{"id":372,"date":"2026-03-16T08:15:40","date_gmt":"2026-03-16T08:15:40","guid":{"rendered":"https:\/\/metalite.net\/?post_type=product&p=372"},"modified":"2026-03-16T08:55:46","modified_gmt":"2026-03-16T08:55:46","slug":"45hp-post-hole-digger-gearbox-2-921","status":"publish","type":"product","link":"https:\/\/metalite.net\/sv\/produkt\/45hp-post-hole-digger-gearbox-2-921\/","title":{"rendered":"45HP Post Hole Digger Gearbox 2.92:1 | PTO Auger Gearbox"},"content":{"rendered":"

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Agricultural Gearbox \u2014 EPG Canada sales representative Co., Ltd \/ HZPT<\/p>\n

HZPT 45 HP Post Hole Digger Gearbox | 2.92:1 Right-Angle Drive, 3-Pt Hitch<\/h2>\n

This post hole digger gearbox is a 45 HP, right-angle bevel gear unit built for 3-point hitch post hole digger attachments. It converts horizontal PTO shaft rotation to a vertical 2″ output at a fixed 2.92:1 step-down ratio, delivering the torque multiplication needed to drive auger bits through clay, rocky soil, and hardpan. The 1-1\/4″ round input shaft accepts standard 540 RPM tractor PTO output, and the dual 1\/2″ output shaft holes provide a secure, two-bolt auger mounting. At 55 lbs with a ductile iron housing, it is a direct-fit replacement for SpeeCo Model 65 & Compact, CountyLine, AgKNX Model 650, and Tool-Tuff Model 650 & 1000 post hole digger units \u2014 no drilling, no shimming, no fabrication required.<\/p>\n<\/div>\n

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45 HP<\/div>\n
Max Power Rating<\/div>\n<\/div>\n
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2.92:1<\/div>\n
Gear Ratio<\/div>\n<\/div>\n
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90\u00b0<\/div>\n
Output Angle<\/div>\n<\/div>\n
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55 lbs<\/div>\n
Weight<\/div>\n<\/div>\n
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2″<\/div>\n
Output Shaft Dia.<\/div>\n<\/div>\n
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540<\/div>\n
PTO Input RPM<\/div>\n<\/div>\n<\/div>\n
\"45HP

45HP Post Hole Digger Gearbox 2.92:1<\/p><\/div>\n

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45HP Post Hole Digger Gearbox Technical Specifications<\/h2>\n

Shipped without oil. Fill with 80W-90 gear oil<\/strong> before first use. Fill plug located on rear of housing.<\/p>\n

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\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Power Rating<\/td>\n45 HP<\/td>\n<\/tr>\n
Gear Type<\/td>\nStraight bevel (right angle)<\/td>\n<\/tr>\n
Gear Ratio<\/td>\n2.92 : 1<\/td>\n<\/tr>\n
Input Shaft<\/td>\n1-1\/4″ Round, smooth \u2014 3\/8″ cross-pin hole<\/td>\n<\/tr>\n
Output Shaft<\/td>\n2″ Round, smooth \u2014 dual 1\/2″ auger mounting holes<\/td>\n<\/tr>\n
Output Direction<\/td>\n90\u00b0 (right angle) \u2014 vertical output<\/td>\n<\/tr>\n
Mounting Pin Diameter<\/td>\n7\/8″<\/td>\n<\/tr>\n
Mounting Ear Spread<\/td>\n4-1\/4″ between mounting ears<\/td>\n<\/tr>\n
Housing Material<\/td>\nDuctile iron, black powder-coat finish<\/td>\n<\/tr>\n
Weight<\/td>\n55 lbs (25 kg)<\/td>\n<\/tr>\n
Guards Included<\/td>\nYes \u2014 input and output shaft guards included<\/td>\n<\/tr>\n
Oil Fill<\/td>\nShipped DRY \u2014 fill with 80W-90 gear oil before use<\/td>\n<\/tr>\n
PTO Input Speed<\/td>\n540 RPM (standard tractor PTO)<\/td>\n<\/tr>\n
Compatible OEM Models<\/td>\nSpeeCo Model 65 & Compact \u00b7 CountyLine \u00b7 AgKNX Model 650 \u00b7 Tool-Tuff Model 650 & 1000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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What Is a Post Hole Digger Gearbox and What Does It Do?<\/h2>\n

