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 Bypass
Tractor Grapple
The modern
bypass grapple is an improvement over the clamp
grapples. The Valby Tractor Grapples is unique in
that the jaws bypass each other. The form of the
bypass grapple provides for easy roll in of the
logs. The logs are then held firmly in place
because the load is supported from all directs by
the bypass jaws |
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Skidding
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.
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Transport of Small
Stems:
The Valby tractor grapple has a heal bar so 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 .
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The Valby SGR 76 has a hydraulic side shift,
which enables it to be used for stacking. |
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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 hinge lock is engaged. |
The hinge lock is open. |
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The SGR76-ML version of
the Valby tractor grapple attachment has a
mechanical hinge lock which locks the frame in place
when the grapple is transported without a load. This
version enables the operator to lock the hinge in
place from the tractor's seat. The rope controlled
hinge lock should be put into the locked position
when one is driving out with an empty grapple. If
the lock is not engaged, the grapple will flop back
and forth, side to side. The hinge lock enables the
operator to place the grapple on top of a load and
grab it. If the load is lifted entirely off of the
ground, one can leave the lock in the lock position.
If one is skidding out longer trees, where the tree
is dragging on the ground, then one has to release
the hinge lock. The load can now follow the tractor
through turns. |
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 Durable
DesignThe
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.
Every joint
has a grease fitting, and the unit
weighs 790lbs. 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. |
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The jaws are made of heavy material. They are of a
box design, and there is a grease fitting at every
joint. |
The pins have a very large diameter, which increases
their durability. The pins are also able to be
greased |
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Mounting
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.
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.
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. |
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Technical Information |
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SGR76-ML |
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Weight |
740 lb. |
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Max.
Grapple Opening |
76" |
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Cylinder Inside
Diameter |
3" |
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Cylinder Piston
Diameter |
1 15/16" |
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Max. Working Pressure |
2900 psi |
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Mounting |
Cat II tractors, 50 to 100 HP |
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The forward hinge point of the
SGR76-ML tractor grapple enables the operator to
make sharp turns with the tractor. |
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Phone:
1-866-638-7885 
