Dawson HPH 1200, User Manual

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3.4.2. Bleeding air from the hammer hydraulic system - only required
when running hammer after initial connection or following a repair
When running the hammer for the first time after initial connection to the power pack, there will be
air in the hydraulic system. The hammer will 'bleed' this air automatically but the following
procedure must be applied:-
a. Run the power pack at 2300 r.p.m.
b. Turn on the control pendant 'power' button.
c. Adjust the stroke height indicator to minimum using the '
↓
' push button.
d. Set the 'Auto/Man' turn button to 'Man.'
e. Hold the 'start' push button down for 2-3 seconds.
f. Repeat (e) three or four times until the hammer consistently gives one or two small blows each
time. Providing the hammer does not 'jump' on the pile, hold the 'start' push button down, so
that the hammer gives several consistent blows, on the next operation. (Approximately 120
blows per minute.) If the hammer 'jumps' on the pile, because the drop weight is hitting the top
of the hammer casing, the hammer will stop automatically. To reset see section 3.4.4.
g. Commence the piling operation using the hammer as required.
3.4.3 Pile driving with the hammer
Having the hammer sited on the pile and removed air from the hydraulic system (if necessary) as
described above, the hammer is ready for pile driving:-
a. Increase the power pack engine speed to 2300 r.p.m. (having followed - "Starting the power
pack" section 3.3)
b. Turn the hand control pendant 'power' button on.
c. Adjust the 'stroke height indicator' on the side of the hammer to minimum stroke by pressing the
'
↓
' push button.
d. Set the 'Auto/Man' selector button to the required position:
'Auto' - hammer will continue running automatically when the 'start' push button is pressed once.
'Man' - hammer will only run whilst the 'start' push button is held down.
e. Depress the 'start' push button as required by 'Auto/Man.'
f. During operation the hammer stroke may be altered using the '
↑
' or '
↓
' push buttons to adjust the
stroke height indicator.
g. To stop the hammer whilst it is running on 'Auto,' turn the 'Auto/Man' selector to 'Man' or turn
the 'power' selector off.