PROCEDURE
1 Measure the gear tooth backlash with one of the procedures that follows:
NOTE: For data about the gear tooth backlash values, refer to 3.3 Clearances -
general.
NOTE: There are three procedures to measure the backlash.
2 Measure the clearance between the tooth flanks (001, Figure 9-1) with a feeler gauge.
Do this procedure at a minimum of four positions around the circumference of the gear
wheel.
3 Measure the gear tooth backlash with a dial gauge as follows:
3.1 Put the dial gauge in a position where you can read the backlash value when the
gear wheel (003) moves.
3.2 Make sure that the drive wheel (003) does not move.
3.3 Operate the turning gear to carefully move the gear wheel (003) a sufficient
distance.
3.4 Measure the backlash when one tooth of the gear wheel (003) moves between
the profiles of two gear wheel teeth.
4 Measure the gear tooth backlash with a wire as follows:
NOTE: Use a new wire of 1.5 mm diameter (Pb 9.99 fine) for each measurement.
NOTE: The wire (c) shows the full backlash (f). The wires (a) and (b) show the
parallelity of the tooth profile.
NOTE: The obliquity Δf is the difference between the values of the wires on the tooth
flanks between for example a1 − b1.
4.1 Attach three lengths of wire (approximately 200 mm) in the positions shown with
Scotch tape.
4.2 Put marks (0 to 9) on the tooth profiles as shown.
4.3 Use the turning gear to turn the gear wheel (003) so that the wire (004) goes
once through the teeth of the gear wheel and drive wheel (002).
4.4 Remove the wire (004).
4.5 Use the micrometer to measure the wire (004).
4.6 Calculate as follows:
•
The full tooth backlash: f = f1 + f2
•
The obliquity: Δf = a1 − b1 or a3 − b3.
NOTE: The permitted difference of the tooth profile parallelity is between 0.0%
and 0.2% across the width of the tooth.
X72DF
AA00-4106-00AAA-360A-A
Maintenance Manual Gear wheel crankshaft - do a check of the teeth backlash
Winterthur Gas & Diesel Ltd.
- 513 - Issue 002 2020-10
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