Echo 2500T battery saw- troubleshooting

[Kelsey00]

The other day my saw got bound up with some small suckers, no big deal right? Well now the saw will only run if the bar and chain are off. Correction, it will run, but only for a literal second before it stops and the power goes completely off. Its frustrating. Does  anyone else have any experience with this or have any advice on how I could go about troubleshooting this problem? Thanks 

[Dan Maynard]

Sounds like detecting a jam, is the nose sprocket completely free? Bar groove all scraped out?

 

I thought my Makita was jamming intermittently for a while, frustratingly inconsistent. Turned out to be trigger switch worn.

[kram]

Have you charged battery? It could be that its flat at the same time to confuse matters. I've done similar things before not realised. Tried another battery?

 

It sounds like the controller is saying "No!", could be many reasons for that, if theres no physical damage Id start with battery. It should spin without a bar or chain fitted.

 

Usually its very difficult to kill a brushless motor.

 sensors out of alignment, overloaded and burnt, or bad connection from vibration.

 

How does it feel if you turn the sprocket by hand? 

(I assume they are direct drive and clutchless, its a while since I used one).

Generally on any brushless motor there will be strong resistance between the magnet segments, it should feel strongly notchy, but not crunchy, the bearings should feel smooth and even all the way around.

 

 

[AHPP]

1 hour ago, Dan Maynard said:

I thought my Makita was jamming intermittently for a while, frustratingly inconsistent. Turned out to be trigger switch worn.

I was reading something the other day about fixing a Makita drill trigger. So there are at least two people in the world who’ve had that. 

[Mark_Skyland]

Remove the circlip and washer holding the clutch drum in place and check that nothing has gotten under there jamming things up. Depending on which type of bar you have check the nose sprocket runs freely and that the chain will move around the bar without any resistance.

 

[kram]

@Mark_Skyland if I can ask a pedantic question, is it a clutched saw? I assume the sprocket/drum part was for the inboard brake band, but has no clutch and is directly driven by the motor with a splined shaft?

 

Thanks

[Mark_Skyland]

It has no clutch, the drive is taken directly from the motor. You're correct that the drum is only used for the brake band as in most battery machines. The only saw that I have seen that has a clutch is the Husqvarna T542i