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8 - 19
Gearbox Inspection
All parts should be inspected for signs of wear or damage,
paying particular attention to the parts detailed below.
Section F
Transmission
9803/6020
Section F
8 - 19
Issue 1
Track Gearbox
Part(s)
Inspection
Standard
Permissible
Measuring
Corrective Action
Measurement
Value
Tolerance/
Tool
Area
Condition
a
. Hub
1
Pin bore area Surface No scratches, Visual check
roughness
eccentric wear or
12S
thermal seizure
b
.
Spindle
2
Bore diameter of
ø 19 mm
Max. ø 19.056 mm
Cylinder gauge
reamer hole
(0.748 in)
(0.750 in)
c
.
RV gear
4
Flaking on the
0
Flaking 6.5 mm2
Visual check
RV gear
5
trochoid gear surface
Pitting on the
0
Flaking 6.5 mm2
Visual check
trochoid gear surface
Flaking on the needle
0
Flaking 6.5 mm2
Visual check
roller bearing 23
aperture.
d
.
Crankshaft
Flaking on the
0
Flaking 6.5 mm2
Visual check
9
eccentric lobes.
Pitting on the
0
Flaking 6.5 mm2
Visual check
eccentric lobes.
e
.
Distance
Wear on the seal
0
Wear 0.2 mm
Contour/
piece
10
surface.
(0.008 in)
roughness
tester.
f
.
Floating
Seal surface
Surface
No damage or
Visual check
seal
31
roughness
rust is
0.4S
permissible
g
.
Thrust
Wear of sliding
Surface
Wear 0.010 mm
Contour/
Lap the slide surface
plate
153
surface for piston
roughness
(0.0004 in)
roughness
to correct slide
damage.
shoe 106.
0.4S
tester
(Correctable wear
0.020mm)
h
.
Cylinder
Eccentric wear of
Surface
Wear 0.005 mm
Contour/
Lap the slide surface
block
104
slide surface for
roughness
(0.0002 in)
roughness
to correct slide damage.
timing plate 109
0.4S
tester
(Correctable wear
0.020mm)
Cylinder boreø
17.004 mm
Max. ø 17.014 mm
Cylinder
diameter
(0.069 in)
(0.6698 in)
gauge
j
.
Piston
105
/ Outer diameter of
ø 16.995 mm
Min. ø 16.985 mm
Indicator
piston shoe piston 105
(0.67 in)
(0.668 in)
micrometer
100
assembly
Eccentric wear of
Surface
Wear 0.005 mm
Contour/
Lap the slide surface
thrustplate sliding
roughness
(0.0002 in)
roughness
to correct slide damage.
surface of shoe 106
0.4S
(Correctable wear 0.020
mm)
Backlash of ball joint
0.1 mm
0.2 mm
Lever type dial
between piston 105
(0.004 in)
(0.008 in)
gauge
and shoe 106
Summary of Contents for JS70
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