1968 i600 gas bhl stalling when clutch released

Hi everyone - I am new to large equipment and have had this back hoe for couple of years..hasnt every run 100 percent but I'm trying to put some time into determining why.

currently I can start the trator with the clutch engaged. release the clutch regardless of how slow..cause the rpm to drop and the tractor will stall. this even occurs with shuttle in neutral.   I can hear / feel what I believe must be the rear hydraulic for the back hoe trying to spin (whirling noise below/behind me). could this be from improper hydraulic fluid level? I can no longer keep it running effectively enough to move it. thanks in advance

Does it do this at idle or wide open? How does it sound with clutch pushed down?MACK

If something isn't in a direct stall (pump or tranny), Do you have a diverter valve, thats stick halfway in the middle?  Diverter valve was used on some older hoe tractors, one way, the flow goes to the loader, other way the flow goes to the hoe.  In the middle, the flow stalls.  Generally put in an easy position to knock with your knee, as you get on/off, IIRR...

Glad you narrowed it down to fuel restriction... I guess we should have suggested the simple things first . A 1/4" line is plenty big for gas flow. I have had it happen to one of my tractors that the sediment valve unit became restricted enough that it had to come apart and be thoroughly cleaned (the tank has to be drained for this). After that all was good. I agree with the lack of drop being critical from the bottom of the tank to the carb but with good flow you won't have a problem. I am able to climb very steep hills with my D14 (similar set up as your I600) with no problem of fuel supply. If you test the flow rate you will need a minimum of one to 1 1/2 fl. oz. for every 30 seconds but a bit more could be needed under very hard working conditions.

Sounds like you need to unscrew the sediment bulb from the bottom of the fuel tank and see if it is part way plugged. For years my series 4 D17 diesel did not seem like it had a lot of power when I hit a hard spot plowing or pulling the big baler in the hills. I took the sediment bulb out one found a piece of gasket from the fuel gauge. It had been in there for years. I have owned the tractor for over 30+ years and never had the fuel gauge out of it. It now has a lot more low end torque. Good luck with your tractor.

HD6GTom you were spot on.  drained the tank , pulled old sediment bowl and inlet was nearly fully clogged.  Seemed to be some type of material - it was flexible enough to get in there but it was tough (couldn't break it up).  Probably some piece of gasket too.  Tractor is running great and we finally started using it again.

hydraulics all work. no change in engine sound. prior to all this ...I would definitely hear a difference when I had everything in neutral and released the clutch...like a load was put on the motor (pump I presumed). when the motor wasn't running properly it was enough of a load to cause it to stall. it did have some noise to it ..like a whining (feels/sounds like it's under the seat) I had checked the fluids and changed everything out last fall..drained the rear-end gear oil. hydraulic has a small leak on one of the stabilizers so I have to add it regularly. where he said he saw the fluid was what I believe to be a breather for the rearend just behind the dip stick (grey fluid). the hydraulic I've been filling near the front frame...and I believe the plug in the frame near where you get on the tractor is how to check the level...but every time I've opened that my hydraulic fluid wants to foam out there ..like its over full...or possibly getting water into it ..im surprised that it seems to have so much air in it. wondering if it (the fluid) broke down and I lost a bearing..or possibly clutch plates contaminated..not sure if this is a wet clutch type of setup?

Edited by bobazume - 14 Nov 2017 at 9:56pm