HARBEN CENTURY, Service Manual

Page: 55 / 83

Flowplant Century Pump Manual
4.3.4 Removal and Inspection of Delivery Valves
– 8 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 Banjo Bolts (57 and 58) with Bonded Seal (65).
ii. Pull off Delivery Tubes (18) and Banjos (20 and 21). Recover the Bonded
Seals (65) from between the Banjos and delivery Nuts.
NOTE Delivery Tubes are shown on Fig 1.1 (Section 1) linking each of the
Barrels, via the Banjos.
iii. Unscrew and remove Delivery Nut (51) containing the Valve Assembly.
iv. Place a nylon drift (part no 061-045) through the female threaded end of the
Delivery Nut until it touches the bottom of Guide (48), Tap the end of the Drift
gently until the Guide pushes the Seat (45) out from the recess in the Delivery
Nut
Note: If difficulty is experienced and the Valve Assembly is not completely
removed, use a flat blade screwdriver in the radial groove of the Delivery Seat
(45) and gently ease the Seat from the Delivery Nut. Guide (48) and Ball
(47) can now be removed.
v. Inspect the Ball (47) and Seat (45). If either is badly pitted, chipped or
unevenly worn, it must be replaced.
vi. Inspect bore of Guide (48). Replace item if it is badly pitted, chipped or
unevenly worn.
vii. 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.
viii. Grease the threads of the Banjo Bolts (57 and 58) and Delivery Nut (49)
before re-assembly.
ix. Re-fit the Valve Assembly to the unit reversing the removal procedure given in
Sub-paras iii to i 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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