Under no circumstances should the
boom be pulled tight against the stops
while supporting a load. If the load is
lowered with the boom against the
stops, the tension within the boom
hoist cable will collapse the boom
over the backstops. Always keep a
few inches of clearance in the
d. To Hold Boom in Position. Allow boom hoist lever
to return to neutral position. This sets boom hoist brake.
Make sure boom hoist pawl control is engaged.
e. To Lower the Boom. Disengage boom hoist pawl.
Push boom hoist lever away from operator to release the
boom hoist brake and allow the boom to lower by gravity.
(See Caution note above).
Figure 9. Stopping the engine.
f. To Raise the Load. Pull the main hoist lever (4,
Figure 10. Gantry in lowered position.
c. To Raise the Boom. Pull boom hoist lever (6, fig.
7B) toward operator
to rotate the boom hoist line drum
and raise boom. Be sure boom hoist pawl control is
Figure 11. Gantry in working position