Overview
The Sierra PTO Post Hole Borer with Hydraulic Downforce is a tractor-mounted drilling attachment designed for digging post holes, planting trees, and general earthworks on farms and lifestyle blocks. Built for 30–100 HP tractors (best suited to 30 HP+) with PTO drive and hydraulic downforce for penetrating harder ground and clay soils. Features a shear bolt-protected 50 HP gearbox with 2" (50mm) output shaft compatible with most agricultural auger manufacturers. Reinforced 100mm x 100mm square steel tube boom with Category 1 and 2 lower linkage holes. Requires one double-acting hydraulic circuit for up/down control. Auger sold separately.
📖 Buying Guide: How to Choose a PTO Post Hole Borer for Your Tractor
Features & Benefits
- Hydraulic downforce applies pressure for drilling through hard ground and clay
- 50 HP shear bolt-protected gearbox prevents damage from unexpected obstacles
- 2" (50mm) output shaft fits industry-standard augers from multiple manufacturers
- Reinforced 100mm x 100mm square steel tube boom for strength and rigidity
- Category 1 and Category 2 lower linkage holes suit 18–100 HP tractors
- Category 2 (25mm) top link pin required for mounting
- PTO shaft with shear bolt yoke included — protects tractor driveline
- Double-acting hydraulic circuit controls up/down movement independently from 3-point linkage
- 130kg working weight suitable for medium to large tractors
- Powder-coated reinforced steel frame resists corrosion
- Compatible with Sierra augers featuring replaceable hardened steel cutting tips
Specifications
| Specification | Value |
|---|---|
| Overall Length | 1930mm |
| Overall Width | 850mm |
| Overall Height | 370mm |
| Weight | 130kg |
| Tractor HP Range | 30–100 HP (best suited to 30 HP+) |
| Top Link | Category 2 (25mm pin required) |
| Lower Linkage | Category 1 and Category 2 holes |
| Frame Size | 100mm x 100mm square tube |
| Frame Material | Reinforced steel with powder-coat finish |
| PTO Shaft | Series 4 with shear bolt yoke (included) |
| Gearbox Rating | 50 HP (shear bolt protected) |
| Output Shaft | 2" (50mm) diameter |
| Hydraulic Requirement | 1 x double-acting circuit |
| Downforce | Hydraulic |
Best For
- Digging post holes for fencing on farms and lifestyle blocks
- Planting trees and shrubs in landscaping and nursery operations
- Installing vineyard and orchard posts
- General earthworks and foundation drilling
- Hard ground and clay soil conditions requiring downforce
Compatibility
- Tractor HP Range: 30–100 HP (best performance with 30 HP+)
- Top Link: Category 2 (25mm pin required)
- Lower Linkage: Category 1 and Category 2 holes (Cat 2 pins supplied)
- PTO: Standard tractor PTO (540 RPM recommended)
- Hydraulic Requirement: 1 x double-acting hydraulic circuit — 3-point linkage must be in float position; auxiliary control operates up/down
- Auger Compatibility: 2" (50mm) output shaft fits most industry-standard augers
What's Included
- 1 x Sierra Post Hole Borer main unit with hydraulic downforce
- 50 HP gearbox with shear bolt protection
- PTO shaft with shear bolt yoke
- Category 2 lower linkage pins
- Hydraulic cylinder and hoses
- Operator's manual
- Auger sold separately
Warranty & Support
Covered by manufacturer's 12-month warranty. Contact us for warranty terms and support.
Shipping & Freight
Freight calculated at checkout based on delivery location. Ships fully assembled and ready to mount on your tractor. Contact us if you require a freight quote prior to purchase.
Important Notes:
- Auger sold separately — choose auger diameter based on your application
- Category 2 (25mm) top link pin required for mounting (not included)
- 3-point linkage hydraulics must be in float position during operation
- Use auxiliary hydraulic control to operate up/down movement