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13. Emergency Lower Control: Allows the
platform to be lowered in the event of an
emergency (see Figure 7.3).See Chapter 11
"Emergency Operation" for details of
emergency lowering procedures.
Figure 7.3 - Ground Controls, Emergency
Bleed Down Control Valve
Platform Control Box
Con trols for op er at ing the MHP15/44HD from the
plat form (up per con trols) are lo cated on the plat -
form con trol box, with the ex cep tion of the foot
switch which is on the plat form floor.
Upper controls:
Emergency stop switch
Choke
Start switch
Boom speed switch
Emergency lower switch
Platform rotate switch
Lower boom switch
Upper boom switch
Jib boom switch
Slew switch
Lift enable indicator
Foot switch
1. Emergency Stop: Press the red
EMERGENCY STOP button in, at any time,
under any conditions, and the entire machine
stops, and nothing moves. This switch must
be out (on) to start or run the MHP from the
platform control box. Pull the switch and it
will pop out (on). Press the switch in (off) if
the platform is to stay in one position for a
long time. That will turn the engine off and
and save fuel.
MHP15/44HD – 12885A
2. Choke/Cold Start: Hold the switch UP while
you start an engine that is at ambient air
temperature (a "cold" engine). This will choke
the engine.
3. Start: This switch works like an automobile
ignition switch. Hold it at START until the
engine starts, then release it to ON (-). If the
engine dies in ON, the key must be turned to
OFF (O) before it will go back to START.
Turn the switch to OFF if the platform is to
stay in one position for a long time, that will
turn the engine off and save fuel.
4. Boom Speed: This control determines how
fast the booms move. Set it to SLOW (turtle)
until you are very familiar with the way the
machine works or if the platform is working in
dangerous or cramped surroundings.
5. Emergency Lower: If the engine stops and
cannot be restarted, hold the switch down
and this will lower the upper and lower
booms (not the jib boom). To slew during
emergency lower operate emergency lower
and slew switches together.
Items 6 through 10 are the plat form mov ing
switches. Each is a three po si tion, mo men tary con -
tact, nor mally OFF switch.
6. Platform Rotate: (Option) LEFT rotates the
platform left. RIGHT rotates the platform
right.
7. Lower Boom: UP raises the lower boom.
DOWN lowers the lower boom.
8. Upper Boom: UP raises the upper boom.
DOWN lowers the upper boom.
9. Jib Boom: UP raises the jib boom. DOWN
lowers the jib boom.
Figure 7.4 - Upper Control Box Controls
Rev F
7. Controls - Electric
page 7 - 3
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