Snorkel TL39T - Manual (Page 58)

page 9-2 Rev C
Figure 9.5 - Platform Control Box
6. Whilst still operating the enable switch, press
and hold the Emergency Lower switch Œ
down (see Figure 9.5) and the booms will
begin lowering.
7. To SLEW during the emergency lower the
following switches (see Figure 9.5) must be
operated together.
Enable Πor Π(foot switch - Figure 9.3)
Emergency Lower Œ
Upper or Lower Boom Up Œ or Œ
Slew Œ
8. To TELE during emergency lower the following
switches (see Figure 9.5) must be operated
together.
Enable Πor Π(foot switch - Figure 9.3)
Emergency Lower Œ
Upper or Lower Boom Up Œ or Œ
Tele ŒŒ
Both booms will descend at the same time when
lowering.
! IMPORTANT
Slewing and or telescoping the boom in must
be completed before the booms are fully
lowered.
❑ 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
DO NOT, under any circumstances, climb
down the elevating assembly to operate these
valves.
There are two manual bleed down valves to operate
from the ground position.
One controls the descent of the lower boom and the
other controls the descent of the upper boom.
The lower boom must be low ered first
Figure 9.6.1 - Manual Lower Valve, Lower
Boom
1. Open manual valve Πto lower the lower boom
(see Figure 9.6.1). This valve is located at the
base of the main lift cylinder.
To operate this valve push in the red knurled
knob and turn it anti-clock wise 180 degrees
and release it. The lower boom will begin to
descend.
When the lower boom has fully descended you
can open the valve for the upper boom (see Figure
9.6.2).
Figure 9.6.2 - Manual Lower Valve, Upper
Boom
9. Emergency Operation