Adjusting the pneumatically operated 4-way valve
Pic. 6.4
• 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 (7) to the
inferior support (2).
• Clean the inner part from the lubricant.
• “Mark” the initial position of the cock (1). When mounting the cock
back in place, it must be in the same position.
• Turn the valve until one of the cock regulation ferrules (5) coincides
with one of the threaded holes on the inferior flange (2). Block
temporarily the nut ferrule with a screw.
• Hold the valve in place with a 17 mm spanner and loosen the nut
(4) over the ferrule by ½ - ¾ turn with a 36 mm spanner.
Pic. 6.5
• 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
• The valve - in both its end stroke positions - must separate the air
flow sucked from the pump outlet air. The pump may be started in
order to check for the proper functioning.
• Lubricate the areas near the ferrule in order to guarantee the
lubrication of parts undergoing wear.
• Set the top cover back into place. Do not forget the OR-Ring (6).
Fasten the 4 screws.
Replacing the vanes
• Remove the vacuum pump from its bearing frame and wash it
before disassembling.
Pic. 6.7
• Drain the cooling liquid from the pump housing.
• Remove the water pump cover (1) and the carter (2).
• Disconnect lubricating pipes (3).
• Remove the lubricating pump (4).
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