Maintenance4103−1/A1
Winterthur Gas & Diesel Ltd.
2/ 3
3. Gear tooth backlash
checks
Refer to 0330−1, Driving Wheels for Supply
Unit (Group 4103) for data about the gear
tooth backlash values.
There are three procedures to measure the
backlash.
3.1 Feeler gage (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 gauge 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
as shown.
3) Use 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 Df is the difference between the
values of the wires on the drive flanks 10
between e.g. a1 − b1.
4) Remove the lead wire.
2015
Running and Backlash Clearances and Tooth Condition
a1
a3
7
15 mm
15 mm
b1
b3
Equal Distances
a
b
c
WCH02402
0
1
2
3
4
5
6
7
8
9
Drive Wheel
Gear Wheel
f2
f1
10
c
WCH02402
WCH02402
Lead Wire
Fig. 1
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