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Date 12-06-2007
INTRODUCTION TO THE TECHNO VERSION OF THE REX SERIES
LANDINI has made the following modifications to the REX series so as to meet the demands from the
market with new and different specifications.
The current range has been updated with the addition of the REX orchard TECHNO version.
The proposal is a non-specific REX orchard tractor with basic characteristics at a competitive price.
The wide range with the three versions, GE, F and GT is still available, with the same engines.
The main modifications concern the following components:
6 3-point hitch 7 Instrument panel and steering wheel 8 Steps 9 Tyre combinations 10 Radiator core support
1 Front axle 2 LIMITED SLIP differential lock 3 Gearbox 4 P.T.O. with direct control 5 Hydraulic circuit
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1 ) FRONT AXLE ( Fig. 01 )
Fig. 01 Front axle
The self-locking multiple-plate differential uses the separation forces created between the teeth of
the planetary gears and crown wheels in order to produce the braking torque.
The braking effect, which is proportional to the torsional moment, is generated by two packs of
plates positioned symmetrically in the housing.
An increase in driving torque causes the separation forces between the teeth to vary, the result being
that these latter compress the plates.
The locking effect consequently increases thanks to the internal friction produced by the two clutch
assemblies, whose external plates are connected to the housing while the internal ones are connected
to the crown wheels so that they are unable to turn.
This effect opposes a well defined resistance to the axle shaft's different speed and torque conditions.
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Fig. 02 Torque flow when driving in a Fig. 03 Torque flow when driving
straight line around a bend
When the tractor is driven in a straight line ( Fig. 02 ) there is the same torque flow on both wheels.
There is the same wheel grip on the ground.
When the tractor is driven round a bend ( Fig. 03 ) the torque flow on the two wheels is different.
The wheels exercise a different grip on the ground.
T E = Input torque of the differential
T 1 = Left wheel torque T 2 = Right wheel torque
2 ) "LIMITED SLIP" DIFFERENTIAL LOCK
This is the differential commonly known as "Self-locking Differential with limited slip".
The multiple-plate self-locking differential uses an axial thrust that is generated between the meshed
teeth of the planetary gears and crown wheels of the differential.
The partial locking effect is proportional to the input torque ( kgm ) and is generated by two plate
assemblies installed between the crown wheels and the differential housing.
As the input torque increases, the thrust on the plates varies and increases the "braking" effect
between both the plates enbloc with the crown wheels and those enbloc with the differential
housing.
This effect creates a well defined resistance to the axle shaft's various different speed and torque
conditions. If the tractor is used on rugged ground, driven around bends or if one of the two wheels
tends to slip owing to lack of grip, the opposite wheel will still possess a torque generated by the
braking action of the plates.
This partial braking lock is proportional to the wheel grip of the wheel that slips.
T E T E
T 2 T 2
T 1 T 1
T 1 T 2
T 1 = T 2
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3 ) "SPEED FOUR" GEARBOX
The SPEED FOUR gearbox is based on a mechanical gearbox with 4 speed gears plus 3 ranges (Slow -
Normal - Fast).
The gearbox can be supplied with a Creeper, which adds another 4 ratios (speeds from 0.292 kph,
depending on the model and the type of tyres used).
Two gearboxes are available for the REX TECHNO series:
- Transmission with 12 forward speeds + 12 reverse speeds
4 speed gears and 3 ranges ( Slow - Normal - Fast) with synchronized reverse shuttle
- Transmission with 16 forward speeds + 16 reverse speeds
4 speed gears and 4 ranges ( Slow - Normal - Fast, plus Creeper on request) with synchronized
reverse shuttle.
The gear sequence covers a speed range of up to 36 kph (up to 30 kph for the 2WD version), using
420/70R28 rear tyres.
CONTROL LEVERS
Fig. 04 Gearshift levers
There are three transmission controls ( Fig.04 ) :
The transmission levers are all in convenient, ergonomic positions. Reverse shuttle with control on the left-hand side of the steering wheel, leaving the driver's right-hand free for other operations. The gearshift and range levers are on the driver's right where they cannot interfere with his movements.
1 Gearshift lever
3 Range lever
2 Reverse shuttle lever
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Gearshift lever ( 1 - Fig. 04 ) The lever can be set in four different positions ( Fig.5 ). The gears are all synchronized. To shift from one gear to the next in the same range, just disengage the main clutch without stopping the engine. Range lever ( 3 - Fig. 04 ) The lever can be set in four different positions ( Fig.06 ). The range positions correspond to the gating layout on the knob. Disengage the main clutch in order to shift from one range to the next.
