Manitowoc National Crane NBT50 Series, Руководство оператора

Страница: 79 / 158

NBT50 OPERATOR MANUAL CONTROLS AND OPERATING PROCEDURES
3
National Crane
Published 03-23-2018 Control # 243-14
3-19
• The range diagram (Figure 3-13) shows the operating
radius and the height from horizontal of the unloaded
boom.
• The hoist data chart (Figure 3-14) shows hoist capacity
and multipart line reeving. The correct reeving for all
loads listed in the load chart is also shown.
Before you can determine the crane configuration you need
to know:
• the weight of the load to be lifted.
• the lifting devices needed.
• the height of the lift.
• the horizontal distance from the center of rotation (load
radius) to where the load is to be placed.
To determine the safe operating parameters you need to:
1. Get the weight of the load to be lifted.
2. Approximate the load radius. This is the horizontal
distance from crane center of rotation to where the
payload is to be placed.
3. Determine the lifting devices and hook block reeving
using the hoist data chart.
4. Calculate the combined weight of the lifting devices and
the load to be lifted.
5. Determine the boom angle and length from the range
diagram using the height and load radius of the lift.
6. In the load chart, take the load radius and boom angle/
length column over to the weight column and check the
weight. If the weight is between two values, use the
lower value.
LIFTING THE LOAD
The following general guidelines outline the proper
procedure for making a lift after the crane has been properly
set up.
1. Position the crane in the work area and set the
outriggers. See
Outrigger Setup , page 4-1.
2. Program the RCL. Use the load chart to estimate the
values.
3. Position the boom nose over the load. Do not try and
drag the load with the boom or hoist.
4. Perform the lift. Use light variable movements of the
controls when moving the load to avoid sudden stops.
5. Retract and lower the boom after the lift is complete.
SHUT DOWN AND PREPARATION FOR
ROAD TRAVEL
1. Ensure the swingaway, if so equipped, is properly
stowed and secured or removed from crane.
2. Retract and place the boom in boom rest.
3. Engage the mechanical travel lock at each outrigger
beam.
4. Engage the swing brake.
5. Engage the swing lock.
6. Secure the hook block/headache ball and A2B weight:
• Either the hook block may be reeved over the main
boom nose or the headache ball may be reeved over the
main boom nose or auxiliary boom nose. The other must
be removed and stowed securely before travelling. If the
hook block or headache ball remains reeved on the
boom, it must be secured at the tie down on the carrier
provided for that purpose.
- Slowly hoist up until there is a slight tension on the
hoist cable. It may be necessary to override the A2B
function to tension the cable.
CAUTION
Disengage the hydraulic pumps for extended traveling,
cold weather starting, or engine checks.
Check cold tire pressure prior to extended travel. Refer to
tire inflation decal on crane.
CAUTION
Machine Damage Hazard!
Do not travel with an empty hook in a position where it can
swing freely. Either remove the hook block and/or
headache ball from the hoist cable(s) and stow securely
or make sure the hook block or headache ball is properly
secured to the tie down provided for that purpose.
Fully retract the outrigger jacks and properly store the
floats.
WARNING
Do not travel with swingaway extended to prevent
damage to equipment.
Failure to comply with these instructions may cause death
or serious injury.
!