Safety Information LTV38 R..TS/..TAS
6© Atlas Copco Industrial Technique AB - 9836 1857 00
Calibration procedure (using 2 x
FOCUS and IRTT)
1. Connect the machine transducer to Focus No. 1
and a dead weight calibrated IRTT to Focus
No. 2.
2. Set the filter frequency response to 500 Hz in
both Focus units.
3. Adjust Focus No. 1 to the engraved calibration
value for this machine and Focus No. 2 to the
correct calibration value for the IRTT.
4. Make a few tightening on a soft joint (360o)
and on maximum nominal torque. If needed,
adjust the calibration value of the machine (Fo-
cus No.1) until the resulting torque values cor-
respond roughly.
5. Clear both Focus units from data. Make 10
tightening and compare the mean values. If the
difference between the two mean values are
within limits, 1% of maximum nominal torque
of machine, go to 6. If not, calculate a new cali-
bration value and repeat. Formula: New cal.
value = (Average Focus 2 / Average Focus 1)
x Old cal. value
6. Make another 10 tightening at half the nominal
torque and compare the mean values. Note,
same limits, 1% of maximum nominal torque.
7. When both the tightening sequences are ap-
proved read the calibration value on Focus No.
1. Engrave this value on the machine.
It is important that the machine, the IRTT and
the test joint are aligned, use preferably a fix-
ture holding the machine. Even small mis-
alignments can affect the result.
If the machine is intended for a certain joint you
need only to make the calibration on the torque
value for this joint. Preferably on the actual joint.
When calibrating used machines the limits are the
same, but scatter and range will increase with in-
creased wear.
Maintenance
For maximum performance
It is important to lubricate regularly to get maxi-
mum performance and trouble-free operation. The
motor should be lubricated with oil; i.e. drops of
oil can be dropped either into the compressed air
or directly into the air inlet.
The trigger, planetary gears, needle bearings and
ball bearings should be lubricated with grease dur-
ing the regular overhaul of the machine.
The angle gear and clutch must be lubricated using
grease that contains molybdenum disulphide:
Molykote BR2 Plus, for example, or an equivalent
brand.
Use lubricants of good quality. The oils and
greases mentioned in the table are examples of lu-
bricants which are recommended.
Rust protection and internal cleaning
Water in the compressed air, dust and wear parti-
cles cause rust and sticking of vanes, valves etc.
An air filter should be installed close to the ma-
chine (see ‘Air quality’).
Service instructions
Overhaul and preventive maintenance is recom-
mended at regular intervals once per year or after
maximum 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 not is 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 accu-
rately and defective or worn parts (i.e. O-rings,
vanes) should be replaced.
Disassembling / assembling
It is important that the machines threaded connec-
tions are tightened properly; i.e. in accordance
with the specifications on the exploded views.
Lubricate o-rings and threaded connections
with grease before assembling.
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 over-
hauls.
Inspection
After the cleaning, inspect all parts. Damaged and
worn parts should be replaced.
