Dnepr MT10 - Page 89

ili r-valve, depress the tyre bea d into the middl e recess of the rim
<In d, working with tyre irons on the diametricall y opposite s ide,
seize the tyre bead and draw it over the rim edge . To faci lit ate th e
operation with tyre irons, lubri ca te their ends with liquid soap;
by suc c ess ively movi ng the tyre iron s around an d pressing down
the tyrc beads into the rim recess on the diam etrica ll y opposite s i de,
gradually remove the entire bead of the tyre. When separa tin g the
lyre bead from the rim, take care n ot to pinch the tube with tyre
irons. Avoid us ing too great an effo rt as lhis ma y break the tyre
be ad wire. Also, take care to en su re that the lyre bead which has not
yet been removed on the diametrically opp osite side, rests in th e
* middl e recess of the im and the inn er tube docs n ot interfere with
this position of lhe bead (tha t the tube is not pi nch ed) ;
after sepa rati ng one sid e of the lyre from the rim, pull the tyre
off ( preferab ly ne <1 r the local ion of the tu .be valve) a nd tak e out the
lube and rim band.
To comp letely remove the tyre from the wheel rim, proceed as
fo ll ows: holdi ng the wheel vert icall y, in sert the tyre iron at the sid e
of the t
yre bead that has not yet been removed, lever it off the oppo-
site bead of the rim with the e nd of the tyre iron an d force the lyre
bead outwards (in doing so, a l so see that the tyre bead not removed
on the diametrically opposite side rests in th e rim r ecess) . Moving
the tyre irons around, remove all the tyre from the rim.
Aft
er dismantling, examine the tyre and tube, ch eck them for the
absence of punctures and other si gns of damage, make su re that
the inner s urface of the lyre is free of sha rp object s that may st ick
lo it. Wh enever necessar y, re pair the tyrc or tube or replace them.
Re-fit the lyre and tube in the fo llowing order:
powder the inner s urf ace of the tyre with talcum;
fit the rim band, ens urin g that the hole made in the band for the
va lve is matched with the hole in the · rim. See that the rim band
co mplet ely covers all the heads of the nippl es and the s pok es do not
sl ick oul of the nippl e heads;
pu sh a part of the lyr e bead into the rim recess and fit th e ent ire
bead of tyre by means of tyre irons;
in sert the tube va lve into the rim hole , screw a fastening n u .t
onto the removable val ve by two or three thre ads; in sert the valve
core into the lube valve, s lightly pu mp up the tube a nd pu sh it into
the tyre. Care must be tak en to avoid creasing of the tube;
fit
the other bead of the tyre, starting wo rkin g from the side
opposite to the valv e. In doing thi s, see that th e fitted part of the
IJea d enters the rim re cess . As a rul e, about
2
/
3
of the bead is fitted
manu all y, th e remaining pa rt being fitted by means of tyre ir ons.
When us ing tyre irons, lak e care to prevent pinching and, conse -
quentl y, damage to th e tube. To facili tate the re-fitting operation,
th e tyre bead may be slightly lubricated with liquid soap. When re-
fitting the lyre bead, avoid app l ying too great an effort as this may
break the bead wire.
89