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b) Unscrew the suction valve housing from the unit and assess its
condition. Clean it of residues in a suitable solution.
c)
Lubricate its O-ring and reassemble it in the unit by tightening it with
a torque of 31-36 Nm.
d) Reinstall the suction hose with the strainer at the end.
3.4.9 Replacing the suction apparatus seals
IMPORTANT: before servicing the seals, first relieve any accumulated pressure
in the unit and hose - see more details in the "Working with the unit" section.
Then disconnect the unit from the power source.
a) Disconnect the suction hose.
b) Unscrew the front housing - 4 T20 torx screws.
c)
Remove the yoke bolt and washer securing the locking pin that
connects the yoke to the piston.
d) Rotate the pump shaft so that the piston is in the top dead center
position - this can be done by pushing the yoke. This is necessary to
remove the necessary parts.
e) Unscrew and remove the valve assembly.
f)
Remove the piston assembly by pushing it down around the yoke.
g) Unscrew and remove the top nut using an adjustable wrench.
h) Remove the worn sealers using a flathead screwdriver or drift.
Remove the upper seal from the top and the lower seal from the
bottom by pressing on its sides and pulling it out. When doing so, be
careful not to scratch the surface the sealers are sitting on.
i)
Clean the surfaces for the new sealers.
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