CG958G Wheel Loader. Manual - part 28

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Repairing and Maintenance 

I  Knowledge on Tyre Inflation  

1.1Tyre Inflation with Nitrogen (N2) 

 SICHUAN CHENGDU CHENGGONG CONSTRUCTION MACHINERY CO.，

LTD. suggests that all rubber tyres and tyres’ pressure would be inflated and 

regulated with nitrogen respectively. Nitrogen is a kind of inert gas and does not 

support combustion. 

 In order to avoid redundant nitrogen in the tyre, proper nitrogen inflation 

equipment shall be used and necessary training on application of the 

equipment is required. Improperly using the equipment may result in 

blowout of tyre possibly, even serious personal injuries and death. 

 Because the pressure of the cylinder filled with nitrogen is about 15000kPa, 

improperly using the inflation equipment will possibly result in blowout of 

tyre or damage of wheel rim. 

 Besides the function of weakening the dangerousness of the explosion, the 

inflation with nitrogen may also delay rubber’s aging and gradually wear of tyres 

(it is especially important that the tyre has expected service life (four years above). 

In addition, it may reduce the dismantling problem due to the corrosion of the 

wheel rim parts. 

 In tyre inflation, an inflation chuck that clips tightly automatically shall be 

used. The operator shall stand outside the tyre.   

 The set pressure of the modulating valve of the inflation equipment shall not 

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exceed the recommended pressure 300~340 kPa. The press of the tyre inflated 

with nitrogen shall be same as the one with air. Please consult with the tyre 

supplier for information on working pressure. 

1.2Regulation of Inflation Pressure 

 If the loader works under a cold condition, the pressure for tyre inflation at a 

warm place of 18℃~21℃ is too low. The low pressure will shorten the service 

life of the tyre. 

 Please see working and maintenance manual for the regulation of inflation 

pressure under a cold condition. 

1.3 Purchase of Tyres 

 The tyre’s specification is 23.5-25-16PR, tubeless. As the tyre requires to be 

replaced, the user may purchase the tyre of same specifications at the local store. 

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II  Standard for Screw Torque

 

Usually, fasteners will be dismantled in repairing. For reinstallation, the following 

items shall be noted: 

 The bolts and nuts dismantled from the loader shall be kept well for reinstallation. 

In case a new fastener is required, the size and grade of the new fastener shall be 

same as the old one. 

 The strength of the material is marked with number (8.8, 10.9 etc.) on the head of 

the bolt usually. The standard torque for the 8.8-grade bolt and nut is given in the 

following table. 

 

Size of 

Thread 

Standard Torque (N.m) 

M6 12±4 

M8 25±7 

M10 55±10 

M12 95±15 

M14 150±20 

M16 220±30 

M20 450±70 

M24 775±100 

M30 1600±200 

M36 2700±400 

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III  Daily Maintenance Guide

 

“Healthy examination” for the loader shall be conducted regularly or irregularly 

(examination and repairing). 

Causes of failure or lower performance of the loader shall be found out early and 

removed in time. In this way, a higher production rate and long service life may be 

attained. 

 

Grease or oil accumulated on the loader will cause a fire. Therefore when the 

loader works for some time (about 1000 hours), the grease or oil on the loader 

shall be cleaned with steam or high-pressure water.

 

 

Prior to maintenance, all joints, caps and blocks shall be wiped away.

 

 

Examine leakage carefully. For any leakage, the leakage position shall be found 

out and repaired.

 

 In case the leakage is suspected or found out, the liquid level shall be examined 

regularly. 

Caution 

In replacement of hydraulic components or pipes, the screw plug of exhaust 

valve on the hydraulic oil box shall be loosened so as to avoid the outflow of the 

oil in the hydraulic oil box. Upon the completion of repairing, the exhaust valve 

shall be fastened again, and then the engine may be started. 

 The hinging part of the frame is the central unit connecting with the front and rear 

frames. Good lubrication of the hinging part can ensure the normal and safety 

operation of the machine. 

 Regularly lubricate the pin of the rotating and hinging parts to extend the service 

life. 

 Regularly examine whether all parts have any deformation, crack or abnormal 

factor. 

 In hoisting, the lifting lug on the frame shall be used. Hoisting weak part and pin 

hole is not allowed so as to prevent them from damage. 

 As the external power source is used to start the engine, please follow the