P
aragraphs
1 76-1 81
GROUND SPEED GEARS
All Models So Equipped
176.
1b
remove ground speed drive
gear, driven gear (8-Fig. 165) and
bushing (9), ftrSt remove pto output. shall.
as
outlined in paragraph 175. Remove
hydraulic lift cover as outlined in
paragraph 207 or 206. Remove hydraulic
pump as outlined in paragraph 223 or
225. Remove retaining snap ring
(31-Fig. 155) and slide drive gear (30)
off bevel pinion shaft. Remove pto shift.
cover (4-Fig. 165), then slide driven gear
(8) forward out of bushing (9).
1b
renew driven gear bushing (9),
remove differential assembly as outlined
in paragraph 158. Drive bushing fonvard
from housing bore. Install new bushing
so front face of bushing is nush with in
ner end of chamfer in housing bore.
1b
reinstall gears, reverse the removal
procedure.
PTO MAIN DRIVE GEARS
All Models So Equipped
177. The pto main drive
gears
and
clutch
are
included in the transmission
drive train. Refer to appropriate
transmission and clutch sections for
removal and overhaul.
INDEPENDENT POWER TAKE-OFF
OPERATION
All Models So Equipped
178. Some tractors may be equipped
with an independent pto which
is
driven
by a nywheel mounted "Split 'Ibrque"
clutch and controlled by a hydraulical
ly actuated multiple disc clutch con
t
ained in differential housing. The pto
front drive shaft. is splined into hub of
the "Split 'Ibrque" clutch cover and turns
continuously when engine is running.
The pto control lever
is
mounted on
left-hand side of cover of differential
housing. Moving lever forward disen
gages the hydraulically actuated multi
ple disc clutch and engages the pto
brake. Moving lever rearward releases
the hydraulic brake and engages the
multiple disc pto clutch.
Hydraulic pressure to actuate the pto
clutch and brake is produced by the awc
iliary gear type pump which also pro
vides power for the Multi-Power clutch
and/or awciliary hydraulic system tf trac
tor is so equipped.
OUTPUT SHAFT
All Models So Equipped
179.
REMOVE AND REINSTALL.
'Ib remove output shaft (6-Fig.
166), first
drain oil from differential housing.
Remove shield and retainer plate (17)
from rear of housing. Withdraw shaft,
rear bearing and seal assembly
rearward
from housing.
Inspect all parts and renew as
necessary. Renewal of front needle bear
ing (7) requires splitting tractor and
removing pto clutch assembly as out
lined in paragraph 180.
70
'Ib
reinstall, reverse the removal pro
cedure. Lubricate oil seal lip and
"0''
ring before installing.
PTO CLUTCH UNIT
All Models So Equipped
180.
REMOVE AND REINSTALL.
'Ib remove the pto clutch and valve
assembly, ftrSt split tractor between
transmission housing and differential
housing and remove hydraulic pump
assembly
as
outlined in paragraph 223
or 225. Withdraw clutch unit from
dif.
Fig. 166-E�tploded view of
typlc•l pto output sh•ft end
essocleted p•rts used on
models equipped with In-
dependent pto.
I
Sh11l lever
2 Sh11l
cover
3 De�nl plunger
&
opr1 na
4 Sh11l
arm
6 "0" ring
6.
Output ahaf\
7 Bunng
8. Control valve spool
9
Sleeve
10 Clul<:h
II
Soap nng
12 Suring
13 Seel rel41ner
14 Me .. l ah1eld
16 0•1 aeal
16 "0" ring
17 RewMr pia�
18 Shal\ co'er
MASSEY -FERGUSON
ferential housing.
Reinstall
by reversing
the removal pro
cedure.
181.
OVERHAUL
1b
disassemble the
removed clutch and valve unit, proceed
as follows: Remove snap ring (16-Fig.
167) and thrust. washer (15), then
withdraw control valve housing (14) wilh
brake cylinder (20) from clutch housing
(11). Brake disc (12) is retained
to
clutch
housing by two pins (10). Unbolt. and
remove brake cylinder (20), piston (19)
and wear plate (17) from valve housing.
Remove snap rmg (1), retainer plate
(2), friction plates (3), wave springs (4)
and drive plates (5). Lift. out drive hub
(6). Remove piston (7) and seal rings (8
and 9).
Withdraw control valve spool assembly
(Fig. 168) from housing(8). Unseat inter
ns] snap ring
(5)
to
separate valve spool
(6) from plunger (2). Note that spacer
ball
(4)
is
available in different diameters
and is
used
to establish collapsed length
of control valve assembly. Recommend
ed valve length is 102
.
36-103
.
12 mm
(4.030-4.060 inches) measured as shown
at {L-Fig. 169).
Renew clutch plates and discs if they
are
excessively worn, distorted or show
signs of overheating. Measure free
height of wave springs with springs lay
ing on a nat surface. All springs should
be the same height. within 0.5
mm
(0.020
inch).
NOTE: New friction discs should be
soaked In clean transmission/hydraulic oil
for
30
minutes before I
ns
tall
a
tio
n.