20 Most Recent Craftsman 1 hp Air Compressor, 4 gal. - 16638 Questions & Answers


If it's new I would return it. However that model number 16638 is for a Huffy Bicycle.

Craftsman 1 hp... | Answered on Sep 06, 2014


check air tank drain valve located on bottom of tank, if it is not leaking try adjusting air pres regulator (large black knob close to air hose connection.) the knob when turned in will increase the tank air pressure, if knob wont turn check that lock ring on bottom of knob to make sure it is disengaged. also check for air leaks in all lines and connections

Craftsman 1 hp... | Answered on Apr 17, 2012


Sounds to me like the setting on the compressor are set to high, there may be an adjustment on the pressure switch to set it at a lower restart pressure.

Craftsman 1 hp... | Answered on Dec 16, 2011


Well if the device only gets to 20 psi.I would wonder if perhaps the inlet pressure valve/sensor wasn't faulty or stuck? Or maybe you have a "Leak" somewhere? either in the connection between the pump and reservoir, or even perhaps the reservoir is leaking. if you suspect leakage, use soap bubbles, to check, lather them around suspected connections etc, and see if there are any leaks?
Basically we have a reservoir a pump, and an air inlet, and a pressure sensor, that cuts off, when a certain pressure has been reached, if it isn't working, then we simply have to find out why? if the motor is working, then it is pumping, the air should be being forced into the reservoir through a one way valve, that "Cuts off" at a certain pressure.
So when we troubleshoot, we simply need to check each part as it were, and by the process of elimination isolate the bad component and replace it.

Craftsman 1 hp... | Answered on Oct 31, 2011


1) Check that it is not already at full pressure
2) Check that you have power coming in to the switch (20 year old power cord)
3) Bypass the switch and, briefly, plug it in.
4) Look for a fuse or breaker.
5) With the motor leads disconnected from the switch, check that you have resistance across the motor (0 ohms would be bad).

If you are not comfortable doing any part of this, don't. Check with friends & neighbors for a reputable local appliance repair company.

Craftsman 1 hp... | Answered on Jun 13, 2011


you may have a seal in the head that is blown out or a diaphragm problems start by taking the head off and inspecting their

Craftsman 1 hp... | Answered on Feb 24, 2011


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.

Craftsman 1 hp... | Answered on Feb 06, 2011


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

Craftsman 1 hp... | Answered on Jan 29, 2011


replace the faulty poppet valves in the compressor heads

Craftsman Air... | Answered on Jan 25, 2020


Take it back to the shop as it is under warranty and working on it yourself will void it.

Obviously, make sure you have read the manual carefully.

Craftsman Air... | Answered on Jan 15, 2020

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