HATTAT A90 - Change Cab Air Filter (34); Tighten Frame Nuts and Bolts (35); Maintenance Every 2000 Hours or Every Other Year; Clean Cooler System (36)

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8.5.11. Change cab air filter (34)
Change lower filter
Lift up the filter housing cover (1) and replace the
filter (2) with a new one. Fit the cover correctly.
Change filter more often if necessary.
8.5.12. Tighten frame nuts and
bolts (35)
8.6. Maintenance every 2000 hours or every other year
8.6.1. Clean cooler system (36)
Periodically check and clean the outside of the
radiator by means of compressed air or by flushing
through with water. Also clean from the fan side of
the radiator.
The cooling system can be thoroughly cleaned if
problems occur in the function, in which case clean
as follows.
Clean the coolant system using a special cleaning
agent available from your dealer. Follow the
manufacturer’s instructions.
8.6.1.1. Draining
Always stop the engine before draining the coolant.
- ALWAYS open the cap (1) of the expansion tank
first carefully. At running temperature the expansion
tank has overpressure (1.0 bar).
- Loosen the lower water pipe (2) The best way to
drain the system is to loosen the upper end of the
pipe and then loosen the lower end, then the pipe
can be bent to the side and the fluid drained into a
container.
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