Operation From Ground Control Position - Snorkel MHP1335 Operation Manual

9. Emergency Operation
UPPER
BOOM
LOWER
BOOM
SLEW
13371-3 REV A
FUEL
ELECTRIC START
Figure 9.5 - Platform Control Box
6. Whilst still operating the enable switch, press
and hold the Emergency Lower switch
down (see Figure 9.5) and the booms will
begin lowering.
7. To SLEW dur ing the emer gency lower the
fol low ing switches (see Fig ure 9.5) must be
op er ated to gether.
En able or (foot switch - Fig ure 9.3)
Emer gency Lower
Up per or Lower Boom Up
Slew
8. To Lower the jib boom dur ing emer gency
lower the fol low ing switches (see Fig ure 9.5)
must be op er ated to gether.
En able or (foot switch - Fig ure 9.3)
Emer gency Lower
Up per or Lower Boom Up
Jib
Both booms will de scend at the same time when
low er ing.
NOTE:
When emer gency low er ing, it is only pos si ble to
Slew or lower the Jib Boom whilst the Up per and
Lower booms are low er ing.

Operation From Ground Control Position

CAUTION
When performing this function, extreme
care must be taken to ensure that the person
carrying out the task does not become
trapped by the structure as the booms
descend.
DANGER
page 9 - 2
LIFT
ENABLE
lb
kg
JIB
BOOM
ROTATE
PLATFORM
SPEED
13371-2
CHOKE EMERGENCY LOWER ENABLE
or
or
DO NOT, under any circumstances, climb
down the elevating assembly to operate
these valves.
There are two man ual bleed down valves to op er -
ate from the ground po si tion. One con trols the de -
scent of the lower boom and the other con trols the
de scent of the up per boom.
The lower boom must be low ered first.
Figure 9.5 - Manual Lower Valve, Lower Boom
1. Open man ual valve to lower the plat form by
turn ing the knob clock wise and holding it in
that position as the boom lowers.
You will need to access the valve by
reaching through the levelling rods (as
shown in Figure 9.5) to prevent any danger
of crushing to your hand.
2. When the boom has fully descended you can
open the valve for the upper boom (see
Figure 9.5.2).
Figure 9.5.2 - Manual Lower Valve,Upper
Rev C MHP13/35 & MHP15/44 V3 – 13619-1
CAUTION
Boom