WinGD WARTSILA RT-flex58T-D, Maintenance Manual

Page: 284 / 498

Maintenance
4103 − 1/A1
RT-flex58T-D
Winterthur Gas & Diesel Ltd.
2/ 2
3.3 Measuring tooth backlash with lead wire
D Use a fresh piece of lead wire Pb 99.9 fine of
1.5 mm diameter for each measurement.
D Always use lead wires of the same diameter
and quality.
⇒ Place lead wire pieces a, b, c of about 200 mm
length around the tooth profile and attach
them with scotch tape (see Fig. ’A’ and ’B’).
⇒
Number the tooth profiles in accordance with
Fig. ’B’.
⇒ Turn the lead wires only once through the
teeth meshing.
D Lead wire ’c’ (Fig. ’A’) serves to verify total
tooth backlash ’f’ (Fig. ’C’).
With lead wires ’a’ and ’b’ (Fig. ’A’) the tooth
profile parallelity is checked.
D
Total tooth backlash ’f’ (Fig. ’C’) composes of
f
1
and f
2
(thickness of lead wire):
f = f
1
+ f
2
.
D Obliquity ’ D f’ is calculated from the difference
in thickness of the squashed lead wires along
driving flanks TF (Fig. ’A’):
D f = a
1
− b
1
or a
3
− b
3
etc.
D The admissible deviation of tooth profile pa-
rallelity amounts to max. 0.2
o
/
oo
across the
width of the tooth.
4. Checking the running performance
To enable judging the running performance of
the gear train after re-commissioning, three
teeth each of the gear wheels are smeared
with a thin coat of oil resisting marking blue
(ink) equally spread. This check is necessary
in order to verify the mating appearance of the
teeth.
One brand of oil resisting marking blue is, for
example, Dykem Layout Red Dx-296.
LEAD WIRE Ø 1.5 mm
a
1
a
3
7
a
c
b
0
1
2
3
4
5
6
...
...
...
TF
c
A
B
C
15 mm
15 mm
=
=
b
1
b
3
f
1
f
2
000.653/93
000.653/93
000.653/93
2013
Checking the Running and Backlash Clearances and Condition of Teeth