WinGD RT-flex50DF, Maintenance Manual, Page: 342 / 586

Maintenance
4103 − 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
backflash.
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) Operate 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) each time
you measure the backlash.
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) Operate the turning gear to move the
gear wheel. Make sure 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
(1) between e.g. a1 − b1.
4) Remove the lead wire.
Running and Backlash Clearances and Tooth Condition
2016
a1
a3
10
15 mm
15 mm
b1
b3
Equal Distances
a
b
c
WCH02402
Drive Wheel
Gear Wheel
f2
f1
10
c
WCH02402
Fig. 1
0
1
2
3
4
5
6
7
8
9
WCH02402
Lead Wire