6.2 Changing the UUHWDUU Weight Setup
By changing size (mass) of the HWD drop weight, any of 4 loading ranges can be selected
(refer also to 5.2, “Drop Heights Adjustment”).
The HWD drop weight consists of a basic 240 kg (535 lbs) weight, to which may be added
two, six or ten detachable 50 kg (110 lbs) weights.
Each detachable 50 kg (110 lbs) weight is subdivided into two 25 kg (55 lbs) subweights for
easier handling.
Each 50 kg weight can be mounted EITHER on one of the 10 studs on the basic 240 kg (535
lbs) drop weight OR on one of the 10 “stand-by” studs on the subunit frame.
In this manner it is possible to constitute four different sizes of active drop weight as shown in
the figures on the following page. The 25-30 msec. duration of the load impulse will be
maintained for any drop height with any of the weight setups.
Refer to 5.2, “Drop Heights Adjustment” for advice on selection of the drop weight mass
(size), once you know which load (range) you wish to use.
Each 50 kg weight is fastened to its stud by a tubular nut with a 36 mm hex head (for which a
matching wrench is provided). A split pin at the end of the stud prevents the tubular nut from
unscrewing in case it should loosen by itself.
To move a 50 kg weight from a stand-by stud to a basic weight stud (or vice versa), use the
step-by-step procedure below.
1) Make sure that the HWD is in its transport position, i.e., that the subassy. has been raised
to its topmost position and that the transport locks are in their locked position.
2) Remove the split pin from the weight stud in question.
3) Unscrew and remove the tubular weight holding nut while supporting (i.e., keeping
vertical) the weight by holding the top handle of the outer subweight.
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