Fiat 411 R User manual

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SEEWEE NEMQQM,
Service nenartmeni
Via Canap,;;1,3 - 8tupinigi A- Torino (Rely)
Fm.-n ED3_5d.5B~3 - Aprfl, {Q63 .. 2000 ~ 5. A.N. - ‘Fcrino
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TRANSMISSION ASSEMBLIES
CLUTCH
The master clutch assembly is composed oi two dry, single-plate clutches, one for the tractor transmission
drive and the other for the power-take-off drive.
The unit is controlled by one single pedal which, during the first part of its travel, disengeges ihe main
clutch (transmission) and En the following one, the power-take-off, but only when this attachment is
directly driven by the engine (independent powewtake-oh).
The three diagranns of Fig. 82 illustrate, respectively:
a) the clutch engaged; ii) the main clutch disengaged; 0} clutch completely disengaged.
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Fig. 82. - Clutch functional diagram.
a - engaged clutch. b A main clutch. disengaged. c - clutch, completely disengaged.
F we Power take-off dm-en plate - C = Gearbox driven plate - P = Lever points.
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Removal and stripping of clutch.
Removing the clutch assembly from tractor:
Paris to be removed. Operations and cauiions.
The batteries.
The exhaust pine.
The engine, with the front axle (Fig. 83}. '
Disconnect the following components:
‘ »~— the hydraulic pump oil lines, the steering shaft
lever longitudinal iie~rod, the board‘ from the bailery
support and this support from the gearbox case, the
accelerator pedal fife-rod from the transmission shaft;
the electric cables central connection;
~»— firf two‘ wooden wedges on the froni axle, attach
the engine assembly to a lift and place the gear-
box case on a stand;
¢— remove the screws assembling the engine to the
gearbox and facilitate {he removal by acfuatlng
the clutch pedal. "
Nofie. - To pull the flywheel inner pllol bearing
use fool A 619827.
Fig. B3. - Removal of engine, with front axle.
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=1 Si’ in of clutch cm device A “I'HOE3fA Fig. 85. - Fro
nt view of a tie-rod and oriemaiion of
Fig. a - ‘i "pp Q I i elastic pins
A. Disengagemeni {ever adjustment nuts - 1. Elastic pins
2. Lever pivots - 3. Forks - 4. Fork adiusfing nuis.
Stripping of ciuirchz
Inspection of clutch dismantled parts.
(See the last figure for references).
Mount ciuich on fixfure A 711063 or on fixture
A 711063_lA, remove the elastic pins (1, Fig. 84) and
push out the disengagement lever pivot pins (2).
By siackening the siua‘ boffs fasiening the cluich £0
fixture, a1! parts become free.
If the clevises (3) must be removed urzscrew them
from the pressure plate after slackening the adjusting
nuis (4).
Check the oiutch components as follows. according to the data of fable at page S7:
- check condition of friction linings and of metai surfaces contacting them; ii necessary smooth them.
- I‘ nd surface brushing are
lf the rings are soaked with oii, replace them, as washing in Q0150 me a
insufficient;
-— check cléarance between the clutch driven disk hub teeth and splined shafis;
-— check the throvwout bearing, and the clutch shaft piiot bearing, located in the flywheei;
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- check ciearance between bushes and disengagement lever pins;
- check piate spring characteristics;
- check the throw-out coiiar working siiding surface. If wear does not exceed the permissible iimiis.
the shaft can be mounted again after rotating it ‘i8G°; if necessary replace the parts when grease
I drips due to excessive clearance.
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‘ Assembling and adiusting the cluich.
1_;_,i;,;i¢a1§Qn_ Smear iighiiy the foiiowing oomponenis before
ii assembling using quaiity chassis grease:
— the clutch disengagement lever pivots, the cievis
ends confaciing the disengagement fevers (3.
Fig. 34), the c1uZcn~gearb-ox and the clutch power
* iaise-off shaft splines, the baii ends of push
levers (P, Fig. 88), the ciei/is fever ends where
confaciing the disengagement collar; in addition
service the bearing housing in engine fiywneei.
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, Fig. 83. - Clutch piaie centering with reference to points P.
} Assembling the ciutch components. it is easiiy performed by foiiowfng Figs. 86 and 8?
' and caring that the ciuich-gearbox piate is centered
i with reference to the caps and that the eiasific pins
are oriented as shown in Fig. 35.
Clutch assembly £0 be performed on fixture A 711063,
using if on the side marked with the tractor number.
