Broken seat rails (Kubota B2710) pics and REPAIR

   / Broken seat rails (Kubota B2710) pics and REPAIR #1  

Sodo

Elite Member
Joined
Apr 21, 2012
Messages
3,197
Location
Cascade Mtns of WA state
Tractor
Kubota B-series & Mini Excavator
My seat rail broke. I welded it up but I can see the problem (why it broke).

Other Kubota owners should probably unbolt your seat and LOOK for cracks. If it's just cracked and all the parts are still together, you don't need to weld. Just countersink the hinge base and re-tighten. With the countersink, the bolt tightness will hold the cracks together (as it was intended) and it won't crack any further.

To inspect, you can do it two ways.

1) Tip your seat forward and yank on it. If you see "movement" between the seat hinge and the sliding seat rail, the rail is cracked.
--- OR ---
2) remove the four bolts and LOOK.

561193d1530725822-broken-seat-rails-kubota-b2710-1_seat_remove-jpg


561194d1530725822-broken-seat-rails-kubota-b2710-2_note_cracks_rails-jpg


561195d1530725822-broken-seat-rails-kubota-b2710-3_identify_problem-jpg


561196d1530725822-broken-seat-rails-kubota-b2710-4_countersink-jpg


You can use a large drill bit as a countersink.

Another way is to put a large washer on each bolt with a hole thats a slightly little bigger than the four square bumps. But not too big cuz you want the (round) bolt-head below to bear out on the washer flats, not on the washer hole.
 

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