Dismantling And Assembling The Main Drive - Dnepr MT9 Repair Manual

insta ll t he propeller sha ft yoke on the seco nd pair of the cross
pins. wi th the lu bricator towards the lubr icating gun recess; in a
like m anne r, fit the seali ng rings, g irdl es press in the beari n gs and
inst;-ill th e locking rings.
Dismantling and Assembling the Main Drive
To disassemb le the m ain drive, do the foll ow in g:
remove th e br ake shoes w ith th e sp rings;
u nscrew th e plug of the filling hole, dr ain off th e oi l a n d wash
th e inn e r space with ke rosene;
undo lhe sc rew securing th e brake cam leve r and r emove th e
ca m ;
unscrew th e dipst ick;
undo th e screws secu rin g the gland cover, remoYe th e cover and
th e co ll ar ru.bb er g land w ith the sp ring ;
un sc rew t he nuts sec uring the casing cove r, remove the washers
a nd , by tapping the end of the driven gear hub w ith a copper ham -
m er, remove the cove r with th e gasket and the driven gear- hub as-
sembly;
remove the needle ro ll ers (45 pes) and ad justin g br onze washer
from the hub ;
remove the driven gear-hub assemb ly fro m the casi n g cover. To
do thi s , insert the rear wheel ax le into t he central opening from th e
s id e of th e hub so that th e ax le is set ag a in st t he di sta nce bushin g;
holding th e hub by han d, knock th e cover off the bearing by t apping
th e ax le e nd ;
press out th e ball bearing from th e hub throu g h three specia l
ho les made in it ;
when pres sing out, t ake care to prevent the bearing misalign-
m ent ;
un screw th e nut fastening th e driving gear bearing, tu.rn in g th e
nut clockw ise (left- hand thread);
insta ll the cas in g in a vice a nd , by knocking out the radia l thr ust
bearing through the s lot in the casi ng by m ea ns of a copper drift,
remove the gear;
remove th e a dju sting washers;
t a ke out the nee dl es of th e dri v ing gea r nee dl e bearing from th e
cas in g.
Rep lace the defective parts , if any.
Re-assemble the m a in dri ve in reverse order.
When fitting the need le roll ers into th e bearings, lubri cate their
seats with grease and take care not to let the rollers fall o ut durin g·
assembly of the mating m embers . Use a mandrel to fit the collar
g land on the hu b. In doing so, ca re mus t be taken to en s ure th at
the drain hol e in th e casing is aligned with th e special hol e of th e
g la nd .
Th e main drive asse mbl y is illustrated in Fig. 31.
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