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LUM12 HRF
The tightening torque is adjusted by altering the tension of the clutch spring. Turn the protection ring until
the hole in the clutch housing is free. Then turn the out going spindle until you can see the keyhole in the
adjustment washer. Turn the adjustment key clockwise to decrease and anticlockwise to increase the
torque. After the adjustment, turn the protective ring back again.
Verification of tightening torque
Atlas Copco Torque Analyser, ACTA 3000, plus an appropriately-sized in-line transducer, IRTT together
with the available test joints are recommended equipment.
Torque range of the clutch springs :
Each clutch spring gives a certain torque range. Don't adjust the torque over the maximum recom-
mendation as that might result in improper function and faster wear of the clutch.
The torque range of each spring is easily identified by it's colour.
Maintenance
For maximum performance
At tough working conditions – soft joints and max. setting – lubrication of the air is recommended.
With extreme dry air the service life of vanes and machine performance might be reduced. A daily supply
of 0.1 – 0.2 ml oil into the machine inlet will improve the machine performance. Alternatively consider an
automatic lubricator device, Atlas Copco oil fog lubricator DIM, or single point lubricator DOS, which will
improve the machine performance.
Rust protection and internal cleaning
Water in the compressed air, dust and wear particles cause rust and sticking of vanes, valves etc. An air
filter should be installed close to the machine (se 'Air quality'). Before longer standstills, flush with oil
(some drops) into the air inlet, run the machine for 5-10 seconds when absorbing the oil in a cloth.
Service instructions
Overhaul and preventive maintenance is recommended at regular intervals once per year or after maxi-
mum 250.000 tightening depending on which occurs sooner. More frequent overhaul may be needed, if
used at high torque and long tightening times. If the machine is not working properly, it should immediately
be taken away for inspection.
The strainer at the air inlet and the exhaust silencer should be cleaned frequently or replaced in order to
prevent clogging, which decreases the capacity.
At the overhauls, all parts should be cleaned accurately and defective or worn parts (i.e. O-rings, vanes)
should be replaced.
Disassembling /assembling
It is important that the machines threaded connections are tightened properly; i.e. in accordance with the
specifications on the exploded views.
Cleaning
Clean all parts thoroughly in white spirit or similar cleaning agent. To prevent clogging and decreased
power, it could be necessary to clean the strainer (if used) and the exhaust filter between the overhauls.
Inspection
After the cleaning, inspect all parts. Damaged and worn parts should be replaced.
Lubrication
Lubricate specially gears, valve and clutch with grease containing molybdenum disulphide (e.g. Molykote
BR2 Plus). Lubricate o-rings and threaded connections with grease before assembling.
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© Atlas Copco Industrial Technique AB - 9836 9378 00
Safety and operating instructions
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