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Operating manual X9 Series metering pumps

Figure 19 LN, LP PUMPS: KNOB ADJUSTMENT FRICTION SETTING

8.5 BEARINGS REPLACEMENT

Replace the bearings according to actual pump operating conditions:

• every 20.000 operating hours, for continuous works at maximum performance

• every 40.000 operating hours, for discontinuous works under less severe conditions

To mount the new bearings it is advisable to use a proper sleeve exerting pressure on the coupling ring. In case of shaft coupling, place

and support the sleeve on the internal bearing ring. For coupling on the hole, put pressure instead on the outer ring. Make sure the

surfaces of the relative seats are lightly oiled to help fitting.

8.5.1

Reassembling

Before reassembling carefully clean internal parts and all components, ensuring above all that seals working surfaces have not been

damaged. Pay particular attention while reassembling oil containment seals, especially taking care to preserve the integrity of the seal

lips. Restore where needed the layer of grease on the contact surfaces, then proceed with reassembly.

Before restarting the pump, turn the motor fan with a screwdriver, in order to verify the pump mechanism free

movement so to have a confirm of the correct reassembling.

8.6 CHANGE OF INTERNAL SAFETY VALVE SET PRESSURE

The set pressure value of the internal safety valve (PSV) is indicated on the pump nameplate, see "Identification nameplate".

AVOID as much as possible his changing. When this operation is required, however, it must be performed only by expert, qualified

maintenance engineers with highly specialised knowledge. Without said expertise avoid impromptu operations or attempts.

ATTENTION: OBL declines all responsibility for any damage caused by modifications on or tampering with the

PSV by non-authorised users. Before operating on the PSV, contact OBL customer service to define new limits of use

that will be guaranteed only after a new nameplates fixed to the pump.

ATTENTION: The internal safety valve is setted and sealed by OBL at the end of final testing. Do not remove

the seal, do not dismantle the PSV, do not tamper with or, worse, operate directly on the internal components. These

actions could compromise the safety of the plant and of personnel and will also void the guarantee.

If modifying PSV set pressure is required and necessary, contact OBL customer service (Tel. +39-02-26919.1, info@obl.it) stating the

following:

- type of metering pump (complete model number)

- metering pump serial number or OBL job n° (as an alternative to the serial number)

- the actual PSV set pressure value (indicated on metering pump nameplate)

OBL X9 Series User Manual

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