Operation From Ground Control Position; Emergency Operation Procedures Machines With Hydraulic Controls; Operation From Platform Control Station - Snorkel MHP 15/44HD Operator's Manual

11. Emergency Operation

Operation from ground control position

Figure 11.6 - Manual Lower Valve
1. Open man ual valve
NOTE
To operate the slew function from the ground
control box when using the emergency lowering
valve the Master Key Switch, and Emergency
Stop switch must be on and the
Platform/Ground Selector must be set to
ground. The slew direction can then be selected
using the slew switch
slew function will only operate while the booms
are lowering.
IMPORTANT
At the completion of this operation the
manual emergency bleed down valve must
be reset by turning it clockwise until it is fully
closed.
Failure to do this will prevent normal
operation of the booms and platform.
page 11 - 2
to lower plat form
(see Figure 11.1). The
Emergency Operation Procedures
Machines with Hydraulic Controls

Operation from platform control station

1. Open the emergency bleed down valve in the
platform (see Figure 11.7, & 11.7.2) by
turning it anti-clockwise.
Figure 11.7 - Platform Emergency Bleed Down
Valve - Steel Platform
Figure 11.7.2 - Platform Emergency Bleed
Down Valve - Fibreglass Basket
2. When the valve is opened the upper boom
will IMMEDIATELY begin to descend.
3. To lower the lower boom operate the lower
boom valve lever (see Figure 11.8).
4. To retract the fly boom operate the fly boom
valve lever (see Figure 11.8).
5. To slew while lowering operate the slew
valve lever (see Figure 11.8).
Rev F MHP15/44HD – 12885A