Dnepr MT10-36 - Shafts; Starting Mechanism; Gearshift Mechanism

Shafts
The primary shaft is installed in two ba ·ll bearings. The shaft is
made integral with the crowns of the reverse, fi rst and second speed
gears. The third and fourth speed gears are fittted on the shaft . The
fourth gear is kept from turning on the shaft by means of a Wood-
ruff key. The
third speed gear is linked to the fourth speed gear with
the aid of end face lugs.
The
secondary · shaft which is also supported by two ball bea-
rings, has a toothed crown for the reverse sliding g ear . Pr essed on
the shaft are two spline d sleeves that are prevented from turning on
the shaft by keys. The first, second and fourth speed gears freely
rotate on metal - ceramic bushings, while the fourth s. peed gear tums
on a bronze bushing. The gears are linked •to the shaft by me ans of
ge arsh ift mov able sleeves. No special pro vision is made to fe ed oil
to the friction surfaces.
Sta r ting Mechanism
The starting mechanism incorporate s two shafts with geans : star -
ting shaft 33 (Fig. 15) and intermed iate shaft 5. Two gears wi 1h
twelve ratchet teeth on their end faces are free to rotate on the in-
termediate shaf1t. The front end of the shaft is pressed into the ca-
sing.
Pres sed onto the splines of the starting shaft is a toothed quad-
rant. The quadrant is . pressed to rubber .Pecoil buffer 5 (Fig. 1 7)
by a torsion spring.
The spring is wound up by -g i ving bushing 1 (Fig. 15), fitted in
the front wall of the casing, a haLf-turn counterclockwise.
The
bushing is sealed by a rubber ring, and the shaf ·t, by a do-
uble - rim carcass-type gland. The kick sta · rter lev 1er is secured to the
starting s haft by means of a key bolt. When the kick lever is depres-
sed with the foot the quadran1 meshes with the small gear of the in-
termediate shaft, which gear is enga ged, by means of the end face
ratchet with the large gear being in constant mesh with the second
speed gear of the gear box primary shaH . After the en gine has been
started, and the foot taken off the kick lever, the latter together with
the quadrant . returns to the in H ial position under the adion of the
return spring . The quadrant impa· ct is t ake n up by t.he rubber buffer
with a steel facing.
Gearshift Mechanism
Four forward speeds are engaged by spli ned sleeves 13 (Fig. 15)
which are fitted on the secondar y shaft and moved along it . by me -
ans of g-earshift forks. The special lugs of the forks ente r the shaped
notch es of the gearshift disk. As the disk is r dtate d, the forks move
to a corresponding position on shaft 6 (Fig. 18) in sta lled inside the
casing. Fitted on the gearshift disk are three pins and the spring of
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