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8.6 - Motor assembly/replacement
Since gearmotors are fitted with standard motors, motor
re placement – in case of failure – is extremely easy.
Simply observe the following instructions (after having observed the
safety instructions relevant to machine, see maintenance procedure
of ch. 8.1):
– be sure that motor's category complies with the zone where it
is used and the mating surfaces are machined under accuracy
rating (UNEL 13501-69; DIN 42955);
– clean surfaces to be fitted, thoroughly. If painted, remove paint;
– check and, if necessary, lower the parallel key so as to leave a
clearance of 0,1 0,2 mm between its top and the bottom of the
keyway of the hole. If shaft keyway is without end, lock the key
with a pin.
When the motor shaft end is keyed direct to worm or to cylindrical
or bevel pinion (gearmotors: worm MR V, parallel shaft MR 3I sizes
140 ... 360 and MR 2I, right angle shaft MR Cl and MR C2I):
– check that the fit-tolerance (push-fit) between hole and shaft end
is G7/j6 for D 28 mm, F7/k6 for D 38 mm;
– lubricate surfaces to be fitted against fretting corrosion.
Before disassembling motor sizes 200 ... 315 on MR 2I, 3I or ser-
vomotors (coupled with key and bronze bush with hub clamp)
and for gear reducer sizes 40 ... 81 design «square flange for
servomotors» proceed as follows:
– align tightening screw of hub clamp with the access hole;
– loosen the tightening screw and consequently the hub clamp;
– disassemble the motor.
When a cylindrical pinion is keyed onto the motor shaft end (gear-
motors: worm MR IV, 2IV; parallel shaft MR 3I sizes 50...125, MR 4I;
right angle shaft MR ICI, C3I; coaxial gearmotors):
– check that the fit-tolerance (standard locking) between hole and
shaft end is K6/j6 for D 28 mm, and J6/k6 for D 38 mm; key
length should be at least 0,9 pinion width;
– make sure that the motors have bearing location and overhang
(distance S) as shown in the following table;
Motor
Min dynamic load capacity
size
daN
Front
450
63
630
71
900
80
90
1 320
100
2 000
112
2 500
132
3 550
160
4 750
180
6 300
200
8 000
225
10 000
250
12 500
280
16 000
1) Values advised in order to minimize sound levels. These values refer to the maximum
power of motor size; proportionally they increase when the applied power decreases. They
can double accepting higher sound levels (3÷5 dB(A)). These values do not affect the
gearmotor compliance with ATEX directive.
– locate the spacer (with sealant, check that between keyway
and motor shaft shoulder there is a grounded cylindrical part of at
least 1,5 mm) and pinion on the motor (pinion pre-heated to +80
+100 °C) locking the entire assembly by means of a bolt to the
butt-end or hub clamp;
– grease the pinion teeth, the sealing ring rotary seating and the ring
itself, and assemble carefully.
groove for pulling
pinion
gea reducer
ROSSI
GEARMOTORS
32
Max dimension
'S'
1)
Rear
mm
335
16
475
18
670
20
1 000
22,5
1 500
25
1 900
28
2 650
33,5
3 350
37 ,5
4 500
40
5 600
45
7 100
47 ,5
9 000
53
11 200
56
motor
9 - Sound levels
Most of the ROSSI MOTORI-
DUTTORI product range is cha-
racterised by sound pressure
levels L ¯
(mean value of mea-
pA
surement, assuming nominal
load and input speed n
=
1
-1
1 400 min
, at 1 m from exter-
nal profile of gear reducer stan-
ding in free field on a reflecting
surface, according to ISO/CD
8579) lower or equal to 85
dB(A).
The table indicates the pro-
ducts which can exceed a.m.
threshold. For further infor-
mation about sound levels of
every single product see ROSSI
MO TORIDUTTORI
technical
catalogues.
UT.D 123 rev. 3
Gear reducer/train of gears
i
Size
N
Parallel shaft
R I
3,15 160
4
200
R 2I
all
320
R 3I
all
400
R 4I
160 500
200 630
all
320
Right angle shaft R CI
R C2I
63 400
71 500
R C3I
all
630
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