Disassembly-assembly manual for tractor BELARUS-1221.2/1221
В
.2/1221.3/1221.4
85
4.4.8 Assembly of gear box
Assembly GB in reverse order.
Parts must be washed. Bearings, balls and friction bushings must be lubricated with oil.
Torques of bolt
ов
:
8
– 1.4...1.7 kgf m;
16
- 12.. .14 kgf m;
10
- 3...3.5 kgf m;
18
- 16...19 kgf m;
12
- 5...6 kgf m;
20
- 23.. .27 kgf m;
Adjustments:
а
) end face of conical bearing 12 (Figure 4.98) must be located 15
-0,15
.mm away from GB rear
end face. Adjustment is made by putting necessary amount of spacers under cup flange 11, with nut
3 torqued to 22…30 kgf m, and adjustment washer 5 being removed.
b) tension of conical bearings 4 and 12 is adjusted by placing adjustment washers 5 of necessary
thickness. Thus moment of resistance to rotation of secondary valve 13 must be
М
= 0.5...0.7 kgf m.
Before checking moment of turning through, knock end faces of shaft 13 with copper knocker.
- If moment of resistance to shaft rotation is larger of set value, washer 5 must be of larger
thickness.
- If moment of resistance to shaft rotation is smaller of set value, washer 5 must be of smaller
thickness.
с
) torque nut 3 to 22...30 kgf m and centre-pop in grooves of shaft 13.
During assembly of GB pay attention to:
When installing gears’ assembly:
- Between end face of gear 16 and end face of bearing 15 place a device excluding skew of
external shell of bearing.
- Using lifting mechanism lower gears’ assembly inside gear box body.
- See that clutch 14 and yoke driving it were put put om gear train, and when mounting gears’
assembly splines of clutch 14 came into engagement with splines intermediate shaft 17.
- As soon as external shell of bearing 15 starts being pressed inside GB body, remove device
excuding its skew. Complete mounting gears’ assembly inside GB body controlling that cup 19 of
gears’ assembly fits GB plane. Unscrew eye-bolts. Fasten gears’ assembly with bolts.
When mounting body of yokes split keys of yokes 2 must be inserted in groove of synchronizers’
carriage 1.
When mounting control cover: lever 6 must be installed in groove of lead 8, lever 7 must be
installed in groove of yoke 9.
In fully assembled gear box:
- Fixing elements must securely lock yokes in neutral and engaged positions.
- After tightening fastening nuts gears must freely rotate on shafts without jams.
- During rotation of tooth clutches and synchronizers yjere should be no signs of jams of switching
yokes in circular grooves.
- Allowable moment of resistance to turning through of GB primary shaft 18
КП
in neutral position
of synchronizers should not exceed 0.15 kg m.
Summary of Contents for Belarus 1221.2
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Page 137: ...Disassembly assembly manual for tractor BELARUS 1221 2 1221В 2 1221 3 1221 4 136 Figure 4 166 ...
Page 138: ...Disassembly assembly manual for tractor BELARUS 1221 2 1221В 2 1221 3 1221 4 137 Figure 4 167 ...
Page 203: ...Disassembly assembly manual for tractor BELARUS 1221 2 1221В 2 1221 3 1221 4 202 Figure 7 5 а ...