For clutch adjustment ii is noi necessary io place
upon the fixture A 'I11i}63 the power take-off disc,
which remains outside the assernbiy, and is subsu-
iuted by a ring (Fig. 89) superposed to fixture E.
Ciutch adiustment.
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Ctutch adjustments should be made as follows:
G H .-s
E - D v__,, /____ 33 a) adjustment of the complanarily 0;’ the clutch
ll Q’ _ disengagement three lever ends. The adjustment
1,1 to be made according the Fig. 89 :'.e., by checking,
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Fig. 89. - Clutch adjusiment using fixture A 711863
5,6,1»-I Fixture cornpcnenis - D Spacer bearing No. M1 R,
used also for other wheel types belonging to fihe series 490.
Clutch contro! adiusirneni.
Assembiy of clutch on engine.
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Fig. Q0. - Clutch adjustmeni on engine, using ioul
A 11'£fi63, complete.
B Clearance €,5-2 mm (0.059!-0.078‘? in.).
56 ‘
using feeler gauge, that between the lever ends
and the checking elements laid upon the spacer
there is a max clearance of 0,1 mm (0.0039”);
a different clearance requires to unscrew the
fastening nut and adjusting the proper screw.
Mote. - lfclutch is installed on fixture A 'l1‘l063lA.
the adjustment may be made after the assembly on
the tractsr, using fixture A 117683 provided with a
suitable flange (Fig. 96).
in->
b) Adjust the clearance (E, Fig, QB} of the power
lake~off pressure plate clevis. Check that clear-
ance be 1.5 to 2 mm (0.059'l"' to 0.0787"), and
if different, unscrew the loclmui and screw on
or unscrew the sleeve. The clearance adjustment
may also be made when the clutch is mounted
on the tractor through the gearbox side cover.
The free travel of the clutch pedal is 25 to 35 mm
M19843" to 7.37190" ). Plate wear, however, decreases
fine free travel. Unscrew the pedal lie-rod clevis as
much as n€cessa1'y to reestablish the previous value.
The centering oflhe assembly on the engine flywheel
is facilitated by using fixture A 117083 (Fig. 91) that
may also be used for the disengagement levers
adjustment, when tilted with the proper plate (Fig. 90).
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FLEXIBLE COUPLING BETWEEN CLUTCH SHAFT AND GEARBOX
Noisy transmission.
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' shafts.
CLUTCH COMPONENTS: SPECIFICATEONS, ASSEMBLY CLEARANCES
Calls for the dismantling of the elastic coupling to
check the rubber block e;‘i‘7ciancy,' if blocks have
excesslve wear, replace them.
When reassembling ascertain the correct function-
ing by locating coupling and shaft splines correctly
according ihe drawing of Fig. 92, in addition iighien
the fastening bolts of {he flanges to a torque of
2,5 kgm (18 ff./la).
AN D PERM1SS1BLE WEAR
. Wear iimits
I e ce mm .
Assemby cl aran s In mm m,
Between wheel drive splinad shaft and its disc
Between powe: take-off clutch spiined shaft
and its disc . , . . . . . . . . . . . . . .
Between wheei""drive shfiaftvspline flanks and
€1exib!ejoim': collar . . . . . . . . . . . . .
Setween disengagement lever bushes and their
glns . . . . . . ._ . . . . . . , . . . . . .
Between shaft and ciuich throw-out collar .
0,010 to 0,105 0.0004 to 0.0042
0,013 To 0,115 0.0005 to 0.0045
-0,024 ‘£0 -0,072 -0.0809 in -0.0028
0,613 to 0,064 CLOUDS to l3.fiG25
0,930 to 0,145 0.8912 to 0.005?
0,35
0,35
0.20
0,30
0,30
0.6138
0.0138
0.0079
0.0113
0.9118
Clutch driven disc thickness (wheel drive and
power take-off), complete whh friction fining
B,6
0.3386 T
0.2755
Tightening torque for flexibie coupling flange
nuts (Fig. 92) . . . . . . . . . . . . . . .
2.5 kgm 18 ft.Ib
Clutch spring speciiiazafions
Spring free length . . . . . . . . . . . . . . . . . ... . . . . . . . . . 65.? mm (26024 in)
Spring {ength under check load . , . . . . . . . . , . . . . . . . . . . . 45.2 mm (£3795 in)
Check load . . - . . . . . . . . . . . . . . . . . . . . . . 112,810 124,6 kg (248.7 to 2':'4',7 lb)
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GEARBOX AND EPECYCLKC REDUCTION GEAR
Dismantling - Stripping of components.
