The Sierra PTO Post Hole Borer with Hydraulic Downforce is a tractor-mounted drilling attachment designed for digging post holes, planting trees, and general hole boring 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. Features shear bolt-protected 50 HP gearbox with 2" (50mm) output shaft compatible with most agricultural auger manufacturers. Reinforced 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.
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 weight suitable for compact to large tractors without overloading
Powder-coated reinforced steel frame resists corrosion
Compatible with Sierra augers featuring replaceable hardened steel cutting tips
Specifications
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
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.
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
This monthly repayment estimate is provided by Overdrive Commercial Funding Pty Ltd (Australian Credit License: 389328) This estimate is based on a Chattel Mortgage, which is only available where the purchaser of the item intends to use the item for primarily commercial use. The term of this loan is based 60 months with 30% residual & subject to qualifying commercial assets and credit criteria. Fees and charges are not included in this estimate and may apply. If the item is a vehicle and is not listed with a drive away price, any repayment estimate does not include additional costs, such as stamp duty and other government charges. The term of this loan is 60 months. This estimate should be used for information purposes only and is not an offer of finance on particular terms. This repayment estimate is the estimated lowest repayment available from Overdrive Commercial Funding Pty Ltd’s panel of lenders and products for this specific item each day, and includes several assumptions about the item, purchaser, and loan specifics. All loans are subject to eligibility criteria and Overdrive Commercial Funding Pty Ltd loan approval process. A specific quote including details of all fees and charges, or loans for items with primarily or wholly personal use can be obtained via overdrivefunding.com.au or by calling 1800 954 124.
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