Tremor® Subsoiler - Unverferth Primary Tillage

The Tremor®subsoiler from Unverferth is designed to be tough and aggressive. Its parabolic auto-reset shanks, with 6,000 pounds of trip pressure and a working depth of 20 inches, are built to rip through the heaviest compaction and shatter hardpan. Shear-bolt protected shanks, with 7,500 pounds of shear pressure, are also available.


  • Welded, heavy-duty, double frame with 6"x 6" rear bar for increased strength and durability
  • Units factory assembled for 30" spacing, and an innovative frame design with bolt-on frame extension allows the customer to vary shank spacing from 20" to 40"
  • Gauge wheels with new 7.6Lx15-8 ply tires standard on rigid units, and 9.5Lx15-8 ply tires standard on folding models
  • Swivel coulter with 20" rippled blade cuts residue ahead of shank for optimum trash flow and features 1,500 lbs. of blade down pressure for optimum penetration
  • Model 730 features auto-reset shank design that allows shank to trip rearward and upward without use of shear bolts providing 6,000 lbs. of pressure per shank for consistent working depth
  • Model 710 features economical, shear-bolt, protected shanks with 7,500 lbs. of shear pressure
  • Up to 20" working depth for shattering the deepest compaction
  • 1 1/4" wide, high-stress, steel shanks with triangular-shaped forged wear bars for longer life
  • Replaceable 2 1/2" wide x 12" long forged points
  • Choice of tractor red or green high-quality powder-coat finish
  • 35" underframe clearance for handling residue


  • Rolling Finisher with spiraled, straight blades can be added to 4-8 shank models for additional finishing and thorough leveling of soil
  • Shank Stagger Kit can be added for reducing horsepower requirements and increasing residue flow. Kits available to position shank 12" or 16" rearward
  • Chromium-capped points and wing points are available
  • Covering boards are available for additional soil and trash mixing
  • Transport light kits for safer road travel
  • 3-Pt. Implement Caddy fits up to 9-shank folding models allowing for easy conversion from a 3-point unit into a pull-type implement. Model 300 for up to 6-shank models and model 500 for up to 9-shank models
  • Pull-Type Conversion packages to fit 4-8 shank rigid machines allow bolt-on conversion from a 3-point unit into a pull-type implement


Model Size Appx. H.P. Range* Transport Width Approx. Weight (lbs.)
Model 730
Auto-Reset Shank
Model 710
Shear-Bolt Shank

*H.P. range determined from 14-inch working depth at 4 m.p.h.

Due to continuing improvements in the design and manufacture of Unverferth products, all specifications contained herein are subject to change without notice.

3 shank 90-120 8'10" 2395 2290
4 shank 120-160 11'5" 2800


5 shank 150-200 13'10" 3310 3130
6 shank 180-240 16'4" 3850 3655
7 shank 210-280 19'2" 4350 4130
8 shank 240-320 21'2" 4745 4435
9 shank (folding wings) 270-360 16'5" 6500 6270