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6 - Maintenance
Boom hydraulic damper
The hydraulic damper is a device that has two functions. It allows the boom to be locked (blocking function), and it also
cushions from shocks while maintaining the boom parallel to the ground, compensating for any uneven terrain.
The boom suspension will normally suit most conditions and does not require any adjustment. However, you can check the
boom movements and change the damper settings if necessary.
Damper performance adjustment
• Place the blocking switch in the unlocked position.
• Hold down the end of the boom to tilt it and then release it.
• Ensure that the boom returns to its initial position in one oscillation. Otherwise the damper performance should be
adjusted.
• Loosen the counter-nut fig.1.
• Turn the pressure limiter screw fig.2 clockwise to increase the
damper performance, which will lead to a reduction in the number
of oscillations. Conversely, if the screw is turned anticlockwise, the
damper performance decreases, which will lead to increased
oscillation of the boom.
÷
NOTE! The basic setting is obtained by completely tightening the pressure limiter screw fig.1, then loosening it by 3
to 4 turns depending on the boom model.
Damper maintenance
The damper may lose effectiveness if the rod has a short run. Beyond 5 mm, oil should be added.
• Completely dismantle the damper.
• Loosen the pressure adjustment screw fig.2 to cancel the damper function
• Press the manual control fig.3 and push back the damper rod completely.
• Remove the filler screw fig.4.
• Pour in the oil and replace the filler screw.
• While holding down the manual control, move the rod in and out several times.
• Repeat the previous operations until the damper is completely filled.
• Adjust the damper performance (see above).
Compressed air pressure adjustment
ALPHA evo self-propelled vehicles are fitted as standard with a
mechanically controlled air compressor, which is used to operate the
pneumatic nozzles.
Air pressure adjustment
• Turn the screw fig.1 clockwise to increase the pressure.
Activation pressure = 6.0 bar
Maximum admissible pressure = 6.0 bar
Some ALPHA evo self-propelled vehicles may be fitted with an electrical air compressor at the rear of the machine.
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