Part for a shear grab

millertime78

Hi All

I have a small McKenna shear grab. It's mounted by attaching a long bar between the lift arms of the tractor. The bar is then secured by two circular stoppers. I can't for the life of me find these stoppers. I rang McKenna's and they're having a look for them but I said I'd try here also

You'll see the stoppers on the picture of the grab attached ( found pic on done deal)

Muckit

Hi Millertime78

We had the EXACT same grab some 5-6years ago. Great little grab, sorry now I traded it for a Mchale on mast.

The circular stoppers you're on about are they not welded to the bar each side, they act as a guide to locate bar into the hooks on the grab??

Ours were and then you had two yokes in between the stoppers which helped keep bar in place in the hooks.

Am I missing something?:rolleyes:

millertime78

They're not welded on, you put the bar on the two arms of the tractor and then secure it with the circular stoppers.

its a super little grab alright, very easy to work and extremely manouverable esp when dumping into a circular feeder

leg wax

Muckit wrote: »

Hi Millertime78

We had the EXACT same grab some 5-6years ago. Great little grab, sorry now I traded it for a Mchale on mast.

The circular stoppers you're on about are they not welded to the bar each side, they act as a guide to locate bar into the hooks on the grab??

Ours were and then you had two yokes in between the stoppers which helped keep bar in place in the hooks.

Am I missing something?:rolleyes:

looks like that to me as well

Muckit

So your missing the lads that keep the bar in place?

How did they come off? wouldn't the guides each side stop them from coming off?

mossfort

why not buy two large washers for the job?

millertime78

Muckit wrote: »

So your missing the lads that keep the bar in place?

How did they come off? wouldn't the guides each side stop them from coming off?

No, the fellas for keeping the bar in place are there, its the circular stoppers at the ends which are missing, two large heavy duty washers like mossfort suggested might do the job, they'd want to be thick though as these stoppers prevent the bar from moving and keep the frame of the grab tight to the bar

Muckit

Ya your right there's alot of pressure on these 'circular stoppers', maybe that's how they came loose in the first place? And as you siad, the grab has to fit in tight against them. Therefore whatever you replace them with will need to be chamfered on the inside (as the original parts were), or you won't have a hope of lining it up right and the grab sitting down in between them. I'm thinking if you don't chamfer the inner edges, it'l take ages to get the grab allined and fitting on the bar and it won't effectively be a 'quick hitch' bar anymore

I'd say if you could get a local engineering firm with a lathe to knock you up some ends would be the best solution. They'd be able to bore the hole to let the bar through and also chamfer the inside edges of the 'stoppers'.

Best of luck with it, hope you get sorted out.

By the way, does your grab still have the original straight blades (as in photo you posted)? Ours were replaced with zig zag ones before we had it

millertime78

Muckit wrote: »

Ya your right there's alot of pressure on these 'circular stoppers', maybe that's how they came loose in the first place? And as you siad, the grab has to fit in tight against them. Therefore whatever you replace them with will need to be chamfered on the inside (as the original parts were), or you won't have a hope of lining it up right and the grab sitting down in between them. I'm thinking if you don't chamfer the inner edges, it'l take ages to get the grab allined and fitting on the bar and it won't effectively be a 'quick hitch' bar anymore

I'd say if you could get a local engineering firm with a lathe to knock you up some ends would be the best solution. They'd be able to bore the hole to let the bar through and also chamfer the inside edges of the 'stoppers'.

Best of luck with it, hope you get sorted out.

By the way, does your grab still have the original straight blades (as in photo you posted)? Ours were replaced with zig zag ones before we had it

Thanks for the advice but I got the stoppers from McKenna's in the post Friday, its a straight blade, working great now

Muckit

ah excellent stuff!;) Your sorted so!

I had to change the seals in the little ram that tilts the grab. The big single ram for closing the grab is a great idea I think, rather than 2 small ones. It used to close much quicker than the Mchale I have now;)