Overview
The Sierra PTO Post Hole Borer (18–100HP) is a heavy-duty 3-point linkage drilling attachment suited to tractors from 18–100 HP, best suited to 35 HP and above. Designed for landscapers, lifestyle block owners, nurseries, and farmers needing a robust borer for post holes and tree planting. Features a reinforced 100mm square steel tube boom and shear bolt-protected gearbox. Auger sold separately. Ships flat-packed — assembly required.
📖 Buying Guide: How to Choose a PTO Post Hole Borer for Your Tractor
Features & Benefits
- Shear bolt-protected 50 HP gearbox — protects tractor driveline from unexpected obstacles
- 2" (50mm) output shaft compatible with most auger manufacturers
- Reinforced 100mm x 100mm square steel tube boom for strength and rigidity
- CAT 1 and CAT 2 lower linkage holes — suits 18–100 HP tractors
- Requires CAT 1 (19mm) top link pin for mounting
- Category 2 lower pins supplied
- Best suited to 30 HP+ due to weight and frame strength
- Replaceable hard steel cutting tips on Sierra augers — most common replaceable tip standard available
- PTO shaft with shear bolt yoke included
Specifications
| Specification | Value |
|---|---|
| Overall Length | 1930mm |
| Overall Width | 850mm |
| Overall Height | 370mm |
| Weight | 130kg |
| Tractor HP Range | 18–100 HP (best suited to 35 HP+) |
| Top Link | CAT 1 (19mm) |
| Lower Linkage | CAT 1 and CAT 2 lower linkage holes |
| Frame Size | 100mm x 100mm square tube |
| Frame Material | Reinforced steel |
| PTO Shaft | Series 4 with shear bolt yoke (included) |
| Gearbox Rating | 50 HP (shear bolt protected) |
| Output Shaft | 2" (50mm) diameter |
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 hole boring on medium to large tractors
Compatibility
- Tractor HP Range: 18–100 HP (best performance with 35 HP+)
- Top Link: CAT 1 (19mm pin required)
- Lower Linkage: CAT 1 and CAT 2 lower linkage holes (Cat 2 pins supplied)
- Output Shaft: 2" (50mm) — fits most industry-standard augers
- Note: For tractors under 30 HP, see our Compact Tractor Post Hole Borer
What's Included
- 1 x Sierra PTO Post Hole Borer main unit
- 50 HP gearbox with shear bolt protection
- PTO shaft with shear bolt yoke
- Category 2 lower linkage pins
- 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 flat-packed — assembly required. Contact us if you require a freight quote prior to purchase.