Dawson EMV-300, Operator'S Instructions/Spare Parts List

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hangs too far away from the clamp when it is raised to the vertical – this will
make it difficult to engage the pile in the clamp.
d. Clear all personnel standing in the Danger Area and lift up the pile until it just
hangs freely off the ground.
e. Lower the pile slowly so that the pile can be correctly inserted into the clamp.
Once firmly inserted, close the jaws.
f. Manoeuvre the pile to the insertion point and push the pile slowly into the ground.
Plumb the pile and ensure all personnel are out of the Danger Area.
g. Start the vibrator and adjust (crowd) the hydraulic rams so that the vibrator is level
and always sits directly on top of the pile as it goes into the ground. Do not over
push the vibrator - stop pushing when the gearbox starts to vibrate against the
rubber stops on the underside of the saddle. With the EMV300 the deflection is
146mm (5.75”).
h. When the pile has reached the required depth turn the vibrator off by returning the
control lever to the central position and allow all vibrations to stop. Release the
hard jaws from the pile by slowly operating the control lever in the opposite
direction. Do not operate the control lever from one extreme position to the other
whilst the EMV is running – it will cause hydraulic system pressure spikes to
occur.
i. Remove the chain clamp and lifting chain from the pile lifting hole.
j. Repeat steps b-j to continue.
k. When piling progress is less than 100mm/min (4ins/min) release ground
resistance by augering or by water jetting. Under no circumstances should the pile
be forced any further.
5.3 Extracting Piles.
a. Ensure that all safety procedures and maintenance has been carried out before
starting the excavator – see section 5.1.
b. Ensure that it is safe to move the dipper arm. Release the stand from the jaws of
the vibrator by operation of the retract bucket ram control function in the cab.
Manoeuvre the vibrator above one end of the pile to be extracted so that there is
enough distance to allow safe insertion of the lifting chain through the hole at the
top of the pile.
c. Insert the lifting chain correctly (no twists, knots etc) through the lifting hole in
the pile and secure with the chain clamp. Allow enough free chain length for the
pile to rotate to horizontal during the lowering process without jamming
against the underside of the clamp body. If this happens the chain will be
overloaded, may subsequently break and allow the pile to fall – this is a sever
hazard to all site personnel and must be avoided at all times.
Under no
circumstances should a pile be pulled using the lifting chain only.