information required to identify the cam is stamped on the face, namely:-
(a) Crane on outriggers, side and rear ratings condition.
(b) Length of boom or jib.
(c) Number of parts of line.
Additional duties may also be catered for, e.g., "Main boom with jib attached" etc., etc., and it is most important to
ensure that the correct cam is fitted to suit the working condition of the crane.
When fitting a cam, locate it over it's mounting spindle and location dowel, turning the cam and geared boss so
that the cam slot lines up with the follower peg protruding from the top bracket of the cross slide. When the cam is
correctly located, fully tighten the wing nut.
On the radius indicator, the scale is also stamped with identifying information and must be changed when different
boom lengths are employed and/or jibs. To change a radius scale, lift it out of it's retaining guides and replace it with the
2. REEVING CHANGE. In most cases, the only adjustment necessary, apart from ensuring that the correct cam is
fitted to suit the number of parts, is to change the scale of the weighing dial in the Control Box so that the correct
number of parts appears in the window on the left hand side of the dial. This is achieved by rotating the knurled
knob at the top left hand side of the Control Box.
3. BLACK POINTER ZERO. This adjustment is made at the Control Box and may be necessary at certain times.
The adjuster is on the top right hand side of the control box and is a recessed screwdriver slot. DO NOT
ATTEMPT TO TURN THIS ADJUSTMENT PAST IT'S INTERIOR STOPS , i.e. WHEN RESISTANCE IS FELT.
Counter-clockwise rotation of the adjuster will cause the black pointer to rise and vice-versa. Once the pointer is
correctly set, slightly rotate the adjuster in the opposite direction to relieve the strain on it. The Indicator should be
lightly tapped during this adjustment.