Husqvarna PT26D Workshop Manual page 67

17. Fill with coolant. See the mixing table in
the chapter "Specifications". Run the
engine and top up if necessary.
18. Check for leakage after running warm.
Pressure testing the radiator
The radiator must be disconnected from the
remainder of the cooling system when testing
at the pressure below.
The max. permitted pressure in the coolant
section or the hydraulic section is 10 bar
static or dynamic pressure.
Oil or air can be used as the pressure
medium.
Use a coolant system tester with an adapter
to pressure test the complete cooling system.
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English-
REPAIR INSTRUCTIONS