I am not at all familiar with industrial hydrostatic drive systems, as used on bobcats and such. I need to find a tutorial, or tutor that can help me with, understanding the drive mechanism, on an early bobcat 975 s/n 4963c. and should everything be plumbed on the suction side, with heater hose? I think this would collapse. machine looks nice (paint job) and supposedly has a rebuilt engine. but can hardly move on its own power, main hydraulics seem ok, but haven't put a gauge on them yet.(well it lifted the machine, to put blocks under it). The customer told me the guy he bought it from thinks the clutch disc is in backwards. Is the clutch on this antique(1978) an over center clutch or automotive type? Is that lever on the right hand side, supposed to be up or down. the manual we have is for s/n 11001 and above. and nothing looks the same. As what the book shows. The book shows that lever as a pedal, with connections to the, Brakes? I see no brakes on it. To old and tired, to change:Banghead
the engine clutch in that unit was there for cold weather starting. if it's installed incorrectly, or out of adjustment it could cause the symptoms you mentioned. if i recall correctly, that unit probably has 2 speed, turning/twisting the RH steering lever changes speed ranges between low and high. i dont recall exactly how the suction side of the hydrostats were plumbed, but i'm sure it wasnt with heater hose. most early bobcats used low pressure hyd hose on the suction side. the hose should be ridgid enough that you cant collaspe it by hand. memory is a little foggy, i havent seen one for at least 10 years. :drinkup
Thank you! Crewchief888, your help is greatly appreciated, The clutch disc in this, must not have a spring compensator in it's center, and the pilot sleeve, protrudes either more on one end, than the other? and if flipped it will hold pressure plate off of the flywheel. The adjustment turnbuckle was loose and doesn't seem to care where arm is located up or down, it all feels the same. again is this lever supposed to be up, or down? To be in engaged position. as far as suction hoses go all fittings are barbed type, on everything on the suction side. I am somewhat worried that its one and only, cartridge type hydraulic filter is not sealing, as the end of the canister can is all concaved in from over tightening.:notworthy
the last time i saw a NEW 975 was '84 or so, the prototype 943's were out in late '84/early '85 i think. truthfully i cant remember what the clutch setup looks like, i had an engine out of one in '84. parts may still be available from bobcat, you can check at bobcat.com, they now have online parts listings, however, you'll have to contact a dealer to get pricing :drinkup
Big scrap iron.
That bad huh!?
i'm thinkn dan dont like 975's :lmao :drinkup
I don't care for anything older then a 50 series to work on.
unfortunately we still have a lot of 50 series, quite a few 40 series, and even a few 600/610's around here. biggest problem is by the time they get to our shop, they've been abused, i mean fixed, by some home handyman, and need 2x's as much work. and the owner just dont want to pay for the time it takes to do it right, istead of patching it back together with more duct tape and bailing wire. :drinkup
I see lot of 753 and there are a few 853 out there. Even if they are rough, I generally get the ok to bring them back to nice equipment. Most 40 series are so far gone the machine should just be put out of it's misery. Beside 40s are the biggest pain in the ass to work on. I would rather fix an electric problem on a a300 then a hydraulic hose on a 742.