HARBEN CENTURY, Service Manual

Page: 54 / 83

Flowplant Century Pump Manual
xiii. Replace the pump, generally reversing the removal procedure.
Note: before operating the pump, it may be necessary to bleed the pump
of air.
xiv. If the pump fitted is new or has been overhauled, carry out the running in
procedure detailed from
4.3.7.
4.3.3 Removal and Inspection of Delivery Valves
– 4 Cylinder Pumps
Notes: Oil need not be drained.
Refer to 4.3.1 for drawing information.
Carry out removal and inspection of Delivery Valves, as follows:
i. Unscrew and remove the four Nuts (107 - not shown on drawings).Lift off
Washers (91 - not shown on drawings).
ii. Delivery Tubes (19 - not shown on drawings) and Banjos (22 and 23) can now
be pulled off.
iii. Unscrew and remove Delivery Nut (51) containing the Valve Assembly.
iv. Insert a flat blade screwdriver into the radial groove of Delivery Seat (45) and
levering gently around, ease Seat from Delivery Nut (51)
v. Remove the Guide (48) and Ball (47) from Delivery Nut (51).
vi. Inspect the Ball (47) and Seat (45). If either is badly pitted, chipped or
unevenly worn, it must be replaced.
vii. Inspect bore of Guide (48). Replace item if it is badly pitted, chipped or
unevenly worn.
viii. Fit the Seat (45) into the Delivery Nut (51) using a small hand press. If a hand
press is not available, tap the Seat in with a nylon mallet, making sure that it
is tapped in squarely and no nylon from the mallet head goes into the Valve
Assembly through the Seat hole.
ix. Grease the threads of the Delivery Nut (51) before assembly.
x. Re-fit the Valve Assembly to the unit reversing the removal procedure given in
Sub-paras (4) to (1), in that order.
Note: Where possible, use a socket and torque wrench and torque the
Delivery
and Banjo Nuts to that specified in 4.2.3.
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