The Utile Engineering Co. Ltd.
27/11/03
Irthlingborough, Northamptonshire. England
Tel: +44 (0) 1933 650216
Fax: +44 (0) 1933 652738
12
IC162
2.
Blade Inspection
When carrying out any maintenance and inspections always follow the health and safety guidelines on page 4.
Ensure all electric circuits are isolated and cannot be switched on, and that the pipeline system has been cleared
and is pressurised to atmospheric pressure. Fully trained and competent service personnel must carry out any
maintenance work.
Inspection commences with the dismantling of the drive end. For ease of working, and not to cause strain to the
machine, it is best to remove the 4-way valve assembly, non return valve, ballast valve assembly and any oil pipes
and turn the machine upside down onto its flanges, so that the rotor at the lowest position
2.1
Remove guard (9), slip off timing belt (61), drive pulley and bush (58 & 60). Slacken clamp screw (27) in
support plate (8) and remove complete with oil pump assembly.
2.2
Undo four screws (24) and remove end cap (3) complete with two shaft seals (17).
2.3
Remove six bolts (25), washers and tap off coverplate (2) complete with outer race of roller bearing (15).
2.4
Measure and note the thickness of the gasket (54) fitted between the cylinder (1) and coverplate (2).
2.5
The blades (5) can now be removed form their slots for inspection.
Check blades for lamination, chipping or charring on their rubbing edges and for concave wear. For any
wear other than polished surfaces or if the blade depth has reduced to 83mm or below then replace blades.
When replacing blades a complete set must be replaced. The old blades must be disposed of according to
the local government laws. When fitting new blades, make sure they slide freely in their slots and if
necessary remove high spots with fine emery cloth. Lightly smear oil on blade surfaces before reassembly.
2.6
Inspect the visible part of the cylinder bore and rotor for any signs of excessive wear or scuffing and for
excessive slot wear. If there is any sign of cylinder rubbing completely dismantle the machine. Factory
reconditioning is recommended, but if work has to be carried out on site, we advise you most strongly to
contact Utile Engineering Service Department for advice.
During inspection, determine if the correct oil is being used. Bearings, cylinder wall, rotor/shaft assembly
and blades should show a polished surface with a light film of oil. Hard baked deposits indicate inferior oil,
dirt or excessive temperature.
3.
Reassembly after Blade Inspection
Reassemble in the reverse order, taking note of the following points: -
3.1
Ensure the blades are orientated correctly in their slots.
3.2
If coverplate gaskets have 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.
3.3
Replace coverplate assembly, shakeproof washers, screws, end cap oil pump support plate, pulley and
belt. Check that the shaft rotates freely by hand before refitting oil pipes. Prime oil pipes before use.
4.
Cylinder Renewal
With the drive end coverplate (2) already removed as described in 2 for blade inspection and with the cylinder
turned upside down , the next stage is to withdraw the rotor complete with the rear end coverplate (2).
4.1
Remove any oil pipes connected to the rear end. Remove three screws (26) and remove fancowl assembly
(21), loosen the set screw in the fan and remove fan (20).
4.2
Undo six screws (25), shakeproof washers and slide off the coverplate (2) complete with the rotor.
4.3
Measure and note the thickness of the gasket (54) fitted between the cylinder (1) and coverplate (2).
The cylinder can now be replaced or rebored.
4.4
When reboring the cylinder the maximum allowable increase in diameter is 0.8mm to give a final bore of
254.80mm. Contact Utile Engineering for appropriate assembly instructions in this case.
5.
Removal of Bearings and Seals
With the drive end coverplate (2) already removed as described in 2 for blade inspection.
5.1
Remove circlip (19) from its groove then slip off bearing retaining washer (7) then using a two-leg pulley
drawer the roller bearing inner race (15) can be removed from the shaft.
5.2
The shaft seals (17) and roller bearing outer race (15) can be pressed out of the end cap and coverplate for
inspection.
Blade Inspection, Reassembly after
Blade Inspection, Cylinder Renewal,
Change Bearings and Seals
Reassembly Procedure
