MTZ 1220.3 - Page 58

MTZ 1220.1/1220.3 Section D. Construction and Operation
D10
Clutch Housing
The clutch housing accommodates the
drives of the independent PTO, HLL
pump and a pump of the transmission
hydraulic system.
GEARBOX (GB) (16F+8R)
The gearbox (D-12, D-14) - 16/8, is a me-
chanical fixed-ratio constant-mesh trans-
mission, with 4 forward ranges and 2
backward ranges, with intra-range shift of
gears by means of synchronizers. It pro-
vides 16 forward speeds and 8 reverse
speeds as well as driving of the front
drive axle and the synchronous PTO. The
gearbox consists of gearbox housing, a
drive gear assembly, shaft of reduced
speeds and reverse, gear cluster, secon-
dary shaft, control mechanism and hy-
draulic system
Fig.D-12 GEARBOX
1 – primary shaft; 2, 20 — bushings, 3 — synchronizer; 4 — fork; 5, 7 — dogs; 6 — fork body; 8 — ball; 9 —
spring; 10, 17 — bearings; 11, 14, 15, 22, 23, 25, 27, 28, 29, 30 — pinions; 12 — semi-coupling; 13, 26 —
toothed couplings; 16, 21 — adjusting shims; 18 — secondary shaft; 19 — nut; 24 — gear-cluster shaft; 31
— intermediate shaft.