A large industrial machine, resembling a rock crusher or soil screener, against a background split into a yellow and a black-and-white side, with a cloudy sky and a rural landscape.

OS7 STONE SLINGER

Introducing the Self-propelled OS7 by WK Dahms - a game-changer in the realm of large-scale construction projects. Designed to deliver unparalleled efficiency and productivity, the OS7 empowers operators to achieve non-stop, remote-operated material placement of up to 400 tons per shift. With seamless integration into your workflow, this cutting-edge machine redefines the way materials are distributed on-site.

Featuring a high-speed conveyor system with its own hydrostatic, four-wheel drive platform the OS7 ensures precise positioning and smooth operation, allowing for swift and accurate material placement. By enabling operators to feed the hopper directly from on-site stockpiles using available loaders, the OS7 eliminates downtime and optimizes workflow, ensuring a continuous supply of materials for uninterrupted progress.

PRODUCT FEATURES

Aerial view of a large industrial machine, possibly a grain or crop harvester, on a grassy field. The machine is painted white with orange and gray accents, featuring a long conveyor belt or chute at the center.

“LIVE BOTTOM” APRON FEED CONVEYOR

The live bottom conveyor eliminates gates, beams and the issues associated with them. Powered by a robust planetary drive, the live bottom system off-loads smoothly to the conveyor belt.

Close-up of a conveyor system labeled 'Super-Shield' on a cloudy day, with a flat, open outdoor area in the background.

HIGH PERFORMANCE PLACING CONVEYOR

The OS7 utilizes high performance hydraulics on the placing conveyor to reach throw distances of 120 ft. 250º working pivot radius and an increased angulation of 23º above and below horizontal, operators have complete control for precise placement.

Construction site with heavy machinery, including a skid-steer loader dumping dirt onto a hillside and a conveyor belt for soil removal, with a concrete wall to the side and mountains in the background.

ALL TERRAIN MOBILITY

Hydraulic hopper levelling keeps the machine stable on uneven terrain. Rugged, high flotation tires and high torque drive systems tackle the toughest jobsites with ease.

Person holding a DJI drone controller with two hands, adjusting controls, against a concrete wall background.

REMOTE OPERATION

Wireless remote control of all Stone Slinger functions including hydrostat drive and individual axle steering control to navigate tight jobsites. Also includes remote engine start and stop.

Construction site with a front loader depositing dirt into a dump truck.

HOPPER WING EXTENSIONS

Individually operated, hopper wing extensions allow for loading via large bucket loaders. This reduces material spillage and waste. Wings can be left in the lowered position which allows for easy side loading.

HOPPER CAPACITY

7 cu/yd

SPECIFICATIONS

BASIC BODY DIMENSION

Body (LxWxH): 260” x 102”’ x 108”
Loading Height: 74”
Net Weight: 18,600 lbs (8437 kg)

DRIVE SYSTEM

CAT C4.4TA (Tier 4F) 131 HP, fuel efficient self-contained diesel power with direct coupled hydraulic pumps
Engine and system control via Sauer Danfoss CANBUS
Danfoss closed loop piston pumps and motors on drive system
Danfoss variable displacement pumps and load sense valves on Stone Slinger functions
Planetary gearbox with direct coupled hydraulic motor on swing frame for conveyor rotation
4 steering modes controlled via transmitter ~ front, rear, articulated & crab

CONVEYOR PLACEMENT SYSTEM

32” apron chain centers, 26” wide live-bottom unloading system
19’ throw conveyor c/w W.K. Dahms ½” high cleat belt

STANDARD FEATURES

Super-Shield™ Power Drive matches conveyor speed for improved control
Double pivot swing frame with 250° degree working pivot radius
Low overall profile to access indoor work sites
Hopper wing extensions reduce material spillage and waste; feed with larger loaders and excavators

Download Spec Sheet