jd350 dozer hyd problems

[walter shea]

I have a jd 350c dozer the 6way blade has stoped working blade acted funny then stop working all together wondering if it could be the pump or if the main relief vale or valve body is messed up when you start the dozer the oil in the tank goes down about a 1/4" but nothing happens?

 

[Roy Suomi]

I'm wondering if the splines wore out on the pump drive to the hydraulic pump..Happens very often..Usually goes at the pump splines where the splined coupler drives the pump..The pump splines somehow wear out at the same rate as the coupler..This makes the pump splines unuseable..I buy a new pump coupler and push it farther onto the pump and weld the coupler to the splines on the driveshaft..It gets a couple of more years out of it before it's actually junk..

 

[Anonymous-0]

the pump seems to be turning i know the shaft is still spinning to the pump where it goes in to the pump?

 

[Roy Suomi]

It seems to be turning ??? Or it is turning ???With the nose still on the machine , it's tough to actually see if the pump shaft is turning or not...Like I said the pump spline to drive coupling usually goes first..

 

[walter shea]

Like you said!!! upon further investagtion the pump shaft spline s are worn and the drive shaft was spining but not the pump . the pump turns freely by hand and has suction i'll try what you said about getting a new coupling and welding it on thanks