■
Ground Control Switches
Machines with Hydraulic Controls
Figure 9.21 - Ground Control Switches
With the Ground/Platform Selector
set to
ground:
Check that each of the boom moving valve levers
(see Figure 9.22) (
through to
) cause the
MHP15/44HD to move the way it should.
Check the valves in both di rec tions.
For cor rect op er at ing pro ce dures see the “Op er a -
tion” chap ter 10.
Figure 9.22 - Ground Boom Controls
Pay particular attention to the Emergency
Stop switch
(see Figure 9.21) to see that it
turns the MHP15/44HD engine off when the
red button is struck.
■
Emergency Lower
Machines with Hydraulic Controls
❑
Lower control station
With the booms raised open the
Emergency
Lower Valve
on the side of the column(see Figure
9.23).
Figure 9.23 - Ground Emergency Lower Valve
The up per boom should be gin to lower im me di -
ately.
To re tract the fly boom op er ate the fly boom le ver.
To lower the lower boom op er ate the lower boom
le ver.
To test the slew while low er ing op er ate the slew le -
ver.
NOTE 1 Emergency Lowering:
Slewing, retracting the fly boom and lowering the
lower boom during bleed down must be
accomplished before the upper boom is fully
lowered.
NOTE 2 Emergency Lowering:
The manual emergency lower valve must be
closed after the test to ensure proper boom
operation.
For detailed emergency lowering procedures see
“Emergency Operation” chapter 11.
❑
Upper control station
With the booms raised open the
Emergency
Lower Valve
in the basket (see Figure 9.24 and
Figure 9.24.2)).
Figure 9.24 - Platform Emergency Lower
Valve - Steel Platform
MHP15/44HD – 12885A
Rev F
page 9 - 7
9. Pre-operational Inspection
IMPORTANT