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943 Hydrostat problem?

M

micah wald

Member
Joined
Aug 6, 2020
Messages
13
Location
Missouri
Just bought a 943 and the machine will only move slowly forward in F and R no matter the throttle position. Linkages seem correct. Just ordered new track pedals(frozen up). The only thing I see missing is a linkage from the throttle to hystat. Haven’t changed filter yet but machine Was operating normally 4-6 weeks ago.

Any tips or is the hystat trashed?
 
S

sealark37

Well-Known Member
Joined
Jun 3, 2012
Messages
120
Location
Davidson, NC
Occupation
Retired pilot, old equipment mechanic
The frozen steering pedals are caused by the corrosion of the needle bearings in the pedal mounts. Aftermarket bearings work well, but you may have to resort to the vise and large hammer to disassemble the shafts and mounts.
 
M

micah wald

Member
Joined
Aug 6, 2020
Messages
13
Location
Missouri
Thank you gentlemen. I was a little worried. CAT informed me today that the pedals I ordered were just that “the pedals”. So into a bucket of tranny fluid the assemblies went and I ordered bearings hopefully they come apart.

Will update when I get a little farther on repair.
 
Cmark

Cmark

Senior Member
Joined
Jan 2, 2009
Messages
3,178
Location
Australia
Can you verify that the centre pedal linkage is correct? There are alignment holes in the brake lever and valve body.
 
M

micah wald

Member
Joined
Aug 6, 2020
Messages
13
Location
Missouri
I found a broken spring when we tilted the cab and removed linkages for steering pedals from trans. This spring was on the right side of the machine somewhat behind the linkages for steering. Probably 2 inches long and 1 inch in diameter.

The center pedal seems to move freely but will not stop the machine when creeping forward. I will triple check everything. I’m sorry I’m not a HE mechanic by any means just a guy trying to solve this.
 
Cmark

Cmark

Senior Member
Joined
Jan 2, 2009
Messages
3,178
Location
Australia
This is the brake lever (circled) seen from the right side of the machine. The spring (red arrow) is possibly the spring you found. The hole in the lever (blue arrow) should align with a hole in the valve body when the brake pedal is in the off position.

lever.jpg
 
M

micah wald

Member
Joined
Aug 6, 2020
Messages
13
Location
Missouri
The hole looks to be aligned. That was most definitely the spring I found. Thank you! Atleast now when I go to order one I can tell them where it goes.
 
S

sealark37

Well-Known Member
Joined
Jun 3, 2012
Messages
120
Location
Davidson, NC
Occupation
Retired pilot, old equipment mechanic
No worries. Sometimes, even the old hands are stumped by a hydrostatic transmission.
 
M

micah wald

Member
Joined
Aug 6, 2020
Messages
13
Location
Missouri
Yes I’m learning these transmissions are really a marvel how they work.

Unfortunately the old hands around my area that are familiar with these machines are getting few and far between.
 
M

micah wald

Member
Joined
Aug 6, 2020
Messages
13
Location
Missouri
I forgot to update.

We were able to get ahold of an expert. He put gauges on the charge ports and after adjusting something inside the hydrostat cover on each side the machine operates normally. The machine made an awful noise (hydraulic) of some sort. As he listened and adjusted the noise went away and the machine functions normally.

Machine was on its first job in years and blew a hydraulic hose between the hystat and right side drive motor. It’s was fun to get out. But was working great!
 
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