Atlas Copco LTD 28 R8-RE Produktanweisungen Seite 5

LTD28 R-RE
Installation proposal
Choosing the correct couplings, hose and clamps can be a troublesome digging into details. To save your
time and to ensure correct capacity of the airline installation, from the tapping point to the tool, we offer
you an installation proposal.
For more information please read, Atlas Copco Industrial Power Tools catalogue Ordering No. 9837 3000
01.
Handling
Tightening torque
For accurate operation and safety, the tightening torque of the nut runner must be set correctly in relation
to the screw joint. Check the tightening torque given to the joint in question.
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.
Reaction bar
Adapt and use the torque reaction bar (see figure in Service instructions) as follows:
1 Shaping the reaction bar
The torque reaction bar must be shaped to fit a suitable fixed support. To avoid overloading of the bear-
ings for the tool drive and of the reaction bar, the point of contact on the reaction bar should be
within the shaded area (F), see Fig. A.
■
Draw a line (B – E) at right angles (90
ing at point (B), draw two lines at angles of +15
■
Mark the area (F) between the drawn lines.
■
Adapt the shape of the reaction bar so that the point of contact (K) falls within the marked area (F).
The minimum breaking force is obtained if the point of contact (K) is on or close to line (B –
E).
■
If the point of contact falls within angle (α) – in area (G) – there is a risk of overloading of the bearings
for the machine drive and deformation of the reaction bar.
■
If the point of contact is outside angles ± 15
hexagon sleeve and reduced torque accuracy.
2 Bending
■
Aluminum torque reaction bar: The inner radius must not be smaller then 25 mm after bending.
■
Steel torque reaction bar: Heat the spot to red colour. After bending, allow to cool slightly in room
temperature and then chill.
EN
o
) to the centre line (A – C) of the machine from point (B). Start-
o
and -15
o
– in areas (H) – there is a risk of rapid wear of the
© Atlas Copco Industrial Technique AB - 9836 9411 06
Safety and operating instructions
o
respectively from the marked 90
o
-line.
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