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National Crane
Published 5-27-2018 Control # 039-06
6-9
800D
REPAIR
21. As the telescope cylinder keeper plate nears the 2nd
section, adjust the height of the cylinder to allow the
cylinder to access the cylinder keeper cutouts in the
doubler plates on the sides of the 2nd section.
22. Drop the cylinder down into the vertical cutouts in the
doubler plates on the sides of the 2nd section.
23. Install lock bar and capscrews to the telescope cylinder.
24. Position 2nd/3rd cylinder assembly in position to be
inserted into 1st section. Lay retract cables out under
2nd/3rd cylinder to allow easy installation as the booms
are assembled.
25. Slide 2nd/3rd cylinder assembly into 1st section boom
approx. 2 ft (60 cm). Use caution during this step to keep
retract cables straight and on the correct side of the
boom assembly as the sections are assembled.
26. Continue to slide 2nd/3rd cylinder assembly into 1st until
it is approximately halfway into 1st.
27. Assemble bottom front wear pads in 1st section,
trapping ends of retract cables in slots on bottom of 1st
section. Lift 2nd/3rd cylinder assembly up to ease
installation.
28. Slide boom together to within 12 in (30 cm) of complete
retraction. Install upper front spacer bar in 1st section
and upper front wear bar and cable guide assembly to
2nd.
29. Retract boom completely, using proper hardware and
spacers, connect telescope cylinder butt plate to the
hoist mount. Hydraulic power source can be utilized at
this time if slight cylinder length adjustment is necessary.
30. Slide extend cable anchor into position in hoist mount.
Push threaded ends of 5/8 in (15.88 mm) extend cables
through holes in anchor and assemble hex nuts onto
threaded ends.
31. Assemble top rear wear pads and plates to the top of the
2nd and 3rd boom sections. These assemblies can be
inserted from the hoist mount end of the boom. The cam
plates have an eccentric hole which allows the wear
pads to be positioned at different widths. Install the cam
plates in the wear pads so that the wear pads are tight
against the boom side plates. These plates function as
rear side clearance adjustment.
32. Approximately 10 ft (300 cm) of anti-two-block cable will
be available on the hoist mount end of the boom to route
and hookup to the control console wiring. Find the end of
this cable and slide the cord grip/strain relief hookup
onto it and slide it up the cable into approximate position
inside the boom.
33. Assemble the extension spring and spade bolt to the
cord grip. Assemble the spade bolt through the
telescope cylinder anchor with a hex nut. Adjust tension
on anti-two-block cable by sliding cord grip down cable
into the boom. Approximately 2 in (5 cm) of spring
extension should be adequate for proper boom
operation.
34. Visually check each end of boom for proper extend,
retract and anti-two-block cable routing and placement.
Make certain anti-two-block cable is correctly on
sheave. Inspect from sheave case end.
35. Adjust slack out of extend and retract cables at hex nut
adjustment points. Slowly cycle boom in and out several
times. Torque cables per procedure located elsewhere
in this book.
THREE SECTION TOP/BOTTOM PAD
REPLACEMENT ASSEMBLED BOOM
Inspect top and bottom wear pads periodically for signs
of abrasion or excessive wear. Excessive is defined as 3/16
of an inch (4.76 mm) from the original pad thickness. Top
rear pad thickness 0.75 in (19 mm), bottom front 1st section
1 in (25 mm), bottom front 2nd section 0.50 in (13 mm).
Uneven pad wear of 3/32 in (2 mm) from side to side on the
wear pad would be considered excessive as well. If any of
these conditions exist, the top and bottom pads can be
replaced without complete disassembly of the boom.
Top Rear Pad Replacement
1. Retract boom completely.
2. Remove capscrews through access holes on top rear of
sections.
3. Remove wear pads and cam plates from the rear of the
boom through open hoist mount end.
4. Note all pad locations and tag accordingly.
5. Inspect pads for wear using previously mentioned
inspection criteria.
6. Assemble new wear pads with the cam plates and install
through the hoist mount end of the boom. Install
capscrews through holes in outer boom sections.
7. The wear pad on each side at the top/rear of the boom
can be adjusted over a range of 3/16 in (4.8 mm) by
rotating, end for end, the wear pad and plate or the wear
pads and plates independently. This is possible because
the holes in these parts are offset from the center. The
holes are 0.06 in (1.5 mm) off center in the plate and
0.03 in (0.8 mm) off center in the wear pad. Various
combinations of rotation of these parts allow the
adjustment.
8. Adjust pads until they are within 0.03 in (0.8 mm) or less
of the side plates of the outer boom section.
9. Torque retainer capscrews to 110 lb-ft (149 Nm) Failure
to properly torque capscrews will cause loss of preload
and cause excessive side clearance between sections.
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 ...