Remove the gearbox from tractor as toilows:
Pgrts to be disassembled.
The engine, with its from axle.
The steering box.
The two foot-boards, the rear temps cable and
the dutch disengagement tie-rods.
Operations and cautions.
Follow the sequence described on page 53 for the
main clutch removal.
if the tractor is provided with oil lines rfiihning from
the hydraufic pump to the lift, remove them.
The stripping of gearbox components is ’§aci§itaied by instaiiing it on the rotary stand ARR 2284 (Fig. 93).
The centrai clutch shaft and the throw-out collar.
The gearbox and the epicyciic reduction gear
shifter rods. r
"-.:—--.
Remove the two screws fastening the clutch throw-
out collar .5UppOI"i to the gearbox, and remove it
together with the engine clutch shaft and the fie-xI'bie
coupling.
Remove the gearbox cover with the shift lever;
remove the shifter forks, after puliing the fastening
pins, beginning from the central rod (2, Fig. 95);
siide out the reduction gear control sleeve with
shifter forks and rods;
take away the 3 springs {Section C-C, fig. 108) and
the detent balls.
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Fi . Q4. - Removal of gearbox casing from tractor.
Fig. 93. - Gearbox casing mounted an rotary stand Q
ARR 2204.
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Fig. 95. - Upper view of gearbox control gears and shifter
forks.
1. Shifter forks for 1st, 4th gears and reverse - 2. Epicyclic
reduction gear control fork - 3. Shili fork controlling 2nd and
5th, 3rd and Sih gears.
Primary shalt.
Reverse gear and its shaft.
Secondary shaft.
-04-.
Fig. 96. - Disassembly of primary shaft.
(Arrows show the wooden wedge and lhe punch).
Note. - When also {he secondary shaft is to be
disassembled, engage lwo gears in order to unscrew
the fronf end fasrfening nut.
Take away the primary shaft front cover and remove
the shafé by hammering on rear end.
Prevenl the rear bearing from coming off together
with the shaft by placing a w0oo’en wedge as shown
in Fig. 98.
lf necessary pull out the hearing also using punch
A 9613703.
Remove the slop and slide out the shaft together
wifh ihe gear.
Should fhe shall‘ removal offer some dlfiiculty, apply
a screw to the threaded hole in the axle.
Remove bush from gear using the punch A 928251.
Remove ihe epicycllc reducllon unit and fhe gearbox
wall lnner thrust disc;
slide out the secondary shafl with a bronze punch
hammering ll on its front end.
Checking the stripped out components of the gearbox and epicyclic reduction gear.
Check gearbox and eplcycllc reduction gear components against specifications of page 63.
Neither gear teeth nor chamfered surfaces should he damaged.
Check if the teeth of mating gears are working on the whole face length, and if the surfaces are smooth
and free from signs of scoring or hammering.
The sliding gear hub internal splines should be free from marks 0% wear or seizing, and ali splines should
have their corners without signs of hammering.
The splined primary shaft should be absolutely free from pitting or scoring. especially on gear sliding sur-
faces. Slide the gears on the shaft and check for clearance between the gear guide flanks and the cor-
responding shaft spline flanks.
59
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Fig. 9'1. - Gearbox and epicyciic reduction gear parts.
62
1. Clutch~ge-arbox coupling - 2. Cover gasket - 3. Primafy shaft from
bearing - 4. 1st speed and 4th speed gear ~ S. 2nd and 5th, 3rd and 5th
'~ ff 1
speed gears ~ 6. Primary shaft rear bearing - 7. Reverse gear mounted Q 1 ...;._;,;
on its shaft - B. Secondary shaft bearing retainer ring - Q. Secondary ‘“" ‘l §i:.,_W.;;..,c%-: __
shat? front bearing - 19. 1st and 4th speed driven gear - 1?. Srd and 20 J ir 5;=e?;i;"~:
6th speed and reverse driven gear - 12. 2nd and 5th speed driven gear -
13. Secondary she'll rear bearing - 14. Thrust ring -15. Epicyclic reduc- e__
lion fixed gear - 16. Thrust outer plate - 17. Epicyciic reduction driven ®/
gears -18. Shim rings -19. Reduction gear engagement sleeve- 20. Driver. j
gear shims - 21. Stop ring for pivots - 22. Driven gear axle rollers. i
Note: Starting from chassis No. #27935 helical teeth have been super-
seded by straight teeth.
