Caterpillar Performance Handbook, January 2017, SEBD0351-47

Edition 47 5-51

Wood Extraction

Track Skidders

Boom and Grapples

BOOMAND GRAPPLES

The following contains information on some of the avail-

able models, which are presented here to suggest a range

of grapple possibilities.

Reach (A, B)

— The horizontal distance from the ver-

tical center of the rear idler to the vertical center of the

grapple fore and aft pivot.

A) With the grapple in its lowest fully extended position.

B) With the grapple in its highest fully retracted position.

Lift (C, D, E)

— The vertical distance from the ground

to the center of the grapple fore and aft pivot.

C) With the grapple in its highest fully extended position.

D) With the grapple in its highest fully retracted position.

E) With the grapple in its lowest fully extended position.

Maximum Grapple Opening (K)

— The horizontal

distance between the tips of the grapple arms when grap-

ple is fully open.

Area of Opening (L)

— The available area with grap-

ple in tips together position.

Minimum Log Size (M)

— The smallest diameter

which the grapple can close.

Grapple Length (N, O, P)

— The distance from the

grapple fore and aft pivot to tips of grapple arms.

N) With grapple fully open.

O) With grapple in tips together position.

P) With grapple fully closed.

Grapples for 527

2.79 m

(110")

Bunching

2794 mm 0.93 m

76 mm 1780 mm 2020 mm 1360 mm

110"

10 ft

70"

79.5"

53.5"

Bunching Grapple

●

Used for 305 mm (12") or smaller

diameter trees.

●

Designed to gather bundle of stems

and maximize grapple loads.