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Oil Burner Motor Coupling Beckett Oil Burner Repair

If you oil burner motor is running and you are not getting any oil from the nozzle, the motor to oil pump coupling may be bad.

On most any oil burner there is a coupling that connects the motor to the oil pump.
This coupling is made of a hard rubber and will over time deteriorate and either break completely or strip out. The replacement of this coupling is a fairly easy repair, if you know how to do it.

First off a new coupling must be obtained. The best place would be the local HVAC Supply House. The coupling that you will get will not just fit the way it comes usually.
It will have to be fit to size and the right size shaft adapter placed in the ends. So don’t worry if it looks a bit funny, we will fix that.

The first you need to do (after turning off all power) is to remove the oil pump. On most oil burners it is the black square thing on the left side. There are two bolts at the three o clock and nine o clock positions that come out to release the pump. The coupling may or may not come with the pump. If it doesn’t then you will need to take pliers and pull it off of the motor shaft. Sometimes the coupling will come and leave the adapter on the shaft and you will just need to remove that. It can be tricky to get back to it.

Carefully measure the old adapter and cut the new one the same length. Choose the adapter you need to fit the motor shaft and the pump shaft. Insert them into the ends of the coupling. Place the coupling on the motor shaft and then carefully install the pump and tighten the bolts down. After tightening check the fan under the transformer and make sure that it turns freely and that nothing is binding. If the new coupling is too tight the motor cannot turn it and if it is to loose the coupling will wear out quickly. So be sure to carefully check everything to make the new coupling last a long time.

Now you can restore power and start the unit. It is best to verify the combustion of the unit with a combustion analyzer to ensure efficient operation and good combustion so that your unit does not soot up and lose efficiency later. Running your oil burner too lean or too rich can cause many problems both now and down the road.

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my oil burner trips the m.c.b, what is the cause?

Commonly Reported HVAC Problems: [Copyright © 1996-2011. Hannabery HVAC. All rights reserved.]That would be the little red button on the box at the oil burner itself. If your oil burner stops running the first thing you should check is the reset button. If you press it and the burner fires up then that was the problem. If the button should trip again then there is a definite problem and you should schedule a service call immediately. Do not keep resetting the button and ignoring the problem. afg-redbut.jpg Now, what is this button and why does it trip? It is a safety device. It shuts the burner down when it thinks there is a problem. It is on the primary control and is hooked-up to a cad cell. A light sensor. (The same thing that turns outside lights on at dusk.)
On a call for heat, with the burner running, the cad cell senses the light of the flame. If it stops sensing the light of the flame, it causes the red button to trip, shutting down the burner before any significant damage is done. Next question. Why would the sensor stop sensing light while the burner is running? Many reasons. Almost all of which require a service call. Below is a list of possible causes and things to check. Items in blue usually require a service call. Items in red however can be addressed, even fixed by the homeowner.
  • Faulty or dirty cad cell
  • Faulty primary control
  • Bad or weak ignition transformer
  • Bad burner motor
  • Bad fuel pump
  • Blocked oil filter, strainer or nozzle
  • Delayed oil valve not opening (some units)
  • Cracked electrodes
  • Improperly set electrodes
  • Air in fuel line
  • Burner running with a very high smoke
  • Burner sooted-up
  • Loose electrical connections
  • Damaged flexible coupling
  • Water in oil tank

  • Out of oil - Have your tank filled
  • Chimney blocked - Have it cleaned
  • Closed oil valve - Open valve
  • Air, Pump not primed - Prime pump - may need to call for service
Oil filter refills oilfilter1a.jpg
Oil filter canister eksmart.gif
Smart Filters
The bottom causes in red are common problems and can be addressed by the homeowner. Try to check for these conditions first before calling for service. Hope this helps, remember - these are just rough guidelines and not all possible situations are covered.

I found this article on the Web So I can't take credit for it..... But it is a very good place to start for your problem It is what I would start checking if you called me for service .......Good Luck

May 02, 2011 | Heating & Cooling

1 Answer


The easiest check to see if pump is working is to disconnect the jet line (small oil line running from pump to the drawer assembly), from the drawer assembly, put into a small cup/container and turn the unit on. You should get a solid stream of oil coming out of the line.

If you do not get any oil, remove the pump from the burner chassis, and ensure that the coupling connecting the motor and pump is intact, and that it has not stripped out.

Hope this helps

Nov 17, 2010 | Heating & Cooling

1 Answer

dripping fuel from the bottom of the burner its a af15 beckett oil burner

No, you should call a person that can service oil burners. Either the nozzle is bad and oil is dripping into the burner tube and running down or the nozzle is loose and the oil is running out from the threads of the nozzle. Either way the nozzle should be changed and the burner retuned with a combustion analyser..


Mar 27, 2010 | Heating & Cooling

2 Answers

im getting diesel from tank to burner but not going through to the nozzel its not coming through the small short metal line into the burner iyself

Disconnect the fuel ines and make sure they are not clogged up if they are clean them. www.howtocleanstuff.net

Oct 13, 2009 | SySTOR Systems (400S52) Burner

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