The reverse shaft should be smooth and without scoring; it the permissible clearance between the hush
titted on the gear and its shaft is in excess of the wear limits, replace both bush and shah.
The bail bearings should be perfectly smooth in operation, without clatter. The epicyclical reduction
driven gears roller bearings and those for the bevel pinion shaft should have an assembly clearance not
exceeding the value listed at page 63 and the surfaces mating such components should not be damaged
in any way.
The gear control forks should be checked for deformation and hardening characteristics of the working
surfaces. They should slide freely with shifter rods in the box guide holes.
Replace gaskets whenever worn or damaged.
The epicyclicai reduction gear thrust rings should be checked and it presenting signs of wear should be
replaced.
At gearbox major overhaul, remove the control lever sector plate, located under the cover (Fig. 98), in
order to check its components efficiency, especially the ratchet (3) and the control lever dowels £1},
which are subject to wear.
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Fig. 93. - Gear shift lever. Fig. 99. - Assembling of epicyclic reducfion gear on
gearbox secondary shaft.
1. Control lever doweis - 2. Sector plate fastening screws - 6. Primary shaft rear bearing - 14. Shim _ R = Reverse Bea,-
3. Gear selector pivot ratchet. shaft » V = Shim pin,
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To reassembfe geaubox components proceed as roiiowsz
Paris to be assembled
S-=cond=ry shaft
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Operations and cautions.
Assembfe on the shaft the rear ball bearing after
heating ii in an oil bath to a lernperature 01‘ 80° C.
&ppr0X.,'
install in éhe gearbox fhe front bearing after sfiding
in the shaft from the box rear end, and mount on
it the gears according to Fig. 97.
Note. — The shaft nut tightening sjmuid 59
made after the insfaliafic-n of the primary shaff, as
if could be facilitated by meshing two gears af the
same time.
If the bush has been replaced, after reassembfy it
must be reamed using reamer U 8321, up to the
dimension of page 53.
Fasfen fire reverse shaft (R) as shown in 1~'ig.9B.
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1!-21’-31 I-2 3 a e |ndxcat|ng respectively ‘ls’: End, 3rd 4th 5th and Bth speed, obtained by the displacement of the epicycfic
§'%dLECtiUfl gear sieeve according to the a row lZ!H'ECfiOi"l indicated by r or opposite tn 5:,
Ra Taper ro¥l r bearmg adjustment shims Rb Rmg for centering the pinion on bevel ring gear ~ Section C-C ihmugh
CGSIFQ fflrward wail, ar'd correspondmg to tne control rod - As Rod - Sf. Balls - Mm Bali sprin ~ b. R r '
95 eve se gear sechon.
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(Note: Skirting from chassis No. 427935 up helical teeth have been superseded by straight teeth).
Epfcyciical reduction gear (Fig. 191}.
Primary shaft.
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Rods and forks for the gear contra! (Fig. 95).
é_ {_X F
Fig. ‘I63. - Orientafion of the various spring pin cuts with
reference io direction of force (F) or of rotation.
Gearbox cover with control lever (Fig. 93}.
62
Assemble the epicyclic reduction gear c0m,00fl8niS
according to Fig. 101.
Mount on the gearbox the primary shafi rear bearing
{6} and fasten by its pin (V), the inner thrust disc
(14), having its lubrication passages Iocéied as in
Fig. 99.
Mount on shaff front end the bearing, the oil baffle
and the efasiic rings;
slide-in the shafi from the case front side and fit
on it the first, second and third speed gears;
mount the primary and secondary shafts front Covers
and their gaskeis.
When mounting the first cover, slide if on fixture
A 137003 which avoids the oil sea! gasket being
damaged by the primary shaft splines Confacf
(Fig. 102).
Fig. 102. - Mounting ihe primary shaft front cover using
too? A 137803.
Introduce through the gearbox wall holes the three
detenf springs and mount the ball and the first
gear shifter rod with its spacer and fork;
introduce through the waif middfe no/e ihe two
epfcyciic reduction gear control roe‘ check belfs (see
diagram C-C, Fig. 106) and compleie the assembfy by
infroducing {he two balls from the reievamf hole and
rnoum.‘ ihe rod, ine spacer and fork aciuaiing the
second and the third gears.
Note. - The cuts of the p:'ns fastening forks io
rods should be oriented so thaf the strain expand ihe
pins in their holes (Fig. 183).
