HARBEN CENTURY, Service Manual

Page: 53 / 83

Flowplant Century Pump Manual
4.3 PUMP OVERHALL PROCEDURES
4.3.1 Introduction
During the pump overhaul procedures, reference should be made to the pump
component and assembly drawings (Figs 4.1 to 4.6), which include associated parts
lists, Also included are assembly drawings of the Mk 2 selector and safety relief
valve (Figs 4.7 and 4.8).
In the following overhaul procedures, the item number that follows the description of
a part refers to the assembly drawings (Figs 4.1 and 4.3 to 4.6).
4.3.2 Removal and Replacement of Pump Head
Note: Refer to 4.3.1 for drawing information.
Carry out a removal and replacement of the Pump Head, as follows:
i. Switch off and isolate the prime mover.
ii. Switch off or disconnect the water mains supply to the tank.
iii. Drain the water tank.
iv. Disconnect the water inlet hose to the pump.
v. Disconnect the small bleed hose at the top of the Inlet Manifold, if fitted.
vi. Disconnect the high pressure hose from the Delivery Manifold.
vii. Drain water from the Inlet Manifold.
viii. Disconnect the hose snap coupling from the top of the Crankcase to Oil
Expansion Bottle.
ix. Remove the hose from the top of the Crankcase, and replace with a Lifting
Eye (114).
x. Connect lifting tackle to the Lifting Eye. Do not take the weight of the
pump, leave only slack cable.
xi. Remove the bolts from the bell housing, and pull off pump and bell
housing.
Note: If an adaptor ring is fitted, it is usually best to leave it attached to the
prime mover.
xii. Before replacing the pump, check the drive coupling stand-off distance.
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