Yanmar 4LHA-HTP Operation Manual page 542

Chapter 7 Reduction and Reversing Gear
2. Shifting Device
2-2 Clutch gear (A) and clutch gear (B) operation
(Neutral = > clutch gear (A), Neutral = > clutch
gear(B) )
When the shift lever is moved to the clutch gear (A) po-
sition 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 clutch gear
(A). '
When the location pin of the shift lever shaft falls into the
clutch gear (A) position groove on the side cover, the
shift lever shaft moves approx. 3mm to the shift lever side,
and the shifter starts to press the drive cone V-groove to
the clutch gear (A) side by spring force.
2-3 Engagement and disengagement of clutch
(Clutch gear (A) = > Neutral, Clutch gear (B) = »
Neutral)
When the shift lever is moved to the clutch gear (A) po-
sition from the neutral position, the shift lever shaft starts
to revolve, and the location pin disengages from the clutch
gear (A) position groove on 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 (clutch
gear (B) side). The drive cone, however, is engaged with
the clutch gear (A) as the torque force produced by the
revolving centrifugal force.
Further, when the shift lever shaft starts to revolve, and the
positioning pin falls into 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 clutch gear (B) side. The movement of the
shifter to the shift lever side, however, is stopped when the
shifter end contacts the stopper bolt. The shifter
works to press the V-groove of the drive cone to the clutch
gear (B) side. Thus, the drive cone is disengaged from the
clutch gear (A). After this disengagement, the transmis-
sion torque of the drive cone is decreased to zero and the
shift lever is returned to the neutral position by spring
force.
Clutch gear (A)
side
Cone center
Clutch gear (B)
side
At clutch gear (A) engagement position
Clutch gear (A)
i side
Cone center
only
7-1-6
4LHA Series
S h i f t e r center
( C o n e center)
Shift lever shaft
Shift lever center
S h i f t lever
shaft moves s i d e cover
approx. 0.5mm) e t r a l position
n u
(V-groove)
S h i f t e r center
Shift lever shaft
—e
( S h i f t lever shaft
moves approx. 3mm)
S h i f t e r center
Shift lever shaft
(Shift lever shaft
moves approx. 3mm)
Shifter center
C o n e center
Shift lever shaft
Shift lever center
(Shift lever
shaft moves
approx. O.bmm)
Side cover
neutral position
(V-groove)