GAS COMPRESSORS / BOOSTERS
GAS & AIR MIXING SYSTEMS
AIR BLOWERS & VACUUM PUMPS
The Utile Engineering Co. Ltd.
Irthlingborough, Northamptonshire, NN9 5UG, ENGLAND
Telephone: + 44 (0) 1933 650216 Facsimile: + 44 (0) 1933 652738 Email: sales@utileengineering.com
www.utileengineering.com
12
IC182
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 rear end, after removal of the oil tank and pipes.
2.1
Remove three screws (32) and remove fancowl (11) loosen the set screw in fan and remove fan (10).
2.2
Undo four screws (31) and take off end cap (5) complete with mechanical seal seat (20). Inspect the faces of the
mechanical seal for wear and replace complete seal if either are worn. Remove the mechanical seal (20) taking
care not to damage the carbon face. If the seal is stuck on the shaft, carefully prise free with a screwdriver
between the locating ring and the locknut (28).
2.3
Remove the locknut (28). Do not loose the bearing flange.
2.4
Remove six bolts (30) and withdraw coverplate (3) complete with outer race of bearing (23) and seal (21).
2.5
Measure and note the thickness of the gasket (49) fitted between the cylinder (1) and coverplate (3).
2.6
The blades (7) can now be removed form their slots for inspection.
Check the blades for lamination, chipping or charring on their rubbing edges and for concave wear. For any other
wear other than polished surfaces or if the blade depth has reduced to 67mm or below then replace the 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, ensure they slide freely in their slots and if necessary remove high
spots with fine emery cloth. Lightly smear blade surfaces with oil before reassembly.
2.7
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, screws, locknut and tab washer, mechanical seal, end cap, fan and fancowl. Before
reconnecting oil pipes ensure they are primed.
4.
Cylinder Renewal
With the rear end coverplate (3) already removed as described in 2 for blade inspection, the next stage is to withdraw the
rotor complete with the drive end coverplate (2).
4.1
Take off timing belt (51), drive pulley (48). Slacken clamp screw (34) in support plate (12) and remove complete
with oil pump assembly.
4.2
Undo four screws (31) and take off end cap (4) complete with mechanical seal seat (20). Inspect the faces of the
mechanical seal for wear and replace complete seal if either are worn. Remove the mechanical seal (20) taking
care not to damage the carbon face. If the seal is stuck on the shaft, carefully prise free with a screwdriver
between the locating ring and the locknut (28).
4.3
Remove the locknut (28).
4.4
Remove six bolts (30) and withdraw coverplate assembly (2) complete with rotor assembly. Measure and note the
thickness of the gasket (44) fitted between the cylinder (1) and coverplate (2). The cylinder can now be replaced
or rebored.
4.5
When reboring the cylinder the maximum allowable increase in diameter is 0.8mm to give a final bore of
185.00mm. Contact Utile Engineering for appropriate assembly instructions in this case.
Blade Inspection,
Reassembly after Blade Inspection,
Cylinder Renewal,
