MacDon M155, Operator'S Manual

Page: 369 / 510

MAINTENANCE AND SERVICING
Engine Cooling System
The engine cooling system is designed to maintain the engine operating temperature within the speci fi ed
operating range.
NOTE:
Antifreeze is essential in any climate. It broadens the operating temperature range by lowering the coolant
freezing point,
AND
by raising its boiling point. Antifreeze also contains rust inhibitors and other additives to
prolong engine life.
IMPORTANT:
If antifreeze strength is not adequate, do
NOT
drain cooling system to protect against freezing. System may not
drain completely and damage from freezing could still result.
Refer to
8.2.3 Lubricants, Fluids, and System Capacities, page 466
for detailed information.
Inspecting Radiator Cap
The radiator cap must fi t tightly and the cap gasket must be in good condition to maintain the 14–18 psi
(97–124 kPa) pressure in the cooling system.
CAUTION
To avoid personal injury from hot coolant, do NOT turn radiator cap until engine cools.
1. Open the hood. Refer to
5.2.3 Opening Hood (Highest Position), page 307
.
2. Open the platform. Refer to
5.3.1 Opening Platforms (Standard Position), page 309
.
3. Turn the cap (A) counterclockwise to the fi rst notch to
relieve pressure before removing cap completely.
4. Turn the cap (A) again and remove.
5. Check the gasket for cracks or deterioration and
replace the cap if necessary.
6. Check that the spring in the cap moves freely.
7. Replace the cap if spring is stuck.
8. Close the platform. Refer to
5.3.2 Closing Platforms
(Standard Position), page 310
.
9. Close the hood. Refer to
5.2.4 Closing Hood (Highest
Position), page 308
.
Figure 5.87: Engine Cooling System
Checking Engine Coolant Strength
Check the anti-freeze in the radiator with a tester every year, preferably before off-season storage.
CAUTION
To avoid personal injury from hot coolant, do NOT turn radiator cap until engine cools.
1. Open the hood. Refer to
5.2.3 Opening Hood (Highest Position), page 307
.
2. Open the platform. Refer to
5.3.1 Opening Platforms (Standard Position), page 309
.
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