Utile L240 - Reassembly Procedure

The Utile Engineering Co. Ltd. 29/06/05
Irthlingborough, Northamptonshire. England
Tel: +44 (0) 1933 650216
Fax: +44 (0) 1933 652738 13 IC129
5.4 Inspect the bearing, renew if it shows any signs of wear or pitting.
5.5 Examine the shaft and bearing seals (22 & 40) and renew if the wiping lips are worn or damaged.
With the drive end coverplate (2) already removed complete with rotor as described in 4 for cylinder renewal.
5.6 Undo four screws (42) and take off end cap (4) complete with shaft seals (22).
5.7 Remove the circlip (37) from its groove then slip off the bearing retaining washer (23).
5.8 Using a two-leg pulley drawer pull the coverplate assembly complete with roller bearing (18) and bearing
seal (40) from the rotor/shaft assembly (5).
5.9 The shaft seals (22) and roller bearing (18) and bearing seal (40) can be pressed out of the end cap and
coverplate for inspection.
5.10 Examine the shaft and bearing seals (22 & 40) and renew if the wiping lips are worn or damaged. Inspect
the bearing, renew if it shows any signs of wear or pitting.
6. Reassembly Procedure
This section only applies when using original bore size or replacement cylinder. Before commencing reassembly
ensure that all components are perfectly clean and oilways are clear. Lightly smear the shaft with oil to assist
assembly.
The correct clearances for these machines are: -
L240 L320
Drive End Coverplate / Rotor 0.30mm / 0.35mm 0.33mm / 0.38mm
Rear End Coverplate / Rotor 0.08mm / 0.10mm 0.08mm / 0.10mm
Rotor / Cylinder 0.10mm / 0.13mm 0.10mm / 0.13mm
Reassembly should start with the preparing of the rotor and shaft assembly by the fitting of the replacement seal
sleeve (if required) and the inner races of both the roller bearings.
6.1 The spacing rings (7) are retained on the clean shaft using LOCTITE 648 adhesive or equivalent, and
should be pushed hard against the rotor face. It is essential that the width of the spacing rings is identical to
the one it is replacing or internal clearances may be effected causing serious machine damage.
6.2 Both roller bearing inner races can now be fitted onto the shaft, ensure the bearings and any shims are
fitted to the correct ends.
Starting at the drive end
6.3 Position the bearing seal (40) into position in the coverplate (2) ensuring that the tension spring is facing
the rotor for blowers and natural gas compressors and away from the rotor for vacuum pumps.
6.4 Press the outer race of roller bearing (18) into position in the coverplate (2).
6.5 Lay the rotor/shaft assembly on the bottom of the cylinder (1), ensure the cylinder is orientated correctly.
6.6 Ease coverplate (2) onto the rotor/shaft.
6.7 The whole bearing assembly can be secured onto the shaft with the bearing retaining washer (23) and the
circlip (37). Set clearance.
6.8 Press the shaft seal (22) into the end cap (4) with the tension spring facing the rotor.
6.9 The end cap (4) can now be fitted with the gasket (53) and any appropriate shims.
6.10 Fit new o-rings (20) into the coverplate grooves. If coverplate gasket (54) has been replaced, it is essential
that they are the same thickness as the originals, otherwise internal clearances will be affected and could
cause serious damage. Lightly smear the gasket with oil before replacing.
6.11 Place drive coverplate assembly onto cylinder (1) via location dowel and bolt with six screws (43) and with
coverplate gaskets (54) in place.
6.12 Check rotor / cylinder clearance.
Change Bearings and Seals,
Reassembly Procedure