Bobcat 773 turbo binding on r/s

[tfg111]

I have a 2001 bobcat 773 turbo skid steer that seems to bind on the r/s when going forward, I have rebuilt the entire r/s drive system with new bearings seals and chains but it is still doing the same thing. It seems to jump and jerk on the r/s when you start moving forward. anybody have this issue? any thoughts would be appreciated. Thanks

 

[fortworth-cowboy]

I have a 2001 bobcat 773 turbo skid steer that seems to bind on the r/s when going forward, I have rebuilt the entire r/s drive system with new bearings seals and chains but it is still doing the same thing. It seems to jump and jerk on the r/s when you start moving forward. anybody have this issue? any thoughts would be appreciated. Thanks

Do you have slack in the chains on the RH side? Or do you have manual drive and the neutral plate hardware is worn out.

 

[tfg111]

Replaced everything but the gears and the gears look good

 

[fortworth-cowboy]

Replaced everything but the gears and the gears look good

In the chain ok, is it possible that the chains are uneven installed?
What about on top of the hydrostatic pump, is the hardware there worn or so?

 

[reaperman]

How many hours on the machine?

 

[tfg111]

Low hours 1500 I've tried adjusting the linkage on top of the pump and didn't notice any wear but I'll have to pull it apart and inspect it. Like I said Chains are new.

 

[fortworth-cowboy]

Low hours 1500 I've tried adjusting the linkage on top of the pump and didn't notice any wear but I'll have to pull it apart and inspect it. Like I said Chains are new.

How did you try to adjust the linkage? There is only one way, if you do it wrong the machine will either creep or maybe even not drive at all. I do not think that you stroked the swash plate completely otherwise you would have issues starting the machine

 

[tfg111]

Played with it in ever position possible it does not creep and is in a completely neutral position. It feels like it gets intermittent pressure on the r/s almost like it's jumping in and out of gear. Is there a proportioning valve or anything similar in the system? Just guessing at this point.

 

[fortworth-cowboy]

Played with it in ever position possible it does not creep and is in a completely neutral position. It feels like it gets intermittent pressure on the r/s almost like it's jumping in and out of gear. Is there a proportioning valve or anything similar in the system? Just guessing at this point.

r/s what do you mean with that?
The drive is pretty simple, the hydrostatic pump sends hydraulic oil pressure to the drive motor, depending on your swash plate position. The drive motors are connected to the sprockets, which are connected via chains to the axle sprockets. If you replaced everything, like you said, in the chain case, it is possible that one chain has to much slack. That will cause the chain to bind up when it goes over the axle sprockets, which would explain your jumping and the pressure rise, because it is working against that.
Could you take a picture of the open chain case, preferrable the middle and front cover?
Did you check the bushings from the neutral plate and the blocks? If there are worn, you can not stroke the swash plate correctly.