C20008IE – Pneumatically driven pump - Rev. 0 February 99 Page 7 of 9
INDICATION
The pump does not deliver oil or
does not deliver oil in the exact
quantity prescribed
PROBABLE CAUSE
•
The oil in the tank is below the
minimum level
•
The suction filter is dirty or
blocked
•
The pump control valve fails to
discharge
•
The internal connections are loose
The pump does not deliver oil at
•
Incorrect regulation of the
the prescribed pressure
supply air/oil.
REMEDY
•
Fill the tank with oil without
exceeding the MAX level line
•
Remove the pump from the
tank, remove the filter, wash it
and blow it through with
compressed air.
•
Check that the pump control
valve is a 3-way type for the
single action pump and 4 way
for the double action; verify that
the valve regularly discharges
compressed air oil from the
pump chamber.
•
Tighten all connections
ensuring there are no leaks
•
Regulate the pressure of the
oil/air within the range shown
in the general characteristics,
taking into account the
compression ratio.
3.8
Dangers present in use
The verification of conformity with the essential safety requirements and regulations of the Machine Directive is
effected by means of the compilation of a check list which has been pre-prepared and is contained in the
technical
file.
The lists which are utilised are of three types:
•
list of dangers (as in EN 414 referring to EN 292)
•
application of essential safety requirements (Machine Dir. - att. 1, part 1)
•
electrical safety requirements (EN 60204-1)
The following is a list of dangers which have not been fully eliminated but which are considered acceptable:
♦
it is possible to encounter low pressure oil squirts during maintenance (for this reason appropriate
protective clothing must be worn).
♦
contact with oil -> see the requirements for the use of suitable personal protective clothing.
♦
pre-loaded springs
in the control cylinder and, where fitted, in the tank.
♦
use of unsuitable lubricant -> the characteristics of the fluid are shown on the pump and in the manual
(
in case of doubt contact the Eng. Dept of Dropsa Spa
)
♦
protection against direct and indirect contact must be provided by the user
♦
given the purpose of the pump it must always be functioning; for this reason it is necessary to pay
attention to the electrical connections which, in the case of a power failure, the customer’s machine is
restarted only by means of a reset, while the lubrication pump is able to restart.
♦
take care NOT TO clean with alcohol
