings properly?
Question: Pressure Switch Unloading Valve
Every so often when my mac700 is building up pressure and reaches the cut-out point, the valve on the side of the pressure switch (I think it is called the pressure switch unloading valve) seems to stick open and lets air pour out. Therefore the motor runs continuously and never shuts off. Is this a common problem and do I need a new pressure switch or should I adjust something on the valve?
Reply: Pressure Switch Unloading Valve
It does not sound like a problem with the unloader valve, but rather the check valve. If the check valve on the tank is not functioning, it will allow air to keep flowing out through the unloader. The unloader is supposed to only dump air off the top of the piston head to allow for easier starting. After the compressor has stopped running, the only way for air to get to the unloader valve is through the check valve.
Question: Slow To Build Pressure
Hi My MAC700 is slow to build up pressure (20 minutes to 120 psi). The previous owner said he put too much oil in it. Any idea what the problem could be? Valves?
Reply: Slow To Build Pressure
Had a similar problem. My Mac700 went from 0 to 120 psi in about 45 sec. (when new) to 2 min 9 seconds. (after three years of service) I brought the valve kit and replaced them (didn't bother to change the dowel pins, afraid I'd do more harm that good trying to pull them) It now goes from 0 to 120 is 1 min 12 sec. I accept the longer time (as compared to a new unit) as normal wear in the remaining parts.
Be cheaper to buy a new unit and replacing them.
Question: Mac 700
Patrick Bernal. Question, compressor will come on, fill to 105psi after drawn down it will bog down and kick out the breaker. when the presser is down and the reset button is pushed on it will start again.
Reply: Mac 700
Sounds to me like the unloader valve on the side of the Pressure Switch is not working properly. It is supposed to dump the pressure on top of the piston assy to allow for easy starting.
Review: Makita - MAC700
This is a great compressor, except for 1 thing. It's quiet, uses very little electricity, and makes a lot of air for the short time it runs. My only beef is that Makita does not sell replacment parts, they only sell replacement components. The air regulator started leaking after 1.5 yrs, and needs a new rubber seal, which is not available. They'll gladly sell a replacement regulator for $36 but not the $.50 seal. Sounds like the auto industry, making most of their money on parts and service.