A rock rake separates rocks, roots, and debris from soil using rigid or powered tines, leaving finer dirt behind.
Rocks in a seedbed wreck mower blades, raise mowing costs, and stall planting. A rock rake fixes the problem by combing through the top layer of ground, letting small soil particles sift down while pushing larger material into a row you can collect later. The tool comes in pull-behind, skid-steer, and excavator-mounted versions, and picking the wrong style for your carrier wastes money fast.
How Does a Rock Rake Separate Rocks From Soil?
A rock rake works on one simple principle: the gaps between its tines are wide enough for soil to fall through but too narrow for rocks to pass. A conventional landscape rake gets dragged or pushed across the ground, and its angled teeth scarify, level, and aerate the soil while sweeping rocks and debris into windrows.
Powered models swap muscle for hydraulics. A hydraulic motor or PTO-driven rotor spins hardened tines that comb the surface or shallow soil, sifting fine dirt while gathering larger rocks and debris. Collected material either drops into a windrow for later pickup, discharges into a pile, or stays in an integrated hopper or bucket.
Grapple-style rock rakes add a third method. Independent hydraulic forks grip uneven loads, and the tine spacing lets dirt sift out while the rake holds the rock. That makes grapple versions useful when you need to carry material rather than just push it.
Documented Models and What They Cost
Two widely referenced models show how differently rock rakes are built. Caterpillar lists the LR116 with a 62-inch working width, a 54.5-inch raking width, 372 hard-face tines, a 0.4-cubic-yard struck bucket capacity, and a 1,311.7-pound weight. Its rock-size range runs 0.75 to 6 inches, and it needs 11 to 23 gallons per minute at 2,100 to 3,400 psi to run properly.
McLaren takes the grapple route with its OEM-Series rock grapple bucket, built in 66-, 72-, 78-, and 84-inch widths. The tines are 0.5 inch thick with 3-inch spacing, and two 2-by-10-inch cylinders drive independent forks that open slightly more than 31 inches.
McLaren displays a starting price of $2,650 for the OEM-Series grapple, and the page does not date that figure. Neither McLaren nor Caterpillar publishes a current list price for the LR116, so treat any quoted number as dealer-specific.
| Specification | Caterpillar LR116 | McLaren OEM-Series Grapple |
|---|---|---|
| Working width | 62 inches | 66–84 inches |
| Tines | 372 hard-face tines | 0.5-inch-thick tines, 3-inch spacing |
| Weight | 1,311.7 pounds | Not published on the OEM page |
| Rock-size range | 0.75–6 inches | Not published on the OEM page |
| Hydraulic requirement | 11–23 gpm at 2,100–3,400 psi | Two 2-by-10-inch cylinders |
| Collection method | Powered rotor, windrow or bucket | Independent hydraulic forks |
| Listed price | Not published by the manufacturer | $2,650 starting, undated on page |
When a Rock Rake Is the Right Tool
A rock rake earns its keep when the main job is pulling surface and shallow-subsurface rocks out of ground you plan to use. That covers seedbed preparation, site cleanup after construction, reclaiming disturbed ground, shaping drainage and ditches, and terracing. It also handles reforestation work, golf-course maintenance, and the pre-mowing pass on pasture where scattered rock would otherwise chew up equipment.
The tool is also the right call when you want to keep your soil. A rock rake consolidates rock and debris without hauling away large amounts of usable dirt, which matters on shallow or expensive topsoil.
A plain landscape rake suits lighter grading, spreading, soil conditioning, and general debris gathering. Step up to a powered rotor or grapple model when rock loads are heavy, when the work repeats commercially, or when material has to be collected instead of merely windrowed. If your ground is mostly loose surface stone and you want the simplest tool that clears it, browsing a tested roundup of the best rake options for rocky ground narrows the field quickly.
Match the Attachment to Your Carrier
Rock rakes mount through three-point hitch categories, skid-steer quick attach, excavator pin geometry, or hydraulic couplers, and those systems are not interchangeable. Before you buy, confirm the carrier’s lift capacity against the attachment’s weight — the LR116 alone weighs over 1,300 pounds. Verify hydraulic flow and pressure too, since a powered attachment outside its required range either stalls or runs hot.
Do not assume every rock rake does the same job. Landscape rakes, powered stone windrowers, excavator root rakes, and grapple buckets differ sharply in how they collect material and what they bolt onto. Inspect tines, pins, couplers, hoses, chains, and guards before each use, and keep bystanders clear of spinning rotors, grapple arms, and thrown rock. Skip any claim about maximum rock size, working depth, or required horsepower unless the manufacturer publishes that figure for your exact model.
Sources
- Caterpillar. “Landscape Rakes.” Source for the LR116 working width, tine count, weight, rock-size range, and hydraulic requirements.
- McLaren Industries. “Skid Steer Rock Rake Grapple Bucket – OEM Series.” Source for OEM-Series widths, tine thickness and spacing, cylinder size, fork opening, and the $2,650 starting price.