LM 287 User Manual – 30.10.2023
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3 MACHINE STRUCTURE
It is vital to know the machine's structure in order to ensure safe and efficient operation and maintenance. This section
covers the machine's structure, i.e. locations and names of the main components.
Detailed instructions for operation and maintenance are provided in sections “4 CABIN AND CONTROLS”, “5 DRIVING
AND USE” and “6 MAINTENANCE”.
Effective use of the machine requires that you carefully familiarize yourself with the machine’s operating principles. Work
must be performed by using the many special features of the machine. This will ensure great work performance, both
quantitatively and qualitatively.
LM Trac 287 has a component structure so maintenance and repairs are quick and easy to perform.
The power source, Perkins 403J-E17T diesel engine, and the connected drive and working hydraulic pumps form a
single package. This package is mounted on the body with rubber pads, so that engine vibration is not transmitted to the
body where they might create undesired noise and vibration. The safety cabin is also mounted on the body with rubber
pads to minimize undesired noise.
Tools are mounted on the tool mounting at the front of the machine, e.g. the A frame. The fuel and hydraulic oil tanks and
the battery are located low on the sides of the body to achieve a low center of gravity. The machine is equipped with
rear-wheel steering.
Efficient use of the LM Trac 287 machine requires that the driver understands the principle of the machine's driving
automation.
The drive power train is fully hydraulic, which enables highly flexible driving forwards/backwards.
The double action drive pedal is used for the operations that are in a traditional mechanical power train performed by
clutch/brake pedal and for changes of direction.
When the drive pedal is pressed with the ball of the foot the machine moves FORWARDS and with the heel
BACKWARDS.
The position of the drive pedal affects driving speed and direction through the amount of oil provided for the hub motors.
The rotation speed of the engine is regulated by a separate hand throttle. In practice, the hand throttle is used to set a
suitable engine rotation speed, and the drive pedal is used to select the driving direction and speed. When pressure on
the drive pedal is released, an automatic braking action resulting from the hydrostatic power train takes place. This
automatic braking works regardless of driving direction.
The machine is also equipped with a separate brake pedal that is usually only necessary for keeping the machine in
place on a sloping surface.
LM Trac 287 machine's speed ranges:
2WD: 4WD:
Fast 0–20 km/h Fast 0–20 km/h
Slow 0–10 km/h Slow 0–10 km/h
The diesel engine rotates a variable displacement axial piston pump that supplies oil to the two‐speed hub motors
located in the front wheel hubs. Driving speed can be adjusted steplessly throughout the speed range.
The function corresponding to the traditional differential lock is created by means of electro‐hydraulic valves that can be
used to equalize oil flow to the hub motors. This generates an equal tractive capacity to all drive wheels. The efficient use
of the machine requires that the driver understand the principle of the machine's driving automation.
The implementation of the work hydraulics also differs from the traditional mechanical use. The LM Trac 287 main
machine supplies all actuators hydraulically. The power source is a fixed‐displacement gear pump.
The steering mechanism of the machine is hydrostatically boosted rear wheel steering. Steering functions also when the
machine is turned off, but it is quite stiff. The system comprises a separate steering hydraulics pump, steering gear
(orbitrol) and steering cylinder.
The machine is equipped in connection with hub motors with plate compressor brakes submerged in oil that serve as
both driving and parking brakes. The second braking system is an automatic braking function that results from the fully
hydraulic drive power train that in practice also serves as a service brake.
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