3000 Series Steering Lag

[jb1961]

I'm stumped.

My '99 3186 was always well maintained, remains in exceptional condition and until recently, rarely a problem. Late last season the power steering developed symptoms of failure all the while, all other hydraulic functions working perfectly.

First, the symptoms.

i. at start up the steering wheel turns freely with some uneven resistance and has NO effect on the steering power cylinder.
ii. after moving forward or reverse or raising the deck up and down, the steering may return with full power assist. Albeit, not consistent but enough to operate the tractor safely.
iii. once hot, hydraulic pressure returns to the steering cylinder and steering will work - almost properly excepting;
iv. when cutting, the steering track is not stay steady. It wanders most often to the left and a firm jerk to the right is the only way to get it back on line. Even then, constant back and forth on the wheel is necessary to keep the wheels straight.

I took the following actions in keeping with the above symptoms:

CHANGED HYDRAULIC FLUID AND FILTER PER OEM SPECS

i. Replaced the tilt wheel bushing and its connector to the steering valve assembly. This did provide some needed rigidity to the steering column. Note: this bushing wears down from constant use of the tilt wheel in its lowest position. Recommend upright use more often than not.

ii. Replaced a worn steering arm, its axle and stem. There was some visible wear and tear between the arm and stem. Replaced all hardware and all ball joints. After alignment, these repairs did improve slack in system but not the wandering.

iii. I then replaced the following:

a. hydraulic steering valve assembly (from a donor)
b. installed a rebuilt steering cylinder
c. replaced mounting hardware to limit play
c. cleaned inspected the supply line and replaced all o-ring

There is no visual damage, kinks or leaks to the hydraulic pump and the steering supply line. Again, there is no malfunction of the transmission drive or lift cylinder. All functions go, except for unpredictable power steering!

After all this, I still have only intermittent power steering and even when working, the tractor will fade to the left as if the cylinder is pushing it out of line and not an alignment issue.

Any clues?

JB Moore
Reynolds County, MO











ii.