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Sierra PTO Post Hole Borer - Heavy Duty (No Auger)

Sierra

$1,395.00 NZD inc GST

$1,213.05 NZD exc GST

Overview

The Sierra PTO Post Hole Borer (18โ€“100HP) is a heavy-duty 3-point linkage drilling attachment suited to tractors from 18โ€“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 โ€” assembly required.

๐Ÿ“– Buying Guide: How to Choose a PTO Post Hole Borer for Your Tractor

Features & Benefits

  • Shear bolt-protected 50 HP gearbox โ€” 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 โ€” suits 18โ€“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 โ€” 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 18โ€“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: 18โ€“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) โ€” 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 โ€” assembly required. Contact us if you require a freight quote prior to purchase.

PTO Post Hole Borers โ€” Common Questions

What auger size do I need for fence posts?

For standard timber fence posts, a 6" to 9" auger is typical; for strainer posts or larger assemblies, 12" and up. Check your council or regional requirements too, as some areas specify minimum hole diameters for strainers.

Does the auger come with the borer, or is it separate?

On most of our post hole borer listings the auger is sold separately, so you can choose the exact diameter you need โ€” check the individual product page, as this varies by model.

What PTO speed does a post hole borer need?

Post hole borers are gearbox-driven and typically rated for 540 RPM PTO input โ€” check the product listing to confirm, and never run one above its rated speed, as it puts excessive load on the gearbox and auger.

Is a hydraulic down-force borer worth it over a standard one?

A hydraulic down-force borer pushes the auger into the ground under power rather than relying on the tractor's three-point linkage to push down, which makes a real difference in hard, dry or rocky ground. For soft or well-worked soil, a standard borer is usually enough.

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