Airo A16 J Series, User Manual

Page: 74 / 128

User’s Manual – A16 J A18 J Series Page 74
7.2.10. Checking the efficiency and calibration of the brake valves.
These valves check the minimum operating pressure
during drive (in both running directions) and affect the
dynamic braking and the drive speed. Normally, this valve
does not require any adjustment, since it is calibrated at
the factory before the machine is delivered.
The braking systems stop the machine when the drive
controls are released. Once the machine has stopped, the
parking brakes are automatically engaged to keep the
machine in position.
Perform a functional control at least once a year.
To check the operation of the braking system:
 With platform completely lowered place the
machine on a flat ground, free of obstacles,
operate the drive control and when the max.
speed is reached, release the control
immediately.

The correct operation of the braking system
allows the machine to stop in a space lower than
70 cm;
Fig.28
 However, the braking system can stop and hold the machine on the slopes indicated in chapter “ Technical
Features ” (the braking space on descents is obviously longer; descend at minimum drive speed).
The calibration of both braking valves is required:

If the hydraulic unit A is replaced;

If one or both braking valves (in some cases only one valve is needed) are replaced.
To adjust the brake valve:

Locate the hydraulic unit(s) A called "drive plate".

Locate the braking valves B (one for each running direction).

Introduce a pressure gauge with full scale of at least 250 bar in the special quick coupling (1/4” BSP)

Select the minimum drive speed from the control box on the platform;
 Unscrew the lock-nuts C of the adjusting dowels.
 Using the control panel on the basket, let the machine travel (in the direction controlled by the valve) on a flat
ground down a straight path. Perform the calibration of the braking valve (for the actual travel direction) using
the adjustment screw and until the pressure value sets at the required position (call the nearest Customer
Service to request this information)
 When the required pressure value has been obtained make sure that the calibration of the valve controlling
braking in the opposite direction (if any - in some cases only one valve may be required) has remained
unaltered;

After completing all calibration works (the pressure values in the two directions should not vary from each other
by ±5 bar), lock the adjusting dowel by means of the lock nut.
ATTENTION!
THIS OPERATION IS A CRUCIAL MAINTENANCE TASK AND SHOULD BE STRICTLY CARRIED
OUT BY SPECIALIZED TECHNICIANS.