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REPAIR
800D
6-10
Published 5-27-2018 Control # 039-06
Front Bottom Pad Replacement
1. Extend boom approximately 4 feet (120 cm) out.
2. Using an appropriate lifting device, sling around the 3rd
section boom and lift it up until weight is removed from
the bottom pads in the front of the 2nd and 1st boom
sections.
3. Loosen and remove the six capscrews holding the pad
doubler plate in between the 3rd and 2nd sections,
remove plate, remove pads from this plate. Note all pad
locations and tag accordingly.
4. Loosen and remove the four capscrews holding the
bottom front wear pads to the 1st section, remove pads.
Retract cable adjustment ends may have to be loosened
during this step. Note all pad locations and tag
accordingly.
5. Replace all wear pads, wear pad plate and retorque
retract cables if disassembly of cables was required.
FOUR SECTION BOOM OPERATION
The boom service and maintenance section of this
manual includes both the three and four section boom
information. Use appropriate information for your particular
boom length.
A rod-fed, two-stage double-acting cylinder, attached to the
1st, 2nd and 3rd boom sections, supports and propels the
2nd and 3rd boom sections. The extend cables attach to the
base end of the 2nd boom section, are reeved around
sheaves attached to the cylinder, and attach to the base end
of the 4th boom section, therefore providing support and
extension of the 4th boom section. The 3rd section retract
cables attach to the tip end of the 1st boom section, are
reeved around sheaves attached to the 2nd boom section,
and attach to the base end of the 3rd boom section, therefore
providing retraction of the 3rd boom section. The 4th section
retract cables attach to the tip end of the 2nd boom section,
are reeved around sheaves attached to the 3rd boom
section, and attach to the base end of the 4th boom section,
therefore providing retraction of the 4th boom section. A
proportioning cable attached to the rear of the 1st section,
reeved around a sheave at the tip of the 2nd section, and
anchored to the rear of the 3rd section maintain proper
cylinder extension proportion, therefore maintaining equal
boom section proportion Detailed service and maintenance
is required to insure smooth and proper operation.
FOUR SECTION BOOM MAINTENANCE
Do not, under any circumstances, work at an elevated
height without using proper fall protection as required
by local, state or federal regulations
Internal Cable Sheave Lubrication
Special Tools:
Nozzle or needle grease gun fitting. The
lubrication points on the sheaves are not equipped with
grease fittings (zerks), therefore a 0.25 in (6.35 mm)
diameter nozzle grease gun tip will be required. Contact the
National Crane Product Support Department to obtain this
nozzle tip (NCC Part No. 955047), or numerous variations of
the nozzle tip can be purchased at local hardware or auto
parts retail outlets.
NOTE: Observation through the sheave case for the
extend sheaves and the hoist mount for retract sheaves
will visually determine the amount of grease necessary
for proper lubrication. A slight amount of grease
extrusion around the pin joint is adequate for proper
lubrication.
Lubrication of the extend cable sheaves located on the boom
tip end of the telescope cylinder, and the retract cable
sheaves located on the inside rear of the 2nd and 3rd section
BASE
2/3/4 EXTEND
TIP
1ST STAGE
2ND STAGE
3RD STAGE
3/2/1 RETRACT
1/2/3 EXTEND
4/3/2 RETRACT
4TH STAGE
9401
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 ...