National Crane 600H, Руководство по обслуживанию

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NATIONAL CRANE
08-19-2022 Control # 092-13
4-7
600H SERVICE MANUAL BOOM
4
21. As the extend cylinder keeper plate nears the 2
nd
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 2
nd
section.
22. Drop the cylinder down into the vertical cutouts in the
doubler plates on the sides of the 2
nd
section.
23. Install lock bar and capscrews to the extend cylinder.
24. Position 2
nd
/3
rd
/ cylinder assembly in position to be
inserted into 1
st
section. Lay retract cables out under
2
nd
/3
rd
/ cylinder to allow easy installation as the booms
are assembled.
25. Slide 2
nd
/3
rd
/ cylinder assembly into 1
st
section boom
approximately 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 2
nd
/3
rd
/ cylinder assembly into 1
st
until
it is approximately halfway into 1
st
.
27. Assemble bottom front wear pads in 1
st
section, trapping
ends of retract cables in slots on bottom of 1
st
section.
Lift 2
nd
/3
rd
/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 1
st
section
and upper front wear bar and cable guide assembly to
2
nd.
29. Retract boom completely, using proper hardware and
spacers, connect extend 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 to the top of the 2
nd
and
3
rd
boom sections with the cam plates. Wear pads can
be inserted from the hoist mount end of the boom. Install
capscrews through holes in outer boom sections.
32. 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 plate 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.
a. Adjust pads until they are within 0.03” (0.8mm) off
center in the wear pad. Various combinations of
rotation of these parts allows the adjustment.
b. Torque retainer capscrews, refer to Fasteners and
Torque Values pg 1-7. Failure to properly torque
capscrews will cause loss of preload and cause
excessive side clearance between sections.
33. 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.
34. Assemble the extension spring and spade bolt to the
cord grip. Assemble the spade bolt through the extend
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.
35. 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.
36. 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)
NOTE: Refer to Inner Wear Pad Calibration pg 4-8 of this
section to determine Wear Pad shim thickness.
Inspect top and bottom wear pads periodically for signs of
abrasion or excessive wear. Excessive is defined as:
- 3/16 of an in (4.76 mm) from the original pad
thickness.
- Top rear pad thickness 0.75 in (19.05 mm).
- Bottom front 1
st
section 1 in (25.4 mm).
- Bottom front 2
nd
section 0.50 in (12.7 mm).
- Uneven pad wear of 3/32 in (2.38 mm) from side to
side on the wear pad.
If any of these conditions exist, the top and bottom pads can
be replaced without complete disassembly of the boom.
Top Rear Pad Replacement
NOTE: Refer to Inner Wear Pad Calibration pg 4-8 of this
section to determine Wear Pad shim thickness.
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.
REFERENCE ONLY