188 SE RVICING A ND INSPEC TION
10.7.5
Servicing the cooling system
The radiator is installed behind the diesel engine (Fig. 92).
One part cools the hydraulic fluid, while the other part cools the engine.
WARNING
Crushing/shearing hazard.
Moving engine parts can crush and cut.
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Do not open the engine enclosure unless the engine is stopped to avoid hazards from moving objects (cooling fan and drive belts for the fan and alternator).
Burn hazard.
Engine components can get very hot during operation.
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Do not touch the engine mass, exhaust system, or cooling system immediately after stopping the engine.
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Wait until the stopped engine has cooled to the point that the exhaust system, engine mass and cooling system are comfortable to touch.
Service the cooling system according to the inspection intervals specified in this Operator’s Manual.
Stop the engine immediately if the temperature
indicator in the instrument panel Item 6 (Fig. 13, page 50) is illuminated.
If the temperature indicator is illuminated, either the engine or the hydraulic oil or both have become too hot.
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The temperature indicator light Item 6 (Fig. 13, page 50)
is connected to two temperature sensors. One is located on
the engine (Fig. 90), the other on the hydraulic oil reservoir
(Fig. 91). To ascertain whether the engine or hydraulic oil
(or both) have become too hot, disconnect the cable on one of the two temperature sensors.
In the event of cooling system overheating, check the following:
•
Is there enough coolant in the radiator and is it the correct coolant mix?
•
Is the fan‘s V-belt taut and in good condition?
• Is the radiator air flow restricted?
SE RVICING A ND INSPEC TION 189
Fig. 90
Engine temperature sensor
Fig. 91
Hydraulic oil temperature sensor
190 SE RVICING A ND INSPEC TION
Checking the coolant level / refilling the coolant
WARNING
Burn hazard.
Hot fluid (exceeding 93°C (200°F)) will spray under pressure. Contact with skin will cause severe burns.
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Do not remove the radiator cap if the engine is at operating temperature.
Poison hazard.
Coolant can be harmful or fatal if swallowed.
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If hot coolant makes contact with the skin or eyes, rinse immediately with clear water and seek immediate medical attention.
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If coolant is swallowed, seek immediate medical attention.
ENVIRONMENTAL NOTE
Avoid environmental damage.
Do not allow antifreeze and coolant to be released uncontrollably into the environment.
Collect antifreeze and coolant and dispose of it in an ecologically sound manner.
The coolant must consist of equal parts of water and antifreeze. This mix guarantees an optimal ratio of cooling performance and corrosion protection.
Do not pour in the coolant too quickly if the full amount is to be poured in, e.g. when changing the coolant.
Do not exceed a refill rate of 5 l/min (1.3 gpm) to reduce the potential for air entrapment during filling.
Use the capacity guide on page 169. Fill until the
coolant is below the neck of the radiator cap spout.
Replace the cap and run the engine briefly.
Stop the engine and check the level. Add coolant if the level has dropped.
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Checking the antifreeze mix
Check the coolant level at regular intervals. If you look into
the radiator opening (Fig. 92) from above, the radiator fins
should be covered with coolant.
Make sure that enough antifreeze is always present in the coolant, even in summer, as antifreeze also prevents internal corrosion of the radiator and the engine.
Antifreeze prevents the coolant from freezing at temperatures below zero and protects the engine block and the radiator from internal corrosion. Under normal conditions, the antifreeze concentration is sufficient for protection down to between –20°C (–4°F) and –30°C (–22°F). You can determine the antifreeze concentration by using a conventional
antifreeze tester (Fig. 93).
Fig. 92
Radiator opening
Fig. 93
Checking the antifreeze mix
192 SE RVICING A ND INSPEC TION
Changing the coolant
NOTICE
Replace the coolant after two years of use.
The coolant must consist of equal parts of water and antifreeze. This mix guarantees an optimal ratio of cooling performance and corrosion protection.
Do not exceed a refill rate of 5 l/min (1.3 gpm) to reduce the potential for air entrapment during filling.
Use the capacity guide on page 169. Fill until the
coolant is below the neck of the radiator cap spout.
Replace the cap and run the engine briefly.
Stop the engine and check the level. Add coolant if the level has dropped.
1. Stop the loader on a horizontal surface and set the parking brake.
2. Lower the loader lift arms and attachment to the ground or the work surface..
3. Stop the engine.
4. Refer to Section 10.6, page 169 for the volume of cool-
ant and select a drain container of sufficient capacity to avoid spillage.
5. Remove the radiator cap.
6. Remove the lower radiator hose (remove the hose clamp and remove the hose).
After the coolant has drained completely, flush the system with clear water and making certain to capture the drained liquid in a container.
1. Correctly reattach the lower radiator hose.
2. Mix new coolant using equal parts of clean tap water and new antifreeze.
3. Pour the new coolant into the radiator opening until the radiator fins are covered with coolant. Do not add the new coolant at a rate faster than 5 l/min (1.3 gpm) to reduce the risk of air pockets in the cooling system.
4. Install the radiator cap.
5. Check the coolant level once again after half an hour of operation.
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SE RVICING A ND INSPEC TION 193
Cleaning the cooling system
The greater the amount of dust in the air, the more frequently the radiator has to be checked and cleaned.
Always cover up the suction connection of the air filter before cleaning the radiator.
Do not damage the radiator fins when cleaning the radiator. Straighten any twisted radiator fins carefully.
Clean the dirty radiator with compressed air (Fig. 94). You
can also clean heavily contaminated radiators with water under high pressure.
Clean
• the engine‘s radiator
• the hydraulic fluid cooler
• the alternator (with compressed air only!)
ENVIRONMENTAL NOTE
Avoid environmental damage
Clean the loader only in a suitable place where the waste water can be collected in an ecologically sound manner.
Collect contaminated waste water and dispose of it in an ecologically sound manner.
Fig. 94
Cleaning the cooling system
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Cleaning the cooling system if the loader is equipped with air conditioning
Avoid technical damage by overheating of the engine
If the loader is equipped with air conditioning, the condenser must be removed before the radiator and air conditioning condenser can be cleaned.
Avoid technical damage.
The blades of the condenser are very fragile and can be easily damaged.
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Handle the condenser with care.
Removing and fitting the condenser of the air conditioning system
1. Loosen the 2 M8 screws item 2 (Fig. 95).
2. Carefully lift the condenser out of its mounting (Fig. 95).
Do not disconnect the hose connections from the condenser! You may need to remove the cable ties of the
hose connections item S (Fig. 95).
3. Carefully place the condenser to one side.
Preparations
You can now clean the radiator and the condenser. To install the condenser, follow the above steps in the reverse order
1. Stop the loader on a horizontal surface and set the parking brake.
2. Lower the loader lift arms and attachment to the ground or work surface.
3. Stop the engine.
4. Wait one minute.
5. Open the engine enclosure (Ref. Section 10.7.1, pages
170-171).
