21
5) Inspect and check valves.
Inspect the heads and stems of valves, and replace
those with significant damage, wear, or deformation.
Use a micrometer to measure valve stems at
positions A, B, and C, and replace those that fall
below the usage limit.
Valve stem wear (mm)
Intake valve
Exhaust valve
Assembly
standard
Usage
limit
Assembly
standard
Usage
limit
6.955 to
6.970
6.89
or less
6.940 to
6.955
6.84
or less
Valves with heads whose thickness exceeds the
usage limit should be replaced.
Valve head thickness (mm)
Assembly standard
Usage limit
0.925 to 1.075
0.5 or less
If the clearance between the valve and valve guide
exceeds the usage limit, replace the valve.
Clearance between valve and valve guide (mm)
Intake valve
Exhaust valve
Assembly
standard
Usage
limit
Assembly
standard
Usage
limit
0.03 to
0.06
0.20
or more
0.040 to
0.065
0.25
or more
Use 15 degree, 45 degree, and 75 degree seat
cutters to repair the seat so that the width and
recess are within the assembly standard.
Valve seat contact width (mm)
Assembly standard
Usage limit
1.2 to 1.8
2.5 or more
Valve seat recess (mm)
Assembly standard
Usage limit
0.6 to 1.2
1.8 or more
Fig.2-5-6
Fig.2-5-7
Fig.2-5-5
Fig.2-5-9
Fig.2-5-8
Summary of Contents for SG280E
Page 1: ...SLOPE MOWER 2011 4 MODEL SG280E...
Page 2: ...1...
Page 7: ...6 Body and operation areas 1 2 Overall view part names Fig 1 2 1 Fig 1 2 2...
Page 8: ...7 Fig 1 2 3 Total elapsed time Seat swing lever...
Page 10: ...9...
Page 14: ...11 Model N843 2 2 Cross section diagrams Fig 2 2 1...
Page 15: ...12 Model N843 Fig 2 2 2...
Page 53: ...50 HST 2WD 4WD 2WD 4WD 2WD 4WD 3 2 Functions Fig 3 2 1...
Page 59: ...56...
Page 60: ...56 Section 4 Electric Components 4 1 Layout diagram 4 2 Safety system electric components...
Page 109: ...105 Section 6 Wiring Diagram 6 1 Wiring diagram...
Page 110: ...106 6 1 Main circuit diagram...
Page 111: ...107 Fig 6 1 1...