Manitowoc National Crane 800D, Руководство оператора и по обслуживанию

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SERVICE 800D
5-40
Published 5-27-2018 Control # 039-06
ANTI-TWO-BLOCK INTERNAL WIRE
SYSTEM/THREE SECTION BOOM
Operation
The internal anti-two-block wire is routed from the
control console to the hoist mount end of the boom, following
the path of the extend cables to the rear of the 3rd section
boom. This is the length of the wire that proportions in and
out with the boom length, similar to the route of the extend
cables. At this point at the rear of the 3rd section, the wire
loops around and anchors at the anti-two-block cable clamp
on the extend cable anchor. The anti-two-block wire, now
attached at the rear of the 3rd, runs the length of the section
and attaches to the 3rd section sheave case. The wire then
loops around the clamp arrangement on the sheave case
and routes through access holes in the side plate of the
boom. The wire terminates at a quick connect two conductor
plug designed for anti-two-block switch or jib interface.
Maintenance
In the event of a break in continuity of the anti-two-block wire
routed internally in the boom, the anti-two-block hydraulic
system will sense a problem and make certain crane
functions inoperative. Before repair or replacement of
internal wire, check for continuity loss at the anti-two-block
switch, damaged, missing, or corroded connectors and
overall system condition. Due to the environmental exposure
of the system, a thorough check of the circuit should be
performed.
The procedure for removal and reinstallation of the 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 one or both of 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
inaccessible.
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 electrical butt connectors
•Shrink tube or electrical tape
1. Retract boom completely.
2. Loosen and remove capscrew and cable clamp
arrangement from sheave case attachment point of anti-
two-block wire. Remove quick connect plug on anti-two-
block wire by unscrewing base of plug and
disconnecting individual wires from connections. Note
pigtail length at this time and wire/terminal number
location for proper reassembly.
3. Pull end of anti-two-block wire through side plates of 3rd
section boom to gain in-line wire path.
4. Attach replacement anti-two-block wire to damaged wire
with a “temporary splice”, securing the conductors with
end to end butt connectors and shrink tube or electrical
tape. This connection must be secured well enough to
pull the new wire through the boom.
BOOM EXTENDED
PROPORTIONING CABLE
TRAVELING BLOCK
BOOM RETRACTED
11.5 in
(29 cm)
2ND SECTION BOOM
TOP PLATE
1/2 WIRE ROUTING
9393
Fo
r
Reference
Only