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- the tire casings, inner tubes and flaps should be clean and dry;
- the tires, which have been stored at a temperature below zero, are recom-
mended to be warmed up in a warm room to a temperature above zero;
- direction of wheel rotation should coincide with that of the tread pattern
(for tire casings having a directed pattern);
- rims and their elements should not have damages, bends, cracks, sharp
edges and burrs, corrosion both on the exterior and interior sides and in the points
of contact with tires, worn
-
out fastening holes;
- when mounting the tires at a workshop, check the rim for radial and axial
wobbling that should not exceed 4 mm.
Before assembling the wheel
check up technical condition of the tire casing,
inner tube, flap, lock and bead rings.
Examine the exterior and interior of the tire casing with the help of a bead
expander, remove alien objects (sand, small stones, etc.) from its interior part, wipe
the inner and setting surfaces of the tire casing, eliminate damages and galling of
the beads, cut the rubber projections and fins flush
-
mounted with the main sur-
face of the bead rubber. Powder the tire casing interior and the inner tube and flap
exterior with talc.
To make the assembly easier and ensure the complete setting of the tire onto
the setting surfaces of the rim it is recommended to apply soap solution, glycerin or
liquid paraffin onto the tire casing beads. Do not use mineral oil (solid oil, engine
oil, etc.) as a lubricant.
If manufacturing or operational defects have been detected, it is not allowed to
use the tires for mounting.
Check the inner tubes and valves for sealing; do not use the inner tubes with
separation in the joint and the damaged valve.
Remove mud, rust and the rest of rubber from the wheel surface, especially
from the surface of the rim, bead and setting rings, which faces the tire. Paint
trimmed spots and the spots, where paint is damaged, with a fast
-
drying enamel,
having eliminated burrs and metal scores first.
Check setting of the locking ring on the rim and on the control cylinder hav-
ing the same diameter:
- clearance in the seam between the ring ends should be 45-55 mm, loos-
ening of the ring ends from the rim — 1.5 mm, along the arc up to 50 mm;
- local clearances between the lock ring and rim should not exceed 1.5 mm
and smoothly decrease to both sides along the arc not more than 1/4 of circle;
- twisting of the lock ring should not exceed 15 mm.
If the clearances and twisting of the lock ring exceed the said numbers, the
ring is not suited for assembling and should be fluted and squeezed or replaced by
a new one.
The wheel parts, which have infringed shape and cracks, should be rejected as
well.
The wheels and tires, which are only in good working order, are subject to
mounting (operation).
When mounting and dismantling tires, the safety regulations should be ob-
served as follows:
- do not remove and do not put the wheel with tire onto the truck, if you
are not convinced that the wheel has been hung up securely. Slack off and
tighten the nuts on the truck that is not hung up and is braked;
- do not remove a faulty wheel (cracks in the area of welded seams, damages
or incorrect position of the lock ring on the rim, bent bead ring, wheel wobbling
