CG958G Wheel Loader. Manual - part 29

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explanation of “Starting of Engine” in the chapter of “Operation”. 

 The machine has one 24kv starting system. Starting the engine with the external 

power source only can use the voltage of 24kv. High-pressure voltage will damage 

the electrical system. 

 Examine the dust and foreign substances on the coarse filtering net. If necessary, 

the dust and foreign substances shall be eliminated. Prior to discarding the coarse 

filtering net, clean it for six times. In cleaning the filter element, examine 

completely whether the filtered material has any crack. The filter shall be replaced 

once per year, even if the time of cleaning does not reach 6 times. As the coarse 

filter is repaired for three times, the thin filter shall be replaced. 

After installing a cleanly coarse filter, if the engine discharges black smoke, new 

fine filter shall be installed. 

Caution 

Do not try to repeatedly use the fine filtering element by means of cleaning. 

New one shall be used every time, or not the engine will be damaged possibly. 

Maintenance of Engine

 

In case the clauses relating to the maintenance of engine are not in conformity 

with the Engine Maintenance Manual, the Engine Maintenance Manual prevails.

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IV    Maintenance of Engine’s Cooling System

 

4.1 Coolant 

Keeping normal working temperature of diesel engine will improve the 

efficiency of the engine. Therefore it is necessary to maintain the cooling system 

properly. Overheat, overcooling, pitting corrosion, gaseous cavitation, crack of 

cylinder end, piston sticking and blockage of radiator are common failures of the 

cooling system. 

 It is suggested to add 30% anti-icing fluid into the cooling mixture. Under the 

working temperature of the engine, all kinds of water have causticity, regardless of 

the high concentration of the anti-icing fluid. 3%~ 6% coolant additives shall be 

added to protect the cooling system. 

 Do not add coolant into the overheated engine, or not the engine will be damaged. 

Prior to adding the coolant upon request, the engine shall be cooled firstly.   

 As the concentration of the additive exceeds 6%, and the sum of the additive’s 

concentration and the one of the anti-icing fluid exceeds 65%, sedimentation will 

be formed, and results in blockage of radiator’s pipe, engine’s overheat and 

inefficient sealing of water pump. 

 If the machine is stored or transported to the area 0℃ below, the cooling system 

shall be protected as per the possible minimal temperature. 

 Under lower temperature, the specific gravity of the coolant shall be examined 

frequently so as to facilitate taking enough protective measures. 

 If the coolant is polluted, the engineer is involved in overheat or radiator has foam, 

the cooling system shall be cleaned. 

 Per 1500 hours or one year, the coolant shall be discharged, and the system shall 

be cleaned. And new coolant shall be added. 

 In case the speed of adding coolant exceeds 20L/min, air bubbles of cooling 

system will be caused possibly. 

 After adding the new coolant, start the engine and uncover the radiator until the 

coolant is up to the normal working temperature and the liquid level is stable. If 

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necessary, more coolant shall be added in the system until reaching the proper 

liquid level. 

4.2 Cooling Water 

 If hard water or water with many calcium or 

manganese ions mixes with the silicon and 

phosphorus of the additive in the cooling 

system, indissoluble compound will be formed 

easily. 

 The tendency that silicon and phosphorus form 

indissoluble compound will increase with the 

increase of the water’s hardness. After a series 

of heating and cooling circulation, the hard 

water or water with many calcium or 

manganese ions will form indissoluble compound easily. 

 We suggest using distilled water or plasma water to weaken the possibility and 

severity of the formation of indissoluble compound.    

ppm= number of particles 

per one million

. 

 Using the water that meets this requirement not always prevent the formation of 

the indissoluble compound, but reducing the rate of deposition for eligible level. 

4.3 Anti-icing Fluid 

 The coolant shall adopt the eligible water and shall contain about 30% anti-icing 

fluid so as to maintain the operation temperature of water pump’s cavity for a 

higher efficiency of the water pump. 

 To protect the possible minimal ambient temperature, antifreezing agent may be 

added in the coolant in advance. The amount of the antifreezing agent depends on 

the antifreezing agent purchased and possible minimal ambient temperature at the 

machine position. Nevertheless, the concentration of the antifreezing agent in the 

coolant shall not exceed 60%. Over 60%, the antifreezing protection action on the 

engine will be weakened and the possibility of precipitation formation in the 

Usable Water Minimally 

Ingredient of 

Water 

Limit gr/gal (ppm)

Chlorine 

(CL) 

Max. 2.4(40) 

Sulfate (SO

4

) Max. 5.9(110) 

Total 

hardness 

Max. 10(170) 

Total 

 

granularity 

Max. 20(340) 

PH value 

5.5~9.0 

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cooling system will be increased. 

 Try best to buy anti-icing fluid with less silicate and proper coolant additive for 

heavy diesel engine. 

 Add properly anti-icing fluid additive 

Adding the anti-icing fluid as make-up liquid into the cooling system’s liquid is a 

kind of unacceptable method. In this way, the concentration of the anti-icing fluid in 

the coolant will be increased. The mixture of water and antifreezing agent shall be 

added into the cooling system. 

Refer to the following table to determine the concentration of the anti-icing fluid 

(only as reference, please see the user’s manual of anti-icing fluid for details) 

Concentration of Anti-icing Fluid 

Protection 

Temperature 

Concentration 

-15℃ above 

30% anti-icing fluid, 70% 

water 

-23℃above 

40% anti-icing fluid, 60% 

water 

-37℃above   

50% anti-icing fluid, 50% 

water   

-51℃above 

60% anti-icing fluid, 40% 

water 

 Ancillary coolant additive 

The coolant additive is used to prevent rust, dust, pitting corrosion and corrosion 

of the engine’s parts due to contact with the coolant. Most anti-icing fluid has no 

enough ancillary coolant additive. 

In the coolant, the additive or corresponding liquid of proper amount shall be 

added. The coolant cannot be used separately, except the anti-icing fluid with the 

additive above. Under this circumstance, the additive may not be added. Nevertheless, 

in the process of maintenance, the additive shall be added.