Mount the lever and the two dowels in the cover
and add the cap and snap ring;
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mount to fhe co-/er lower section the sector pia-fie and
fasten it wiih the two screws (2, Fig. 93); mount
also the gear selector pivot (3).
Before mounting ihe cover, shift in neufrai all gears.
Mount on gearbox-clutch contra! shaft, the flexible
joint, the suppcri, the bearing, and its disengagement
s/eeve.
Gearbox-ctufich control shaft.
Before mounting all parts on the primary shaft, be
sure that the sea! ring is 1'nsz‘afied (Fig, 97),
NOTE: Shift the gear shift fever backwards, thus disengaging the reduction gear, in order to faciiitate
the operation of fastening the gearbox to the transmission casing.
GEARBOX AND EPKCYCUCAL REDUUHON GEAR COMPONENTS:
SPEGFICATIONS, ASSEMBLY CLEARANCES AND PERMESIBLE WEAR
, Wear
Bat? _ Assembly ciaaranhes T mm (In) limits
‘ mm (In) ' mm (in)
Between gearbox shaft ‘ 0,010 to 0,105 0,35
splines and their driving - {Q0004 to 0.0042) (03133)
and driven gears ,
Beiween gearbox driving w 0,10 to 0,20 0,50
3 and driven gear toath flanks , (Q0039 to 0.0079) (O-.0197)
i Between driver: gear pinion . _ W
‘ tooth flanks and the flanks _ 0.07 to 0,13 2 0,35
1 1 of epicyclicai fixad redu<:- (Q0028 to 0.0051) ’ (Q9135) ‘
: tion gear j E
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Epicyciical reduction driven gear ; 20,41to20,¢3 ,
needie seat diameter § 10.5035 to 0.8043) Y
1 , 0,01 m one 2 or
j Epyciclicaf reduction driven gear 2.99 10 3-9° 1 8e‘W?en ‘?°“°HB$ an?‘ axie?’ 5 (M004 to 0,0024) ’ (0.0'0§9)
need,“ éiamaiel. _ (91177 to 93131) of eprcychcai reductlun dr|-
, ‘“ ' Q ven gearS
E-Ipicyciicai reduction driven gears axis 14,-$00 to 14,389 I
diameter (05669 to 0.5665) _
I
Reverse shaft bush inner diameier 25,065 to 25,098 _.
{obtained by accurate tapping) 5 (£19868 to 0-9881) _
= - Between bush inner diam- 1; 0,065 to 0,119 0,30 ,
WV ""”""W WW Z" 1"" gr 7”" 777‘ Bier 9-fld H5 F9‘/9l'$9 5115“ ! (919925 £0 Q0947) . (Q0118)
Reverse shaft diameter = 25,000 to 24.979 E '
1 (09842 to 0.921.243 ; V
_ 7_ I '__ _____ ___ ___ , _ ____"
ii
5 Control rods release spring Gearbox seieciion release springs
g 1
Spring free Iength _ _ , , , _ , , _ _ _ 36,5 mm (14370 in) ‘ Spring free length . . . . . . . . . 21,2 mm (0.8-345 in)
Spring length under check load . . . . 31,5 mm (1.24CI2in] , Spring length under check Toad . . . 16,5 mm (£16495 in)
Check iuad . . . . . . . . . 14,710 15,3 kg {32,4 to 35.9 Ib) Check load _ . . . ‘ . . . {SA to 20,4 kg [40,6 to 45 lb) ,
1
63
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4-=-*-N-.¢=-,.~v?~.-HM-M-.,wM._i..

BiFFERENT!AL AND LGCK
The rear half of the tractor body is a case housing the differential assembly and its lock; it is closed
at the rear by a cover through which the power take-off shaft projects; the belt pulley unit may be attached
There/:0.
The case upper opening allows the fitting and removal of the power take-ofi drive and driven gears.
5'!-N-',a1'.'*=‘=-"""“""“""“"' ‘ _
Fig. 104. - Removal of engine and gearbox from rear
transmission casing.
Disassembly.
To remove the differential case from tractor and
Paris to be removed.
The hydraulic lift.
Drain lubrication oil.
The gearbox from the dii-Ierential case (Fig. 10¢}.
The final drives (Fig. 195).
The soar.
The transmission case rear cover (Fig. 165).
64 l
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Fig. 105. - Transmission casing rear cover removal.
to dismantle it, proceed as follows:
Operations and cautions.
