HARBEN CENTURY, Service Manual

Page: 56 / 83

Flowplant Century Pump Manual
4.3.5 Removal and Inspection of Delivery Valves
– 8 Cylinder Pumps with Split
Delivery Manifold
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 (106 - not shown on drawings).
ii. Lift off Washers (90 - not shown on drawings)
iii. Delivery Tubes (19 - not shown on drawings) and Banjos (22 and 23) can
now be pulled off.
iv. Unscrew and remove the four Nuts (107 - not shown on drawings).
v. Lift off Washers (91- not shown on drawings).
vi. The second set of Delivery Tubes and Banjos can now be pulled off.
vii. Unscrew and remove Delivery Nuts (50 and 51) containing the Valve
Assembly.
viii. Insert a flat blade screwdriver into the radial groove of Delivery Seat (45)
and levering gently around, ease Seat from Delivery Nut (50 and 51)
ix. Remove the Guide (48) and Ball (47) from Delivery Nut (50 and 51).
x. Inspect the Ball (47) and Seat (45). If either is badly pitted, chipped or
unevenly worn, it must be replaced.
xi. Inspect bore of Guide (48). Replace item if it is badly pitted, chipped or
unevenly worn.
xii. Fit the Seat (45) into the Delivery Nut (50 and 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.
xiii.
Grease the threads of the Delivery Nuts (50 and 51) before assembly.
xiv. Re-fit the Valve Assembly to the unit reversing the removal procedure
given in Sub-paras (7) 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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