twingard, I don't know if this pertains to your situation or not, but when I picked up an 1872, it was as you said "sticky and jerky" too. The previous owner really tightened down hard on the nut that controlled the friction on the hydro lever. This caused a lot of extra effort and would not move smoothly to make hydro adjustments. I would try as was previously suggested to change the filter and oil since you may not know when it was last done, but keep this in the back of your mind in case the previous owner was fiddling with this too.
BTW - Congratulations on the new additions!
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1989 - Cub Cadet 1772
1987 - Cub Cadet 1572 w/Rear PTO & Cat. 0
38" Lawn Sweeper #196483
42" L42 (Bush Hog) Rotary Cutter # 190349
45" 2-Stage Snowblower # 196364
48" Haban Rotortiller Rear PTO Driven #190356
54" SnowBlade with hydraulic Angle #196376
60" Haban Mowing Deck #196374
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