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.