Tractor Repair

[Lewis Medlock]

Tractor 3 point linkage bracket thingy had some cracks. Upon further inspection both brackets were cracked, one worse than the other.

 

[Lewis Medlock]

Brackets removed and cracks ground out. the worst one went all the way through, there was more cracking around a bolt hole.

 

[Lewis Medlock]

I bolted the brackets back to back to control distortion and started welding. 3.2 Esab OK46's (rather than one run with a 5mm iron powder electrode )

I left them to cool overnight before unbolting and starting the other side.

 

[stormin]

To reduce chances of it happening again I would extend the central flitch / stiffener toward the front of the plate. That way both sets of bolts will be doing the work. Current design is crap, only the rear bolts are doing any work hence the crack in the plate.

 

[Lewis Medlock]

First pic is the 'root' of the previous day's welding.

 

[Lewis Medlock]

I think you're right stormin, to be fair I don't think it'll be long before my repair starts cracking on the HAZ but it keeps the tractor workin.

 

[Lewis Medlock]

other bits

 

[Lewis Medlock]

Half painted and fitted.


All the best, Jim

 

[Welderpaul]

Looks a poor design, repairs look good.

 

[snowcat]

6080? IMHO the cause has been lose studs at some point especially as they have witnessed on the threads, 15 years as our local NH dealers welder and I would say Iv seen only one bracket fail, pretty proven as they've been the same since the FIAT winner days...

 

[scarecrow]

its very strange that they should break even if the nuts were loose any idea why it happen

 

[Lewis Medlock]

Hi Snowcat, the bolts were torqued to 'FT' when the brackets came off for repair. Only the impact gun would shift them according to the bloke that took them off.

He put it down to poor adjustment of the turnbuckles when ploughing (i.e it's the other person's fault!). You're right though, the bolt holes have had a hammering, it's interesting that it's not a common problem.

Jim.

 

[scarecrow]

He put it down to poor adjustment of the turnbuckles when ploughing (i.e it's the other person's fault!). You're right though, the bolt holes have had a hammering, it's interesting it's not common.

Jim.

looks like someone may have tighten the stays to much

 

[oilcooled :)]

just done that same repair a month ago on a 110-90 fiat, studs were very thight to get off

 

[Lewis Medlock]

looks like someone may have tighten the stays to much

Hi scarecrow, maybe too tight or maybe too loose causing the plough to slam from side to side when going round the headland.

Either way it keeps me in work

Jim.

 

[octo0072000]

axle casing

my local plant fitter has just changed a back axle on a jcb fast track they managed to shear a wheel off near side smashing the axle casing god knows how they did it and no one's owning up to it as usual

 

[stormin]

6080? IMHO the cause has been lose studs at some point especially as they have witnessed on the threads, 15 years as our local NH dealers welder and I would say Iv seen only one bracket fail, pretty proven as they've been the same since the FIAT winner days...

Loose fixing bolts crossed my mind too given the marks on the insides of the holes.
Tractor horsepower and linkage loads have gone up condsiderably in recent years, so maybe time for a re-design of that bracket.