Lada Niva 4x4, Руководство по обслуживанию

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should be no roughness or scuffings on the rolling surfaces of the
shaft front end.
Check the condition of needle rolling surface in the opening
of the primary shaft.
Examine the intermediate shaft, no chipping or excessive
wear of teeth is allowed.
The surface of the reverse gear shaft should be absolutely
smooth, with no traces of jamming. The mounting gap between
the shaft and the bush of the reverse idler gear should be 0.056-
0.09 mm, the maximum permissible size is 0.15 mm. The clear-
ance is checked by measuring the shaft diameter and the open-
ing of the gear bush. On new parts the shaft diameter is equal to
19.079-19.094 mm, and the inner diameter of the press-fitted
bush is 20.05-20.07 mm.
Insignificant surface roughness can be removed with fine
sandpaper. In case of serious damages and deformations renew
the shaft.
Gears.
There should be no damages or excessive wear of
teeth. Special attention should be payed to the condition of the
teeth end faces on the synchro unit crown.
The bearing pattern between the gear teeth should cover the
complete working area, which should be smooth with no signs of
wear. Check the gear mesh clearance, the mounting gap should
be 0.10 mm; maximum wear-gap - 0.20 mm.
The mounting gap between the bushes and the 1st/5th
gears, and between the output shaft and the 2nd/3rd gears
should be 0.05-0.10 mm; maximum wear-gap - 0.15 mm.
If wear exceeds permissible limits, renew the gears.
Bearings. Ball and roller bearings should be in perfect con-
dition. Their radial gap should not exceed 0.05 mm.
Press the inner ring to the outer one with fingers, turn one of
them in both directions, the rolling thus should be smooth. On the
surface of balls and rollers and the rolling paths of the rings no
damage is permissible. Renew damaged bearings. When replac-
ing the input shaft front bearing use pusher A.40006 (see fig. 2-
11); it is possible not to remove the flywheel.
Rods and forks. No deformation of gear shift forks is accept-
able. The rods should freely slide in the borings without signifi-
cant gaps.
Check the condition of rod collets, springs and detent balls.
Parts having any traces of jamming or wear should be renewed.
Hubs, sleeves and baulk rings. Ensure the hubs have no
damage, in particular on the sleeve sliding surface. Draw special
attention to the condition of the sleeve spline face.
The synchro rings should show no sign of excessive wear.
They should be renewed in case the end face is resting on the
synchro unit sleeve. Roughness interfering free sliding, should be
removed with a fine-cut file. Badly worn parts should be renewed.
Transfer box
Fault diagnosis
Diagnosis Remedy
Vibration of the transfer box and body floor (in the area of front
seats) when starting and accelerating to 80 km/h
1. Transfer box not centralised
against power unit
2. Loose or damaged transfer box
mountings, and power unit rear
mount
3. Hard turning or jamming of
front or rear propeller shaft joints
4. Incomplete handbrake release
5. Hard turning of layshaft CV-
joint
Vibration of the transfer box and body floor
(in the area of front seats) at a steady-state movement
(most typical at speed of 80-90 km/h)
1. Propeller shafts out-of-balance
2. Interaxial differential out-of-
balance
3. Jammed propeller shaft U-
joints
4. Jammed layshaft CV-joint
5. Loose engine mounting nuts
and bolts or damaged engine
supports
6. Bended bolts and layshaft flex-
ible coupling flange
Noise at cornering or wheel slip
1. Hard rotation of differential pin-
ions on shaft
2. Jammed axle drive gears in dif-
ferential housing
3. Damaged differential pinion
working surface
4. Large axial clearance of axle
drive gears in differential housing
Hard gear switching or differential lock up
1. Jammed coupling on hub
splines or on differential housing
splines
2. Dents on smaller crown teeth
on top or lower gears, on clutch
teeth and on splines of front axle
drive shaft
3. Bended fork or rod
4. Deformed transfer box drive
levers
5. Jammed drive levers on shafts
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1. Centralise transfer box
2. Tighten securing nuts and bolts,
renew if necessary
3. Repair U-joints or renew shafts
4. Adjust handbrake
5. Inspect boot and joint. Renew
joint in case of damage
1. Renew worn or damaged parts
2. Renew worn or damaged parts
3. Renew worn or damaged parts
4. Use shims to adjust clearance to
0-0.10 mm
1. Renew or repair propeller shafts
2. Renew or repair differential
3. Repair joints or replace shafts
4. Inspect boot and joint. Renew
joint in case of damage
5. Tighten mounting nuts and bolts
or renew engine mounts
6. Renew bolts or layshaft
1. Rectify burrs, dints, scores, renew
bad parts
2. Rectify burrs, scores, renew bad
parts
3. Straighten deformed parts
4. Straighten levers, renew if neces-
sary
5. Remove levers, clean shafts and
bushes. Renew bad parts