5-9
RT765E-2 SERVICE MANUAL HOIST AND COUNTERWEIGHT
Published 9-04-2014, Control # 422-08
by using a tape measure. With the boom at 0 degree, tie
the line tight to the boom nose and have it in the center
of the right hand boom nose sheave.
NOTE: If this special equipment is not available, sufficient
accuracy in locating a centerline may be obtained
by using a steel square against the machine’s inner
surfaces of both flanges. It is advisable to avoid
using any cast surfaces in this procedure unless a
check from both flanges indicates that the resultant
line is straight.
3. Tie the line around the hoist drum so that the line is very
tight and the line is crossing the absolute center of the
drum at the centerline mark you put on the drum.
4. Using a protractor, lay it on the vertical line on the hoist
drum so the string line is in the center of the protractor.
The string line will be at the 90 degree mark on the
protractor if the hoist is straight with the boom nose
sheave. If it is not at the 90 degree mark, the hoist
mounting bolts will have to be loosened and the hoist
moved so it is.
NOTE: This test is for cable leaving gaps while spooling.
5. Elevate the boom above 45 degrees boom angle to
check if the hoist is level. Reposition the hoist drum and
tighten the cord so you can have the cord in the center of
the protractor at the 90 degree mark. If the cord is not at
the 90 degree mark, the hoist will have to be shimmed
until the cord is at the 90 degree mark.
NOTE: This test is for cable piling up on one side of the
hoist drum.
CAUTION
Do not alter holes or stop blocks on the crane mounting
plate, as very small adjustments result in large angular
changes. Extreme care should be taken to avoid over-
correction. Damage to the hoist or wire rope may result.
Locating Centerline With Square
Main Hoist Is Aligned To The Right Hand Sheave
Auxiliary Hoist Is Aligned To The Center Sheave
FIGURE 5-5
6019
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