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UTD.187.2019.09.00_EN Operating instructions G series
In general, it is recommended to machine the hole of the parts keyed onto shaft end to H7 tolerance.
For high speed shaft end with D 55 mm, provided that load is uniform and light, tolerance can be G7.
For low speed shaft ends, provided that load is not uniform and light, tolerance must be K7.
Before mounting, thoroughly clean mating surfaces 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;
– 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.
For splined couplings apply adequate antirust-products.
5.12 - Backstop device
The presence on gear reducer of backstop device is stated by the arrow near the low speed shaft, indicating
the free rotation.
Provide a protection system where a backstop device breaking could cause personal injury or property damage.
Make sure that the direction of rotation in machine, gear reducer and motor all correspond correctly.
Attention! One or more startings in the false direction, even if short, could irremediably
damage the backstop device, the coupling seats and/or the electric motor.
Incorrect
Correct
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