Vermeer BC-935 Autofeed not working

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Mauizook

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Aloha all,
I have am autofeed issue. I've checked fuses, wires for continuity, grounds, and AC voltage from magnetic pickup switch (which reads about 18 at idle and increases with engine speed). This thing boggles my mind. Any help or suggestions are greatly appreciated.
 
Did you ever find the problem? I am having similar issues...... I have also tested everything and its all in normal working condition but i have no foreward on the drum?? Reverse only and the status light for foreward enable is not lit also the foreward on light is not lit.. No ideas left.....
 
There could be many issues going on here. The cartridge/spool could be bad. They become weathered and rusted and need to be cleaned with emory paper and oiled lightly. Is the tach reading the reading the RPM's properly? Tachs run either off of the alternator or speed sensor that's located in the bell housing of the clutch. If the tach isn't reading the RPM's this could be an issue as well. This is a hard issue to correct when I don't have the machine in front of me.

I hope this helps!

Dave
Global Equipment Exporters
770-420-6400
 
Do you know the correct voltages for the magnetic pickup?
I have 11 volts at idle and 38 volts at full throttle.
I have tested all the emergency stop switches and they are good. I also have a green light on the acs for emergency stop. So I don't think that's a problem.
I have also tested the switches for the top bar controls. The stop and reverse and foreword switches are working and check out with a meter.
I have 14.2 volts going to reverse but no voltage at all for foreword.
If I switch the leads on the spool valves the feeder drum will operate in foreword when in put in reverse. I don't think it is a mechanical problem because it will operate when voltage is applied.
The problem seems to be I am not getting voltage to the foreward controls.
Not sure why??
 
The alternator seems to be steady at 14.2 volts.
The voltage at the tach pickup is 11 volts at idle and 38 volts full throttle.
I don't have a manual to know if the pickup voltage is correct or not.
 
The battery only puts out 13.6 volts. I would still disconnect the alternator as that is where the 38 volts has to be coming from. Unplug the alternator and then check the voltage and let me know.
 
The magnetic pickup generates it own signal voltage from the flywheel.

It has nothing to to do with the alternator or the battery.

The sensor generates its own AC voltage. Its not DC voltage at all.

The voltage at the magnetic pickup is 11 volts AC at idle and 38 volts AC at full throttle.

I gave up trying to fix it. The Vermmer Dealer will be out on Monday to fix it.. It will be a $350.00 road service fee for them to show up!! Plus parts and Labor, So its not going to be cheap......

The dealer is a four hour round trip drive to drop off the chipper and I would have to make two trips.
So not spending 8hrs on the road, Is worth the road service call fee.
 
Your pickup is working, does it read proper RPM on the tach? Does it have an autofeed tach or control box? What are your autofeed settings?
 

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