MASSEY FERGUSON 5400 Service Manual page 223

A . General
The mainshaft (69) is mounted on two taper roller bear-
ings (1) (17) with bearing cups (2) (16), resting in the
two lower bearings of the main unit. Each bearing cup
has a root face giving it maximum contact with the
housing.
At the front it receives the drive pinion (67).
Between the two lower bearings, it holds the 1st (7)
and 2nd (14) idle mounted drive pinions, as well as the
1st and 2nd gear synchromesh assembly (11), whose
hub is held by splines. At the rear, it holds the 4th gear
drive pinion (18) and the 3rd and 4th gear synchromesh
assembly (23).
The 1st, 2nd (11) and 3rd, 4th (23) synchronizers are of
the double cone type.
The rear bore contains a needle bearing that holds the
front end of the output shaft. The turning parts are
lubricated by a central channel and radial bores.
The taper roller bearings are mounted with preload
obtained by shim(s) (3) inserted between the serrated
washers (6) positioned against the drive pinion (67) and
the ring (8). A washer (77) with flat sections acts as a
stop for the 1st drive pinion (7).
Massey Ferguson 5400 - Issue 1.a
Parts list (Fig. 1)
(1) Bearing cone
(2) Bearing cup
(3) Shim(s)
(6) Serrated washers
(7) 1st driving pinion
(8) Ring
(11) 1st, 2nd double cone synchronizer
(14) 2nd driving pinion
(16) Bearing cup
(17) Bearing cone
(18) 4th driving pinion
(23) 3rd, 4th double cone synchronizer
(26) Circlip
(33) 4th synchromesh cone
(47) 3rd synchromesh cone
(67) Drive pinion
(68) Nut
(69) Mainshaft
(70) Snap ring
(71) Lubricating pipe
(72) Spring
(73) 1st synchromesh cone
(74) 2nd synchromesh cone
(77) Washer with flat sections
(78) Tab washer
GBA20 mainshaft with Power Shuttle
Overall view
Fig. 1
05H02.3