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National Crane
Published 5-27-2018 Control # 039-06
10-15
800D
CRANE INSTALLATION
STABILITY CHECK
The chassis weight, before the crane is mounted, is intended
for use only as a guideline in determining the total weight
required for the unit to be stable with an 85% tipping factor
(i.e. when lifting capacity load, the unit is at 85% of tipping or
less).
In order to ensure the stability of the unit with an 85% tipping
factor, a live load stability test must be performed on each
completed unit. Proceed as follows:
1. Test the unit for stability on a firm level surface. See
“Proper Leveling of the Crane” on page 10.
2. A Series 800D crane requires RSOD stabilizers for
stability. With the boom stowed, set the unit up level on
the outriggers and stabilizers.
3. When stability testing this unit, select the load from the
capacity chart that at the longest boom extension
matches the radius listed below:
The stability test load will be 1.18 times the load chosen from
the load rating area of the capacity chart.
Example: 8100D
Boom Length:100 ft (30.48 m)
Loaded Radius: 85 ft (25.91 m)
Load Rating:1050 lb (476.27 kg)
Stability Test Load: 1.18 x 1050 lb (476.27 kg) =1239 lb
(562 kg)
(Includes weights of slings and downhaul blocks.)
Be sure the stability test weight is accurate. A 1% increase in
stability test weight will mean up to a 10% increase in
counterweight. Extend the boom to the maximum boom
length and hoist the stability load off the ground. Slowly
boom the load down so the load will swing out, until the
loaded radius is reached. As the boom is lowered keep
hoisting the load up to keep it about 6 in off the ground.
Do not exceed loaded radius.
Slowly rotate the boom throughout the work area. As the
boom is rotated, the boom will have to be raised and/or
lowered to maintain the loaded radius because of subbase
flexure.
On Front Mounted Cranes that are not equipped with front
stabilizers, tipping from stabilizer support to front wheel
support will occur as the load or boom is swung around the
front. Do not attempt to lift rated loads around the front of the
truck unless the unit is equipped with a front stabilizer.
(Except on cranes with a Rear Mounted configuration.)
NOTE: Weights of accessories installed on the boom
or loadline (including downhaul weight) must
be deducted from the calculated load when
checking stability
4. If slight tipping occurs, but load can be kept from coming
in contact with ground by hoisting the load up, unit is
stable. If not, counterweighting will have to be added to
get unit in a stable condition or decal must be added to
define areas of full stability and areas of reduced
capacity because of stability. If the unit is equipped with
a jib, the stability test should be repeated. Use the fully
extended jib capacity multiplied times 1.18 at the lowest
angle that the jib is rated fully extended.
5. When adding counterweight to the vehicle, it is usually
most effective when added as close to the crane as
possible. After adding counterweight, the above
procedure must be repeated to insure the added
counterweight is adequate.
6. If unit is not stable 360° around the truck, a decal must
be added showing the working area according to
stability.
Model
Boom
Length
Loaded
Angle
Loaded
Radius
851D
869D
880D
890D
8100D
51 ft (15.54 m)
69 ft (21.03 m)
80 ft (24.38 m)
90 ft (27.43 m)
100 ft (30.48 m)
37°
36.5°
28°
33.5°
32°
40 ft (12.19 m)
55 ft (16.76 m)
70 ft (21.34 m)
75 ft (22.86 m)
85 ft (25.91 m)
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 ...