National Crane Published 4-23-2018 Control # 239-11 4-7
NBT40 SERIES OPERATOR MANUAL SET-UP
INSTALLING CABLE ON THE HOIST
NOTE: The cable should preferably be straightened before
installation on the hoist drum.
Install cable on the hoist drum in accordance with the
following procedure.
3. Position the cable over the boom nose sheave and route
to the hoist drum.
4. Position the hoist drum with the cable anchor slot on top.
5. Insert the cable through the slot and position around the
anchor wedge (1) Figure 4-4.
NOTE: The end of the cable should be even with the
bottom of the slot for the anchor wedge.
6. Position the anchor wedge in the drum slot; pull firmly on
the free end (2) of the cable to secure the wedge.
NOTE: If the wedge does not seat securely in the slot,
carefully tap (3) the top of the wedge with a mallet.
7. Slowly rotate the drum, ensuring the first layer of cable is
evenly wound onto the drum.
8. Install the remainder of the cable, as applicable.
9. Attach the wedge socket to the free end of the cable as
shown in (Figure 4-6). If you are using a terminator
wedge socket, see Figure 4-5.
10. Torque the clamp on the dead end of the cable to 95 ft-lb
(128 Nm).
NOTE: The torque must be rechecked after the initial
operation of the crane. Be sure cable the clamp is
attached to the dead end of the cable only.
11. Start winding the cable onto the hoist drum. Maintain
about 500 pounds (250 kg) of tension on the cable.
12. Keep the cable wraps tight against each other when the
first half of the bare hoist is filling. The second half of the
hoist should wrap tightly because the fleet angle of the
cable tends to pull the cable to the center of the drum
thus wrapping tightly.
13. Continue winding the cable on the second, third and
fourth layer of the hoist. Keep the cable paying in
straight to the boom to avoid side loading the boom. The
preceding layers will wrap smoothly guided by the first
layer wrapping.
WEDGE SOCKETS
To install a wedge socket:
• Make sure the wedge socket is the proper size for the
cable.
• Do not mix components of different wedge socket
manufacturers.
• The wedge socket must meet the requirements of the
wedge socket and wire rope manufacturers.
State and local laws may vary and require different
attachment methods depending upon work conditions. The
user is responsible for alternate attachment methods.
Terminator Wedge Installation
The NBT40 SERIES is shipped with a terminator wedge
socket which is National Crane’s preferred type of socket
(Figure 4-5). Other wedge socket types are shown on
page 4-8.
To attach a terminator wedge Figure 4-5, use the following
procedure:
1. Match the socket, wedge, and clip to the wire rope and
size the rope with the go and no go hole in the socket.
• The wire rope must pass through the “go” hole and
not pass through the “no go” hole.
CAUTION
If cable is wound from the storage drum, the reel should
be rotated in the same direction as the hoist.
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