Idiomas disponibles
Idiomas disponibles
OPERATING AND MAINTENANCE MANUAL
MD SERIES DIESEL FUEL PUMP
Some models of single-phase electric pumps, fitted with motor protectors, could restart
without warning if the motor protector tripped due to overheating: disconnect the power
supply before carrying out any work on the electric pump. Both threephase and single-
phase electric pumps must anyway be permanently connected to the mains power supply
and a suitable protection device installed (suitably rated thermal magnetic circuit breaker
incorporated in the fixed wiring) that ensures an all pole disconnection of the mains power
supply. The maximum permissible tolerance between the actual electrical supply voltage
and the nominal value indicated on the data plate of the electric pump is ± 10% for three-
phase electric pumps and ± 6% for single-phase electric pumps.
11. START-UP AND OPERATION
Make sure that the motor shaft is free to rotate before starting the machine. The smaller
electric pumps have a slot for inserting a screwdriver at the end of the shaft on the fan side
for doing this; if the shaft does not move, lightly tap the screwdriver with a plastic headed
hammer. (Fig.6) Fill the pump body and suction pipe completely with liquid through the
appropriate hole (Fig.1) [for the vertical ULTRA models, loosen the vent "a" (at the top) to
let the air out and loosen the needle by-pass valve "b" on the drain plug (at the bottom).
Once completed, close the by-pass needle valve and the vent without using excessive
force]. Do not under any circumstances operate the pump when it is dry. All the machines,
apart from ULTRA series 18 machines, should rotate clockwise (when seen from the fan
side). In the case of three-phase electric pumps, the correct direction of rotation must
be checked and if necessary, the two phases must be inverted. The single-phase electric
pumps can only rotate in one direction, which is factory pre-set. It will be up to the user
to make sure that the performance of the electric pump falls within the nominal rating
indicated on the data plate. If it does not, adjust the gate valve on the delivery pipe and / or
the pressure at which the pressure switch triggers, if installed
12. MAINTENANCE
Disconnect the power supply before carrying out maintenance and/or repairs.
If work has to be carried out on the machine, the gate valves located on the suction and
delivery pipes must be closed and the liquid drained from the pump body through the
appropriate drain holes; adopt suitable precautions for liquids of >40°C. If there is
a risk of freezing, in the case of prolonged machine stops, the tank and all the pipes must
be emptied completely. (Fig. 2) If the tank and / or switch and / or pressure switch and / or
other hydraulic components (hose, fitting etc.) has/have to be replaced, the work must be
carried out by qualified personnel. In any case, use components that are exactly the same
as the existing ones, in order to guarantee the safety of the equipment.
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