CG938H Wheel Loader. Manual - part 29

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permanent and temporary shear, the improver of viscosity index loses its viscosity 

efficiency. 

z  The oil for transmission box and transmission system cannot be used for the engine, or 

not the service life of engine shall be shortened. 

z  This machine adopts Mobil Delvac Super (the level is SAE15W-40). 

6.4 Differential Gear and Final Transmission Fluid 

z  In order to attain optimal service life and performance of the parts of the front and rear 

axles, the oil of proper viscosity shall be chosen. The differential gear and final 

transmission fluid recommended by the SICHUAN CHENGDU CHENGGONG 

CONSTRUCTION MACHINERY CO., LTD. is the one in conformity with the API GL-5 

code. 

z  This machine adopts Mobilube GX

 HD80W-90

. 

6.5 Grease 

There are many kinds of grease recommended by the SICHUAN CHENGDU 

CHENGGONG CONSTRUCTION MACHINERY CO., LTD. They are applicable different 

conditions: 

z  MPGM 

MPGM is applied to heavy-duty roller bearing and joints. The high-pressure grease 

enables the machine to have its longest service life. Under NLGI NO.2 is applicable to the 

conditions of most kinds of temperature. 

If MPGM grease is not available, the multi-purpose grease containing 3%~5% 

molybdenum may be used. 

z  It is recommended to use MPGL (for non-high pressure area). 

The NLGI NO.2 grease is used for automatic light-load high-temperature lubrication 

(175 ). The grease serves good mechanical stabilit

℃

y, anti-oxidation and antirust functions, 

and good separation torque. If this kind of grease is not available, the similar multi-purpose 

grease may be used. 

z  This machine adopts molybdenum disulfide lithium-based grease or 3# and 4# 

calcium-based grease. 

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6.6 Braking Fluid 

This machine adopts hydraulic braking system and does not require the braking fluid 

separately. The liquid for the braking system is same as the one for the hydraulic system. 

All kinds of operation oil shall be cleanly. The oil for hydraulic system shall meet 

the requirements of NAS9 level. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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VII    Viscosity and Full Capacity of Operation Oil

 

7.1 Viscosity and Temperature Range of Operation Oil   

Specification and No. 

Type 

The brand number added as the 

product that has an export 

destination to a non-low 

temperature area 

The brand number added as the 

product that has an export 

destination to a low temperature 

area 

Oil for torque converter 

and transmission box 

SAE 15W-40 Mobil Delvac Super 

1300 

  Mobil Delvac MX 15W-40 

Axle lubricant 

HD80W-90(Mobilube HD 80W-90)

Same as left column 

Hydraulic oil 

Hydraulic oil 

(Mobil DTE 25) 

Hydraulic oil 

(Mobil DTE 15M) 

Common axle 

DOT 3 Mobil Super Heavy Brake 

Fluid 

Same as left column 

Air-pushing 

oil brake 

Hydraulic oil (Mobil Delvac 

Hydraulic 10W) 

Same as left column 

Br

ak

e 

oil 

W

et 

axl

e 

Hydraulic 

brake 

/ / 

Engine oil   

0# light diesel fuel 

-20# light diesel fuel 

Grease 

NLGI 2 lithium-based (Mobilgrease 

HP 222) 

Same as left column 

Engine oil 

SAE 15W-40 Mobil Delvac Super 

1300 

  Mobil Delvac MX 15W-40 

 Anti-icing fluid 

Mobil Antifreeze 

(Clear water 40%+antifreeze 60%)

Mobil Antifreeze 

(Clear water 20%+antifreeze 

80%) 

7.2 Full Capacity of System 

 

Full Capacity (approximation) 

Oil box or system 

Liter   

Cooling system 

33 

Fuel box 

175 

Engine oil 

13-15 

Transmission fluid 

45 

Differential gear and final 

transmission fluid (single unit) 

40 

Hydraulic oil box 

105 

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VIII S.O.S 

S.O.S method is adopted to examine the conditions of the machine and whether the 

machine requires to be maintained. As each kind of oil is sampled, the lubricant shall be 

heated and mixed evenly so as to ensure that the sample oil has representativeness. 

8.1 Acquisition of Sample Oil for S.O.S 

In order to realize the good preventive maintenance scheme, we suggest adopting the 

S.O.S method to examine the conditions of the machine and whether the machine requires to 

be maintained. As each kind of oil is sampled, the lubricant shall be heated and mixed evenly 

so as to ensure that the sample oil has representativeness. 

For acquisition of sample oil for S.O.S, several methods are available. 

z 

Insert sample oil doper into the oil groove. 

z 

Use sample oil valve. 

z 

Use discharged oil as the oil is replaced. 

Note: We suggest adopting the first or second method. If two methods do not work, the 

discharge oil may be used. 

As the discharged oil is adopted as the sample oil, the oil cannot be sampled from the oil 

discharged firstly or lastly because it is not mixed evenly and has no representativeness. 

8.2 S.O.S (Regular Sample Oil) Analysis 

The regular sample oil analysis is composed of three basic tests: 

z 

Wear element analysis. 

z 

Chemical and physical tests. 

z 

Oil status analysis. 

The wear element analysis adopts spectrophotometric method to examine the wear 

degree of components by measuring the concentration of the wear mental elements in the 

sample oil (unit: number of particles per one million). If the test results deviate from the 

concentration range of normal wear, we may confirm that the part will be disabled soon. 

By the chemical and physical tests, the proportion of water, fuel, and antifreezing agent 

in the lubricant may be examined. 

The oil status analysis adopts infrared analysis method to determine whether the