Question about Dewalt D55146 Factory Reconditioned 4.5 Gallon Electric Wheeled Portable Compressor, 1.8 Hp, 1750 Rpm

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Compressor question i've had a dewalt compressor D55146 for a while now and just recently the compressor started to stay running at all times and not much pressure was building in the line..... the pop off valve is not open, ive tryed to adjust the pressure adjustment knob up and down and to no luck...... any help would greatly be appreciated shilo please respond to impalassondubs@aol.com

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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


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Posted on Mar 21, 2009

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Posted on Jan 02, 2017

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Dewalt air compressor model d55146 motor brushes sparking bad brushes look good


Clean the spaces between the copper segments on the armature of the motor where the brushes touch. Put new brushes in it too.

Apr 16, 2017 | Dewalt Air Tools & Compressors

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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?


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..

Apr 20, 2013 | Dewalt D55146 1.8 HP Continuous, 200 PSI,...

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My dewalt D55146 makes loud leaf blower noise, has a burning smell and doesnt build pressure


This compressor is belt driven. When the belt fails the motor will run faster than normal and takes longer to stop turning. When belt is in place and the motor is shut off, the motor will stop almost instantly. If the belt is slipping, you will smell rubber burning (you will need to change the belt anyway). It is my opinion that the belt fails because the cut-off pressure is much to high (200psi). The belt will last longer is the pressure switch cut-out at a normal 125psi. If the discharge tube (tube from pump head to tank or in-tank check valve) or other parts are leaking, it will take much longer to fill and cause over-heating. You can keep track of the condition of the compressor internal parts by knowing how long it takes to fill the tank when new compared to how long it takes now. As parts wear, the unit will take longer to fill. Go to the dealer and time a new unit then test yours against this time period. Do not use an extension cord on this size compressor. Use more hose instead. If you are having trouble filling the tires because of low pressure in the hose, try experiment. Remove the safety valve from the compressor and install a tee fitting. One one port of the tee, reinstall the safety valve. On the second port install a quickconnect fitting. This will give you access to full tank pressure bypassing the regulator to quick fill your tractor tire. This trick is how the tire shop quickly fills a tire. Use caution and do not overfill your tire. Good luck

Apr 11, 2013 | Dewalt D55146 Heavy Duty 412Gallon 200PSI...

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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.

DeWalt D55146 diagram

Aug 20, 2012 | Dewalt Air Tools & Compressors

2 Answers

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--

Feb 19, 2011 | Dewalt D55146 Factory Reconditioned 4.5...

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