before you go too far once you get the machine back together and operational there is one simple check you can do and it might cost a total of $7.00 in o-rings X 2 kits.
i have sped read the topic discussions, with track issues the questions would be;
1 - does the machine track straight, or off to one side, and if so which side (referencing sprockets at the rear)
2 - when lifting the track off the ground is it slow in forward direction or reverse or both
3 - when tracks off the ground does the slow direction load down the engine?
4 - does the problem get worse as the hyd oil warms up?
i suspect that the 3 o-rings located in the one end plate of your hyd pumps regulator block have gone hard and hyd oil is leaking past the one o-ring which holds the hyd pump swash from that one hyd pump rotating group to not destroke as far as it should.
the check is quick and simple,
open the pump door, staring at you on the outside pump "p2" that regulator end plate has two adjustments (which should not be adjusted), the one that sits untop a stacked nut affair has a small square screw held by a 13mm nut.
scribe marking the orientation of the nut, sqaure, etc...
loosen this nut allowing the square adj screw to turn with it.
view inside the open hole and it should be dry, if oil drips out the o-rings require replacing.
if unsure you can start and operate the machine to allow hyd oil to warm up, no oil should exit past.
the hyd pump regulator on the pump closest to the engine is a mirrored version and the end plate faces the muffler.
this one sees more heat and is likely the one leaking
ph: 905-888-9070
ask for Adam.
you do both regulators.
at this point call me i'll explain as easier over the phone.