A post hole digger gearbox is the power-transfer core of a tractor-mounted auger attachment. It sits between the PTO driveshaft and the auger bit, solving a specific mechanical problem: the tractor’s PTO spins horizontally at 540 RPM, but the auger needs to spin vertically and at a lower speed with higher torque. A right-angle bevel gearbox changes the shaft direction by 90\u00b0 and steps down the speed at a 2.92:1 ratio \u2014 so for every 2.92 rotations of the input, the auger turns once, with nearly three times the input torque applied to the bit.<\/p>\n

Without this torque multiplication, a tractor PTO shaft connected directly to an auger bit would either stall in firm soil or spin so fast that the bit would skip off the surface instead of cutting in. The 2.92:1 ratio in this unit is the standard configuration for 30\u201345 HP compact and utility tractors \u2014 enough torque for 6″, 9″, and 12″ auger bits in most soil types, including compacted clay and dry hardpan found across the Canadian prairies and BC interior.<\/p>\n

This specific unit is a direct-fit replacement gearbox<\/strong>, not a universal adaptor. The 4-1\/4″ ear spacing, 7\/8″ mounting pin, 1-1\/4″ input, and 2″ output dimensions are shared across multiple OEM brands, which is why a single HZPT unit can replace SpeeCo, CountyLine, AgKNX, and Tool-Tuff units without any modification.<\/p>\n

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Working Principle & Component Breakdown<\/h2>\n

Power flow through this post hole digger gearbox follows a straight path: tractor PTO \u2192 input shaft \u2192 bevel gear set \u2192 output shaft \u2192 auger bit. Each component in that path is sized for the 45 HP load rating, with a ductile iron housing providing the structural rigidity to hold the gear mesh alignment under the lateral and axial forces that occur when an auger bites through roots, rocks, and layered soil.<\/p>\n

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\u2460 Input Shaft<\/div>\n
1-1\/4″ Round, 540 RPM<\/div>\n

Accepts the PTO driveshaft coupler. The 3\/8″ cross-pin hole allows a shear pin to be fitted for overload protection \u2014 when the auger hits an immovable obstruction, the pin shears before the gearbox internals are damaged.<\/p>\n<\/div>\n

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\u2461 Bevel Gear Set<\/div>\n
Straight cut, 2.92:1 ratio<\/div>\n

Two meshed bevel gears \u2014 one on the input shaft, one on the output shaft \u2014 redirect rotation 90\u00b0 and amplify torque. The straight-cut profile is less sensitive to axial alignment errors than spiral bevel gears, which matters in field conditions where housing deflection occurs under heavy load.<\/p>\n<\/div>\n

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\u2462 Ductile Iron Housing<\/div>\n
Line-bored, black powder-coat<\/div>\n

Ductile iron (ISO 1083 GJS-400) is chosen over grey cast iron for its ability to flex rather than crack under impact \u2014 critical when a 9″ auger bit strikes an unexpected boulder. The housing is line-bored after casting to ensure input and output bore axes are exactly perpendicular, keeping gear mesh geometry correct over the service life.<\/p>\n<\/div>\n

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\u2463 Output Shaft<\/div>\n
2″ Round, dual 1\/2″ holes<\/div>\n

The 2″ diameter provides the cross-sectional area to transmit the full torque load to the auger hub. Two 1\/2″ cross-holes spaced 90\u00b0 apart allow a double-bolt or cross-pin auger attachment method, giving more secure engagement than a single-pin design.<\/p>\n<\/div>\n

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\u2464 Mounting Ears & Pin<\/div>\n
4-1\/4″ spread, 7\/8″ pin<\/div>\n

The mounting ears bolt or pin to the post hole digger frame. The 4-1\/4″ inside-ear dimension and 7\/8″ pin diameter are the industry-standard configuration for this gearbox class, enabling the direct OEM interchangeability across SpeeCo, CountyLine, AgKNX, and Tool-Tuff frames.<\/p>\n<\/div>\n

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\u2465 Shaft Guards<\/div>\n
Input & output \u2014 included<\/div>\n

Rotating PTO shafts and auger stubs are legally required to be guarded in most Canadian provinces (OHSA, farm safety regulations). Guards are included in the box \u2014 not sold separately. Install them before first use.<\/p>\n<\/div>\n<\/div>\n

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Where This Post Hole Digger Gearbox Gets Used<\/h2>\n

The 45 HP rating and 2.92:1 ratio make this gearbox suited to any application where a 30\u201345 HP tractor drives a 3-point hitch post hole digger. The following six scenarios represent its most common uses across Canadian farms and land operations.<\/p>\n

