CALIBRATING THE DYNAMOMETER.
1. Remove the cam from the Control Box and rotate the cam mounting in a counter clockwise direction so that the RED
pointer is moved to the extreme right-hand side of the scale.
2. Set the BLACK pointer to read zero with the hook block resting on the ground, (Adjuster at top right-hand side of
3. Rig a convenient number of parts of line, set the scale of the indicator so that the correct number of parts appear in the
window on the dial. (Adjuster at top left-hand side of dial).
a. Hoist the maximum possible known weight within scale for that particular reeving.
5. Set the Dynamometer by rotating the long hexagonal nut in the center of the Black dial after slackening the locknut on
the opposite side of the Dynamometer just sufficient to allow the long nut to be turned with a wrench. Turn this nut and
shaft until the correct load reading is obtained on the black pointer in the Control Box. Tighten the locknut, lower the load
so that the block is at rest and recheck the zero reading (which may have to be readjusted). Hoist the load again and
recheck the black pointer reading, readjusting the Dynamometer, if necessary. Repeat this procedure until a consistently
accurate reading is obtained. It is wise to "exercise" the system 5 or 6 times to be sure of the readings.
Using a 1/I" diameter drill, drill through the Black dial on the Dynamometer from the opposite side of the center block using
the guide hole provided. Place the locking pin, attached to the chain, through this hole.
SETTING THE RED POINTER READING AT THE CONTROL BOX.
a. Rig the crane with a convenient length of boom, preferably short, and reeve the hoist rope to suit the length
of boom chosen.
b. Turn the adjuster on the dial of the Control Box so that the correct number of parts shows in the window on
c. Fit the correct cam to the Control Box, i.e., marked with the boom length, number of parts of line and
outrigger condition, (see "Operators Instructions-Adjustments") ensuring that the cam is correctly located on its boss and
with the follower pin in the cam slot.