Reverse shuttle lever ( 2 - Fig. 4 ) The lever on the left-hand side of the steering wheel ( Fig. 04 ) can be set in three positions ( Fig.07 ). Disengage the main clutch in order to engage the forward speed.
Fig. 05 Gearshift lever
Fig. 06 Range lever
Fig. 07 Reverse shuttle lever
A Forward B Neutral C - Reverse
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GROUND SPEED GRAPH
The graph shows the speeds of the basic SPEED FOUR gearbox divided amongst the four
ranges ( Creeper - Slow - Normal - Fast ).
The speeds are obtained with a 1500 RPM to 2200 RPM engine rate.
Fast
4
3
2
1
Normal
4
3
2
1
Slow
4
3
2
1
Creeper
4
3
2
1
0 5 10 15 20 25 30 35 40
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4 ) MECHANICAL POWER TAKE-OFF
Fig. 08 Engaging / disengaging lever
The main clutch - power take-off control lever has two positions ( Fig. 08 ):
- Position A - Power take-off engaged
- Position B - Power take-off disengaged
To disengage the P.T.O. clutch, push the lever down until it reaches the locking point.
To engage it, release the lever by pressing on the control on the actual lever ( Fig. 08 ), then pull
upwards.
5 ) AUXILIARY CONTROL VALVES
Fig. 09 Auxiliary control valves
P.T.O. lever
The basic machine has 1 standard single / double-acting auxiliary control valve. Further auxiliary control valves are available on request. The lever on the driver's right controls the control valve connected to two rear quick couplings of the Push-Pull type ( Fig. 09 )
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6 ) 3-POINT HITCH
Fig. 10 3-point hitch
7 ) INSTRUMENT PANEL AND STEERING WHEEL
Fig.11 Instrument panel and steering wheel
The steering wheel is fixed while the P.T.O. speed is analog.
REX TECHNO has a Class 2 3-point hitch with fixed ball-ends and mechanical top link ( Fig.10 ). The side stabilizers limit the side swing of the two lower links. The lifting capacity at the ball-ends is 2600 kg.
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8 ) STEPS
Fig. 12 Scaletta di salita
9 ) TYRE COMBINATIONS
To optimize the steering action, smaller front tyres are used than those of the STD version ( GT and F
version ).
The GE version maintains the current tyre combinations.
R60 F R70 F R75 F R80 F R85 F R95 F R105 F 5.00-15 12.4R24 Basic 6.00-16 13.6R24 Option 6.50-16 12.4R28 Option 6.00-16 360/70R24 Option 7.50-16 12.4R28 Option 6.00-16 380/70R24 Basic 7.50-16 13.6R28 Option Option Basic Basic 6.50-15 360/70R28 Option 7.50-16 12.4R28 Option 6.00-16 380/70R24 Basic Basic Basic 7.50-16 14.9R28 Option Option Option 6.00-16 14.9R24 Option Option Option Option 7.50-16 380/70R28 Option Option Option Option 6.50-16 360/70R28 Option
Steps on the operator's left, with generously
sized non-slip treads, make it easy to clean
mud and other residues from the shoes.
Their height makes it easy to climb on and off
the platform ( Fig.12 ).
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DT75 GT DT85 GT DT95 GT DT105 GT 260/70R20 14.9R28 Basic Basic Option Option 280/65R16 420/65R24 Option Option Option Option 280/70R18 380/70R28 Option Option 280/70R16 420/70R24 Option Option Option Option 260/70R18 16.9R24 Option Option Option Option 260/70R20 420/70R28 Option Option Option Option 280/70R16 14.9R24 Basic Basic 280/65R16 440/65R24 Option Option 7.50R18 13.6R28 Option
10 ) RADIATOR CORE SUPPORT
Fig. 13 Ballast support
DT60 F DT70 F DT75 F DT80 F DT85 F DT95 F DT105 F6.00R16 12.4R24 Basic 260/70R16 380/70R24 Option Optione Option Option Basic Basic Option 6.00R16 360/70R24 Option 7.50R18 13.6R28 Option Option 7.50R16 13.6R24 Option Basic Basic Basic Option 280/70R16 14.9R24 Option Option Option Option Option Basic 280/70R16 420/70R24 Option Option Option Option Option Option 280/70R16 360/70R28 Option Option Option Option Option 280/70R16 420/65R24 Option Option Option Option 280/70R18 360/70R28 Option Option Option Option 260/70R20 14.9R28 Option Option Option 280/65R16 440/65R24 Option Option
The ballast support is built into the radiator
core support ( Fig.13 ).
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