Upper Telescope Cylinder; Description - Manitowoc Grove RT880E Service And Maintenance Manual

RT880E SERVICE MANUAL

UPPER TELESCOPE CYLINDER

Description

The upper boom telescope cylinder Figure 2-46 has a 17.7
cm (7.0 inch) bore and is internally ported (rod ported). Oil
from the telescope control valve is routed to the cylinder by
external lines. Foreign material is prevented from entering
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7403-1
Grove
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Published 11-10-2014, Control # 524-00
the cylinder during rod retraction by a wiper ring in the head
and O-ring seals prevent internal and external leakage. The
retracted length of the telescope cylinder is 399 in (1013.5
cm) and the extended length is 746.5 in (1896.1 cm) from the
end of the barrel to the end of the port block on the rod.
The cylinder weighs 2181.9 lb (989.7 kg).
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3
2
HYDRAULIC SYSTEM
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1
FIGURE 2-46
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2-81