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When assembling, the rolling bearings model 27307 & model 7206 are needed to enforce some
preload. Since the friction of bearing brings about the axial clearance between the front central drive
gears and makes some alteration, while the clearance surpasses 0.1 mm (measured by clock gauge),
the adjustment is required. Dismount the assy of Fig. 5-17, prize open the thrust washer, turn the
round nut and thus enforce the assy to produce 1~1.5 N*m force moment, at last lock the round nut
with thrust washer.
(3) Check on gear-meshing of front central drive gear pair.
After the set-up of front central drive gear pair, we can observe their gear-meshing conditions and
inspect their gear backlash through the square hole on the upper side of front central drive case to
sure whether they are turning normally or not.
① Check the mark
The fitting meshing marks should be on the central drive gears, not less than 13 mm long and 3.5mm
wide, distributing over the middle side of tooth depth, a little bit nearby the narrow end. The mark
must be under the condition of no-oil, first smear evenly the tooth-face of driven gear with red lead
oil, then run the gear both in positive and negative directions in order to make marks over the both
sides of drive gear.
② Check the gear backlash
The tooth space of the gear pair should be 0.15~0.30mm measured by S-shape fuse or other soft
metal, about 25mm long, put in the unworking faces between the meshed teeth, then turning the
follower gear and fetching out the squeezed fuse, the thinnest degree is just the tooth space. We had
batter measure 3 points around the gear circle.
③ Adjustment
The meshing contact mark and tooth space can be adjusted by way of increasing or decreasing the
thickness of gaskets δ1 (see Fig. 5-19) between the front central drive housing and the front central
drive gear assy, and of gasket group δ1 (see Fig. 5-15) between the front axle sleeve and front
central housing. Point should be noted that group δ2 have two groups between the right side and
the left side, while increasing the left side thickness, decreasing correspondently the right one’s
number at the same time. The details of adjustment, please see “Adjustment of teeth contact
condition for spiral bevel gears” on Chapter 5.
(4) Adjustment of two-stage bevel gear pair, front axle side drive (see Fig. 5-15)
Here is the same way with the above-mentioned to adjust the tooth contact two-stage bevel gear
pair, side drive and clearance by means of increasing and decreasing the thickness of adjusting
gasket δ3 of front one-stage drive gear, side drive; and of adjusting gasket δ4 of bearing cap under
the side drive;again of the adjusting gasket δ5 of the steering rocker bearing cover; and once again
of the gasket δ6 of front side drive housing cover.
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