The Stumpster™ Stump Grinder 4000 Series
Don’t get stumped. Clear any stump, anywhere in the US.
The New 4000 Series Stumpster™ is designed for long service life as a high performance stump grinder, just like its predecessor the Stumpster Model 3000-4. It is possible to grind stumps of any size or type of wood.
Our new model has all the same qualities as our model 3000-4, but it features a newly designed wheel. The cutting bits are positioned for cutting in both the forward and the return motion.
Specifications have been improved for better performance and quicker results.
Ideal for use in landscaping, nurseries, farming, construction and utility company application.
Easy mount to tractor 3 point hitch.
Two lever control provides smooth operations, one lever control activates cutting wheel movement through stump and return. Second hydraulic lever regulates rear stabilizers. Depth control lever of tractor regulates depth of cut into stump.
Double bypass valve regulates hydraulic pressure from tractor, maintaining PTO R.P.M. and prevents excessive torque of tractor PTO, regardless of pressure in tractor hydraulic system.
Equipment stands permit quick off-on tractor 3 point hookup. Stands lock in up working position when grinding and down position for storage.
LOW PRESSURE Hydraulic Pressure Relief System built in each machine, regulates operating pressures for smooth safe grinding regardless of pressure system built in tractor.
WELL ENGINEERED Limiter Clutch and Drive Shaft furnished with each machine. Grinder cannot be overpowered by tractor regardless of horse power.
SAFETY 1/4″ Lexan Shield installed on each machine for operator safety.
RUGGED Frame constructed of .250 wall 1040 steel.
PRODUCTIVE Very little or no down time of machine. Simple design eliminates breakdown and keeps machine in the field working.
Tips & Tutorials
Operating RPM (PTO)
Min. PTO H.P.
Max PTO H.P.
Operating RPM (PTO)
Max. Cutting Wheel Clearance
Varies with Tractor
Max. Horizontal Cut
Max. Cutting Depth
Max Cutting Width
Cutting Wheel Diameter
7/8″ x 32″
3 Point Hitch Category
U.S. PATENT #4,530,385 & 4,681,145
Rugged steel construction for long life.
Heavy duty main cutting wheel bearing features long service life.
Three front and rear pillow bearings to ensure durability and smooth operations.
Each grinder is shipped with a preset non-adjustable clutch assembly in the PTO drive line. This assures a maximum working torque desired for the machine and eliminates “shock” to the tractor PTO assembly. Worn clutch pads are easily replaced and inexpensive, requiring no special skills or tools to change.
Double acting tie rod design of hydraulic cylinders enable them to be used in heavy duty application, 2500 PSI working pressure, polyurethane rod wiper, cast malleable rod clevis, automotive type lock-nuts to retain piston on piston rod. Each machine is equipped with 4 hydraulic cylinders.
Tips & Tutorials
IMPORTANT sizing information
Read these instructions before installing the PTO drive shaft.
PTO drive shafts come from the factory long enough to fit all size and type tractors with a 6 spline shaft. On many tractors, the drive shaft will be too long as it comes from the factory. Too long a PTO drive shaft may cause serious damage to the tractor or stump grinder. For proper sizing of the PTO shaft, follow these simple steps:
Collapse the PTO drive shaft to its shortest possible length. Measure from the center of the 3/8″ set screw to the center of the PTO latch pin on the opposite end of the shaft. [For our example – 34″]
With the Stumpster attached, lift the 3 pt. hitch to its maximum up position. Measure from the latch pin groove on the tractor PTO to the set screw indentation on the Stumpster cutting wheel shaft. [For our example – 30″]
If the PTO shaft measurement [Eexample – 34″] is longer than the tractor to stump grinder measurement [Eexample – 30″], the PTO shaft should be pulled apart to two pieces, and the difference of the measurements cut off each half.
34″ PTO shaft collapsed measurement -30″ Tractor to shear bolt measurement 4″ Amount to cut off each half of the PTO shaft