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3.12.5 Check and Adjustment of Preload in differential conical bearings
The axial preload in differential conical bearings should be between 0,01 and 0,08
mm.
It is necessary to make adjustment by nuts 2 tightening (figure 3.12.5). The axial
bearings preload should correspond to moment of differential rotating resistance between
0,6 and 6 Nm.
Total moment of rotating resistance together with gear 1 bearings preload should
make between 1 and 7,6 Nm.
Figure 3.12.5 – Differential in central reduction unit casing
3.12.6 Check and Adjustment of Backlash in Main Gear Pair of Central Reduc-
tion Unit
The backlash in main gear pair of central reduction unit should be between 0,18 and
0,35 mm. The contact pattern should occupy not less than 50 % of tooth surface and con-
tact pattern should be situated in the center of tooth or closer to cone point. Ensure back-
lash by means of nuts 2 (figure 3.12.5) keeping backlash adjusted before in differential
conic bearings for this purpose the nuts located from the different sides of differential
should be screwed or unscrewed with identical angle. At adjustment turn over differential
in bearings, so that their rollers have taken correct position in race.
ATTENTION: MAIN PAIR GEARS 20 AND 40 (FIGURE 3.12.2) OF CENTRAL RE-
DUCTION UNIT SHOULD BE REPLACED ONLY TOGETHER. GEARS OF MAIN PAIR
ARE COUPLED AT FACTORY AND SHOULD HAVE IDENTICAL NUMBERS!
ATTENTION: IT IS NECESSARY TO REPLACE DIFFERENTIAL HOUSING 3 AND
COVER 26 (FIGURE 3.12.2) ONLY AS A SET AND THIS PARTS SHOULD HAVE IDEN-
TICAL NUMBERS. IT IS NECESSARY TO COMBINE THESE NUMBERS AT CONNEC-
TION OF HOUSING 3 WITH CASE 26!
ATTENTION: CHECK MAIN PAIR GEAR ENGAGEMENT TRUTH ACCORDING
TO THE CONTACT PATTERN AND WAYS OF CONTACT PATTERN CORRECTION ON
THE ANALOGY OF REAR AXLE MAIN DRIVE AS IT IS SPECIFIED IN SUBSECTIONS
3.6.7 AND 3.6.8!
1 – drive gear; 2 – nut.
153
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