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compressor engine will run but no pressure will build in link removed here any leaks and drain cock is closed.air is flowing out of exhaust.any suggestions to fix myself
Hi jem,
The upper chamber on that compressor is separated by a very thin Valve Seat To Head Gasket Part Number: 211001-E.If the center part of the gasket blows out, the compressor head will keep blowing air but at the first sign of resistance( air building up in the tank) air pressure will bleed into intake chamber until it equalizes pressure and no more air will flow into the tank.Take the head bolts off and remove the head and inspect the gasket. If it is broken and you replace it be sure to re torque the head bolts after a couple of hours of use to prevent it from blowing out again.Hope that helps.Good luck.
Tinker
Reply: Makita Mac5200
jem
thanx tinkerdave.the valve seat to head gasket was ok but had a very small pebble logged in the gasket.removed & cleaned.operating perfect now.this site has been saved to my favorites.
rgy678,
To trouble shoot the compressor we will need a little more information."Compressor with air gun attached drops from 125 PSI to 40 PSI" are you saying the compressor only pumps up to 125 psi and won't turn on again until it hits 40 psi ?
Tinker
Reply: Makita Air Compressor Mac5200
rgy678
I should've been more clear; w/o air hose attached to the compressor, the pressure will stay at 125 PSI. Attaching the hose, the pressure drops off immediately to 40 PSI.
Reply: Makita Air Compressor Mac5200
Tinkerdave
hi rgy678,
The mac5200 has two pressure read outs. One gives tank pressure and the second gives output working pressure.Is it the second one (working pressure)that shows 125 psi without the hose connected but drops to 40 psi when you connect the hose?If this is the case then the spool valve is sized in the regulator body. The pressure regulator Regulator Part Number: 410029-E needs to be replaced.Hope that helps.Good luck.
Tinker
I CAN'T FIND THIS PART. IS THERE A PART # FOR IT AND, IF SO, COULD SOMEONE LET ME KNOW? IS THERE A WAY TO BYPASS IT? THIS SWITCH IS A REAL PAIN IN THE A--.
I service Makita tools for a Building Supply firm. Our contractors have trouble with the MAC5200 Air compressors not wanting to start in cold weather. The compressors trip the thermal overload breaker on the motor and after resetting the breaker several times, the breaker becomes weak and will not allow the compressor to run even in warm weather. I have had to replace several breakers because of this problem. Does anyone know of a solution for this cold start problem? Has anyone tried a synthetic or light weight oil and does it help when starting in cold weather. We see this problem at 30 degree F or lower...
I service Makita tools for a Building Supply firm. Our contractors have trouble with the MAC5200 Air compressors not wanting to start in cold weather. The compressors trip the thermal overload breaker on the motor and after resetting the breaker several times, the breaker becomes weak and will not allow the compressor to run even in warm weather. I have had to replace several breakers because of this problem. Does anyone know of a solution for this cold start problem? Has anyone tried a synthetic or light weight oil and does it help when starting in cold weather. We see this problem at 30 degree F or lower.
There is a lighter weight oil for compressors available (10w instead of 30w). The other problem that a lot of people have with compressors is running them on cords that are way too long and not of sufficient gauge to handle that amp. draw at start up especially in cold weather.
Question:
davada
It seems that the part I need in not on the parts list. It is the pressure regulator that you can dial the amount of pressure you want to maintain.
i have a makita 5200 air compressor. i use daily for construction. the unit has been building water/moister in tank for a while now getting more and more. and today it wont pump past 80lbs and just keeps running has bad smell from water in tank. i cant really hear a leak.
would anyone know what it may be and what part/parts i need to fix it?
edit: when i shut it down it has a rattling noise at fan/motor
Well, the smell from the tank is a concern but it shouldn't affect the pressure in the tank. I'm wondering if the piston and rings are going bad, That would explain the poor compression. If oil is getting past the piston ring that could explain the bad smell. Also if your air filter is clogged, it will cause oil to be pulled past the piston rings into the tank. I would definitely check the filter and if it's clean, you're going to have to look at the piston. Here's a link to the Makita MAC5200 parts breakdown for reference: