PERIODIC MAINTENANCE
27
OPERATING INSTRUCTIONS - BelMix T659 FEED TRAILER
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Parking brake: hand mechanical control via a crank lever mechanism
and a screw gear, located on the right side of the machine and
operating the axle wheels.
Fig. 12 Single line pneumatic system diagram
1 - pneumatic connector plug for coupling with the tractor; 2 - air filter; 3 - control valve;
4 - air tank; 5 - water drain valve; 6 – manual braking force control; 7 - check connector; 8 -
pneumatic membrane actuator.
6.5.1. SERVICING THE BRAKE PNEUMATIC SYSTEM
When servicing the feeder wagon, check the tightness and the condition
of parts and connections of the braking system, and periodically drain
the water condensate from the air tank. Check the leak tightness of
the system at the rated pressure of approx. 600 kPa for the single-
line system. Leaks are detected by a distinct hiss or air bubbles (after
coating with soapy water) at the points of air escape from the system.
If the leaks are caused by damaged seals, lines or other parts (valves,
actuators, etc.), replace them with new parts. Drain the water from
the air tank by tilting the drain valve stem to the side when the tank is
pressurised; the drain valve must also be unscrewed from the tank
and cleaned of accumulated dirt once a year, before the winter season.
6.5.2. ADJUSTMENT OF THE BRAKING SYSTEM
COMPONENTS
When servicing the feeder wagon, check the condition of parts and
connections of the braking system, and periodically inspect the
lubrication of control elements.
Adjust the brakes when the following occurs:
•
there is excessive clearance between the shoes and the drum
from the brake shoe pad wear, resulting in decreased braking
performance;
•
the wheel brakes work unevenly and out of sync.
With the properly adjusted brakes, the braking force (i.e. the total of
braking forces at the circumference of the wheels) shall be at least 30%
of the permissible total weight of the feeder wagon when decelerating
with the service brake; the braking force (i.e. the total of braking forces
at the circumference of the wheels) when actuating the parking brake
shall be at least 16% of the permissible total weight of the trailer. Both
wheels of the same axle should be braked evenly; the brake force
differential between the left and right side of the feeder trailer side
shall not exceed 30%, with 100% being the higher force.
Adjust the brakes by changing the expander lever position against the
expander shaft. To do this, jack up the wheel and while turning the
wheel, realign the expander lever against the shaft (on the comb) to
feel that the brake shoes slightly rub against the drum. After a correct
adjustment of friction components, the wheel should rotate smoothly,
without cogging or evident resistance (not caused by rubbing of the
brake shoes against the drum). Slight rub of the shoes against the drum,
especially on a brand new feeder trailer or following replacement of
the shoes is normal.
After completing the adjustment, check and adjust the parking brake.
The parking brake is adjusted by setting the cable length that couples
the expander shaft lever with the engaging mechanism. The required