General Machine Products 70202 Universal Swivel Sheave 25000 lb - Manual (Page 4)

4
The sheave assembly is normally mounted on the body
deck at the most rearward position of the tail shelf. The
center-line of the sheave, truck body and winch drum
should all be consistent with the centerline of the chassis
frame.
Place the sheave assembly on the tail shelf as described
above. Note the four mounting holes— two major holes
in the horizontal plane and two minor holes in the verti-
cal plane. Using the mounting holes as a template, drill
two 1 3/8 in. diameter holes in the horizontal section and
two 15/16 in. diameter holes in the vertical section.
Two zinc alloy mounting sockets (P/N
15836 - two required) are supplemental
to the sheave assembly itself. Using the
two drilled holes in the diamond plate as
a location guide, bolt the two sockets to
a sufficiently strong section of the body
to withstand the maximum allowable
load of the sheave. The top surface of
the sockets should be mounted so that
they are ultimately snug against the un-
derside of the diamond plate.
Place the sheave assembly on the tail shelf. Screw the
two 1 1/4 in.-7 x 4 in. long, Grade Eight bolts (P/N
17746) into their mounting sockets. Place the two
7/8 in. -9 x 2 in. long Grade Five bolts (P/N 17729) into
the holes in the vertical section of the tail shelf with the
heads outboard. Attach the nuts and tighten snugly. Tack
weld both nuts in place. Recheck all four bolts according
to the following torque values:
1 1/4 in. diameter bolt
@ 190 foot pounds (257 Nm)
7/8 in. diameter bolt
@ 85 foot pounds (115 Nm)
For additional details refer to drawings on
pages 6 and 7.
Installation