Description
The Problem Solver: The Stinger F4 "Twister" bridges the gap between a standard brush hog and a commercial forestry mulcher. Designed for contractors who need to process 7-inch trees without the $30,000 price tag of a drum mulcher.
The Radial Piston Advantage: Unlike cheaper cutters that use a gearbox (which can break under shock loads), the F4 uses a Direct Drive Radial Piston Motor. This gives you 95% mechanical efficiency and instant torque recovery, with zero gearbox maintenance required.
⚙️ Technical Specifications
Cut Capacity: 7" Diameter Softwood / 4" Hardwood
Motor Tech: Radial Piston (Direct Drive / Bi-Directional)
Blade Carrier: 3/4" AR400 Steel Disc (4-Blade)
Deck Build: 1/4" Grade 50 Steel w/ Reinforced Push Bar
Warranty: 2-Year Deck / 1-Year Motor
⚠️ Setup Requirement: Case Drain
This motor uses a Case Drain (3rd line) to relieve internal pressure.
To protect the motor seals, this line must be connected to your machine's Case Drain coupler (which runs directly to the tank).
Note: Connecting this line to a standard high-flow return port will damage the seals and affect warranty coverage.
✅ Machine Compatibility
Hydraulic Flow: 21 - 45 GPM (Handles Standard OR High Flow automatically).
Confirmed Fit: Bobcat (S650, T770+), Kubota (SVL75, SVL97), CAT (289, 299), John Deere (331, 333), Case, and New Holland.
🤔 Which Version Should I Buy?
- Select Standard: If you are clearing trees/brush in soil or fields with minimal rocks.
- Select Hybrid (+$1,000): If you are working in rocky terrain. The Hybrid adds 9-12 carbide mining teeth to the bottom of the disc to grind stumps into the dirt without damaging the carrier.
Additional Specifications
| Mount Interface | Universal Skid Steer |
| Warranty | 2-Year Deck / 1-Year Motor |
| Required Flow Rate | 21 - 45 GPM |
| Max Operating Pressure | 4000 PSI |
| Teeth Count | 4 |
| Shipping Dimensions (LxWxH) | 88x69x26 |
| Recommended Machine Class | Large Frame (2000lb+ ROC) |
Downloads & Resources
The Griffin Advantage