PRONAR T900, Operator'S Manual, Page: 118 / 153

Pronar T900 SECTION 5
5.22
•
Tighten the nut until resistance is felt,
•
Repeat the above steps for the other actuator.
FIGURE 5.9 Emergency release of diaphragm actuator
(1) diaphragm-spring actuator, (2) tensioning bolt, (3) nut, (4) washer, (5) tensioning bolt
holder
In order to return to actuator normal operation mode, undo nut (3) and take tensioning bolt (2)
out of the actuator. After completion of the activities, place the bolt together with other
elements in the actuator holder (5) and protect the rear opening with a plastic stopper.
DANGER
Exercise caution while working. During putting the actuator spring under tension, the
trailer is not immobilised with parking brake. That is why chocks must be placed under
the trailer wheels in order to secure the trailer against rolling.
The actuator may be repaired only in an authorised service centre.
Do NOT travel with unreliable brake system.
5.5 HYDRAULIC SYSTEM MAINTENANCE
5.5.1 PRELIMINARY INFORMATION
Work connected with the repair, change or regeneration of hydraulic system components
(hydraulic cylinders, valves etc.) should be entrusted to specialist establishments, having the
appropriate technology and qualifications for this type of work.
The duties of the operator connected with the hydraulic system maintenance include: