Forst ST6P common issues?

[Mick Dempsey]

27 minutes ago, Ty Korrigan said:

Vertical.

We've decided not to feed it up to capacity when we get it back to see if it suffers significantly less stress and fewer problems.

I'm trading it in but the waiting list is 6 months.

  Stuart

What are you getting?

[treevolution]

38 minutes ago, Ty Korrigan said:

Vertical.

We've decided not to feed it up to capacity when we get it back to see if it suffers significantly less stress and fewer problems.

I'm trading it in but the waiting list is 6 months.

  Stuart

I have a Gm QC and have had the same problem with the feed rollers where they spring a leak and over time you lose all the hydraulic oil and rollers stop working. 

 

Apparently the problem lies with the roller motor that hangs down not being able to hold the weight of the roller on top. 

 

I have had 4 motors need to be changed over two QC. 

 

Funny but my first QC that I clocked 700 hours with never had the problem. 

[Ty Korrigan]

My own 2012 Quadchip rivaled Mick's Forst on the scale of witches curses.

I replaced at least 2 roller motors.

 

We are considering an Evo 165D

When I visited GM last July I took a long hard look at one with Jase Hutch explaining matters.

It is a far more robust build than our 150P

The Kubota diesel is tried and proven by and can be fettled by any agri-diesel mechanic.

I need a folding chute for storage, the insurance of a spare wheel and a folding hopper to chuck climbing bags in.

I'd like to go 8" again but for my current storage limits and these days I'm really just a small urban arb so a 6" suits.

  Stuart

 

 

 

 

Edited May 9, 2021 by Ty Korrigan

[Mick Dempsey]

I have paid of the Forst now, so I’m having the extra buttons fitted to the top of the hopper to conform to European regs, then it’s up for sale.

 

 

[treevolution]

I really like the new evo but I just don't think I could do with out a turn table as that's the best thing with the qc. 

 

Part of me is hoping that they will do an evo at some point on a turn table but until then I will just do with changing roller motors every now and then. 

[kram]

My friend has problems with his ST6P and this thread came up. Has anyone had problems with cracks on the flywheel fan blade welds? They want to replace the flywheel but its extremely expensive. Its a 2017.

 

The main issue, the feed roller snapped and is getting repaired.

 

I am wondering if this can be welded in situ, grind out the cracks and re weld. I'm not a professional welder but can do TIG and stick. I am unsure about something this size however - it should likely be preheated to avoid cracking, and very difficult to heat something that size, in place, without over heating anything else.

 

It will be a very heavy lump so no chance of us stripping it out ourselves.

 

Edited Friday at 20:41 by kram

[Mike Hill]

Well...

 

I have welded two different machines in that same area as well.I know of another that has suffered from the same poor weld quality.

 

Grind out and re-weld.You can preheat if you like but my 200amp kempi welded it up no worries.Dont worry too much about damaging the bearings if you do pre-heat,there is alot of steel between that area and the bearing seals.

 

You could weld stiffeners between the fans like Jensen has,they crack but not at the welds in the axis shaft like the forst do.The whole cutting disc flexes when its being fed bigger stuff.

 

The stiffeners are sections of a steel ring welded between the fans incase you are guessing

[Mick Dempsey]

I had a st8 from the same era, lost the vertical anvil completely, disappeared through the chute, welding so poor it was effectively glued on.

Moving it on was one of the best days of my life.

[kram]

49 minutes ago, Mike Hill said:

Well...

 

I have welded two different machines in that same area as well.I know of another that has suffered from the same poor weld quality.

 

Grind out and re-weld.You can preheat if you like but my 200amp kempi welded it up no worries.Dont worry too much about damaging the bearings if you do pre-heat,there is alot of steel between that area and the bearing seals.

 

You could weld stiffeners between the fans like Jensen has,they crack but not at the welds in the axis shaft like the forst do.The whole cutting disc flexes when its being fed bigger stuff.

 

The stiffeners are sections of a steel ring welded between the fans incase you are guessing

 

Great to know someone that has done a weld repair. I was also thinking reinforcement needed. You welded in situ? We dont want to strip it.

 

I assume your Kempi is a mig? I have a Sherman 200A tig/stick welder, I'm no good at mig!

Unsure to use basic 6013/er70 or the better 7018/er80, stronger but more likely to crack...

 

Might be better if we find a pro welder to do it. We are not trying to be cheap but £5k for a replacement fitted flywheel is too much...

 

Would you have a photo of the Jensen? If not I'll search for it when I get home.

 

I doubt the fan blades themselves see much force but looks as though they reinforce the flywheel.

 

When it works they are a great machine ( not that I have experience of others) and will swallow up anything that fits in the hole. Perhaps we should be more careful what we feed it?

[Mick Dempsey]

5 minutes ago, kram said:

 

 

 

When it works they are a great machine ( not that I have experience of others) and will swallow up anything that fits in the hole. Perhaps we should be more careful what we feed it?

You cannot use a chipper like that, if it goes in, it’s in.

Stress control should keep you from damaging it.