MacDon M155 2022 - Engine Cooling System; Inspecting Radiator Cap

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5.9.6 Engine Cooling System
The engine cooling system is designed to maintain the engine operating temperature within the recommended
operating range.
NOTE:
Using coolant with antifreeze is essential in any climate. Antifreeze allows the windrower to be operated in a broader range
of ambient temperatures by lowering the coolant’s freezing point and by raising its boiling point. Antifreeze also contains
rust inhibitors and other additives which extend the service life of the windrower.
IMPORTANT:
If the strength of the antifreeze in the coolant currently in the windrower’s cooling system is insufficient, do NOT drain the
cooling system. The cooling system may not drain completely, and damage from freezing may still result.
Refer to 8.2 Recommended Fuel, Fluids, and Lubricants, page 476 for information on the recommended coolant for the
windrower.
Inspecting Radiator Cap
The radiator cap must fit tightly and the cap gasket must be in good condition in order to maintain the cooling system’s
pressure level, which should be 97–124 kPa (14–18 psi). Inspect the cap whenever you measure the engine coolant’s
antifreeze strength.
DANGER
To prevent bodily injury or death from the unexpected startup of the machine, always stop the engine and remove the
key from the ignition before leaving the operator’s seat for any reason.
CAUTION
To avoid personal injury from hot coolant, do NOT attempt to open the radiator cap until the engine cools.
1. Shut down the engine, and remove the key from the ignition.
2. Open the hood to the highest position. For instructions, refer to 5.3.3 Opening Hood – Highest Position, page 317.
3. Move the platform on the left cab-forward side of the machine to the open position. For instructions, refer to 5.4.1
Opening Platforms – Standard Position, page 319.
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Figure 5.88: Engine Cooling System
4. Turn cap (A) counterclockwise to the first notch to relieve
the pressure in the cooling system before removing the cap
completely.
5. Turn cap (A) again and remove it.
6. Check the gasket for cracks or deterioration. Replace the
cap if it appears worn.
7. Check that the spring in the cap moves freely.
8. Replace the cap if the spring is stuck.
9. Close the platform. For instructions, refer to 5.4.2 Closing
Platforms – Standard Position, page 320.
10. Close the hood. For instructions, refer to 5.3.4 Closing Hood
– Highest Position, page 318.
MAINTENANCE AND SERVICING