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I have a 1hp 7gal that makes just 40lbs keeps running and gets hot. took the head off suspecting the reed valves but every thing looks like new in there. There was a small amount of blue sort of sealant looking stuff on the reeds that I cleaned off but it made no difference

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If this is piston driven you need new rings if rotary then you need new air inlet valve unless you have oil in air line then it would need bearings and seals

Posted on Jun 22, 2009

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1hp 7gal. pumps air, will not fill tank,zero on gauges any help?


could be the non return valve at the end of the compressor pipe into the tank
more than likely the reed valves , poppet valves in the head of one or more cylinders and that is allowing the air compressed to pass between cylinders and not to the tank
if it is a single cylinder then it will be the valves in the head

Mar 03, 2016 | Air Tools & Compressors

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My blaster runs good but once it gets hot it revs up and wont stop i cant stop it with the run switch or the key i block the air to turn it off i put a new plug in it it has the oil pump off i mix the gas...


Sounds like an air leak... either at the base gasket or the reed valve gasket. or the carb/reed intake boot...MAYBE THE HEAD GASKET...

...AND ... get a qualified pro to look at your carb..tell him which parts you replaced...

Aug 06, 2017 | Yamaha 2004 Blaster Base

1 Answer

I took top of compressor off and the 2 plates that have 2 small brass plates that seem to fit into a groove on the 2 plates but cant seem to figure the correct assembly for the plates and brass plates.


The link below is not exactly like your compressor but will give you an idea of how heads are assembled. If gaskets need replacing try making them out of automotive gasket material or use the metal from aluminum soda/beer can. If you need to replace a reed valve, make it out of feeler gauge material. The reed valve needs a little wiggle room to work, try to use gasket material of same thickness. There are two chambers in the head (upper most part), one chamber is intake the other is exhaust. The intake valve is usually slightly cleaner looking than exhaust valve (exhaust valve gets hotter, looks burned) and exhaust chamber in the head is usually darker sometimes oily. Intake reed is closer to piston. Exhaust reed is closer to top of the head.

http://www.ereplacementparts.com/campbell-hausfeld-dp400000av-2005-air-compressor-pump-parts-c-32345_32355_33008.html

Oct 31, 2011 | Northstar Air Compressor Pump - 5 HP, 15.9...

1 Answer

Hitachi Ec 119 compressor will not build pressure beyond 25 pounds; no air is heard leaking after I power down the machine. Is it likely the check valve or pressure switch?


If your compressor keeps running and only builds to 25psi, I would suspect the reed valves, head gaskets or a leak. With the compressor running spray soapy water on all fittings, around the head area and tank components. If no leak is found, remove the air filter and feel for suction at the intake(make sure head is not too hot). If you feel good suction at first then suction is lost after reaching 25 psi, most likely reeds or gaskets (with bad reed valves, sometimes you will actually feel air blowing out of the intake). Good luck

Oct 15, 2011 | Hitachi EC119SA Twin-Stack Air Compressor...

1 Answer

Compressor will run, but only builds to 20 lb pressure. Line to tank gets hot.


Very hot air is an indication of leaking /broken head gasket or reed valve. Before you remove any parts, with compressor running, check all fittings for leaks with soapy water. If no leaks, remove head and examine parts. If reed valve is broken replace as needed or do creative repair. Some valve plates have multiple reeds and only one reed is broken. Depending on your skill level, you can thread the hole and seal with piece of bolt (finished repair must not be any thicker than the plate). Good luck

Jan 29, 2011 | Craftsman 1 hp Air Compressor, 4 gal. -...

1 Answer

I have a ch 28 gal (wl611700aj) air compressor,it pumps up to 80 psi.wont pump up any further but does keep running.whats your thoughts?


