HARBEN CENTURY, Service Manual

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Flowplant Century Pump Manual
4.3.8.3 Change Cylinder (25), Piston (26) and Slipper (27)
i. Unscrew and remove Screw (100). Plug (39) may come out with the Screw or when
the Cylinder is removed.
ii. Unscrew and remove the Cylinder (25).
Note: Although the previous operation is all that is necessary to change a Cylinder, it is well
worth removing the Spring (35) and the Diaphragm Protection Valve (33) and cleaning them
thoroughly. Always keep the Valve components in matched pairs at all times.
iii. Inspect the Seal (73) in Seat (34) and replace if necessary, and fit '0' ring (74) into
greased groove.
iv. Gently push Valve (33) into Seat (34), taking care not to damage Seal (73) and
ensuring the Valve touches down onto the Seat. Place complete assembly into the
Barrel.
v. Place Spring (35) into the Valve.
vi. Fit '0' ring (74) in the greased groove of the Cylinder and place on top of the Spring
(35).
vii. Screw Cylinder (25) down. Torque the Cylinder to that specified in Para 5.
viii. Insert Plug (39) and lock with Screw (100).
4.3.8.4
Change Bearing (11)
i. Using a press, move the Eccentric out of the Bearing (11), Ensuring that the lip on the
Eccentric is furthest away from the press ram.
ii. Fit new Bearing (11).
4.3.8.5
Change Oil Seal
i. Remove old Oil Seal (81).
ii. Fit new Oil Seal (81), ensuring that the flat side of the Oil Seal is facing the outside of
the pump, and taking care not to damage the lip of the Seal.
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