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TRANSMISSION ASSEMBLIES

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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. €l¢i{}[$£t_ ‘

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Fig. 85. - Fro elastic (See the last figurepins for references).

Fig. a - ‘i "pp Q I i A. Disengagemeni {ever adjustment nuts - 1. Elastic pins 2. Lever pivots - 3. Forks - 4. Fork adiusfing nuis.

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1 Mount ciuich on fixfure A 711063 or on fixture A 711063_lA, remove the elastic pins (1, Fig. 84) and

Stripping of ciuirchz

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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

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nuis (4). l

Inspection of clutch dismantled parts.

Check the oiutch components as follows. according to the data of fable at page S7: - them; I‘ surface smooth brushingthem. are - check condition of friction linings and of metai surfaces contacting iindnecessary 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

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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 assembling using quaiity chassis grease:

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— 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 baiifever endsends of where push levers (P,shaft Fig. splines, 88), the the ciei/is confaciing the disengagement collar; in addition

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service the bearing housing in engine fiywneei.

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Ctutch adjustments should be made as follows:

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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).

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Fig. 89. - Clutch adjusiment using fixture A 711863

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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.

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.

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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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Fig. Bi. - Mounting clutch on engine using tool 11 ‘.1'l0fi3. Fig. Q0. - Clutch adjustmeni on engine, using ioul

A 11'£fi63, complete.

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Clearance €,5-2 mm (0.059!-0.078‘? in.).

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FLEXIBLE COUPLING BETWEEN CLUTCH SHAFT AND GEARBOX Calls for the dismantling of the elastic coupling to check the rubber block e;‘i‘7ciancy,' if blocks have

Noisy transmission.

excesslve wear, replace them.

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the fastening bolts of {he flanges to a torque of 2,5 kgm (18 ff./la).

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When reassembling ascertain the correct functioning by locating coupling and shaft splines correctly according ihe drawing of Fig. 92, in addition iighien

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Fig. 52. - Diagram of flexible tolxpfing for clutch-gearbox ' shafts.

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CLUTCH COMPONENTS: SPECIFICATEONS, ASSEMBLY CLEARANCES AN D PERM1SS1BLE WEAR

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Between wheel drive splinad shaft and its disc

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Wear iimits mm

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0.0004 to 0.0042

0,35

0.6138

0.0005 to 0.0045

0,35

0.0138

-0.0809 in -0.0028

0.20

0.0079

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1: I 1:3‘ 1155 I

2‘?-; .. . LIE £2” II }

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

0,013 To 0,115

-0,024 ‘£0 -0,072

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glns . . . . . . ._ . . . . . . , . . . . . .

0,613 to 0,064

CLOUDS to l3.fiG25

0,30

0.0113

Between shaft and ciuich throw-out collar .

0,930 to 0,145

0.8912 to 0.005?

0,30

0.9118

Clutch driven disc thickness (wheel drive and power take-off), complete whh friction fining

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0.3386

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0.2755

Tightening torque for flexibie coupling flange nuts (Fig. 92) . . . . . . . . . . . . . . .

2.5 kgm

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18 ft.Ib I

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

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Dismantling - Stripping of components. Remove the gearbox from tractor as toilows:

Pgrts to be disassembled. The engine, with its from axle.

Operations and cautions. Follow the sequence described on page 53 for the

main clutch removal.

The steering box.

The two foot-boards, the rear temps cable and the dutch disengagement tie-rods.

if the tractor is provided with oil lines rfiihning from the hydraufic pump to the lift, remove them. I 5

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.

Remove the two screws fastening the clutch throwout collar .5UppOI"i to the gearbox, and remove it together with the engine clutch shaft and the fie-xI'bie coupling.

The gearbox and the epicyciic reduction gear shifter rods. r

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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Fig. 93. - Gear shift lever.

Fig. 99. - Assembling epicyclicshaft. reducfion gear on gearbox ofsecondary

1. Control lever doweis - 2. Sector plate fastening screws 3. Gear selector pivot ratchet.

6. Primary shaft rear bearing - 14. Shim _ R = Reverse Bea,shaft » V = Shim pin,

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Gearbox and eplcychc reduchon gear reassembly. To reassembfe geaubox components proceed as roiiowsz Paris to be assembled

Operations and cautions.

S-=cond=ry shaft

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. ,_ - - fiW_____.__.__

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Rods and forks for the gear contra! (Fig. 95).

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 é_

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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.

Fig. ‘I63. - Orientafion of the various spring pin cuts with reference io direction of force (F) or of rotation.

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).

Gearbox cover with control lever (Fig. 93}.

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

Gearbox-ctufich control shaft.

s/eeve.

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

Bat? mm (In)

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Assembly ciaaranhes

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Beiween gearbox driving w 0,10 to 0,20 3 and driven gear toath flanks , (Q0039 to 0.0079)

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heating the bearings in an oil bath ‘co a temperature of 80° to 90° C; the same procedure applies to two bearings and to the power takeoff driving gear, on the bevel pinion shait (2,

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~— the differential lock control spring is installed as shown by the Fig.10'I, using tool A 23"i'lI}33.

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Fig. ‘E11. - Bevel pinion and gear correct tooth hearing.

case to the gearbox, we suggest placing very near to the shaft {Font ends -— by manoeuvering the relevant levers —— ihe power ts5