Manitowoc National Crane 800D, Operator'S And Service Manual

Page: 141 / 256

National Crane
Published 5-27-2018 Control # 039-06 5-35
800D SERVICE
22. Install a jumper across the terminals of one of the
connectors and check for continuity at the opposite
connector. If the new wire does not have continuity,
check the terminals to ensure they have been attached
correctly.
23. Do not proceed until this wire shows continuity.
24. Visually inspect interior routing of anti-two-block wire for
excess slack in wire, inaccurate routing of wire, etc.
Correct any problems before boom operation.
25. Make all wire connections, reattach the wire to the
cushion clamp on the bottom of the boom and check
system for correct operation.
26. Slowly cycle the boom while checking for proper wire
operation.
2/3/4 STAGE ANTI-TWO BLOCK WIRE
REPLACEMENT
The procedure for removal and reinstallation of the 2/3/4
stage anti-two-block wire can be accomplished using two
different methods depending on the severity of the damage.
Alternative No. 1 should be used if the wire has experienced
a continuity failure in the conductors but the rubber jacket of
the wire is still intact. Alternative No. 2 is to be used if the wire
has been completely cut or either end of the wire is not
accessible.
Do not, under any circumstances, work at an elevated
height without using proper fall protection as required
by local, state or federal regulations.
Alternative No. 1
This procedure pulls the replacement wire through the boom
following the path of the defective wire.
Special tools or equipment:
•Two end-to-end butt connectors
•Shrink tube or electrical tape
1. Retract boom completely.
2. Loosen and remove capscrew and cable clamp from
sheave case attachment point. Remove connector from
wire, measure and record pigtail length from attachment
point, and pull end of wire through the side plates of the
boom to align the end with the wire routing over the
telescope cylinder.
3. Attach replacement anti-two-block wire to the damaged
wire using the end-to-end butt connectors and tape or
shrink tube. This connection must be secured well
enough to pull the new wire through the boom.
4. At the hoist mount end of the boom, reach into the rear
of the boom and loosen the capscrew on the anti-two-
block cable clamp enough to let the cable run around it
with minimal effort. This clamp is located on the extend
cable anchor at the back bottom of the fourth section.
5. Disassemble capscrew attaching cord grip/spring/anti-
two-block wire to the extend cable anchor on the 2nd
boom section at the hoist mount end of the boom.
6. Slowly pull the damaged wire from the hoist mount end
of the boom. The splice on the end of the replacement
wire may need help moving around the cable clamp at
BOOM EXTENDED
PROPORTIONING CABLE
TRAVELING BLOCK
BOOM RETRACTED
11.5 in
(29 cm)
2ND SECTION BOOM
TOP PLATE
1/2 WIRE ROUTING
9390
Fo
r
Reference
Only