TM 5-3810-306-20
NOTE
Ensure that front side thrust pads are
in contact with telescope section.
d.
Lower front and rear outrigger jack cylinders on
right side of crane until the crane tilts slightly.
This will cause the right side of the boom to ride
on the retracted rear side thrust pads.
e.
While a crane operator slowly extends telescope
section, slowly turn forward adjusting screw of
front side thrust pad on left side of the boom.
screw in and out in order to "feel" the changing
width of the telescope section. The wide point in
telescope section will be indicated when the
adjusting screw is backed out furthest.
f.
As the telescope section is extended, mark the
locations which "feel" wide.
g.
Upon full section extension, measure the
distance across the bottom of the telescope
section at each mark to determine the widest
point. Clearly mark the widest point.
h.
Retract the telescope section until the mark is
lined up with the front side thrust pads.
i.
Turn left front side thrust pad adjusting screws in
snug and back out 1/6 of a turn. When cycled if
boom is sluggish or binding, continue to back out
screws at 1/6 of a turn increments until smooth
cycle operating is achieved. The width between
front side thrust pads is now set and will not
change.
j.
Measure distance between front and rear side
thrust pads. Record this distance.
k.
From mark on telescope section measure
distance recorded in step j forward. Make
another mark on telescope section.
l.
Retract telescope section until new mark is
aligned with front side thrust pads. This will
position widest point in line with rear side thrust
pads.
m.
Turn left rear side thrust pad adjusting screws in
until snug. Do not back-off on these screws.
n.
Turn right rear side thrust pad adjusting screws
in until snug and then back off 1/6 of a turn.
Distance between rear side thrust pads is now
set.
2.
CHECK AND ADJUST TELESCOPE TO BASE
SECTION ALIGNMENT.
a.
Level crane by raising right front and rear
outriggers.
b.
Measure across the top outer end of the boom
base section and telescope section. Mark center
point of each section.
c.
Route auxiliary hoist cable over center sheave
on boom nose. Attach a weight to cable to help
keep cable taut.
d.
Elevate boom until cable is suspended (i.e., not
resting on top of boom) between boom nose
sheave and hoist drum.
e.
Measure distance across back of auxiliary hoist
drum and mark center of drum.
f.
Lower auxiliary hoist cable until cable lines up
with mark.
17-10
