Snorkel TL39T - Manual (Page 59)

Rev C page 9-3
2. Open the manual valve to lower the upper
boom. This valve is located at the base of the
main lift cylinder for the upper boom in the
floating turret.
Operation of this valve is the same as for the
previously described lower boom. The upper
boom will begin to descend.
NOTE
It is not possible to slew or telescope in during
emergency lowering from the ground control
station.
Figure 9.7 - Manual Lowering Procedure
Decal
! IMPORTANT
At the completion of this operation the manual
emergency bleed down valves for the upper
and lower booms must be reset (closed). This
is achieved by pushing each valve in and
turning it clockwise 180° and then releasing
it.
Failure to do this will prevent normal
operation of the booms and platform.
9. Emergency Operation
13276
Emergency Lowering
Procedure
Push the red button in and
turn it counter-clockwise
180 o to open valve and lower
the boom
Closed Open
STAY CLEAR OF STRUCTURE
DURING BOOM DESCENT
Push button and turn clockwise 180 o
to close valve for normal operation