Here's a view of the drive tumbler showing how it engages the track pads. You can also see how the centre end of the track shoe pin bore is a reduced diameter to stop the pins walking inwards while the bolt on the outside stops them walking outwards.They will wear slots in the pads over time. The cogs wheels will have the wear marks of the lugs on the cog wheels as well. I've seen that system on big cranes also and never thought about the track chains probably wouldn't take the weight anyway.
This photo was taken at the docks. The whole shooting match came half-way round the world, was trans-shipped twice during that time, and arrived without so much as a scratch. Then this happened........Dock Hands were a bunch of Rubes if ask me, who signed off their longshoreman tickets as that is just beyond stupid as to damage incurred.
No John, a single Cummins QSK60 rated at 1950 BHP. I'll post some photos of the engine compartment tomorrow.Is that machine running two separate engines and sets of pumps? I did an appraisal on a big Hitachi years back that was configured that way.
It gets even better. Apart from regular maintenance the best thing to do is to have a complete "power pack" (engine, radiator, hydraulic oil coolers, pump drive, pumps, etc) all assembled in the module which is the grey & orange box you see here, then swap the whole thing out as one unit. With a bit of planning it can be done in just over a day. It's not that heavy, comes in a shade under 30 tonnes.Appears as they left notable room for working on this.