Dnepr MT9 - Wheel Repair

Replace the parts that <lre excess i vely worn or defective. The
bevel gears shou ld be replaced on ly by p(jirs, as made up by the
Manufacturer .
To r
emove the radia l t hr ust bearing from the driving beve l gear,
usc an appliance TIP-1363.
In order to pre ss out the ou.ter race of the needle bearing from
the cas ing, heat the !alt er up to 75-9 0°C and, using a lift er
TIP-136 1, remove the bearing race.
To pre ss out the casing bushing which is used as a n outer race
of the roller bearing of the driven gea r hub, fir st h eat the cas ing
up to 75-90°C.
After repairing a nd assembling the m ain drive, in case replace-
ment of th e gea rs has b een car ried out, check the backlash in the
gearing. The back l ash is set by placing ad ju s ting washers between
the ball be ar ing of driven gear hub and the cas ing cover.
VII. R.EPAIR.ING THE WHEEL
Prior to r epa iring the removed wheel, check the fo l lowing:
wear of the lyre (signs of damage on it);
absence of cracks and dent s on the rim;
wear of the brake drum s urface;
condition of the tape r ed roller bearings;
r adia l and l ate ral ru n-out of the rim a nclt yr e;
avai l abi lity of th e spok es and their uniform tensionin g.
The wheel
hLLb bea ring s a re c he cked for good cond iti on by ro tat -
ing the tightened axle and rock in g it in lhe wheel ra ther than by
rotating and rocking the wheel on the axle, sin ce in the latter case
th e overtightening of th e bearing·s may not be noticed owin g to th e
great ma ss of the wheel.
The axle must rot ate freely, without an y notic eable pl ay anrl
seizi ng, pr oducing no c li cks, et c.
The following r ad ial and lateral run- o ut s are permissible during
rotation of the whee l: for wheel rim- not greate r th an 1.5 mm, for
lyre- not greater than 3 mm. Repair the whe el, if found defect ive.
I. DISMANTLING AND ASSEMBLING THE WHEEL
R.emoval and Re-fitting of the lyre
To remove the tyre from the wheel, pr oceed as follows:
unscrew the valve ca p and defla te the tyre by sc r ew ing out the
valve core; und o the nut secu ring the removabl e valve to the rim
a nd pu sh the va lve inside th e tyre;
pla ce the wheel with th e brake drum down and pr ess out the tyre
sides so as to make them sepa rate from the sid es of the rim;
at a point approximate ly
1
/4 of the circ um ference from the tube
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