Forward And Reverse Clutch Operation; Engagement And Disengagement Of Clutch - Yanmar 3JH3E Service Manual

Chapter 7 Reduction and Reversing Gear
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2-2 Forward and reverse clutch operation
(Neutral
⇒
Forward; Neutral
⇒
Reverse)
When the shift lever is moved to the forward position
from the neutral position, the shift lever shaft starts to
revolve, and the location pin disengages from the
neutral V•groove position of the side cover. (Shift lever
moves approx. 0.5mm to the drive cone side.) At this
time the shifter, which is set on the eccentric hole of the
shift lever shaft, moves the drive cone's V·groove to the
forward large gear.
When the location pin of the shift lever shaft falls in the
forward position groove of the side cover, (the shift lever
shaft moves lo the shift lever side approx. 3mm), and the
shifter stars to press the drive cone V-groove to the for·
ward large gear side through the spring force.
2-3 Engagement and disengagement of clutch
(Forward ⇒
Neutral;
Reverse ⇒
Neutral)
When the shift lever ·1s moved to the forward posif1on
from the neutral position, the shift lever shaft starts to
revolve, and the location pin disengages from the for-
ward position groove of the side cover. (The shift lever
shaft moves approx.
3mm
to the drive cone side.) At
this time, the shifter which is set on the eccentric hole
of the shift lever shaft is moved to the neutral side
(reverse large gear side). The drive cone, however, is
engaged with the forward large gear through the torque
force produced by the revolving centrifugal force.
Further, when the shift lever shaft starts to revolve, and
the positioning pin falls in to the neutral V-groove position
of the side cover (the shift lever shaft travels approx.
5mm to the shift lever side), the shifter moves to the shift
lever side(to the spring side) while moving the V-groove
of the drive cone to the reverse large gear side. The
movement of the shifter to the shift lever side, how13v-
er, is stopped when the shifter end contacts the stop-
per bolt. The shifter only works to press the V-groove
of the drive cone to the reverse large gear side. Thus,
the drive cone is disengaged from the forward large
gear. After this disengagement, the transmission torque
of the drive cone is decreased to zero and the shift lever
is returned to the neutral position by the spring force.
7-36
Shifter center
(Cone center)
Forward
Side
_p
/r
Reverse
/ I
side
(Shift lever
~ - - - - ' - ' - ' - I
Side cover shaft moves approx. 0.5mm)
neutral position (V-groove)
Shifter center
7
(Shift lever shaft Reverse
moves approx. 3mm) side
At forward engagement position
/-
(Shift lever shaft
Forward Side
Cone center
Reverse
side
moves approx. 3mm)
L._... _ _ _ _
L..LLJ
Shifter center
Cone centar
Shift lever shaft
Forward
Side
Reverse
side
~
Ii
Side cover
(Shift laver
~ - - - - - ' - - ' - - ' - I
shaft moves approx. 0.5mm
neutral position (V-groove}
Printed in Japan
HINSHI-HS009