POWER TRAIN 16000 SERVICE/MAINTENANCE MANUAL
7-10
Published 05-03-17, Control # 228-03
COOLING SYSTEM
The cooling system consists of a horizontal radiator mounted
above the engine and a variable-speed, hydraulically-driven
blower-type fan.
The cooling system flow is illustrated in Figure 7-9
.
The deaeration cooling system continually removes air from
the system:
1. A small percentage of total coolant flow is circulated
through a vent line to the radiator.
2. Air separates from the coolant.
3. Air collects at the top of the radiator. When pressure
rises to 1 bar (14.5 psi), a relief in the pressure cap
opens to exhaust air through the overflow line.
4. Deaerated coolant returns to the system through a
make-up line.
Maintenance
At the start of each shift, check the coolant level when the
coolant is cold:
1. Make sure that the coolant level is at the upper sight
glass (Figure 7-7
) on the deaeration tank.
2. If the coolant level is low, fill the system with coolant.
See the engine manufacturer’s manual for antifreeze
and coolant additive recommendations.
3. Look for coolant leaks while the engine is running. Fix
any leaks.
Semiannual Checks
Perform the following checks every six months:
1. Inspect the pressure cap and thermostat for proper
operation and replace worn parts:
• The Pressure cap relieves at 1 bar (14.5 psi).
• The Thermostat begins to open at 82°C (180°F) and
opens fully at 93°C (200°F).
2. Inspect engine belts for wear and proper adjustment
(see the engine manufacturer’s manual).
3. Inspect cooling system hoses for deterioration and other
defects. Replace hoses as necessary.
4. Tighten hose clamps.
5. Clean all dirt and other debris from the outside of the
radiator.
6. Make sure the overflow line on the tank is open.
Draining Cooling System
See Figure 7-8 for the following procedure.
To drain the cooling system, use the following:
1. Stop the engine.
2. Open the seven bleed valves:
• One on top of the coolant tube
• Four on the radiator
• Two on the DEF coolant manifold block (see
Figure 7-12
)
3. Place a suitable container under the drain valve. System
capacity is approximately 95 L (25 gal).
4. Remove the pressure cap.
5. Open the drain valve.
6. When the system is drained, close the drain valve.
7. Recycle used coolant at a facility that accepts coolant.
WARNING
Burn Hazard!
Avoid personal injury from heated coolant spray or steam.
Do not remove the radiator pressure cap when the engine
is hot. Stop the engine and wait until the coolant
temperature is below 50°C (122°F). To remove the
pressure cap, use the following procedure:
• Place a protective covering over the pressure cap.
• Slowly turn the pressure cap counterclockwise until it
stops at the safety detent.
• Wait until the pressure (indicated by a hissing sound)
is completely relieved.
• Depress the pressure cap and turn it
counterclockwise to remove it.
CAUTION
Overheating Hazard!
Do not allow the coolant level drop below the level of the
upper sight glass located on the deaeration tank.
FIGURE 7-7
Deaeration
Tank
Coolant Level Full
(Cold) Sight Glass
Coolant Level Low
(Cold) Sight Glass
IMG7667
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