Question about Hitachi EC89 4 Gallon Twin Stack Air Compressor

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Air discharges. Tank Will not hold pressure - Hitachi EC89 4 Gallon Twin Stack Air Compressor

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There a leak att the intake or outlet take soapy water put on both sides c if it makes bubles

Posted on Apr 04, 2011

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Compressor leaks after pressure is built up


The problem that you describe is more likely the check valve. Follow the air discharge tube from the pump to the tank. The brass or aluminum fitting at the tank is the checkvalve. Clean debris in valve or replace valve with generic. Should cost about 20 dollars. Make sure that the air discharge tube is clean of carbon deposits so that the new valve will fail. Good luck

Mar 18, 2013 | Air Tools & Compressors

1 Answer

After compressor turns off it leaks air from pressure switch


Sounds like you have a tank check valve leaking. It is located in top of the tank. The copper discharge line from the compressor goes into the check valve. Make sure there is no air pressure in the tank. Then Remove the large copper discharge line. Also remove the small copper line from the side of the check valve. Once the lines are removed you can remove the check valve. Most of the time the check valve needs replacing. Sometimes they have large pieces of trash holding them open.

Aug 31, 2011 | Ingersoll Rand Ingersoll-Rand 80 gal. Air...

1 Answer

Air is leaking from the small air line under the power relay. the valve in the small is melted.how to repair.how to find parts? /


Air continually leaking from power switch/ unloader indicates that in-tank check valve is not holding pressure. Easy to check, follow discharge hose from pump to tank. Brass valve at thank is the check valve. With air in tank and unit unpluged from outlet, remove hose from valve and check for leak, replace as needed. Parts are available at www.chpower.com Good Luck with your repair.

Aug 29, 2010 | Campbell Hausfeld Maxus 60 Gallon (Belt...

1 Answer

My compressor builds to 125 psi then shuts off like it should then when the pressure is released the compressor wont start back up. Sometimes it will attempt to start and it sounds like the motor is...


When a compressor reaches set pressure, there should be a release of air from discharge hose thru the unloader. This release of air unloads the compressor head pressure. The unloader is usually located within the pressure switch. Easy to check. Follow discharge hose from compressor head to tank. There should be a brass/steel checkvalve at the tank. The checkvalve allows air to enter tank, however not allow air to be released back into discharge hose. If this valve is leaking, air will be released from the unloader constantly. Follow 1/4" tubing from checkvalve to unloader and listen for leaks. Repair as needed. If air is not leaking from checkvalve then check unloader mechanism with-in pressure switch. Parts are available at www.toolpartsdirect.com Good luck

Aug 25, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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Single cylinder/oil free 5.5hp 30gal will fill tank when started with tank empty. When tank pressure is bleed off motor attempts to start, humms and kicks breaker.


If the unloader is not working properly the motor cannot overcome the head pressure. Two things to check. Make sure tank check valve is not leaking. Easy test. With pressure in tank, unplug the compressor from outlet and remove discharge hose at tank and listen for leak or spray soapy water. If leaking replace valve or try to clean debris from valve seat. If not leaking then problem is most likely at pressure switch unloader valve. Follow 1/4 inch hose from checkvalve at tank to connection at pressure switch. When pressure switch reaches cutoff pressure the switch opens the contacts and moves small tang against valve stem to release air from discharge hose. Check for proper function and repair as needed. Good luck.

Aug 18, 2010 | Craftsman Air Tools & Compressors

1 Answer

Ingersoll Rand Air compressor loosing pressure


sounds like you have a problem with the discharge valve on the secondary cylinder, some I.R. pumps rely on the cylinder head valves to hold back tank pressure when the pump comes to a stop. the line down to the crankcase in front of the crank is a unloader valve that dumps the air pressure inside the pump to allow the next restart. I think that once you drain the tank and remove that cylinder head you will find a defective valve in the head.

Mar 24, 2010 | Ingersoll Rand Air Compressor Maintenance...

1 Answer

Compressor wont restart because of head pressure


Piston air compressors have to unload to permit a restart, the two mot common types are an unloader valve or free air unloaders.

with an unloader valve this system uses a check valve mounted in the discharge line as it enters the tank, when the pump stops this check closes and does not permit the tank pressure to return to the pump. a unloader valve also opens to allow air pressure in the discharge line to vent, this valve is either on the pressure switch or on some models is on the pump, and is a centrifugal type.

Free air unloaders or head unloaders are a set of fingers that hold open the intake valves on the cylinders to permit the piston not to pump air against a head load, and once the pump is running the fingers retract to allow the pump to function as normal.

Jan 19, 2010 | Air Tools & Compressors

1 Answer

Air compressor - pressure problem


'When the machine is shut off, disconnect the discharge line out of the head of the compressor. If air releases, replace discharge check valve in tank.

Mar 30, 2009 | Air Tools & Compressors

1 Answer

Coleman Powermate Model Number BV6548049, pressure switch leak.


Usually, a leak at the pressure switch unloader valve is caused by the checkvalve in the tank. The unloader valve at the pressure switch bleeds out the air from discharge tube after compressor reaches set pressure. This only takes a few seconds. If air continues to leak then air is leaking back into the discharge tube past the tank checkvalve. Follow the air discharge line from the compressor to the brass valve at the tank. The brass valve is the checkvalve that holds the pressure in the tank. There are usually two connections at this valve. One is the unloader tube to the pressure switch. Simple test for leaking checkvalve, with pressure in tank unplug or switch off the compressor and remove the small unloader line at the checkvalve(brass valve) and look/listen for leak. If leaking, remove the checkvalve and examine seat/check for debris keeping the valve slightly open. If it cannot be cleaned, order generic replacement from www.grainger.com. It will cost less than the factory checkvalve. Just pay attention to the thread sizes for easy fit. Good Luck on your repair and email if you have questions.

Mar 25, 2009 | Coleman Powermate 60 Gallon Air Compressor

1 Answer

Makita MAC2200 runs fine (with new Manifold Switch and repaired power cord) but there is an air leak under the new manifold switch that seems to be a feature of the switch. When set to automatic, the...


I have worked on many makita compressors and have run-across this problem on a few of them. Your compressor has a check valve that is supposed to hold tank pressure after the switch reaches set pressure. There is an unloader valve built into the pressure switch that releases the pressure in the discharge hose after the unit shuts off. The unloader allows the compressor to restart with-out any pressure in the discharge line. If the brass check valve is leaking pressure back into the system, air will leak out of the unloader valve. Follow the discharge line to the tank and you will see the brass check valve. To test valve for fault, run the compressor till it builds around 80 psi and unplug the unit from the wall outlet. Remove the 1/4" hose connector from the check valve and check for air leaking out of the valve. If it is leaking you can order form www.toolpartsdirect.com. or call the makita 1-800 number. The price is about the same. Good Luck on your repair.

Mar 18, 2009 | Makita Air Tools & Compressors

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