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thanks slider.. i've got one track split. i'm going to keep running the track chains as is at moment, just rebuild rollers and idlers. if any one has templates , measurements etc i'd love to have copies..

personally i'd be suspicious about any slop

yup more thanks guys, the email worked and i'm in touch with Zimmermans.. i've also replaced front crankseal  , getting new couplings for hydraulic pump. overhauling hydraulic valve, then i can start on track gear.
hope to modify a porta power  hydraulic set at work to press pins,

i see this message board is much the same as many others on the net,, full of lurkers you'd tyhink that more than 3 percent of viewers would have a comment, of at least some advice eh?

i don't know where it was made, i actually thought it was a fairly kosher item, but maybe it was designed locally for New Zealand agents,   but its well made with full six way adjustment. the hydraulic reservoir is located in behind where the lights should be and the low pressure pump is coupled onto the front of the balancer/pulley via a double  duplex chain and sprocket type of flex coupling. the blade control valve needs some attention but otherwise it all works fairly well.

thanks guys for the help.
theres plenty of HG/OC3's here but not so many OC4's  and especially ready to work.
it's a later model though 1960  i guess from the numbers,
OC4-3D-60    engine#DD130 H  #3601524

G'day. as you can see I'm a proud owner of one of these beasts,, it's in pretty good order and was running, although track gear needs work and as i discovered the front crankseal needs replacing, I'm hunting up a suitable seal at the moment,
i was going to try Zimmerman's but they don't have email, Pretty slack in this day and age.. i buggered if I'm going to make a toll call international..OK OK. bitch session over
now i need to find some measurements for track roller pins as some of mine are worn and need rebuilding, but importing would be too expensive.
i also have a suspicion that Atlas Copco airtrac drill track gear might fit but need confirmation on that. ??
any info would be appreciated,
i