Priming Of The Pump; Upm And Upc Models With 4/3 Directional Control Valve; Upl And Upc Models With 4/2 Directional Control Valve; Maintenance - Bell UPM 252 Gebrauchs- Und Wartungsanleitung

6.3 - Priming of the pump

WARNING
IMMEDIATELY AFTER THE PUMP INSTALLATION, THE CIRCUIT MAY CONTAIN AIR LOCKS WHICH PRE-
VENT PRESSURIZATION. IF THE PUMP IS UNABLE TO PRESSURIZE THE OIL CIRCUIT, PROCEED AS
DESCRIBED BELOW.
THE OPERATIONS DESCRIBED BELOW MAY BE PERFORMED ON THE PEDAL USING THE HANDS, SOLELY
IF YOU PRESS ONLY THE APPROPRIATE ZONES INDICATED ON THE PEDAL ITSELF
IF THE PUMP IS MOUNTED VERTICALLY, DISASSEMBLE IT AND PLACE IT IN A HORIZONTAL POSITION
ON THE FLOOR.

6.3.1 - UPM and UPC models with 4/3 directional control valve

● Press the pump treadle and position the valve (or control lever) on releasing position, i.e. pos.2 (fi g.9/b, page 5) for about 15 seconds.
● Connect to a cylinder and check that the pump is primed. If the cylinder does not move. Repeat the operation.

6.3.2 - UPL and UPC models with 4/2 directional control valve

● Using a suitable pressure hose, connect the pressurized oil delivery port to the drain side and press the treadle for about 15 seconds.
● Connect to a cylinder and check that the pump is primed. Repeat the operation if the cylinder does not move.

7 - MAINTENANCE

The routine maintenance work described below must be performed exclusively by a skilled technician who has a thorough knowledge of
the pump and its operation and who has read this manual completely. Maintenance must be carried out with maximum caution to prevent
possible accidents. This chapter describes the only maintenance procedures permitted. Execution of any unauthorised maintenance
work will automatically invalidate the warranty and free the manufacturer from all liability.
BEFORE ANY OPERATION OF MAINTENANCE THE PUMP MUST BE DISCONNECTED FROM THE PNEU-
MATIC CIRCUIT. THEN UNLOAD THE OIL PRESSURE IN THE HYDRAULIC CIRCUIT.

7.1 - Checking connections

Periodically check the hydraulic and pneumatic connections. Ensure that the connections on the pump are screwed down tightly and
show no signs of breakage, cracks or other damage. Ensure that the hoses are not damaged in any way (cuts, abrasion, cracks, etc.).
If you use the pump in an intensive manner, we suggest a weekly check.
7.2 - Cleaning the air fi lter
Periodically clean the air fi lter.
If you use the pump in an intensive manner, we suggest a weekly check.
The air fi lter is inside the inlet pneumatic fi tting (fi g.10, page 5).
● Use a slotted tip screwdriver of the appropriate size to unscrew the fi lter from the air inlet connection until it is extracted.
● Clean the fi lter with compressed air and then refi t and screw it into position. Do not over-tighten the fi lter or damage may ensue.
● Reconnect the air line quick coupler after binding the thread with Tefl on tape.
If the air fi lter is excessively contaminated or damaged, it must be renewed. Order a new fi lter from the manufacturer, referring to the list
of spare parts at the end of this manual.
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