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Livestock & Pasture Fencing<\/div>\n
AB \u00b7 SK \u00b7 MB \u00b7 BC Ranches<\/div>\n<\/div>\n
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Fence post installation for cattle, horse, and hog operations. A 6″ or 9″ auger on this post hole digger gearbox cuts through the clay and glacial till common in Prairie topsoil. Post spacing for livestock perimeter fencing runs 8\u201310 feet \u2014 a typical quarter-section fence job requires 400\u2013600 holes.<\/p>\n<\/div>\n<\/div>\n

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Vineyard & Orchard Post Setting<\/div>\n
Okanagan BC \u00b7 Niagara ON<\/div>\n<\/div>\n
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Trellis post installation in established orchards and vineyards. The 45 HP rating handles the rocky, root-laced soil of BC Okanagan hillside vineyards. A 6″ auger allows tight post placement between vine rows where larger equipment can’t manoeuvre.<\/p>\n<\/div>\n<\/div>\n

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Rural Building Construction<\/div>\n
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Pole barns \u00b7 Equipment sheds<\/div>\n<\/div>\n
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Drilling the 12″\u201318″ diameter holes required for pole barn and Quonset hut foundation posts. The 2.92:1 step-down ratio provides adequate torque for a 12″ auger bit in medium-hard soil \u2014 the upper limit for a 45 HP tractor in this configuration.<\/p>\n<\/div>\n<\/div>\n

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Windbreak & Tree Planting<\/div>\n
Prairie shelter belt programs<\/div>\n<\/div>\n
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Government-assisted shelter belt and woodlot planting programs across Saskatchewan and Manitoba require hundreds of planting holes per day. The 540 RPM input and 2.92:1 ratio give a cycle time of 30\u201360 seconds per hole in loam, keeping up with a two-person planting crew.<\/p>\n<\/div>\n<\/div>\n

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Rural Road & Signage<\/div>\n
Municipalities \u00b7 Rural property<\/div>\n<\/div>\n
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Road sign post installation and rural mailbox post setting for municipalities and rural property owners. The direct-fit compatibility with CountyLine and SpeeCo attachments makes this a straightforward replacement when a municipal or county-owned digger needs a new gearbox mid-season.<\/p>\n<\/div>\n<\/div>\n

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Deck & Dock Foundation<\/div>\n
Residential \u00b7 Seasonal structures<\/div>\n<\/div>\n
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Helical pier and concrete tube foundation holes for residential decks, docks, and outbuildings. A compact utility tractor with a 3-point post hole digger and this gearbox can drill below frost line (typically 3\u20134 feet in BC, 4\u20136 feet in Alberta) in under 3 minutes per hole in average soil.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Post Hole Digger Gearbox Maintenance Schedule & Procedures<\/h2>\n

The most common cause of post hole digger gearbox failure is not mechanical wear \u2014 it is running dry. This unit ships without oil. A gearbox operated even briefly without 80W-90 gear oil will score the bevel gear faces and spin the input shaft bearings in their races within minutes of running under load. Oil the gearbox before the first hole, not after the first problem.<\/p>\n

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\u26a0 Shipped Dry \u2014 Oil Before First Use<\/div>\n

Remove the rear 1\/4″ fill plug and pour 80W-90 gear oil through the top plug hole until oil begins to run from the rear plug opening. Reinstall and tighten both plugs before operating. Approximate fill volume: 0.5\u20130.75 litres depending on orientation.<\/p>\n<\/div>\n

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Interval<\/th>\nTask<\/th>\nNotes<\/th>\n<\/tr>\n<\/thead>\n
Before first use<\/td>\nFill with 80W-90 gear oil<\/td>\nUnit ships dry. Do not operate without oil.<\/td>\n<\/tr>\n
First 10 hours<\/td>\nDrain and refill oil<\/td>\nBreak-in period produces fine metal particles. Drain regardless of oil appearance.<\/td>\n<\/tr>\n
Every season<\/td>\nFull oil change<\/td>\n80W-90 gear oil. Inspect drain plug for metallic paste, which indicates accelerated wear.<\/td>\n<\/tr>\n
Every season<\/td>\nInspect input & output shaft seals<\/td>\nOil weeping around shaft entry = worn lip seal. Replace before seal failure causes full oil loss.<\/td>\n<\/tr>\n
Every use<\/td>\nCheck shear pin \/ cross pin<\/td>\nA sheared pin means the auger hit an immovable obstruction. Inspect for bent output shaft before replacing pin.<\/td>\n<\/tr>\n
Storage<\/td>\nInspect guards, clean housing<\/td>\nRemove soil buildup around shaft seals. Store indoors or cover to prevent water pooling around input\/output shaft entry points.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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Products That Work With This Gearbox<\/h2>\n

