Inspecting Bevel Gear Backlash; Backlash Reading And Corresponding Adjusting Shim Sizes - TOHATSU TLDI 40 Service Manual

Inspecting Bevel Gear Backlash

Backlash Measuring Tool
Install the clamp assembly w on the drive shaft q.
Line up the tip of the dial gauge with center of the V
groove e on the clamp assembly.
q Drive shaft
w Clamp assembly : 3B7-72720-0
Special tool
r Plate
t Shaft
y O-ring
u Collar
i Plate
1. Securely tighten the tool securing bevel gear A to
ensure it does not move together with the drive
shaft when the shaft rotates.
2. Install of the upper and lower pump cases on the
gear case with the pump impellor not yet installed.
Install so that the clamp assembly w is positioned
as close to the pump case as possible.
3. With the gear case and dial gauge stationery, pull
up on the drive shaft q while rotating it and take a
dial gauge reading. This technique is used to
prevent drive shaft play from affecting dial gauge
readings.

Backlash Reading And Corresponding adjusting shim sizes

Backlash
Notes:
1. The values listed in the table represent the range of dial
gauge readings taken using the various specials tools.
2. Replace shims as necessary in order to adjust to the required
thickness. A + sign indicates that shim thickness should be
increased, while a - sign it should be decreased.
3. It is important to repeat the measuring procedure several
times in order to obtain an accurate backlash reading.
Example:
Shim replacement is unnecessary in cases where backlash
values fall within the designated range.
As an example, a shim of 0.15 mm (0.0059 in) should be added
for a dial gauge reading of 1.00 mm (0.0394).
Shim size: mm
0.1, 0.3, 0.5
(0.0039, 0.0118, 0.0197 in)
0.1, 0.15, 0.3
(0.0039, 0.0059, 0.0118 in)
: 3A3-72713-0
: 345-72723-0
: 332-60002-0
: 353-72245-1
: 3B7-72729-0
Gauge reading
0.31 to 0.62 mm
0.0119 to 0.0244 in
Location
Between lower pump case and bearing.
Between bevel gear A and bearing.
i
6-8
e
w
Dial gauge
r
y,u
Gauge reading Shim size
(mm) (mm)
0.00 to 0.16 -0.10
0.17 to 0.30 -0.05
0.31 to 0.62 ±0.00
0.63 to 0.74 +0.05
0.75 to 0.94 +0.10
0.95 to 1.13 +0.15
1.14 to 1.33 +0.20
1.34 to 1.52 +0.25
1.53 to 1.72 +0.30
1.73 to 1.92 +0.35
1.93 to 2.11 +0.40
2.12 to 2.31 +0.45
2.32 to 2.51 +0.50
Gauge reading Shim size
(in) (in)
0.0000 to 0.0063 -0.0039
0.0064 to 0.0118 -0.0020
0.0119 to 0.0244 ±0.0000
0.0254 to 0.0291 +0.0020
0.0292 to 0.0370 +0.0039
0.0371 to 0.0445 +0.0059
0.0446 to 0.0524 +0.0079
0.0525 to 0.0598 +0.0098
0.0599 to 0.0677 +0.0118
0.0678 to 0.0756 +0.0138
0.0757 to 0.0831 +0.0157
0.0832 to 0.0909 +0.0177
0.0910 to 0.0988 +0.0197
q
t