Remove, if installed, ihe /lfl unit, its oil lines, and
the implement hitch.
Remove the two plugs found under the tractor body.
Disconnect the rear light cable connection.
Place the differential casing on a stand and lift the
gearbox with a winch; remove bolts connecting such
two components and disconnect them by a lever.
Remoi/e the rear wheels and their discs.
To help the disassembly ofthe various units, remove
the mudguarcls.
The seat should be removed lo facilitate the oper-
ations which follow.
Remove the dlfierenlial case upper cover and sei
the power fake-off control levers at the position
<< MOTORE n (engine).
Unscrew the rear cover fastening screws and remove
the cover by pulling and lowering it very slowly, {'0
allow the removal of the front bearing of the power
take-off shaft from its housing.
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Fig. 106. - Transmission casing mounied on rotary stand
ARR 2204.
The differential iock controi.
Differential gear Casing supports.
MNWWWEYMM
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Fig. 167. - Lock conirol spring mounting using tool
A 237033.
(OFI WP. the spring is represented before assembiy (A) and
after assernbiy (B) on the tool).
At the same time, remove from the upper opening the
gear which is thus free from the shaft’ end, to avoid
damages from its faffing in the box,
Note. - To easify disengage the rear cover from
the transmission casing, set the power take-Off
engagement fever in the <1/VIOTORE» (engine)
posiiion.
To inspect or rep/ace parts remove the rear cover,
ihe pedai compiete of aiiachmeni, the plug from the
shafi /eff end, in order to make ii possibfe ham-
mering it out from fhe right side.
Fasfen the casing on support ARR 222$, mounieo‘
on rotary stand ARR 2204 (Fig. 106).
Remove {he gear casing supports and remove the
bevel gear, complete.
if ihe difiereniiai casing inner bearing races have to
be removed, use puller A 537105.
—, .1_ Q V
‘__;;._¢:>k~_*__—:;‘ iii-_:r?;1i;;;;;:';;~$_‘
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Fig. 108. - Beve! ring gear assembly with differeniiai.
1. Differential lock.
65
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Fig. $59. - Rear iransmission components.
1. Differential loci. - 2. Power take-off driving gear - Ra. Bevel pinion roller-bearing adjustment shims - Rb. Ring for centering
bevel pinion on ring gear ~ Re, Ring gear adjustment shims.
Unscrew the beve! pinion shaft fastening nut using
wrenches A 711109 and A 611108 and stopping
the rotation with the brass hammer A B61322.
Remove the shaft by applying a bronze punch upon
ifs front end, and hammer it out.
The power £ake~ofi' driven gear and the spacer are
removed from the casing upper opening after setting
ihe power taI<e»off engagement lever in the position
marked << CAMBIO » (gearbox).
The bevel pinion.
inspection of the stripped components of the differential casing and differential lock.
Accurately clean all stripped out components and check if the gear meshing surfaces are in good con-
clitionsi
»— check the diiferentiai gear thrust rings, and the pinion bushes and thrust bearings vs. ihe wear limits
oi page 59. When replacing bushes, after assembly, ream with expanding blade {earner U 6‘lf814
to achieve the prescribed clearance;
-— check the copper lining on crown wheel hubs. and replace such parts if the coating is not sufficient;
- check the taper roller bearing and the differential axles oil seals;
— check the difierenfial lock collar working suriace and the pin fastening. Check the differential lock
control spring (Fig. 107) by a comparison of its characteristics with {he specifications on page 69.
D iffereniial casing asse mbiy.
See Figs.1H9 and 118 and in addition bear in mind ihatz
- the planetary casing is secured to the be-vei gear by bolts fastened to a torque of 4.5 to 5 kgm (32 to
36 it.lb);
—~ the differential. pinion axle is held in place by two special head bolts, the same which secure the
casing is the bevel ring gear;
66
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— the assembly of the taper roller bearing inner
* races on the casing should be made after
heating the bearings in an oil bath ‘co a tem-
perature of 80° to 90° C; the same procedure
5 applies to two bearings and to the power take-
off driving gear, on the bevel pinion shait (2,
_; Fig. 109);
- -.._>...i.4_=........ ...
~— the differential lock control spring is installed
" as shown by the Fig.10'I, using tool A 23"i'lI}33.
