Thanks for posting John.
I currently have rollers and idlers at 50%,grousers at 75%good,bushes at 80%worn,rail at 82%good and sprockets at 100%worn.
Tractor is working in nice soft sandstone,but it's super abrasive.
Previous D9T,D8L and 155's struggle to get 1500 hours on complete set.Turning has never been a successful story apparently.
Machines were operated in 2nd cog.
These days,I've got 1200 hours on general duty Cat chains before sticking £480 ITR segments and taking them on another 450 hours before selling that particular D8R.
Cannon wear was still in spec and rollers were just starting to rub bushes,and I feel I would have achieved 1900 to 2000 hours.
However,the D8T has the positive pin retention heavy duty chains with around 1200 hours in sandstone and 400 hours on general muck.
The D8R and D8T are operated only in 1st gear and are treated very steady.
I have Cat out frequently monitoring the tracks,and have been advised a turn is due now.
I'm positive in my head,that the general duty Cat chains have given same bush wear as the positive pin chaines at a cost of £4000 less.
Cat want £5200 to turn my ppr chains plus I'll have the cost of any hardware they don't reuse and the cost of transporting the track groups about the country to the track shop.
The bill could easily be £6500 plus downtime.
For reference,A brand new set of general duty Cat chaines are 9k(although they'll do them at 8k),a set of ppr chaines are 14k,a set of general ITM chaines are £5800 complete set and a set of ITR ppr chains are £7800 for the complete set.
Million dollar question