Dnepr MT9 - Dismantling and Assembling the Main Drive

insta ll the propeller s ha ft yoke on th e 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 ring s, g irdl es press in the beari n gs and
inst;-ill the loc king ring s.
Dismantling and Assembling the Main Drive
To disassemb le the m ain drive, do the fo ll owing:
remove th e br ake s hoes with the sp ring s;
un
screw the plug of the filling hole, dr ain off th e oil a n d wash
the inn er space with ker osene;
und o lhe sc rew securing the brake cam lever and r emove the
ca m;
unscrew the dipst ick;
undo th e screws secu rin g the gland cover, remoYe the cover and
the co ll ar ru.bber g l and with the sp ring ;
un
sc rew the nuts sec uring the casing cover, remo ve the was h ers
a nd , by tapping the end of the driven gear hub with a copper ham -
mer,
remove th e cover with the gasket and the driven gear- hub as-
se mbly;
remove the needle ro ll ers (45 pes) and ad ju s tin g br onze washer
from the hub ;
remove the driven gear-hub assemb ly from the casi ng cover. To
do this, in sert the rear whe el ax le into the ce ntral opening from the
side of the
hub so that th e axle is se t ag ain st t he di sta n ce bu shin g;
ho lding th e hub by h an d, knock th e cove r off the bearing by t apping
th e ax le e nd ;
pre ss out th e ball bearing from th e hub throu gh three specia l
hol
es made in it;
when pres s ing out, t ake care to pr event the bearing misalign-
me nt ;
un screw th e nut fastening th e driving gear bearing, tu.rn in g th e
nut clockw i se (left- hand thread);
insta ll the cas ing in a vice a nd , by kn ocking out the radia l thr ust
bearing through the sl ot in the casi ng by means of a coppe r drift,
remove the gear;
re mo ve th e a dju s ting wash ers;
take
out the needl es of th e driv ing gea r needl e bearing from the
cas ing.
Repl
ace the defective part s, if any.
Re-assemble th e main dri ve in revers e order .
When fitting the needle rolle rs int o th e bearings, lubri cate their
seats with grease and tak e care not to let the rollers fall o ut durin g·
assembly of the mating me mber s. Use a mandrel to fit th e collar
gl and on the hu b. In doing so, ca re mu st be taken to ens ur e th at
the drain hole in the casing is aligned with the special hol e of th e
gland.
Th e main driv e asse mbl y is illustrated in Fig . 31.
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