Komatsu SAA6D140E-3 - Page 105

140-3 SERIES
11-41
STRUCTURE AND FUNCTION, MAINTENANCE STANDARD TIMING GEAR
Unit: mm
No. Check item Criteria Remedy
1
Clearance between main
idler gear bushing and shaft
Standard
size
Tolerance
Standard
clearance
Clearance
limit
Replace
bushing
Shaft Hole
56
–0.016
–0.029
+0.034
+0.009
0.025 –
0.063
0.20
2
Clearance between sub
idler gear bushing and shaft
56
–0.016
–0.029
+0.055
0
0.016 –
0.084
0.20
3 End play of main idler gear
Standard size Repair limit
Replace
thrust
bearing
0.06 – 0.24 0.4
4 End play of sub idler gear 0.11 – 0.23 0.4
— Backlash of each gears
Measuring
point
Gears Standard size
Repair
limit
Replace
A
Crankshaft gear and main
idler gear (Large)
0.028 – 0.312
0.6
B
Main idler gear (Small) and
fuel supply pump drive gear
0.016 – 0.278
C
Main idler gear (Small) and
camshaft gear
0.016 – 0.278
D
Main idler gear (Large) and
sub idler gear
0.028 – 0.313
E
Sub idler gear and oil pump
drive gear
0.080 – 0.417
F
Sub idler gear and water
pump drive gear
0.095 – 0.346
G
Camshaft gear and air
compressor drive gear
0.118 – 0.369
H
Fuel supply pump drive
gear and PTO gear (Lower)
0.118 – 0.369