mecalac 14 MBX User manual

HANDBOOK OF REPAIR
MANUFACTURER : “MECALAC SAS”

30750 14MBX
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Contents
1. Safety precautions ..................................................................................................................................3
2. Description of the machine ....................................................................................................................4
2.1 Central joint .....................................................................................................................................4
2.2 Stabilizers ........................................................................................................................................4
2.3 Rear chassis ....................................................................................................................................4
2.4 Transmission ...................................................................................................................................4
2.5 Turntable .........................................................................................................................................4
2.6 Cab ..................................................................................................................................................4
2.7 Controls ...........................................................................................................................................4
2.8 Seat .................................................................................................................................................4
2.9 Equipment .......................................................................................................................................4
2.10 Tool-holder .......................................................................................................................................5
3. Technical characteristics ........................................................................................................................7
3.1 Turbocharged engine ......................................................................................................................7
3.2 Axles ................................................................................................................................................7
3.3 Capacities ........................................................................................................................................7
3.4 Electrical system .............................................................................................................................7
3.5 Hydraulic system .............................................................................................................................8
4. Equipment’s travel curves ....................................................................................................................10
4.1 In back - hoe bucket position .........................................................................................................10
4.2 In loading bucket position ...............................................................................................................11
5. Table of stability loads in kg .................................................................................................................12
5.1 Lifting and handling in the longitudinal position with standard or telescopic stabilizers. ..............12
5.2 Lifting and handling in the longitudinal position without stabilizers ...............................................13
5.3 Lifting and handling in the transverse position with standard stabilizers ......................................14
5.4 Lifting and handling in the transverse position without stabilizers ................................................15
5.5 Lifting and handling in the transverse position with telescopic stabilizers ....................................16
6. Towing......................................................................................................................................................17
6.1 Disconnection of the hydrostatic travel .........................................................................................17
6.2 If the turntable is badly oriented ....................................................................................................18
7. Transporting the machine......................................................................................................................19
7.1 Loading on a trailer .......................................................................................................................19
7.2 Slinging for lifting ...........................................................................................................................20
8. Location of the hydraulic components ................................................................................................21
9. Hydraulic diagrams ...............................................................................................................................25
9.1 Travel circuit ...................................................................................................................................25
9.2 Accelerator, main and parking brake circuits .................................................................................26
9.3 Steering and slewing circuits..........................................................................................................27
9.4 Turntable supply and return circuit .................................................................................................28
9.5 Equipment pump, standard stabilizers and steering lock circuits ..................................................29
9.6 Boom, intermediate boom, dipper, offset and additional functions circuits ....................................30
9.7 Bucket circuit ..................................................................................................................................31
9.8 5-spool valve ..................................................................................................................................32
9.9 Additional hydraulic equipment for fitting of the hammer return on the equipment (option) ..........33
9.10 Tool-holder circuit (option) ..............................................................................................................34
9.11 Air conditioning circuit (option) .......................................................................................................35
9.12 Equipment pump, telescopic stabilizers and steering lock circuits (option) ...................................36
9.13 Fitting of 3 safety valves on the equipment (option) ......................................................................37
9.14 Fitting of 4 safety valves on the equipment (option) ......................................................................38
9.15 VOLVO tool-holder (option) ............................................................................................................39
10. Parts list of the hydraulic diagram .......................................................................................................41
11. Installation of the electric bundles ......................................................................................................43