Here are a couple of things to check. While the compressor is running spray soapy water on all airlines, fittings, bottom of pressure switch, regulator and drain valve to make sure that they are not leaking. A small leak will prevent the unit from reaching cutout limit. Repair as needed. Next unplug compressor and remove cover to expose cylinder and piston. Move piston to top of cylinder and check for scratches or wear neer top of cylinder. If scratched, air is bypassing piston ring and will not reach cutout pressure. If cylinder looks good and no leaks then problem most likely is valve plate/ reed valves or head gasket. Problems within head will cause low pressure and air line to tank will be very hot. Bad reed valves will also cause air to blow out of intake when it reaches 75 to 80 psi. Parts are available at www.chpower.com or at www.toolpartsdirect.com. Good luck

Sep 11, 2010 | Campbell Hausfeld 26 - Gallon Air...

1 Answer

My Makita MAC2400 air compressor keeps blowing the circuit breaker. The circuit breaker to the compressor not the one for the house. It will only run for about 15-20 seconds before the breaker pops. I have...


Your compressor should fill within 5 min or so. Here are a few things to check. As compressor is running check all air connections/fittings with soapy water (including regulator, drain fittings and quick connects). Repair as needed. If no leaks, unplug compressor and listen for air leaking from check valve at tank (remove 1/4 airline at checkvalve, brass valve at tank). Replace checkvalve as needed. If no leak at checkvalve, problem most likely valve plate in head of pump. The valve plate has two reed valves that sometimes break. Bad reed valves will cause compressor head to become very hot and discharge air will be hot. Replace as needed. Parts are available at www.toolpartsdirect.com. Good luck.

Aug 05, 2010 | Makita MAC2400 Electric Powered Air...

2 Answers

I have a craftsman 1hp 4 gal compresor. It's not building pressure and air is pumping out of the air filter not in???


sounds like reed valves are bad,sometimes you can take the reed valves and flip them over for short fix,best to put new one in unit.

Jun 27, 2009 | Craftsman 1 Hp, 4 Gal. Air Compressor

1 Answer

Drops compressiom from 120-60 psi after 3 new pressure switches


When the pressure switch fails the comperssor will overpressure to the point of safety release at about 150 - 160 psi. It sounds as if your compressor is not producing enough pressure to cycle off at 120 and just keeps running. This happens when air is leaking from fittings or worn cylinder / reed valves. Don't worry, with some simple tests we will find the actual problem. I am assuming that your compressor is oilfree type. If there are leaks the compressor may not reach set pressure. I use soapy water on all connections and on the head/headvalve (remove plastic covers to get to all parts that may leak) while compressor is running. Make repairs as necessary. If still low pressure, while compressor is running and has reached max obtainable pressure (in your case 60 lbs), carefully place finger over intake port hole (remove filter). If the compressor is pumping normally but leaking there will be ample suction at intake and cause the compressor to speed-up when intake is obstructed with finger. If you feel plenty of suction and no visible (soapy water) leaks, then the problem is probably the cylinder /ring is not correctly seating /scratched and air is leaking past cylinder. Make sure that the cylinder /piston ring is properly aligned and that the lip on the vinyl ring is up toward the head. On oilfree compressors you can examine the cylinder by pushing the piston all the way up, then look for scratches neer top of cylinder. If scratched, pressure is leaking past cylinder, install cylinder kit. If you do not feel suction but rather air blowing out of the intake, (do this test when tank has reached 60 psi) then the problem is the headvalve plate/reed valves are leaking. The reeds must seal perfectly on their seats and not be bent or have obstruction. Replace as necessary. If reeds or headgasket is leaking the discharge air will be very hot. Only one other thing to check and that is the intank check valve. Easy to check. Run compressor till you have about 50+ lbs in the tank then unplug compressor. Carefully loosen the inlet hose at checkvalve and listen for air leaking out of tank. (check valve is the brass valve at tank) If leaking replace checkvalve. Use caution when removing head to try and save the gaskets. If you have oil type pump, and no air leaks (soapy water test) suspect reed valves/valve plate. Good luck on your repair and email if you have other question.

May 06, 2009 | Campbell Hausfeld 28 - Gallon Air...

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