I guess the control vavle itself is leaking if it went from a slow to faster leak. Pump to vavle hose normally blow and pump the hydraulic system empty before you know it is leaking. I have seen a few with pin holes that leaked, but that wouldn't be my first guess. From there it could be a loose...
The highest a skids there can lift is 12', that's a T870., add the auger drive and at best you may have 10' with bit and extensionsee. An E50 excavator with an auger head could probably do it but it would be very unwieldy. Also normal auger heads are designed to go straight down. Running at an...
I'd say it's a good price if in good shape. Look the arms over closely as they can crack. Not a bad idea to bring a jack to check wheel bearing play. If it's low on hydraulic fluid, flip the cab and look for signs of leaks. If it hasn't been done yet, if you buy it have the timing belt changed...
Lube the pins for starters. The power bobtach has only 300 psi metered to it so it's weak. Deadheading the main system causes a spike of pressure to the bobtach.
I know I'm 100% correct. 2 speed wasn't offered until the T650 and T700 series came out. Bobcat was actually very stubborn about adding 2 speed to track unit because they saw no real benefit to it. Bobcats tend to be a little faster then a comparable 2 speed in low. A 2 speed has no real power...
The pump can fail and either pump fuel into the crankcase or draw engine oil into the fuel. The transfer pump is not high pressure, maybe 10 psi. Dutez will actually run without it working at all. Won't have any power, but will run. Black smoke is excessive fuel. Blue smoke is oil. White is lean...
It try it with the drive belt off. If the steering is way out of adjustment that it's running against the brake or the aux is stuck on, it will create too much load for the engine to crank over fast enough. As for your wiring, it it right, but a new harness.