Multitech 1777.8/7-10 G3 operating instructions Fixed bearing, MTC 100/125/150

Page 24

If there is no suitable torque wrench available for tightening the shaft nuts, proceed as follows, depending on the pump version:

Self-locking nut on drive end (or non-drive end on versions C und D)

GTighten the shaft nut firmly

GLoosen the shaft nut again

GApply thread-locking agent to the thread (e.g. LOCTITE)

GModerately tighten the shaft nut

Nut with lockwasher on drive end (or non-drive end on versions C und D)

GTighten the shaft nut firmly

GLoosen the shaft nut again

GModerately tighten the shaft nut

GBend over lockwasher

Nut with locknut on drive end (or non-drive end on versions C und D)

GTighten the first shaft nut firmly

GLoosen the first shaft nut again

GModerately tighten the first shaft nut

GBlock the first shaft nut with a suitable tool and tighten the locknut firmly against the first shaft nut

Nut with locknut on non-drive end (all versions except C and D)

GModerately tighten the first shaft nut

GBlock the first shaft nut with a suitable tool and tighten the locknut firmly against the first shaft nut

Fixed bearing

The fixed bearing is the coupling-side bearing at the coupling end. Pump size 32 is equipped with deep-groove ball bearings. The other pump sizes are fitted with angular contact ball bearings in X arrangement (see sectional drawing).

The spacer discs 551.1 serve to position the rotor in axial direction.

Axial adjustment of the rotor is not required. The correct axial position of the rotor is achieved by inserting spacer discs 551.1 to a total thickness of 1.6 mm (1 x 1 mm + 3 x 0.2 mm) in bearing housing 350.1 on the side of the bearing (or angular contact ball bearings).

Caution

On the old versions, the rotor is axially positioned

 

by inserting spacer discs 551.1 on both sides of

the bearing (or angular contact ball bearings) to a total thickness of 1.6 mm each.

Cover bolts 901.1 (or 901.8 for oil-lubricated bearings) must be tightened in diagonally opposite sequence to the following torques:

MTC 32/50/65 :

30 Nm

MTC 100/125/150 :

40 Nm

24

Multitec

After installation of the bearings, the following checks shall be made:

-Grease-lubricated bearings: Check the clearance between cover 360.1 and bearing housing 350.1 after having tightened bolts 901.1. There should be a clearance between 0.2 mm and 0.8 mm. Cover 360.1 must not rest on the bearing housing 350.1.

-Oil lubricated bearings: Check the clearance between cover 360.2 and bearing housing 350.1 by verifying the dimensions prior to re-assembly (if bearings or cover have to be replaced).

Rolling element bearing sizes

Grease-lubricated bearings

0.2 ...0.8 mm

Fig. 40

Pump size

Fixed bearing 320.1

Radial bearing 320.2

32

6309 ZZ C3-HT

6309 ZZ C3-HT

50

2 x 7309 BUA

6309 ZZ C3-HT

65

2 x 7309 BUA

6309 ZZ C3-HT

100

2 x 7312 BUA

6312 C3

125

2 x 7312 BUA

6312 C3

150

2 x 7315 BUA

6315 C3

Oil lubricated bearings 0.2... 0.8 mm

Fig. 41

The same rolling element bearings are installed for oil lubrication as for grease lubrication.

Exception: Instead of bearing type 6309 ZZ C3-HT, rolling element bearing type 6309C3 is used for oil lubrication.

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Contents High-pressure pumps in ring-section design Operating instructions 1777.8/7-10 G3Works No Type series Multitec Contents Section Adjusting dimensions for coupling Multitec IndexSafety Multitec GeneralMultitec Transport, storageAccessories Description ProductMultitec Installation at site Foundation / Checks to be carried out prior to installationInstalling the pump/unit Close-coupled pumpsAligning the pump / drive Coupling guard Be tightened to the following torques Tightening torqueThread Strength Drive Non-drive End 100 120 NmConnecting the piping Max. permissible pipeline forces material codes 10, 11, 12Max. permissible pipeline forces material codes 20 to Protection against foreign matterConnection to power supply Setting the time relayVacuum balance line Checking the direction of rotationMultitec Commissioning, start-up / Shutdown Temperature of the fluid pumped Start-upShutdown Gland packingSwitching frequency Returning to service after storageMinimum flows Density of fluid pumpedMultitec Servicing / maintenance Bearings and lubricationGeneral instructions PumpOil quality / Oil change MotorShaft seal Mechanical seal CouplingDismantling the bearings Dismantling the non-drive-end bearings Plain bearingAxial suction nozzle Radial suction nozzleGrease lubrication figs Oil lubrication with lip seal figOil lubrication with labyrinth seal fig Grease lubricationReplacing the shaft protecting sleeve Removing a double-acting mechanical seal Reassembly Dismantling the hydraulic systemIntermediate bearing bush Intermediate bearing diffuser With the rules of sound engineering practiceReassembly of hydraulic system Stuffing box housingSeals Gland packing Mechanical seals Horizontal baseplate-mounted pump unitsSealing elements Leakage at the mechanical sealTightening the shaft nuts on Multitec pumps Fixed bearing MTC 100/125/150Rolling element bearing sizes Grease-lubricated bearings Temperature of the rolling element bearings Re-adjusting the clearance gaps Maximum clearance gapsInstallation and returning to service Radial bearingMultitec Trouble-shooting General assembly drawing Pump sizes 32 toClose-coupled pump up to pump size Radial suction nozzleVertical design Pump sizes 32, 50 Pump sizes 100, 125Pump sizes 125 List of components Description525.1/2/4 Spacer sleeve 529Achtung Attenzion BildKSB Aktiengesellschaft

1777.8/7-10 G3 specifications

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