Installation of gear reducer
5
Incorrect
Correct
UT
.C. 2437
Generally, it is recommended to machine the hole of parts keyed onto shaft end, tolerance
H7
.
For low speed shaft ends, provided that load is not uniform and light, tolerance must be
K7
.
Before mounting, thoroughly clean mating surfaces with proper antirust products, and lubricate against seizure and fretting
corrosion.
Attention!
Assemble and disassemble with the aid of
jacking screws
and
pullers
using tapped holes at shaft butt-end, taking
care to avoid impacts and shocks which may
irremediably damage the bearings, the circlips or other parts.
For couplings H7/m6 and K7/j6 it is advisable that the part to be keyed is preheated to a temperature of 80 ÷ 100 °C.
The couplings having a tip speed on external diameter up to 20 m/s must be statically balanced; for higher tip speeds they must
be dynamically balanced.
Where the transmission link between gear reducer and machine or motor generates shaft end loads, ensure that: loads do not
rise above catalog values:
•
loads do not rise above catalog values;
•
transmission overhang is kept to a minimum;
•
drive-chains should not be tensioned (if necessary – alternating loads and/or motion – foresee suitable chain tighteners);
•
in the gear transmission systems there is a proper backlash (≈ 0,03 ÷ 0,04 mm) between pinion and rack;
•
drive-belts should not be over-tensioned.
18
UT.D 208-2021.12-EN
