3
EXPLANATION OF MODEL NUMBER
GH30 B - FF - SPL - 40 000 - 41
GH30
- DESIGNATES GEARMATIC 30 SERIES HOIST FAMILY
B
- EVOLUTIONARY DESIGNATION
FF
- FULL RELEASE FREE FALL EQUIPPED
SPL
- SPECIAL ORDER DESIGNATION
40
- TOTAL GEAR REDUCTION (40:1)
000
- MOTOR CODE, 000 WITHOUT MOTOR, ISO = MOTOR MOUNT & SHAFT TO ISO
SPECIFICATIONS
41
- DRUM OPTION
DESCRIPTION
The primary sun gear is directly coupled to the hydraulic
motor by solid coupler in the static brake assembly. As the
motor turns in the hoisting direction the planetary assem-
blies reduce the input speed of the motor and rotate the
fi nal planet carrier and winch drum.
The Free-Fall assembly contains the fi nal drive planetary
reduction for the winch. The fi nal planet carrier is attached
to the cable drum by splines and the internal ring gear is
mounted on ball bearings. The internal ring gear is kept
from rotating by a multi-disc brake. The brake is applied
by springs that force the piston against the pressure plate
which prevents the ring gear from rotating.
When hydraulic oil is introduced into the annular area
formed between the piston and the freefall housing, the
effective spring load is reduced as the hydraulic pressure
increases. When a load is suspended on the winch cable
and hydraulic pressure is applied to move the piston to the
end of its travel, or the full release position, the internal
ring gear will rotate and allow the load to drop freely to the
ground.
The free fall circuit must be activated by a detent switch.
Release of the freefall brake with use of a metered and
controlled hydraulic signal must be done by means of a
detent type control. Using the freefall brake to stop a load
during lowering once the freefall brake has been pressur-
ized may result in damage to hoist and wire rope.
Free Fall Brake
Release Port
