National Crane Published 5-27-2018 Control # 039-06 2-17
800D OPERATION
HOIST SYSTEM OPERATION
The hoist is mounted at the rear of the first section boom. It
has capacities totally independent of the rest of the crane
and can normally pull more than the crane itself can
withstand. Therefore, care must be taken to insure that the
load being lifted is within boom rating. To lift some of the
heavier loads on the capacity chart, it will be necessary to
multiple part reeve the hoist block to increase the lifting
capacity of the hoist (the speed is proportionately slower)
and remain in the strength limitations of the hoist and wire
rope.
USING MULTIPLE PART LINES
The hoist load rating chart on each machine provides the
information for pull limitations on the hoist with various
applicable part reevings. These ratings are based on
providing the proper operating safety factor on the wire rope
supplied with the machine. Therefore, any replacement rope
must meet the rope specification sections of this manual.
GENERAL RULES WHEN OPERATING
HOIST
1. Always operate the hoist control to payout the loadline
while extending the boom. This will maintain clearance
between the boom tip and loadline hook.
2. Do not rely on anti-two-block system to eliminate two
blocking. Use the system as a backup to safe operation.
3. Make certain the hoist cable is not twisted or kinked and
that cable is properly seated on the drum and in the
sheaves.
4. Before lifting a load, always make certain that three full
wraps of rope will remain on the drum at all times
throughout the lift.
5. When lifting a load approaching the rated hoist load,
raise the load a few inches and return the control to
neutral to determine if the brake is working properly.
6. Do not drag loads in any direction with the hoist.
7. Never attempt to lift loads which are not loose and free,
i.e. frozen down material or poles out of ground.
8. Maintain tension on the loadline at all times to prevent
the cable from becoming twisted or kinked or improperly
seated on the hoist drum or sheaves.
LIFTING THE LOAD
After the vehicle and crane have been properly set up and it
has been determined the load to be lifted is within the ratings
of the crane and hoist reeving system, again check the work
area for electric power lines and other obstructions so that
proper clearances can be maintained. (See Safety Rules.) If
load is not visible to operator throughout lift, a person must
be appointed to use hand signals as shown on the last page
of this section. Proceed with lifting the load.
1. Rotate, extend or move up or down until boom tip is
directly over the load.
2. The crane is normally equipped with a rotation stop. It is
important that you be aware of the position of the stop
before lifting in order to assure maximum rotation and
prevent excessive handling of the load.
3. During operations, the controls should always be
metered when beginning or terminating movement to
prevent sudden starting or stopping, which imposes
undue shock loads on the equipment. This is especially
true when handling heavy loads. The control should be
slightly actuated to begin movement and then slowly
increased to desired operating speed. The results
obtained from metering the oil flow with the control lever
1 PART LINE
2 PART LINE
3 PART LINE
4 PART LINE 5 PART LINE
6 PART LINE
MAX. PULL
7700 lb
(3492 kg)
MAX. PULL
15,400 lb
(6985 kg)
MAX. PULL
23,100 lb
(10 477 kg)
MAX. PULL
30,800 lb
(13 970 kg)
MAX. PULL
38,500 lb
(17 463 kg)
MAX. PULL
46,000 lb
(20 866 kg)
9352
9359
9360
9361
9362 9363
Fo
r
Reference
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