Jensen a540, pulse and feed problems

[pyro]

Hey all, not been about for a while but Ive been busy!

 

At work we have a jensen a540 chipper, id guess at about a 2010 model, and its been no end of bother, Its got 164 hours on it, and in the past 12 months it has had:

new circuit board

feed roller bearings

3 exhaust flexis (they fit one each time it goes in for repair!)

and one or two other bearings.

 

It only gets light work, no where near what it is capable of.

 

so the latest problem:

 

Started it yesterday morning, first time in a while, and it ran perfectly for a couple of hours, pulse feed when necessary. Perfect.

 

after we stopped for a brew in the morning, we started it up again, and no feed. at all. no matter where the stop/reverse bar was.

the only way to get it to feed was to turn all the way in the little brass nob on top of the valve block.

 

Now whilst this gets it feeding again, there is no stress control.

 

with the little nob turned all the way out again, nothing at all.

 

speed control seems to work at it should.

 

at a bit of a loss with this one, and its getting a bit annoying really!

Its been in to beaverplant (Stamford bridge) a few times and as usual it behaves perfectly.

 

Its been an on going problem for a few years this, we think we get it sorted then it gives up again!

 

any help would be appreciated!

 

thanks

Ben

 

pictures for interest:

Edited February 27, 2015 by pyro

[Stubby]

Just behind ( or forward of , depending were you are stood ) the feed roller speed control is a solenoid block with a black wire coming out of it . If you " waggle " this wire do the feed rollers stop and start ? If so this needs replacing , the whole solenoid that is .....

[pyro]

Thanks stubby, I shall investigate Monday morning! I was looking at the solenoid and wondering!

 

thanks

Ben

[Johny Walker]

Thanks stubby, I shall investigate Monday morning! I was looking at the solenoid and wondering!

 

thanks

Ben

 

my tracky did a simler thing turned out to be the switch under the feed hopper rusted up ,could be the engine hooper switch on yrs same typ of switch ,worth a look

[swinny]

Is the little green light on the computer? if it isn't it isnt picking a speed reading up from the sensor on the flywheel.

 

Also check and clean contacts on the solenoid where the little brass screw is

[jeanesy]

Hugh yyy