743 hydraulic pump problem

[shomfeld]

I have a 743 that has me stumped. When I purchased the 743 it motor ran fine but it would not drive or lift but it would free wheel easly. I first thought it was the u joint between motor and the pump but it looks fine so I pulled off the front pump and cranked the motor and the front shaft turns fine and the pump gears looks good. So I started to move the foot pedals and the right lever side to side and I noticed the spool valve would not move in or out on all 3 spools and the safty lap bar locks were down. I cant move the spool in or out even with a prybar. the bobcat is not rusty and it is not frozen. I have bought fixed and sold dozens of 743's and this has me stumped.. thanks

 

[Tazza]

It could be that the balls in the cap on the control block has worn and the balls and spring have wedged it in place. Can you un-do the cap on the back of the control block and rotate the spool?
But for all of them to be stuck is odd. Is the oil the correct colour? i guess they could have frozen up with rust, but its doubtful as its running is oil.

 

[Fishfiles]

It could be that the balls in the cap on the control block has worn and the balls and spring have wedged it in place. Can you un-do the cap on the back of the control block and rotate the spool?
But for all of them to be stuck is odd. Is the oil the correct colour? i guess they could have frozen up with rust, but its doubtful as its running is oil.

wow , a wild guess ===I think you may have two seperate problem and maybe they are connected , for it to free wheel you may have broke the shaft inside the pump or totaled out the rotating group and trash may have went thru the system and a chunk is stuck in the spool