Hi, apologies for slow the reply, but better late than never!
Firstly, you lucky devil! A free MF is ALWAYS a good thing ... it has to be really rough to be only good for spare parts!
It will certainly be worthwhile repairing and then you've got a usable and versatile machine.
Just be careful with a 3PT-mounted backhoe - these tractors were not intended to cope with the forces from them. Specifically, the MF top link attachment point will not handle a significant force in any direction other than fore-aft. Use the triple-mount with the flexible pin on the rear casing. Be sure to understand this - out 135's was broken by an idiot operator Dad briefly employed. It was repaired - evidently rather well - about 45 years ago! It's been fine since.
As stated, that looks for all the world like our 135, but with later 200-series sheet-metal. That is not such a bad thing - especially with the good power steering set-up. The std-spec rear axle with drum brakes, 3PT links, 3-152 Perkins and gearbox are all identical to ours. It appears only the US-spec 135s got the larger (65-type) rear axle and PAVT wheels as standard equipment. We have the usual-for-Australia 2-piece wheels with pressed steel centres and 14.9-24 tyres. Front axle is the trusty 3-piece (35-type) with 6.00-16 tyres.


Here are a couple pics - I don't have any better ones handy. Also, some shots of the drive for it's front-mounted pump as was being discussed as well. I'll try to take some better pics, but there is a really good protection grille to remove before I can photograph the pump. I think it's the same as Shaeff's tractor's set-up - mine is a MF40 - same 3-cyl Perkins and same gearbox as the 135, but it does have the bigger front axle (with 7.50-16s) and rear axle (with hub reduction and multi-plate brakes) because it also has a Model 102 loader. This tractor also has that woeful power-assisted steering as used on 235s. It does help, but it isn't as strong as it needs to be.
I hope we all realise these machines are nudging 50 years old, have done a lot of work and helped feed a lot of people. They need looking after now, and technology has also improved a lot since they were designed and built. Bigger and stronger MFs were available alongside these models. Keeping that in mind, I reckon they've lasted as least twice as long as was intended.