Yep this happened

[Left hooker]

Bucket ram on my zx180

 

[Komatsu]

heard again recently there rams were snapping, take it everyone is ok

 

[Left hooker]

heard again recently there rams were snapping, take it everyone is ok

this ram was re-rodded at 6 months old under warranty as due to leaking from scoring from damaged bush in cap done 7 1/2 years

 

[V8Druid]

stress point where the shoulder is machined .... not a great deal one can do to relieve it either .... Vee it and it weakens it further ... cut a shallow rad in the transition point is about the best that can be done , but again reduces the material diameter ....they take a LOT of hammer

 

[Left hooker]

stress point where the shoulder is machined .... not a great deal one can do to relieve it either .... Vee it and it weakens it further ... cut a shallow rad in the transition point is about the best that can be done , but again reduces the material diameter ....they take a LOT of hammer

went right on last cut of the thread before shoulder can see the different times it has been letting go

 

[V8Druid]

went right on last cut of the thread before shoulder can see the different times it has been letting go

can believe that Stu ..... yet another stress point and the smallest diameter of the component

 

[Left hooker]

Hitachi sent through the tourqe setting for piston 4000nm can only get near half that with torque multiplier

 

[V8Druid]

Hitachi sent through the tourqe setting for piston 4000nm can only get near half that with torque multiplier

no wonder the bugger snapped off .... insane figure

 

[JD450A]

Hitachi sent through the tourqe setting for piston 4000nm can only get near half that with torque multiplier

I may have the gear to go up to that If you require.

 

[Shovelhands]

Hitachi sent through the tourqe setting for piston 4000nm can only get near half that with torque multiplier

They must have an extra Zero on that number, surely? I can’t see why it needs to be so tight?
Does the nut have a locking tab or pin?

 

[Quattromike]

I hope we're not getting mixed up between nm and lbs/ft.

 

[Left hooker]

I hope we're not getting mixed up between nm and lbs/ft.

nope lbs/ft is 2945 lol

 

[Left hooker]

Well took all day to build up and put back on digger hardest part was holding down the rod to stop it lifting when tourqing up resorted in having to put a load on lorry (12t as lorry got built in weigher) and backing it up over the rod as when lorry was empty it was lifting
broke the small tourqe multiplier 3/4 drive that was 5:1 and made around 2600nm before letting go so borrowed a bigger one from another plant hire firm up the road and got it to the required 4000nm it was rated at 4800nm and 1:68