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

Chapter 7 Reduction and Reversing Gear
_2._S_h_1_·ft_in...;g~D_e_v_ic_e _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 3,4JH3(B)(C)E
2-2 Forward and reverse clutch operation
(Neutral
⇒
Forward; Neutral
⇒
Reverse)
When the shift lever is moved to 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 drivecone side.) Al this time the
shifter, moves the drive cone's V-groove to the forward
large gear.
When the location pin of the shift lever shall falls in the
forward position groove of the side cover, the shift lever
shaft moves approx. 3mm to the shift lever side, 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 is moved to the forward position
from the neutral posit'1on, the sh·1ft 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
tt1is 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 shilt 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, howev-
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.
7-8
Shifter center
__ F_o_rw_a_r_d_~ (Cone center)
i\ ~
Side
I /
Shift lever shaft
~
\\, I
Shift lever center
' I
I
' I '
Forward side
Cone center
Reverse
side
At
Reverse
side
Shifter center
Shift lever shaft
I
'
(Shift lever shaft
moves approx. 3mm)
engagement position
Shifter center
Shift lever shaft
/
/
(Shift lever shaft
moves approx. 3mm)
Shifter center
1 r r - - - - ~ Cone cenlar
Shift lever shaft
Forward
Side
Reverse (Shift laver
side shaft moves
~,..._ _ _ _ __, approx. 0.5mrrt-.
Side cov~r
neutral pcsition
(V.groove)
Printed in Japan
HINSHI-H8009