Winterthur Gas X40-B, Maintenance Manual

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Maintenance
4104 − 1/A1
Winterthur Gas & Diesel Ltd.
2/ 3
3. Gear Tooth Backlash
Checks
Refer to 0330 − 1, Driving Wheels for Supply
Unit, Group 4104 for data about the gear tooth
backlash values.
There are three procedures to measure the
backlash.
3.1 Feeler gauge (94122)
1) Measure the clearance between the
tooth flanks (10, Fig. 1 ). Do this
procedure at a minimum of four
positions around the circumference of
the gear wheel.
3.2 Dial gauge
1) Put the dial gage in a position where
you can read the backlash value when
the gear wheel moves.
2) Make sure that the drive wheel does
not move.
3) Use the turning gear to carefully move
the gear wheel a sufficient distance.
4) Measure the backlash when one tooth
of the gear wheel moves between the
profiles of two gear wheel teeth.
3.3 Lead wire
Note: Use a new lead wire of 1.5 mm
diameter (Pb 9.99 fine) for each
measurement.
1) Attach three lengths of lead wire
(approximately 200 mm) in the
positions shown with Scotch tape.
2) Put marks (0 to 9) on the tooth
profiles (7) as shown.
3) Operate the turning gear to turn the
gear wheel so that the lead wire goes
once through the teeth of the gear
wheel and drive wheel.
The lead wire (c) shows the full backlash (f).
The lead wires (a) and (b) show the parallelity
of the tooth profile.
The obliquity
D
f is the difference between the
values of the wires on the drive flanks 10
between e.g. a1 − b1.
4) Remove the lead wire.
2016
Running and Backlash Clearances and Tooth Condition
Fig. 1
10
c
f
1
f
2
000.653/93
Gear Wheel
a
1
a
3
7
a
c
b
15 mm
15 mm
b
1
b
3
000.653/93
Equal Distances
0
1
2
3
4
5
6
7
8
9
000.653/93
Lead Wire Ø 1.5 mm