CAPACITY CHART INFORMATION
F2081-14
CRAWLER BLOCKING DIAGRAM
Figure 1 shows proper blocking of the crawlers for the
following operating conditions:
• Raising and lowering booms, boom and fixed jibs, tower
attachments, and luffing jib attachments which require
increased stability as stated on the capacity chart.
• Capacity chart ratings which require front of crawlers to
be blocked (limited swing).
• Capacity chart ratings which require front
and
rear of
crawlers to be blocked (360° rating).
Hardwood or steel blocking must provide even support,
equal to the width of crawler pads under the centerline of the
crawler rollers and/or the tumblers.
Blocking must be thick
enough to maintain dimensions given in table even after
ground and blocking are compacted.
The blocking ensures that the centerline of the crawler rollers
or the tumblers becomes the tipping fulcrum.
WARNING
READ CAPACITY CHARTS!
Do not attempt to operate crane without first reading and
understanding capacity charts.
Crane must be rigged, blocked, and operated according
to instructions given in capacity charts.
All operations must be performed with crane level as
specified in capacity charts; otherwise crane could tip.
Failing to comply with capacity charts can result in tipping
or structural failure of boom, boom and fixed jib, tower
attachment, or luffing jib attachment.
Death or serious injury to personnel can result.
CAUTION
Crawler Damage!
DO NOT extend blocking into area of intermediate rollers.
Damage to crawler components may result.
X
Y
C
L
C
L
B173
FIGURE 1
Intermediate
Rollers
Tumbler (Drive) End
Roller End
395143
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