mecalac 14 MBX, Handbook Of Repair

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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.
14MBX 30750
4 M1