BLUE DIAMOND Auger Drive - Extreme Duty Series 2

The Blue Diamond Extreme Duty Series 2 Auger Drive is engineered for serious digging with skid steers, delivering deep, precise holes in a wide range of ground conditions. Its compact, high-torque gearbox and two-piece shaft design maximize drilling depth while minimizing downtime, so you can complete more jobs in less time.

Features

Compact high-torque gearbox for efficient power transfer
2-piece shaft design to maximize side-load ratings and durability
Gearbox designed to extend down the hole, increasing drilling depth and reducing downtime
Wide compatibility across models: standard 2" HEX shaft (EX1–EX4); 2" HEX or 2.5" HEX on HF models
Robust warranty package: 5-year gearbox, 3-year motor, lifetime shaft pull-out
Available in a full lineup (EX1–EX7HF) to match flow, pressure, and bit size needs
High-performance hydraulics: tuned for up to 30 GPM in standard units and up to 42 GPM with HF configurations
Built to handle large-hole work: clay and dirt hole sizes scaled by model, with HF variants offering larger clay and dirt capacities

Use case overview by model

EX1–EX4: Ideal for standard to mid-range hole sizes and soil conditions. Torque ranges from 1,467 to 3,275 with 6–16 GPM (EX1) up to 10–30 GPM (EX4). Capable of drilling clay holes up to 12" and dirt holes up to 24–30".
HF models (EX4HF–EX7HF): Built for higher flow and larger holes. Torque ranges from 3,583 to 6,162 with 10–36 GPM (and peaks to 21–26 GPM). Bit sizes extend to 24"–40" clay and 40"–48" dirt, depending on the exact model, with higher flow and horsepower options.

Benefits

Maximize drilling depth without sacrificing reliability. The Extreme Duty Series 2 auger drives down the hole, enabling deeper post-hole drilling and more complete trenching in a single setup. The 2-piece shaft and rugged gear train withstand demanding side loads, reducing wear and downtime on busy projects. The broad model lineup ensures you can match your skid steer’s hydraulic capacity to the task, from compact fence-post holes to large-diameter soil borings.

Who this is for: professional landscapers, fence installers, deck builders, concrete contractors, rental fleets, and anyone using a skid steer for heavy-duty auger work. It’s particularly well-suited for environments with hard clay, dense soil, or variable ground conditions where downtime and tool wear can impact project timelines.

Practical tips for best results:

Match the HF models to higher flowing hydraulic systems to unlock larger hole capacities and faster drilling.
Use the correct bit size within the model’s clay and dirt limits to optimize wear and drilling efficiency.
Leverage the gearbox-down-hole capability to achieve maximum depth on challenging soils, reducing the need for repositioning.
Ensure the skid steer hydraulic capacity aligns with the model’s GPM and PSI requirements for steady, reliable performance.
Take advantage of the extended warranties for peace of mind on demanding projects.

MODEL	EX1	EX2	EX3	EX4
PART #	305705	305708	305712	305715
TORQUE / 3000PSI	1467	2254	2829	3275
TORQUE MAX	1712	2630	3300	3821
FLOW RANGE GPM	6-16	10-26	10-30	10-30
PEAK GPM	8-11	12-16	17-20	19-23
MOTOR	EATON	EATON	EATON	EATON
MAX PSI	3500 psi @ 16 gpm	3500 psi @ 16 gpm	3500 psi @ 16 gpm	3500 psi @ 16 gpm
MAX FLOW	30 gpm @ 1800 psi	30 gpm @ 1800 psi	30 gpm @ 1800 psi	30 gpm @ 1800 psi
MAX HP	33	33	33	33
RELIEF VALVE	N/A	N/A	N/A	N/A
STD SHAFT	2" HEX	2" HEX	2" HEX	2" HEX
MAX BIT (CLAY)	12"	24"	24"	24"
MAX BIT (DIRT)	24"	30"	30"	30"
WEIGHT	101	123	123	123
LENGTH	24.5″	25.9″	25.9″	25.9″
DIAMETER	7.4"	9.4″	9.4″	9.4″

MODEL	EX4HF	EX5HF	EX6HF	EX7HF
PART #	305720	305725	305728	305730
TORQUE / 3000PSI	3583	3903	4909	6162
TORQUE MAX	4180	4553	5728	7189
FLOW RANGE GPM	10-36	10-36	12-36	14-36
PEAK GPM	21-26
MOTOR	EATON	EATON	EATON	EATON
MAX PSI	3500 psi @ 27 gpm	3500 psi @ 27 gpm	3500 psi @ 27 gpm	3500 psi @ 27 gpm
MAX FLOW	42 gpm @ 2250 psi
MAX HP	55	55	55	55
RELIEF VALVE	INCLUDED	INCLUDED	INCLUDED	INCLUDED
STD SHAFT	2" HEX	2.5" HEX	2.5" HEX	2.5" HEX
MAX BIT (CLAY)	24"	24"	30"	30"
MAX BIT (DIRT)	40"	40"	40"	48"
WEIGHT	180	290	290	290
LENGTH	29″	33.7″	33.7″	33.7″
DIAMETER	9.4"	11.4″	11.4″	11.4″

MODEL	MAX CLAY	MAX DIRT
EX1	12"	24"
EX2	24"	30"
EX3	24"	30"
EX4	24"	30"
EX4HF	24"	40"
EX5HF	30"	40"
EX6HF	30"	40"
EX7HF	30"	48"

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