New Holland WorkMaster 50 Service Manual page 127

A Main gear lever (1st/2nd & 3rd/4th)
B Range selector lever (H/L)
PTO Coupler
C
D Reverse
The speeds are shifted by meshing gears 1st (4), 2nd (5), 3rd (6), and 4th (7) in succession with the gearbox driven
shaft. This is done by means of gear couplers (9) and (10). If coupler (9) is shifted, say to the left, its internal teeth will
connect additional gear ring of 1st gear (4) with toothed bushings secured on the driven shaft. As a result, 1st gear (4)
will rotate together with the driven shaft and transmit rotation to pinion shaft via range shaft (2). When gear coupler
(9) is shifted to the right, the driven shaft will become rigidly connected with 2nd gear (5) having a larger number of
teeth than 1st gear. As a consequence, the pinion shaft will rotate faster than the previous speed.
Similarly by shifting gear coupler (10) to left pinion shaft is driven by 3rd gear (6) via range shaft and by shifting to
right pinion shaft is driven by 4th gear (7) via range shaft and speed of the pinion shaft varies according to the number
of teeth on the gears (6) and (7).
Range gear can be selected by shifting the range gear coupler (11) to left or right. For getting high range, shifting
coupler to left engages cluster gear directly to pinion shaft and pinion shaft receives the rotation from any one of the
gears 1st, 2nd, 3rd and 4th depending on the position of gear couplers (9) and (10) through driven shaft (16) and
range shaft (2).
For low gear range coupler (11) have to be shifted to right and pinion shaft receives rotation via driven shaft (16) and
range shaft (2). Since gear (12) has less number of gears teeth, as a consequence, the pinion shaft will rotate slower
than high range.
For high gear range coupler (11) have to be shifted to the left and pinion shaft receives a rotation directly from driven
shaft (16).
For engaging reverse gear, shift reverse gear fork to right, power flow is from input shaft via drive shaft to reverse
drive (14) gear (18) acts as intermediate gear between reverse drive gear (14) and reverse gear (13) and changes the
direction of rotation of pinion shaft. Depending on the position of range gear coupler (11) high reverse or low reverse
are obtained.
Transmission - Mechanical transmission
GNIL14TR04107FB
E
H
L
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3
PTO 540
High
Low