12. Location of the electric components ...................................................................................................45
12.1 Solenoid-operated valves...............................................................................................................45
12.2 Relay / fuse box (under the cab seat) ...........................................................................................49
12.3 Electrical box (in the rear chassis section) ....................................................................................50
12.4 Air conditioning relays box (option) (under the cab floor) .............................................................50
13. Parts list of the electric diagram...........................................................................................................51
14. Adjustment procedure ...........................................................................................................................53
14.1 Adjustment Procedure for the Heat Engine ..................................................................................53
14.2 Hydraulic adjustment procedure for the gears ..............................................................................55
14.3 Direction adjustment procedure ....................................................................................................62
14.4 Hydraulic adjustment of the equipment .........................................................................................64
15. Control Sheet .........................................................................................................................................73
16. Tools ........................................................................................................................................................75
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1. Safety precautions
Throughout this book the symbol is used to draw your
attention to areas where special care is required, to prevent
accidents and injury.
•Construction sites are busy places, often with wet, muddy
ground, conditions which impede other workers ability to
avoid carelessly driven machinery. Skid-steers are designed
to be highly manoeuvrable and compact in operation. They
are rugged and can be operated under a variety of
conditions, and the operator may be presented with hazards
associated with operating this machine.
•Be vigilant and “think safety”.
•DO NOT operate this machine unless you have been
properly instructed on its control and safe operation.
•These operating instructions are designed to familiarise the
user with the machine and its designated use. The instruction
manual contains important information on how to operate the
machine safely, properly and most efficiently. Observing
these instructions help to avoid danger, to reduce repair
costs and down-time and to increase the reliability and life of
the machine.
•The operating instructions must always be available
wherever the machine is in use. These operating instructions
must be read and applied by any person in charge of carrying
out work with and on the machine, such as:
–care and disposal of fuels and consumables.
–maintenance (servicing, inspection, repair) and/or
transport.
•In addition to the operating instructions and to the mandatory
rules and regulations for accident prevention and
environmental protection in the country and place of use of
the machine, the general recognised technical rules for safe
and proper working must also be observed.

2. Description of the machine
The excavator is made up of a front chassis section, a rear chassis section, a turntable, a cab and equipment
consisting of four elements.
2.1 Central joint
The ground contact of the four wheels is provided by the oscillation of the rear axle. The ground contact
of the four wheels is provided by the oscillation of the rear axle.
2.2 Stabilizers
Two standard or telescopic stabilizers (option) with independent control, combined with the oscillation lock
stabilize the machine during operation.
2.3 Rear chassis
The rear chassis section is equipped with a water-cooled 4 in-line-cylinder engine.
-The engine drives two variable displacement pumps which perform the following functions:
•Transfer movement pump: coupled in a closed circuit with a variable displacement motor, the
assembly forming a hydrostatic transmission.
•Equipment pump: movements of the rams, power-assistance of the controls and associated
functions.
-The engine also drives a fixed displacement pump which performs the machine’s steering and slewing
movements.
2.4 Transmission
The transmission is of the permanent 4x4 type, with a limited-slip differential on both axles.
2.5 Turntable
The turntable is connected to the front chassis section by a slewing crown wheel. The turntable supports
the operator’s cab, the excavator’s equipment and the counterweight.
The slewing internal crown wheel is driven by a hydraulic motor equipped with a negative brake in the
event of a power-assistance pressure fault.
2.6 Cab
The monocoque cab is closed and heated. It is “FOPS” and “ROPS” approved (falling objects and roll-over
protective structure).
An electronic control panel groups together the machine’s operating and safety information.
2.7 Controls
The controls are grouped together on the instrument panel and integrated in consoles situated on either
side of the seat.
2.8 Seat
The seat is sprung, dampened, height-adjustable and adjustable lengthwise.
2.9 Equipment
The equipment is controlled by manipulators enabling the movements to be combined flexibly and
efficiently. It is in the centre of the machine and made up of four elements: the boom, the intermediate
boom, the jib and the dipper.
The boom is controlled by the parallelogram formed by the boom ram, the braces and the boom
connecting rods. This gives it the advantage of a 142° travel.
The offset jib permits, by the action of a hydraulic ram, the symmetrical offset of the dipper and the tool in
order to dig outside the machine’s boundaries.
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2.10 Tool-holder
At the end of the dipper is the tool-holder permitting the instant changing of the bucket or tool from the cab
without manual intervention. The bucket or tool has mechanical and automatic locking, only their unlocking
is hydraulically controlled.
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3. Technical characteristics
3.1 Turbocharged engine
-Type: ..............................................................................................................CUMMINS 4BTA3.9 ELITE
-Diesel: ......................................................................................................................... 4 in-line cylinders
-Net horsepower at flywheel (DIN 70020 / ECE-R2403): ........................................ 82 kW at 2,200 rpm
-Max. net torque at flywheel (DIN 70020 / ECE-R2403): ...................................... 460 Nm at 1,400 rpm
-Cubic capacity: ........................................................................................................................ 3922 cm3
-Bore x stroke: ........................................................................................................... 102 mm x 120 mm
-Cooling by: ................................................................................................................................... coolant
-Air filter: ......................................................................................................... with dry cyclonic cartridge
3.2 Axles
-Rigid axle on the front chassis section: .................................................................. DANA 112 / 121
Gear ratios:
•Bevel gear: ............................................................................................................................... 12/35
•Epicyclic wheel reducer, 4 planet wheels: .................................................................................... 1/6
-Oscillating axle on the rear chassis section: ................................................. DANA 357 / 112 / 158
With gearbox:......................................................................................................................... DANA 357
Gear ratios:
•Gearbox integrated in the rear axle:
-1st gear: RANGE 1...............................................................................................................1/4.06
-2nd gear: RANG 2................................................................................................................1/1.62
•Bevel gear: ............................................................................................................................... 12/35
•Epicyclic wheel reducer, 4 planet wheels: .................................................................................... 1/6
-Self-blocking differential: ........................................................................................... limited slip 45%
-Integrated oil-bath hydraulic disc brakes: ...................................................... 8 discs at the front
:...................................................... 8 discs at the rear
3.3 Capacities
-Hydraulic oil tank:............................................................................................................................. 110 l
-Total capacity of the hydraulic circuit: ............................................................................................. 220 l
-Front axle housing: .......................................................................................................................... 7,1 l
-Rear axle housing: ........................................................................................................................... 7,4 l
-Transfer box coupled on the rear axle / gearbox: ........................................................................... 1,6 l
-Wheel reducer: .............................................................................................................................. 1,25 l
-Diesel engine + filter (sump: 13 l) ................................................................. mini.: 11,5 l - maxi.: 14,5 l
-Diesel fuel tank: .............................................................................................................................. 190 l
-Cooling system: ................................................................................................................................ 20 l
3.4 Electrical system
-Batteries: .......................................................................................................... 24 V (2 x 100 Ah-500 A)
-Starter: ............................................................................................................................. 24 V - 2,8 KW
-Alternator: ........................................................................................................................... 24 V - 40 Ah
-Battery cut-out.
-28-track rotating commutator, all of whose wires (white) are marked with a number.
-Engine shut-off device which works by cutting off the diesel fuel supply.
-Lighting and signalling complying with the highway code.
-Relay/fuse box (under the cab seat).
-Wiring harnesses with waterproof connectors.
-Negative pole to the chassis.

