Question about Dewalt D55146 1.8 HP Continuous, 200 PSI, 4.5 Gallon Compressor

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Air is leaking from regulator knob on my d55146 compressor. will a regulator rebuild kit fix it or do i need a hole new regulator?

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Yes. A rebuild kit will include all seals and o-rings needed.
This project is best handled at a service center...Reason being that the rebuild requires making sure that all seal surfaces are a clean machine surface to properly reseat and seal..

Posted on Apr 21, 2013

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Posted on Jan 02, 2017

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SOURCE: Dewalt Aircompressor model 55168 type 2 is leaking on small hole under the adjustment knob how do you fix it from constantly leaking?

Assuming your talking about the regulater it is repairable. first remove from comp. disassemble bottom needle valve and seat by simply unscrewing round cap on bottom of reg. check to see if the valve is hanging up . normally due to air comp. oil blow by. clean lubracate and check for o ring or seat damage. remove 4 screws from top of reg. first loosen adjustment knob to release spring tention once you remove make sure diapham isnt torn or damaged clean lub. reassemble bottom valve push the needle down to make sure it releases and works properly. reassemble top diaphram spring adjustment and cap test if the through cleaning doesn't work and in my experiance it does 85 % of the time you can buy a rebuild kit for it. hope this helps it is a simple repair

Posted on Feb 28, 2013

bandg963
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SOURCE: i need a manual for the dewalt 1.8 hp model d55146 air compressor i purchased today

Go online www.dewalt.com

Posted on Sep 03, 2012

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Dewalt Aircompressor model 55168 type 2 is leaking on small hole under the adjustment knob how do you fix it from constantly leaking?


Assuming your talking about the regulater it is repairable. first remove from comp. disassemble bottom needle valve and seat by simply unscrewing round cap on bottom of reg. check to see if the valve is hanging up . normally due to air comp. oil blow by. clean lubracate and check for o ring or seat damage. remove 4 screws from top of reg. first loosen adjustment knob to release spring tention once you remove make sure diapham isnt torn or damaged clean lub. reassemble bottom valve push the needle down to make sure it releases and works properly. reassemble top diaphram spring adjustment and cap test if the through cleaning doesn't work and in my experiance it does 85 % of the time you can buy a rebuild kit for it. hope this helps it is a simple repair

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1 Answer

Dewalt d55146 wont start


Not that I am aware of. The cord should go into a control box where the on off switch is. The motor wires come from that to the motor. I would check the switch box and more importantly the cover. The cover contains the plastic knob that turns the switch on and off. If the knob gets messed up it may not work correctly. The cover is available by itself. Here is a diagram with the part numbers.

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May not need to remove the manafold. Order regulator repair kit number (N008792) and try to repair in-place. If the knob is stripped, do not repair. Remove the knob and examine parts before you order kit. For a temp repair, remove the jumper hose that feeds the manafold and plug. Remove the safety pop valve and install a tee fitting. On one port of the tee, re-install the pop valve. On the second port install quick connect fitting for full tank pressure or generic regulator then quick connect. Generic regulator is sold at Lowes and will last longer then factory part (manafold costs about $75). Good luck

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Have dewalt D55146 air compressor leaking out of air pressure adjustment knob. What needs to be done? dgutierrez@versitech.com


first make sure the knob is turned fully clockwise (closed) and see if the leak stops, if it doesn't, the easiest thing to do is to buy the valve and replace it, it is difficult to near impossible to find parts for this valve.

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My regulator on my compressor keeps leaking from the top. When I turn on compressor it just keeps filling up in the regulator maxes out at 200psi and blows the safety valve. model D55146 type 2


Hello. W/D here.
Check the rating tag on the safety valve that is letting the pressure off of the tank. I'm pretty sure that it is less than the 200 psi that you are seeing.
What I believe is that the contacts in the pressure switch are either set too high, or the switch is bad. Check the rating for your switch, it's kick in (on) and kick out (off) pressures. If you have these values, you can set the switch yourself. Pump the pressure up to where you want it to kick out (off) and stop the compressor at that pressure by pulling the plug. Remove the contacts cover and adjust the spring until the contacts part, setting the contacts to the actual pressure. Drain the air down to below the kick in point. Replace the cap over the contacts, and turn the compressor back on. It should kick off at the pressure that you dialed in.
If the contacts will not set, or if there is too much carbon on the contacts, or if you note any burned wires or melted terminals, replace the switch. Minor carbon on the points can be removed with an emery board or fine sandpaper, and this should be regarded as a temporary fix.
Best regards, --W/D--

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Pressure regulator control knob leeks air and will not allow unit to reach cappacity


I assume turning up the pressure doesn't help. The regulator probably has a torn diaphragm. It will need replaced (i doubt you can get a rebuild kit).

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1 Answer

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i have that compressor and had that problem. i build professionally so i use it alot. i had it about a year before the regulator quit working which is what yours is doing. i put it back in the box and took it back to lowes


please rate answer

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