SHEAVES
The sheave assembly (fig. 4-48) is a type of pulley
used to guide and change direction of the drive system
cables. Sheaves are located on the traverse carriage to
feed the cable on and off the drum when the retraction
engine is in motion. Fixed sheaves on the retraction
engine guide the cables to the fairlead sheaves. The
fairlead sheaves are those sheaves that lead the drive
system from the retraction engine to the forward and aft
ends of the catapult trough.
CABLES
The drive system cables are 9/16-inch wire rope
with a swage type fitting on one end for attachment to
the grab. Two advance cables and two retract cables
attach to the forward and aft end of the grab. The cables
are then fairleaded to the retraction engine, around the
traverse carriage sheaves and then a predetermined
length is wound onto the drum. The drum ends of the
cables are held in place by bolted clamps. During
retraction engine operation, as the drum rotates, one
4-40
CABLE-TENSIONER
SHEAVE ASSEMBLY
(OUTBOARD SIDE)
LEAD SHEAVE
ASSEMBLY
CABLE-TENSIONER
SHEAVE ASSEMBLY
(INBOARD SIDE)
TRAVERSE-CARRIAGE
SHEAVE AND
ADAPTER ASSEMBLY
CABLE-TENSIONER
CLEVIS ASSEMBLY
ABEf0449
Figure 4-48.—Sheaves.