To facilitate the reassembling of the differential
case to the gearbox, we suggest placing very near
I to the shaft {Font ends -— by manoeuvering the
l relevant levers —— ihe power ts5<e~0fi driven gear
Bevel pinion and ring gear adiustmeni.
lowed:
a) bevel pinion shaft bearing adiuslment;
1 b) differential case bearing adjustment;
‘ c) tooth bearing adjustment;
cl} tooth backlash adjustment.
l The sequence of operations is as follows:
al lr:-stall the bevel pinion shaft and its bearing,
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Fig. 1113. - Rear transmission sectional view.
R: 7 Ring gear shaft adjusirnent shims - a = Drive wheel
shaft and spacer, up io iracior no. 4-33¢S5§.
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Fig. ‘E11. - Bevel pinion and gear correct tooth hearing.
and the reduction gear engagement sieeve.
When chécking or replacing the bevel pinion and gear, the following adjustmeni sequence should be iol~
the power take-off driving gear, the spacer and the
adjustment shims Ra (Fig. 106}. To calculate the shim thickness, subtract from 58,5 to 59,5 mm
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Fig. 112. - Rear view of tool A ‘£37010 for bevel pinion
and gear adjustment.
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Fig. ‘H3. - Right view of ‘cool A €376€’0 for beyel pinion
and gear adjustment,
(2.362? to 2.342") the sun": of the gear width and the spacer width. Finally, check the shalt tor tree
rotation and mount in place of the foregoing shims others having their total thickness minus 6,05 mm
(0.G{J2”), which will set a 50 ltgimm (ill) lb} pre-load on the pinion bearings.
b) Remove the bevel pinion and mount the bevel gear complete with differential pinions and supports;
tighten one of the pinions with its screw and check with a teeter gauge, at the other support, the
overhaul thickness of the bevel roller bearing shim rings. Divide it by two placing each ct’ the two
halves Rc on the two supports and check it rotation is tree but without end"piay.
c) For a correct tooth bearing (Fig. 111) pay attention, at pinion assembly, to the number stamped upon
the smaller base and marl-ted by -+~ or —~; this is C§Ul’E8* necessary to determine that thickness ot ring Rh,
which will be most tit to avoid noises during operation.
We suggest the following sequence:
»- mount the bevel pinion shaft titted with all its parts and with a ring Rb oi any thickness;
— mount on the casing the tool A 133110, according to Figs. ‘E12 and 113;
—- rotate the tool shalt clockwise so that the eccentric zone contacts the pinion base, and read on
the quadrant graduated from 92 to 94 mm £3.62?’ to 3.700”) the value at which rotation stops. it this
value, indicated on the quadrant, exceeds the one calculated by adding or subtracting from the
theoretical distance existing between the pinion smaller base and the bevel gear axis (93 mm - 3.661”)
the number marlzed on the pinion (not proceeded by any letter mark}, it will be necessary to replace‘
ring Rb.
The ring to be mounted should have a thickness increased of an amount equal to the difference
between the two values.
On the contrary, it the value read on quadrant results less than the one read on the pinion after
adding or subtracting (accotding to the + or M sign) from 93 mm (3.6614”), the thickness Rb should
be decreased.
Reading on the fool quadrant 93.-1 mm
Measure read on the pinion ~{~ 0.2 mm
Example No. 7.
Distance between pinion and bevel gear:
93 + 0.2 = 93. 2 mm ($6614 -i— 0.0978 = 3.5692”)
The ring Rb should be 0,2 mm thicker than the one
installed, calculated by subtracting 93.4-93.2=
0,2 mm in order to set the pinion at a distance of
93.2 mm according to the indication marked on ii.
68

Reading on the tool quadrant 92.6 mm
Measure read on the pinion —0,3 mm
Distance befween pinion and bevel gear:
93 —~ 0,3 = 92,? mm.
The ring Rb should be 0,1 mm thinner {ham the one
insta/fed, caicu/aied by subtracting 92,7 -— 92,6 =
== 0,1 mm.
Exampfe No. 2.
d) Check with a dial gauge the tooth backlash which shouid be 0,20 mm (U.O08”J; the correct backlash
can be obtained by shifting adjusting shims Rc from one support to the other, in order ta set the
bevel gear farther or nearer the pinion as required. The overhaul thickness, determined according to
paragraph b} should not be aitered.
SPECIHCATIONS, ASSEMBLY CLEARANCES AND PERMISSHBLE
WEAR OF THE DEFFERENTIAL COMPONENTS
Wear iimits 5 Wearlimits
. Assembiy clearances mm :1 (in) mm 1 (in)
i
(0.008) 1
(0.unc4 to 0.0042)
(00059)
(00008 to 0.0037) \
(00031 to 0.0052) .
