Operation; Before Operating The Unit - Zanotti DFZ Use And Maintenance Instructions

4. Operation

4.1 Before operating the unit

1. Check the belts. In fact, their tension must be perfect in order to prevent them
from slipping if they are too slack (as this would generate heat and would
therefore shorten the life of the belts) or the bearings from wearing out too fast
if the belts are too tight.
It is a very easy check: pressing slightly at the center of the longest side of the
belt, there should be a slack of 8 to 12 mm (5/16 in. to 15/32 in.)
Should such slack be higher or lower, loosen or tighten the belts as required.
2. Carefully check the electrolyte level inside the battery: if it is too low, top it up
using distilled water until you reach the right level. Thoroughly check all con-
nections and fasteners of maintenance-free batteries.
3. Apart from the above mentioned checks, it is advisable to overhaul both the
refrigeration unit and the isothermal cold room.
The unit must be completely freed from any objects (insects, pieces of paper,
etc.) which may have slipped into the condenser air intakes while the vehicle
was running.
A general check on bolts and electric wires and to locate possible leaks in the
system can prove very useful too. Concerning the cold room, check doors,
vents, seals, coatings and whatever else may jeopardize the unit's capability
of keeping the desired temperature.
4. The last check to carry out is the engine oil level. In fact, you should wait until
all the oil has drained from the engine into the sump. After that, check the oil
level just as you would in a car.
Remove the oil dipper rod, wipe it with a cloth, reinsert it into the sump, with-
draw it again. Oil level should be between the maximum and minimum level
marks. Top up, if needed.
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