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BM_2#0703
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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 ).