The following EPG Canada Sales Representative Co., Ltd \/ HZPT products are directly compatible with this post hole digger gearbox or commonly ordered alongside it.<\/p>\n

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PTO Drive Shafts<\/div>\n
540 RPM PTO Shaft \u2014 Shear Pin<\/div>\n

Category 1 shear-pin PTO shaft connects the tractor PTO to the 1-1\/4″ gearbox input. Shear-pin protection prevents driveline damage when the auger hits an obstruction. Available in standard and heavy-duty series.<\/p>\n

View PTO Shafts \u2192<\/a><\/p>\n<\/div>\n<\/div>\n

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Roller Chain & Sprockets<\/div>\n
Agricultural Roller Chain #40\u2013#60<\/div>\n

Used in post hole digger frames that use chain drive rather than direct PTO connection. Also the right product for seeder, tiller, and spreader side drives on the same tractor. ANSI-standard pitches, available by the foot or in master-link boxes.<\/p>\n

View Chain & Sprocket \u2192<\/a><\/p>\n<\/div>\n<\/div>\n

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Agricultural Gearboxes<\/div>\n
Right-Angle Bevel Gearbox \u2014 Adjustable<\/div>\n

For post hole digger frames where the mounting angle cannot be fixed at 90\u00b0. Adjustable-housing bevel gearbox allows output shaft orientation to be set from 0\u00b0 to 90\u00b0 during installation. Useful for hillside installations or non-standard frame designs.<\/p>\n

View Bevel Gearboxes \u2192<\/a><\/p>\n<\/div>\n<\/div>\n

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Couplings<\/div>\n
PTO Shaft Yoke & Cross Kit<\/div>\n

Universal joint cross and yoke kits for rebuilding worn PTO shafts. A worn U-joint causes angular vibration that accelerates wear on the post hole digger gearbox input shaft bearing \u2014 replace the U-joint before it reaches the gearbox. Fits 1-1\/4″ and 1-3\/8″ PTO shafts.<\/p>\n

View PTO Components \u2192<\/a><\/p>\n<\/div>\n<\/div>\n

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Hydraulic Cylinders<\/div>\n
3-Point Hitch Hydraulic Cylinder<\/div>\n

Used on post hole digger frames where a hydraulic down-pressure cylinder assists the auger into hard ground. Particularly useful in BC Interior and Alberta where caliche and hardpan layers resist gravity-feed penetration. Bore 2″\u20133″, stroke 6″\u201318″.<\/p>\n

View Hydraulic Cylinders \u2192<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Frequently Asked Questions \u2014 Post Hole Digger Gearbox<\/h2>\n
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Q1. Will this post hole digger gearbox fit my SpeeCo Model 65 or CountyLine digger?<\/div>\n

Yes \u2014 if your existing gearbox has a 4-1\/4″ inside ear spread, a 7\/8″ mounting pin, a 1-1\/4″ round input shaft, and a 2″ round output shaft, this unit is a bolt-in replacement. These are the standard dimensions for the SpeeCo Model 65 & Compact, CountyLine, AgKNX Model 650, and Tool-Tuff Model 650 & 1000. To confirm before ordering: measure across the inside faces of your mounting ears and the diameter of both shafts. If the numbers match, the gearbox will drop straight in. If you are unsure, email us a photo of your existing unit to sales@metalite.net<\/strong><\/a> \u2014 we will confirm compatibility within one business day.<\/p>\n<\/div>\n<\/div>\n

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Q2. What oil do I use, and how much does it take?<\/div>\n

80W-90 gear oil<\/strong> is the correct specification. SAE 90 or 85W-90 are acceptable alternatives. Do not use motor oil, hydraulic fluid, or 10W-30 \u2014 these lack the extreme pressure (EP) additives needed to protect the bevel gear tooth faces under load. To fill: remove the 1\/4″ rear plug and pour oil into the top hole until it begins running out the rear opening. The fill volume is approximately 0.5\u20130.75 litres. Reinstall both plugs snugly before running the unit. Change the oil after the first 10 operating hours to remove break-in metal particles, then once per season thereafter.<\/p>\n<\/div>\n<\/div>\n