(0.004? to 0.6697)
1 Between pinion and crown whee! taeth backlash . . 0,20
Beiween splines of differential axles and their gears . 0,010 te 0,105
Diiferentiaipinion and geartoeih backlash . . . . . . 0,15
i Between bushes and differential pinion axle . . . . 0,020ia 0,093
‘ Between casing and differential gears . . . . . . . 0,030 to 0,153
Beiween differential lock coiiar and casing . . . . . - {}_120{¢0,245
0,4 i
0,5
0,25
o.ss
0,5
(0.015?)
(0.019?)
{0.0E]98)
(011133)
(0.0? 9?)
Specificaticns i mm (i rs}
‘ Crown wheel adjustment ring s!1im)thicknesS (Ra, . ‘
_.
_—‘3
-Ii-U1 r-0-I-P
O0 -1-A
(DU!
NI O1
‘ Differential gear ihrust ring thickness (1) . . . . .
‘ Differential pinion round thrust washer thickness .
i - .
i :
I
e.1s§n (i 0.0008} .
{i 0.0004)
0.0531 E0 0.6509
0.0551 fo 0.0536
3 Fig-1103 - - ~ - - - - - - . - . . . . . . . . i 0,3-0,5-0.7 (toier. -30,02) 0.011s-c.0197-0.0215(=1-_a.0ooa>
1 Bevéi pinion sifiiii adjustment shim ticim:-ass (between Q 3,g.3!g.¢.4,1.4,g.4_3-4,4.4,5..4,5- . g_1495-0,;535_g_1575_g_15q4_g_1554_
Biniw and fear fairer bearing) - - - - - - - - - - 4,?-¢,s (toiar. :1: 0,02) 1 0.1693-0.1732-0.1772-a.1a11-u.sa59-
1 Beveipifliw shaiibearins adiustmentshim pa¢kihi¢i<- ij 1,1-1.754,s-as-2-2,1-2,2-2,25-2,3 0.0569-0.05894:.07u9-o.o'14s~o.0?s7-\
‘ mess - - - - - - - - - ‘ ~ - - - ‘ - - - - - - - - § (toler. $0.01) . 0.0827-0.0866-0.0386-nneoe .
1 Tightening torqué of bolts assernbiing pianetary gear ‘
casing to crown wheel . . . . . . . . . . . . . . 4.5 Y0 5 F4901 ,
32' to 36 ftib
i Differential ¥ock control fork spring ‘
Spring free ienth . . . . . . _ _ . . . . . . . . . . 188
‘ Spring length under check ioad . . . . . . . . . . 126,5
. Check load . . . . . . . . . . . . . . . . . . . . . 28.5 to 31,5 ks ‘
7.4036
4.9803
62,8 to 69,4
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_, _ H ,_;.,__f_. _ » ,_ » _., .._.. V____ .. _________[
(1) Rings of oversized thickness of 0.1 mm (00039 in) are avaiiabie. Wear iimii of a shim: 1 mm (00394 in).
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FINAL BRIVES
f ha ‘n individual casings, mounied lateraiiy to the differential and driven
Each consists of a pair O gems VI Q
by it (Fig. 110).
Final drive overhaul.
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The majsr overhaul thereof should be made as .0 ows:
Removal from tracter (Fig. 114).
Shipping out of components.
Fig. 114. - Removal of final drive casing from tractor.
YO
Remove the electricai cabfe energizing the rear
lighting from connection, and take ihe mudguard
away;
place the transmission casing on fhe stands and
remove the whee! assembiy, with disc and fire.
Remove the final drive casings frcm the tractor and
null outwards to slide out the difierenfiai axle from
bevel gear. .r
Mount fire assembiy on the roiary stand ARR 2284
with support ARR 2221, and remove the brake drum
fasfening nut.‘
Remove the drum using a universai puiler (Fig. 115};
remove boih finaf drive casing cover and driven
gears;
remove the axie inner bearing stop ring {see Fig. 116)
and push it out the casing.
Note. - The final driven gear remova! does not
necessarily require removal of the casing from
tractor.
To unscrew the driven shaft nui of the final’ drive,
mount £00! A 137014 to stop gear roiaiion (Fig. 116);
ihen use a universal puffer provided with 2 screws
{diameter 15 MB, pitch 7,5 mm} (Fig. H7),
Fig. 115. - Removal of brake puiiey using the universai
puller.
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