National Crane 600H, Service Manual

Page: 129 / 232

NATIONAL CRANE
08-19-2022 Control # 092-13
4-55
600H SERVICE MANUAL BOOM
4
Telescope Cylinder Installation
The telescope cylinder is installed after the 6
TH
-5
TH
-4
TH
assembly is completed. Assembly and installation of the
telescope cylinder is as follows:
1. Install the extend sheave at the front of the telescope
cylinder:
a. Bolt the shaft to the telescope cylinder with the
grease hole to the rear.
b. Slide the bearing onto the shaft.
c. Insert the wear plugs into both sides of the sheaves.
d. Install the ATB cable guide and wear pad on the
bottom front of the telescope cylinder.
e. Slide the sheave onto the bearing.
.
f. Install the 6
TH
section extend cables as shown in
Figure 4-46. The threaded cable ends need to be
through the holes is the 4th section trunnion. Make
sure the cables are on the cable retaining brackets
as shown.
NOTE: If the cables are not installed on the retaining
brackets as shown in Figure 4-46, the cables will
become lodged between the cylinder and the 6
TH
section boom and damage the cables.
DANGER
Ensure that all stages of the telescope cylinder are fully
retracted prior to
removal of the telescope cylinder from
the boom assembly or prior to installation of the telescope
cylinder into the boom assembly.
Only attempt to extend, retract, disassemble, or assemble
the telescope cylinder when the cylinder is mounted in a
fixture supplied by Crane Care. Failure to do so could
allow uncontrolled movement resulting in.
DEATH OR SERIOUS INJURY
Contact Crane Care for assistance in service or repair of
the telescope cylinder.
Top Front Wear
Pad Assembly
Wear Pad Bolts
Slide the wear
pad assembly
in between the
sections.
FIGURE 4-44
OUTSIDE
INSIDE
CAUTION
The extend sheave is not secured to the shaft. The
sheave can slide off the shaft to the ground and cause
injury to feet.
Wear Plug
Shaft
Shaft
Bolts
Sheave
ATB Cable
Guide
FIGURE 4-45
Grease Hole
to the Rear
Bearing
Wear Pad
REFERENCE ONLY