Dawson EMV 550, Owner'S Manual

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The Excavator Mounted Vibrators have been designed to give years of trouble free service. Providing the
equipment is treated with respect and the basic maintenance procedures are adhered to there will be little
work additional work required.
The most important points are correct installation on good quality excavators, cleanliness when connecting to
the excavator’s hydraulic system and regular gearbox oil changes using appropriate oils - again cleanliness
is paramount.
Visual inspection of the EMV by a competent person on a daily basis and before being taken into service can
prevent many potential problems from occurring. Ensure that lifting accessory test certificates are correct and
valid at all times.
• All service and maintenance work must be carried out by qualified personnel using original
Dawson parts. The use of other parts will invalidate the whole warranty for the equipment.
• The equipment should be inspected at ground level only and should be positioned so as to
be stable at all times.
• Secure the equipment against unexpected starting during the maintenance process.
• The equipment should be inspected by a Dawson technician or by one of their approved
distributors once a year or every 1000 working hours.
DAILY MAINTENANCE
a. Grease the two grease points on the EMV550– one on the Saddle Swivel and the other on the side
of the Clamp Body. Two or three pumps with a molybdenum-based grease will be adequate.
b. Check machine labelling.
c. Check visible screws, bolts, fittings etc for tightness.
d. Visually inspect all hydraulic hoses and fittings for leaks or damage.
e. Check the gear oil level in the vibrator. The level must be half way up the sight glass.
f. Inspect the lifting chain and chain clamp for damage. The chain should be in good order, free from
any structural damage or permanent deformation of any kind. The chain clamp should also be free
from any structural damage and its correct operation and safe function should be checked by
depressing and releasing several times – any binding or hesitancy with its operation should result in
it being changed for a new certified item. The chains Coupler and anchorage point should be in
good order showing no signs of damage, wear or cracking.
Remember if in doubt change it – lifting chains in the UK are required to have a thorough examination by a
competent person at intervals not exceeding 6 months. Any local/national requirements must be adhered to!
g. Inspect the condition of the Hard Jaws. To be acceptable these should look to be in almost as new
condition. The teeth on these pads have some flats on them when new (approximately 1mm). Over
time they will round off, flatten out more and even become chipped. If not changed when require
they will loose their grip on the pile during driving and certainly during extraction. Besides causing a
reduction in performance this can become a safety hazard. We define the following wear limit:
Hard Jaw Wear Limit - 90% of all teeth on any hard jaw should make contactwith the pile and 80% of all teeth
should have points with flats no greater than 3mm.
Changing the Hard Jaws – Static Side
Remove the Cap Screw that hold this jaw in place. Tap out the old jaw and clean/inspect the clamp body
seating area to ensure the faces are in good order. Slide in the new jaw and check that it is a snug fit – the
maintenance
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