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A skidding grapple is your best choice of machine if you work on flat terrain which is dry, and you have a large tractor with sufficient front-end weights. For front end weight requirements, click here. Skidding grapples work best in clear-cuts. If you are working in hilly, wet, or slippery terrain, or if you want to reduce damage to the stand by selective cutting, there is equipment that will work better than a skidding grapple. Click here to read about the Farmi Tree Harvesting Method.
Valby Tractor Grapple Model SGR 76 and SGR76-ML
Click here for more information on the SGR76-ML grapple. This model uses a mechanical lock, rather than a hydraulic side-shift.
The Valby SGR76 Grapple converts your farm tractor into a productive forest machine. It can be used three ways:
The skidding grapple is your best choice machine if you work on flat terrain, which is dry, and you have a large tractor with sufficient front end weights. The ruggedness of the grapple enables multiple tree length stems to be skidded out at one time.
Transport of Small Stems:
Small stems, stacks of pulp wood, brush, and slabs can be lifted clear off the ground. This keeps the material clean, and transfers the weight of the material to the rear tires, for added traction.
The side-shift function enables easy placement of the material in stacks. The hight of the stacks depends on the tractor, but four to five foot stacking heights are typical.
The Valby SGR76 can be side-shifted 30 degrees to either side, as shown in the photo below. Side shifting allows the operator to grab loads from the side, without spending time maneuvering the tractor. The side shifting also allows for controlled stacking of pulpwood and similar materials.
Mechanical Frame Lock
If your tractor does not have two sets of remote outlets, or a floating position, you can choose the SGR76-ML model, which requires only one set of hydraulic outlets.
This version does not have a side shift cylinder, but has a frame lock that locks the grapple in place when needed. When the frame is in a floating position, it provides a hinge point and enables the tractor to make turns. The frame lock is rope controlled from the tractor cab.
The grapple is designed to endure years of professional use. The materials used are thick, and the jaws are boxed for added strength.
Both cylinders of the grapple are welded design, and have an inside diameter of over 3". That provides strong holding pressure for the jaws that hold onto the logs. The cylinders can take pressure of up to 2900 PSI. The piston is also overdimentioned, and has a diameter of almost two inches. Click here for a close up of the cylinder.
Every joint has a grease fitting, and the unit weighs 680lbs. The head-board plate can be used to bunch the logs into piles suitable for transport by the tractor grapple. The jaws are made to withstand hard use, and the pins have large diameters.
The grapple mounts on the three point hitch of any category II tractor between 50 and 100 HP. The tractor must be equipped with a full set of front end weights. The grapple has a parking stand, which enables easy hook up and removal of the machine.
The grapple needs two pairs of hydraulic outlets off the tractor. One pair opens and closes the grapple. The other pair works the side shift. If the hydraulic side shift is not important to you, or if your tractor does not have a second hydraulic circuit, you can still choose a Valby grapple by selecting a version that has a mechanical lock of the frame instead of the cylinder. This model is listed above as the SGR76-ML
If the grapple is used for skidding, when the ends of the stems drag on the ground, then one will benefit from having a floating position on the valve that operates the side-shift. Your dealer can retrofit older tractors with a valve that has a float position.
The grapple opens to 76 inches and has a side-shift feature. The hydraulic side-shift enables the operator to grab a load from the side without spending time to maneuver the tractor. The side-shift also helps the operator to stack the logs in piles at the landing. The head-board plate can be used to bunch the logs into piles suitable for transport by the tractor grapple. The jaws have a bypass design, which is an improvement over clamp grapples. The jaws are made to withstand hard use, and the pins have large diameters. Every joint on the SGR76 has a grease fitting. The grapple cylinder and the side-shift cylinder are of welded design and built for up to 2900 psi of pressure. The grapple cylinder and the side shift cylinder are double-acting and thus require two sets of hydraulic outlets from the tractor. One set is to open and close the grapple, the other set is to turn the frame. It would be advantageous if the tractor has a floating position on the circuit which runs the side shift. The tractor must be equipped with front end weights.
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Fax: (607) 589-4026. Mail: 460 Halsey Valley Road, Spencer N.Y. 14883.