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Q3. My gearbox sheared the input pin \u2014 does that mean the gearbox is damaged?<\/div>\n

Not necessarily \u2014 the shear pin is a deliberate sacrificial component. It is designed to break before the gearbox internals are damaged when the auger hits an immovable obstruction such as a buried rock, old tree root, or frozen soil layer. After a shear, inspect the output shaft for bend by rotating it by hand and checking for runout. If the shaft spins true and the housing shows no cracks, install a new shear pin of the correct diameter and resume operation. If the output shaft is bent or you hear grinding after reinstalling the pin, the internal gears may have been damaged before the pin failed \u2014 contact us for a replacement unit.<\/p>\n<\/div>\n<\/div>\n

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Q4. Can I use this gearbox on a 50 HP or 60 HP tractor?<\/div>\n

The 45 HP post Hole digger gearbox rating is the sustained-use maximum for this gearbox. Running it at full throttle on a 50\u201360 HP tractor may not immediately destroy the unit, but operating above the rated HP accelerates gear face wear and input shaft bearing fatigue, typically reducing service life from several hundred hours to under 50. For tractors above 45 HP, we stock the 75 HP version of this post hole digger gearbox, which uses the same mounting dimensions so it is a direct swap on the same frame. If you are running a 9″ or 12″ auger in dense soil at full tractor throttle, the 75 HP unit is the correct choice.<\/p>\n<\/div>\n<\/div>\n

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Q5. How long does shipping take to Alberta or Saskatchewan?<\/div>\n

In-stock orders placed before 2:00 PM PST ship same business day from our Richmond, BC warehouse. Transit time to central Alberta (Red Deer, Lacombe, Camrose) is typically 3\u20134 business days by ground courier. To Saskatoon or Regina it is 4\u20135 business days. If your post hole digger is down during fencing season and you need the gearbox faster, call us at +1-604-719-2870<\/strong> before noon PST \u2014 we can arrange next-day air to most Alberta and Saskatchewan cities for an additional freight surcharge.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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45HP Post Hole Digger Gearbox Customer Reviews<\/h2>\n

Verified purchases from Canadian farms, ranches, and land operations.<\/p>\n

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4.8<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n
23 reviews<\/div>\n<\/div>\n
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5<\/span><\/p>\n

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19<\/span><\/p>\n<\/div>\n

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T. Bergstrom <\/strong><\/h3>\n

\u2014 Swift Current, Saskatchewan\u00a0<\/strong><\/h3>\n

“We install rural fencing commercially \u2014 go through a gearbox every 1\u20132 seasons. This HZPT unit has lasted two full seasons so far with no issues. OEM replacements ran $280\u2013$320 from the dealer. Paid considerably less here with the same performance.”<\/p>\n<\/div>\n

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G. Kowalczyk <\/strong><\/h3>\n

\u2014 Leduc County, Alberta\u00a0<\/strong><\/h3>\n

“Ordered Tuesday afternoon from Richmond. Arrived in Edmonton Thursday morning. Two days for a gearbox during fencing season \u2014 that’s what matters. The unit itself is solid, heavier than the original CountyLine part, which I take as a good sign.”<\/p>\n<\/div>\n

 <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

The 45HP Post Hole Digger Gearbox with a 2.92:1 ratio is designed for reliable power transmission in tractor-mounted augers. Built with a durable ductile iron housing and precision bevel gears, it efficiently converts 540 RPM PTO input into high torque for smooth drilling. Ideal for agricultural, fencing, and landscaping applications, it provides stable performance, long service life, and easy replacement for common post hole digger models.<\/p>","protected":false},"featured_media":373,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[25,19,26,18],"product_tag":[],"class_list":{"0":"post-372","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-agricultural-gearbox","7":"product_cat-reducer","8":"product_cat-post-hole-digger-gearbox","9":"product_cat-products","11":"first","12":"instock","13":"shipping-taxable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/metalite.net\/sv\/wp-json\/wp\/v2\/product\/372","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/metalite.net\/sv\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/metalite.net\/sv\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/metalite.net\/sv\/wp-json\/wp\/v2\/media\/373"}],"wp:attachment":[{"href":"https:\/\/metalite.net\/sv\/wp-json\/wp\/v2\/media?parent=372"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/metalite.net\/sv\/wp-json\/wp\/v2\/product_brand?post=372"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/metalite.net\/sv\/wp-json\/wp\/v2\/product_cat?post=372"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/metalite.net\/sv\/wp-json\/wp\/v2\/product_tag?post=372"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}