Question about Craftsman Air Tools & Compressors

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Inherited a 1988 craftsman compressor 919-156651. there's slow leak from the tank. Is that easy to fix?

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  • Craftsman Master
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Depends where it is
If it is from the bottom it may be a rusted out tank ( don't fix)
if it from around the weld for the boss ( rusted out -don't fix
if it is around a plug thread just reseal
remember that compressor tanks contain oil and water and welding before completely evacuating with nitrogen gas will cause an explosion

Posted on Oct 09, 2018

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Posted on Jan 02, 2017

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rlw626

  • 4 Answers

SOURCE: gas tanks leak bad

its not too bad a job , try to drain out the remaining fuel somehow to eliminate extra weight and chance of spilling fuel, remove filler tube connections that connect to the body , remove the straps that support the tank(s), lower tank(s) withhelp whenever possible, remove connecting wires to the float/fuel pump assembly, then replace with new tank in reverse matter, if have spare tire under tank just remove out of the way, also disconnect the battery to avoid any type of sparks when working around fuel fumes, actually not to hard of a job , just usually dirty and time consuming for the first time , also if you cant get the support straps to unbolt you can always cut them off and replace with new ones.

Posted on Oct 20, 2008

John Trevino

  • 1420 Answers

SOURCE: AIR LEAK ON CRAFTSMAN AIR COMPRESSOR, 3HP,25 GAL, HORIZ TANK

The needle valve that you see is the unloader which releases air pressure from the discharge line after set pressure is obtained. If air continues to leak after the compressor shuts off, the check valve installed in the tank is leaking air out of the tank. Follow the air discharge line from the compressor to the tank. There you will find a brass valve which is the check valve. Simple test is to remove the smaller airline (1/4") from the brass valve and check for air leaking. If leaking remove brass valve and check for debris under the white seat. If you cannot clean the valve, replace with generic check valve from www.grainger.com. It will cost less than factory part. Just order the valve considering the fitting sizes that you need. For exact replacement,( www.sears.com parts). If you sears model # begins with WL then your compressor is made by campbell hausfeld and parts may be ordered from www.chpower.com. Good Luck with you repair and email if you have more questions.

Posted on Mar 21, 2009

agent91

Ned White

  • 2100 Answers

SOURCE: Craftsman 3 Gal. Air Compressor 1 HP Hortiz

Does it run? Does it stop running? Does the pressure gauge read anything at all? Is there a regulator on it? Can you take the reg off? A bunch of things to check, get it running and let me know what you find, and I will try to tell you what's next.

Posted on Feb 27, 2010

bgavin423

  • 18 Answers

SOURCE: 25 gal horizontal craftsman air compressor is leak...

Unloader valve probably needs to be adjusted. Should be two jam nuts holding the unloader to the pressure switch. Loosen the jam nuts and adjust the unloader slightly away from the lever. Tighten the jam nuts and try it again.

Posted on Jul 10, 2010

willinois

JB Weld

  • 77 Answers

SOURCE: I have a 6 gal, 150 psi craftsman compressor.

This product manual will show the exploded view on how it comes apart/goes together:
http://c.shld.net/assets/own/00915216e.pdf

Posted on Jan 12, 2011

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1 Answer

Dewalt Emglo 55168 motor starts to slow down as pressure builds to about 30 PSI. It really starts to labor. Any thoughts as to what could be causing the motor to strain and slow?


Most likely in tank check valve is leaking or belt is slipping. Belt tension easy to check, should not deflect with thumb pressure. Check valve should not let air escape out of tank. Easy to check. Run compressor till pressure builds to around 50 psi. Then unplug machine from power outlet. Listen for air leaking out of tank. In bad cases, air will actually leak out of intake filter. Replace check valve as needed. Good luck

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This is usually caused by long extension cord, leaking check valve or weak capacitor. Most likely leaking check valve. Easy to check, run compressor for a couple of minutes and shut off. Listen for air leaking from pressure switch or at the intake filter. If leaking, let out air and remove check valve and look for debris stuck under the valve seat. To find the checkvalve, follow the air discharge tube from the head of the compressor to the tank. You should find a brass or chrome valve threaded into the tank. If check valve is not leaking, suspect weak capacitor or long cord (motor shop will test cap for free). Good luck

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Sources of noise from craftsman oil free compressors (could be Made by Campbell Hausfeld or Porter Cable) include loose fan, failing bearing/s on the piston rod and housing, failing seal ring on piston, air filter intake and loose motor mounts. With the housing cover off, check the fan blade for cracks or loose screw. Turn motor by hand till the piston is at top of stroke. Examine the cylinder for scratches close to top. If scratched, air is leaking past vinyl ring making noise and causing longer fill time. If everything looks ok, suspect noise coming from bearings. Hard to tell if bearings are failing by looking at them. I have seen many failures of the piston bearing on the crank (fairly easy to change, I use alternator bearing from auto parts ) , however, the bearing in the housing just behind the crank bearing is much harder to replacable. Good luck with your fix-it project.

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My Craftsman air compressor has wored fine till now. It does not want to build up pressure beyond 50 psi.yes I did check the drain valve and no leaks. Motor seems to be putting out the rpm's and the oil...


Check for a leak between you compressor head (pump) and your tank. Your pump output may be good but as your tank pressure gets higher the leak will not allow the tank to build up.

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1 Answer

I have an 80 gal Craftsman air compressor who just shut down, the pressure is dropping, it made a smoke smell and it blew my circuit breaker. I tried starting my circuit breaker but it kept flipping off....


Usually related to the in-tank check valve. Follow the discharge hose from the pump to the tank. At the tank the hose attaches to a brass valve (or metal valve). This brass fitting is the check valve. It's purpose is to hold air in the tank and not allow the air to load the compressor when motor is trying to start. Easy to test. Use another compressor to pump air into your tank thru the quick disconnect or remove the safety valve and install hose there. Pump in about 75 psi and looks for leaks with soapy water. Remove air inlet hose from check valve and check for air leaks. If leaking, replace with generic valve available at www.grainger.com or order from sears parts. If no leaks then suspect unloader is not working at the pressure switch. If both the unloader and check valve is ok then test capacitor for reading within 95% of rated valve. Good holidays

Dec 14, 2010 | Craftsman Air Tools & Compressors

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

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I have an upright craftsman compressor which is VERY slow at building pressure. The shut off is 150psi. When I use the unit, and it turns on, it runs forever to build back up, even when im not using it....


Your unit should fill within 5 min. Compressor may have worn cylinder (assuming oil-less) , worn valves or just leaking. Easy test. Spray soapy water on all connections/fittings including drain valve and regulator while compressor is running. Repair as needed. If no leaks, remove plug from outlet, remove cover and examine cylinder. Turn crank by hand till piston is all the way up into cylinder. Examine carefully the condition of the cylinder close to top. If the cylinder is scratched or worn then pressure is leaking between piston/cylinder and will not fill tank properly. Replacement cylinder kit available at Sears, cost under $50. If no leaks and the cylinder looks good, then valve plate may have broken gasket or reed valves. Replace as needed. Good luck with your project.

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1 Answer

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.

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1 Answer

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