Replace the vanes when their wear exceeds 10
m\m (L – L min): they may break. Replace all
vanes at the same time.
Checking the gear box oil level
• Check the level when the
pump is cooled: it must almost
reach the threaded port. Refill if
necessary.
• For a complete replacement,
0.7 litres are required. Use mineral
oil with EP additives for gears and
transmissions.
• When changing the oil, also replace the outlet plug washer.
Dispose of exhausted oil as provided by current
specification.
6.2. Extraordinary maintenance
• Before starting any extraordinary maintenance operation, be sure
the pump stands still and follow the safety prescriptions as described in
Cap. 3.
Adjusting the 4-way valve
• For pumps equipped with handle for manual operation or hydraulic
actuator.
• Adjust the screws to avoid the valve blocking in its seat (see Fig.
6.3).
Attention: do not exceed with the adjustment:
possible vacuum loss.
Pic. 6.3
Adjusting the pneumatically operated 4-way valve
• In case of reduced performance or difficult rotation of the valve in
its seat, it is necessary to adjust the operating play.
• Unscrew the 4 screws M8x16
which fasten the top cover (P3) to
the inferior support (P2).
• Clean the inner part from the
lubricant.
• “Mark” the initial position of the cock (P1). When mounting the cock
back in place, it must be in the same position.
• Turn the valve until one of the cock
regulation ferrules (P6) coincides with
one of the threaded holes on the inferior
flange (P2). Block temporarily the nut
ferrule with a screw.
• Hold the valve in place with a 17 mm spanner and loosen the nut
(P4) over the ferrule by ½ - ¾ turn with a 36 mm spanner.
Pic. 6.4
• Valve adjustment: turn the valve clockwise by 1/8 turn (45°) in
order to lower it (in case of excessive play between the valve and its
seat and of reduced performance) or anticlockwise by 1/8 turn (45°) to
raise it (in case of difficult rotation of the valve in its seat).
• Hold the valve in place with the spanner and fasten the nut (P4)
above the ferrule.
• Remove the screw which temporarily blocks the ferrule and check
for the correct rotation of the valve by adjusting the shaft frame. Repeat
the valve adjustment, if necessary.
Pic. 6.5
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