3.5 Hydraulic system
Three completely independent circuits: hydrostatic transmission, equipment circuit, and steering and
slewing circuit.
3.5.1 Hydrostatic transmission
Reversible closed circuit, with declutching bypass valves in case towing is necessary.
-Transfer movement pump: ............................................................................................. 71 cm3
-Transfer movement engine:........................................................................................... 107 cm3
-Axial piston engine and pump:
Variable displacement and axial piston motor and pump permitting the continuous variation of the
transmission ratio over the machine’s entire speed range. Automatic adjustment of the optimum
transmission ratio to suit the motion resistance and accelerator setpoint of the diesel engine: it
is automobile control.
-Selection of direction of travel:
(F) “forward” or (R) “reverse” by electric control on the steering ”Commodo”, without being
obliged to stop.
-Two manual speed ranges operated by the selector:
This change of speed must be done when stationary, with the ‘Commodo’ in neutral (N) and the
brake pedal fully depressed.
•Selector OFF = Range 1, “Site” speed,
•Selector ON = Range 2, “Road” speed.
For each of these 2 speed ranges, it is possible to operate 2 speeds for both directions of travel
selected by the ‘Commodo’ electric control, i. e. in all 4 speeds:
•RANGE 1:(L) speed from 0 to 4 kph,
(H) speed from 0 to 12 kph.
•RANGE 2:(L) speed from 0 to 10 kph,
(H) speed from 0 to 30 kph.
Note: For Germany, between 0 and 20 kph.
Possibility of control in “loader mode” (L) or (H) and (F) or (R) using the right manipulator.
-Inching” slow approach control:
Allows reducing the displacement speed at a constant engine regime and therefore applying a
constant power to the wheels in both front/reverse directions.
-Handbrake (parking and emergency):
It works by lack of pressure on the integrated discs on the front axle.
-Hydrostatic foot brake:
Foot-operated control with inching device, main brake function and working brake function.
-Main brake:
In the initial part of its travel, it reduces the machine’s travel speed by means of the valve (inching
function), then if the braking pressure exceeds 13 bars it acts simultaneously on the integrated
discs on the front and rear axles (main brake function). This system increases the service life of
the brake discs.
-Working brake:
Aswitch locks the foot-operated control in the braked position and makes it possible to work by
releasing the brake pedal while at the same time having the brakes locked.
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