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Forst ST6 Feed Roller Problem


Gary Prentice
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Yesterday our ST6 had an hydraulic leak which, I think, caused the rollers to lose power. They'd turn (forward and reverse) slowly then stop.

 

The leak was in the top of the hydraulic tank, which forms the bottom of the rotor chamber, so we drained the tank, welded up the crack and then re-assembled everything. But, now we've only got forward/in operation of the feed rollers. The emergency mechanic stop doesn't work, the electrical stop button doesn't work and the rollers won't go into reverse!

 

Using the backwards/forwards control buttons, the lights on the electric modules attached to the manifold (?) hydraulic control thingy switch on and off, both turning off when you touch the stop button ( but the rollers still continues to run!)

 

Think that somethings airlocked, somehow, we've tried bleeding the system. Some of the pipes have a hole in the attachment nut, so when you loosen the nut and wiggle the pipe oil/air can escape. But no change.

 

We have tried running the machine for 15-20 minutes to see if it self bleeds - no change, but most of the time checking the tank the oil's got air bubbles in it.

Now officially totally stumped:sneaky2:, we're thinking that because the rollers are in-feeding instead of reversing, this isn't a stress control/ rev sensor/electrical issue but who knows.

 

Any thoughts or experiences, has anyone changed the hydraulic oil and had problems?

 

 

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Excuse my ignorance Mike, but which bit is the solenoid? The black relay-like box with the little light that lights up when you touch the switch to forward/reverse the roller?

 

The pipe from the tank to the pump exits at the bottom of the tank, as does the return, so I think the pump is ok. We drained probably ten litres, maybe more, from the tank to weld  it.

 

 

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