TRANSMISSION SYSTEM
4-3
D569-W02 May-2003
1. TROUBLESHOOTING
1.1 TROUBLESHOOTING FOR SHUTTLE SHIFT IN OPERATION ERROR
Noise when the shuttle
is shifted
Gear is disconnected
when shifted
Difficult to shift
Symptom
1.Excessive deflection in the shuttle synchro
assembly (SPEC: 78.2)
2.Chamfering section damaged in the forward gear
(29 gear) and the reverse gear (24 gear)
1.Improper adjustment of the exterior lever
2.Improper shift traveling distance
(traveling distance: 11 mm)
3.Excessive deflection in the shuttle synchro
assembly (SPEC: 78.2)
4.Unstable position of shuttle fork transformed
5.Insufficient tension due to transformed spring
which holds the ball (1 place) inside shuttle fork
1.Retained burr or damages on chamfering section
in the forward gear (29 gear) and the reverse gear
(24 gear)
2.Held when shifted due to damages on spline part
of the shifter’s inside diameter
3.Inclined when shifted due to transformation of
shuttle shift fork
Provable Causes
Replace
Replace
Adjust
Remove the case
and restructure
Replace
Replace
Replace
Regenerate, Replace
Replace
Replace
Solution
1.2 TROUBLESHOOTING FOR MAIN SHIFT SECTION IN OPERATION ERROR
Gear shift disconnected
Starting gets OFF when
starting with
Difficult to shift the main
shift gear
Symptom
1.Damaged jaw at chamfering section of main shift
gear
2.Deficient traveling distance due to interference
with the exterior lever (traveling distance: 11 mm)
3.Unfixed ball and spring when assembling fork
rod of main shift cover section
1.Double gear shifted due to unfixed pin to prevent
double gear at main shift cover section
2.Impossible drive due to little engagement with
gear of gear shifted main shift section
1.Deficient operation due to interference with the
exterior lever
2.Damaged synchro gear
3.Key separation due to excessive over shift capac-
ity traveling distance: 11 mm (0.43 in.)
over shift distance: 13 mm (0.51 in.)
4.Inclined when shifted due to transformation of
main shift fork
Provable Causes
Replace
Correct interference
Assemble
Assemble
Replace
Remove the cause
Replace
Remove the cause
and assemble
as replaced
Replace
Solution
www.mymowerparts.com
K&T Saw Shop 606-678-9623 or 606-561-4983
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