TM 5-3810-307-24-1-1
HOISTS
DESCRIPTION
One hoist type is available, the Grove HO-15C. The
Each hoist uses a vane motor to drive the reduction
hoist is a single speed unit and is fitted with a 16 inch
unit within the hoists. An overrunning clutch will
(28 cm) drum. The main hoist is mounted on the
allow the hoist to be raised without releasing the
counterweight.
The auxiliary hoist is mounted
brake while holding the load until there is sufficient
forward of the main hoist.
pressure to release the brake when hoisting down.
THEORY OF OPERATION
The first section of the hydraulic pump supplies oil
When the remote control lever is placed in a working
through swivel port 12 to the hoist directional control
position, it sends a pilot pressure signal to shift the
valve. Movement of the directional control valve
valve spool in the directional control valve, thus
spool is controlled by pilot pressure signals received
routing pressure and flow to drive the hoist.
from the remote control levers in the cab.
MAINTENANCE
NOTE
For more detailed information refer to the applicable SM package.
MAIN AND AUXILIARY HOIST ASSEMBLIES
Removal
NOTE
Main and auxiliary hoists are interchangeable. Procedures below can be
applied to either hoist unless otherwise noted.
a.
Disconnect hoist cable from hook block, and remove cable from hoist by unwinding cable from hoist drum
onto a spare cable reel.
b.
Ensure battery disconnect switch is in the OFF position.
c.
Remove rotation indicator controller unit with mounting bracket, refer to MAIN AND AUXILIARY HOIST
ROTATION INDICATOR CONTROLLER UNIT Removal procedures.
d.
Tag, disconnect, and cap three hydraulic lines from hoist.
e.
Remove nuts (1, Figure 2-11-1) and washers (2) securing hoist to turntable counterweight.
f.
Attach suitable lifting device to hoist (4) and lift hoist from turntable counterweight.
