National Crane
Published 5-27-2018 Control # 039-06
5-37
800D
SERVICE
15. The routing of the new wire is now complete and the tool
can be detached from the wire. Visually inspect the wire
routing to make sure that it is correctly routed.
16. Pull the wire from either the sheave case or hoist end of
the boom to get the end lengths closer to what is
required.
17. Tighten the clamp at the bottom back of the fourth
section.
18. Reassemble the clamp at the sheave case and while
applying 15-25 lb (7-11 kg) of tension to the new wire,
tighten the clamp. Measure the length of pigtail required
and reassemble the connector onto the wire. Route the
connector through the sheave case and make the
connection with the anti-two-block switch. The
connectors on this cable are two separate styles. Make
sure the Weather-Pack connector is on the end that will
attach to the 1/2 wire.
19. At the hoist end of the boom, install the cord grip and
spring onto the new wire at the approximate final
position inside of the boom. Install the capscrew into the
spring and cable anchor. While applying tension to the
wire, slide the cord grip out the wire until there is
approximately 2 in (50 mm) of spring extension for
proper operation.
20. Attach connector to wire. The connectors on this cable
are two separate styles. Make sure the Weather-Pack
connector is on the end that will attach to the 1/2 wire.
21. Visually inspect routing and anchors for correct
assembly, excessive slack and/or capscrew torque, etc.
Verify continuity of new anti-two-block wire.
REPLACEMENT OF PROPORTIONING
CABLE FOR 1/2 STAGE OF ANTI-TWO
BLOCK WIRE
Operation
The 1/2 stage of the anti-two-block wire is driven by a small
diameter steel proportioning cable. This cable drives the
traveling block, which carries the live wire of the system. The
location of the traveling block at full extension and retraction
is critical to the proper operation of this system. If the
traveling block is not located correctly, it could either fall off of
the back of the second section during boom extension or be
pinched between the first and second section top plates by
the reinforcing plate on the second sector during boom
retraction.
Maintenance
The wire can be replaced with the boom assembled. If the
wire has separated and become lodged in the boom extend
and/or retract sheaves, boom disassembly will probably be
required. There are two alternatives to the steel cables'
replacement. Alternative will deal with an intact cable and
alternative No. 2 will deal with a cable that has been cut into
two pieces. The replacement cable supplied through
National Crane part department works for several different
lengths of booms. It will have to be installed and cut to the
correct length during assembly.
CENTER SHEAVE ON
TELESCOPE CYLINDER
ANCHOR AT TOP BACK
OF SECOND SECTION
ANTI TWO BLOCK
SWITCH
CLAMP AT SHEAVE CASE
WEATHER-
PACK
2/3/4 WIRE ROUTING
ANCHOR AT BOTTOM BACK
OF FOURTH SECTION
9391
Fo
r
Reference
Only
Содержание National Crane 800D
Страница 1: ...Operator and Service Manual National Crane 800D F o r R e f e r e n c e O n l y ...
Страница 4: ...F o r R e f e r e n c e O n l y ...
Страница 98: ...MAINTENANCE 800D 3 10 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 194: ...SPECIFICATIONS 800D 8 4 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 216: ...INSTALLATION 800D 9 22 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 232: ...CRANE INSTALLATION 800D 10 16 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 252: ...SCHEMATICS 800D 2 Published 5 27 2018 Control 039 06 F o r R e f e r e n c e O n l y ...
Страница 255: ...F o r R e f e r e n c e O n l y ...
Страница 256: ...F o r R e f e r e n c e O n l y ...