Dawson HPH 1200, User Manual

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6.6 Hammer runs erratically
a. Air in hydraulic system - see section 3.4.2.
b. 'Cold' hydraulic oil - see section 3.4.4.
c. Accumulator pressures incorrect or bladders damaged.
See Appendix 7.2.High pressure accumulator - 100 bar (2 off)
Low pressure accumulator - 3 bar (2 off)
d. Blocked filter on hammer - see section 4.2.b.
e. Not enough hydraulic flow/pressure from power pack - check flow rate gauge and pressure
gauge.
f. One or both sensors damaged/contaminated - see sections 6.4 and 6.5,
6.7 Excessive hose 'jumping'
Check accumulator pressures/condition - see Appendix 7.2.
6.8 Hammer 'jumping' excessively on pile top - reduce stroke immediately
and/or stop piling
a. Too much hydraulic oil input - set to 75 l/min.
b. 'Cold' hydraulic oil - see section 3.4.4 and reduce stroke. To warm the oil see section 3.3.1.
c. Stroke adjuster set too high - reduce
immediately to continue working.
d. Suspension blocks (1-025-00-01) and ring (1-025-00-05) damaged. Inspect and replace
immediately, if necessary.
e. Incorrect operation of top sensor assembly i.e. cam wear and/or incorrect roller travel.
6.9 Stroke height indicator will not move
a. With the power pack running and control pendant connected, check pressure gauges when '
↑
'
and '
↓
' are pressed. If no readings, check relevant valve and wiring/fuses in power pack.
b. If readings are O.K., check hoses to hammer. If these are O.K., check restrictor orifices for
blockages - these are the male/male adaptors located on the inlet manifold
c. If these are clear remove front leg guide and check height adjusting ram (1-026-00-01) and top
sensor assembly.