Lada Niva 4x4, Service Manual

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If deformation exceeds this size, straighten the beam, follow-
ing the procedure given below.
After straightening, carefully wash the beam, clean the mag-
netic plug, put it in place and check the following:
- quality of weld seams and leak-proofness of the beam;
- the beam breather and the beam should be clean inside (no
burrs, chippings or oil residues).
After that paint the beam to protect from corrosion.
Straightening the rear axle beam
Attach to each end of the beam flanges A.70172 (the set
used for straightening and not for checking the beams) and place
it on supports of a hydraulic press so that the ends of the clamp-
ing crossrail 2 (fig. 3-60) were in the zone of deformation. The
most probable location of the zone is in 200-300 mm from the end
faces of the beam flange.
Establish rack 7 with the indicator so that the leg of the indi-
cator will rest against the top part of the flange side surface, and
the arrow of the indicator will point to the division equal to the size
of beam deformation measured by a feeler gauge when checking
the beam. On the other end of the beam place either a rack with
an indicator or a try square 4.
Place rests 6 under the beam (in the zone of deformation),
straighten the beam on a hydraulic press first horizontally and
then vertically, monitoring the results by an indicator or a feeler
gauge with a try square 4.
The maximum pressing force during straightening should not
exceed 98 kN (10000 kgf), so that not to affect the housing pro-
file.
Note. If the height of the rest was experimentally correctly
adjusted, the beam can be straightened without monitoring by a
try square or an indicator
.
Remove the beam from the press and check as mentioned
above, having replaced flanges A.70172 with "test" ones.
In case there is no necessary equipment available, as an
exception, it is possible to straighten the rear axle beam first from
one side, then from the other, but with an obligatory deformation
check from both sides (see "Rear axle beam check").
Axle shafts
Removal and refitting
Remove the wheel and the brake drum.
After unscrewing the nuts fastening the brake backplate to
the axle beam, hold the backplate, and using pusher
67.7823.9516 remove the axle shaft together with the oil screen,
bearing fastening plate and bearing stop ring.
Take out the seal from the beam flange if necessary to renew.
The axle shaft refitting is a reversal to removal, paying atten-
tion not to damage the working edge of the seal. Before refitting
the brake drum, grease the landing shoulder of the axle shaft with
86
Fig. 3-56. Checking for vertical deformations of the rear axle beam using
a try-square on the outside surface of flange A.70172
Fig. 3-57. Checking for twisting of the rear axle beam using a try-square
on the side surface of flange A.70172
Fig. 3-58. Checking the reduction gear mounting