Rock Digger For Skid-Steers - Haugen Attachments

📘 Overview

The Haugen rock digger skid steer attachment is a heavy-duty tine for prying for prying, digging, and lifting boulders and large rocks from the ground. Two models: MRD 36 (36" AR 400 steel tines, 45" frame, 8" tine spacing, 480 lbs) and HRD 31 (31" AR 400 steel tines, 3/4" cutting edge). Both use 1" thick AR 400 steel tines with 8" spacing, a heavy-duty backrest, and a heavily gusseted Universal Quick Attach. Made in USA with a 1-year warranty.

⚙️ Key Features

• MRD 36: 36" tines | 45" frame width | 8" tine spacing | 34" frame height | 480 lbs
• HRD 31: 31" tines | 3/4" cutting edge | AR 400 steel tines
• 1" thick tines made from AR 400 steel
• 8" spacing between tines
• Heavy-duty backrest
• Heavily gusseted Quick Attach
• Universal Quick Attach | Made in USA | 1-year warranty

🔑 Benefits

• AR 400 steel tines are designed to resist impact and abrasion in rock and boulder work — AR 400 is an abrasion-resistant steel with approximately 400 BHN (Brinell Hardness). This hardness level prevents the tine tips from rounding off quickly against rock surfaces, maintaining the digging and prying geometry. Standard mild steel tines at ~120-150 BHN would wear smooth within hours in rock work, losing all prying ability.
• 1" thick tines resist bending and breakage under high prying loads — prying a large boulder involves applying significant lateral force through the tine tip as the lever arm. At 1" thickness and AR 400 hardness, the tines can withstand the bending stress of prying without deforming. Thin tines (3/8"-1/2") in rock digger service bend or snap under these loads.
• 8" tine spacing passes fines and soil while capturing rocks above 8" — as the rock digger penetrates the ground, loose soil falls through the 8" gaps while rocks larger than 8" are captured between tines. This reduces the soil volume that must be managed separately and concentrates the rock for extraction or transport.
• Gusseted Quick Attach transfers loader forces directly to the tine structure — during prying operations, the loader arms generate very high forces on the QA interface. Gusseting adds structural reinforcement at the QA-to-frame joint, preventing fracture at the stress concentration that occurs when prying a boulder that suddenly releases.

📊 Specifications

🔗 Attachment Compatibility

Universal Quick Attach. At 480 lbs (MRD 36), rock loading adds significant additional weight during operation. Verify machine rated operating capacity before prying large boulders. No hydraulics required beyond loader arm raise/lower and tilt.

🚜 Machine Compatibility

Compatible with skid steer loaders and compact track loaders with Universal Quick Attach:

Verify auxiliary hydraulic flow rate (GPM) and back-pressure requirements match your machine's aux circuit capabilities before operating.

❓ FAQs