J&S 540 Smoking

[Bob AstillParticipant @bobastill76884]

Hi all my 540 has started giving off a bit smoke and it appears to be coming from the base where the oil tray is with the motor and pump is it does not smell eletrical i have checked the motor and it all spins free i repacked the rear bearing with grease etc but i cant find where it is coming from? anyone had this before please.

Bob

[Bob AstillParticipant @bobastill76884]

Smoke

[David George 1Participant @davidgeorge1]

Hi Bob have you checked the chain and sprockets on the pump and motor for a little play but not too much. Also have you checked the spindle motor and belt for tension to make sure it isn't slipping er rubbing on edge of belt on its track. Give if a run with bottom cover and chain cover off but keep fingers clear.

David

[Martin CargillParticipant @martincargill50290]

Our surface grinder at work has a leaky arbour bearing seal that sprays a little oil into the grinding dust. From time to time this mix is set on fire by the sparks from the grinding wheel. not serious as it just smoulders a bit, but it does mean stopping a grinding operation to clear the glowing embers. It produces an oily smoke.

Martin

[Bob AstillParticipant @bobastill76884]

Thank you for the replys it has gotten a little worse now and it is definatley the pump motor as it does it without the stone switched on and turning?

Bob

[not done it yetParticipant @notdoneityet]

As they say “where there’s smoke, there’s fire. Def needs investigating seriously and rectifying immediately – and your insurance cover might need checking, too.

[Dave HalfordParticipant @davehalford22513]

Posted by Bob Astill on 18/09/2021 07:41:59:

Thank you for the replys it has gotten a little worse now and it is definatley the pump motor as it does it without the stone switched on and turning?

Bob

Why the question mark Bob? Just channel the Monty Python parrot sketch as you look at it and hope it's sleeping (it isn't, it's a few minutes from letting the flames out of it to join the smoke).

[David George 1Participant @davidgeorge1]

Check the contactor contacts that supply the motor as it may be a phase out or it may be the motor has a winding faulty. With a meter the three circuits should be equal resistance. It is possible to get these motors rewound if faulty.

David

[Mark RandParticipant @markrand96270]

It can be almost impossible to detect a shorted turn with a resistance meter. If you have a meter that measures current, then measuring the current to the motor on each of the three phases is more likely to detect a winding fault. Ok, it'll need three goes at disconnection-meter connection-reconnection, but it will show if there is a poorly phase on the motor.

Before you start this, is the grinder being fed from a good balanced three phase supply or a static or rotary converter? If the latter two, are the phase voltages reasonably balanced or is the generated leg much higher than it should be?

[Bob AstillParticipant @bobastill76884]

Thank you David and Mark i have a friend coming round who is a sparks so i will show him what you have both said thank you it is a permanent 3 phase supply that i have.

Bob

[Bob AstillParticipant @bobastill76884]

Update the sparky came we spent some time getting to the motor for a clear view the smoke is definatly coming from it phase one is 1.4A phase two is 1.4A phase three is 2.7A so i am going to take the motor out and send it to be checked thanks for all the replies.

Bob

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