d. Hoist a known load equal to the S.W.L. at approximately half the maximum radius available for that boom
e. Boom OUT until this radius is obtained, using a
steel tape to measure the distance NOT the crane radius indicator or Control Box radius scale (if fitted).
f. Check the RED pointer reading at the Control Box. This should indicate the Safe Working Load for that
If this reading is incorrect the angle of the Actuating Arm in the Control Box must be adjusted by means of the turn- buckle
or adjustable arm (see "Installing the Boom Foot Fitting"), until the RED pointer reading is correct. If the Boom Foot pulley
is of the type with no adjustment, then this correction must be made by means of the nipple on the drive.
g. When a correct reading is obtained, boom IN until well within the working radius and then boom OUT
against the tape to that radius and check the RED pointer again. Repeat this until a correct reading is obtained, adjusting
the turnbuckle (or flexible drive) if necessary.
h. This procedure should be repeated at both minimum and maximum radii, hoisting the S.W.L. for each of
these radii, when it should be found that only a very slight adjustment of the turnbuckle or (flexible drive) may be required
at the minimum radius setting. All settings are now complete and the Indicator should be accurately set for all boom
If radius scales are fitted, these are automatically corrected by the preceding adjustments made to correct the
RED pointer on the Load Indicator Scale.
It will now be found that the Amber light will light at 90% S.W.L. and the Red light will light and the Alarm will ring
at 100% S.W.L.