Golden Dragon XML6125CLE Repair Manual Download

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General Instructions

GI-6126J12-01

GI-17

a low temperature. It reflects the minimum environmental temperature where gear oils are
used.

Resistance to wear: it is the ability of gear oils to keep oil films free of damage. Such ability
is particularly important to gear oils.

Brand and specification of gear oils

Standards comparable to API (American Petroleum Institute) standards are adopted in China,

i.e. gear oils are divided into general vehicle gear oils (SH0350-92), medium-duty vehicle gear oils
(GL-4) and heavy-duty vehicle gear oils (GL-5).

General vehicle gear oils (SH0350-92) have three viscosity designations, i.e. 80W/90,
85W/90 and 90.

Medium-duty vehicle gear oils (GL-4) normally include five viscosity designations, i.e. 75W,
80W/90, 90 and 85W/140.

Heavy-duty vehicle gear oils (GL-5) (GB13895—92) are applicable to gear transmissions
and hyperbolic gear transmissions in various rough working conditions like high-speed
impact loads and low-speed high torsion. They include the 75W, 80W/90, 85W/90, 85W/140,
90 and 140 viscosity designations.

Selection of vehicle gear oils

The varieties and grades of gear oils are selected according to the load of gear transmission.



Heavy-duty vehicle gear oils must be adopted in case the surface contact pressure of
gears exceeds 3,000Mpa; sliding speed reaches 10m/s and working temperature of oils
reach 120 to 130

℃

. For instance, the lubricating oils of driving axles of hyperbolic

gears of imported cars and engineering trucks.



Medium-duty vehicle gear oils may be adopted in case the surface contact pressure of
gears is below 3,000Mpa; sliding speed is below 10m/s and working conditions are not
severely rough. For instance, medium-duty vehicle gear oils may be adopted for the rear
driving axle of Dongfeng EQ1090 trucks even if it is driven by hyperbolic gears because
the load is not particularly heavy.



General vehicle gear oils are normally adopted for general helical gears if the load is
light. For instance, general vehicle gear oils may be adopted for rear driving axle of
Jiefang CA1091.

Choose the designation of viscosity of gear oils according to the climatic conditions where
the vehicle is used.



5W, 80W and 85W correspond to the minimum applicable temperatures of -40

℃

, -26

℃

and -12

℃

respectively. Choose them with reference to the minimum temperature where

the vehicle is used.



90# gear oils can be adopted under normal circumstances. #140 gear oils may be
adopted in a highly hot region and for heavily loaded trucks.



Hydraulic oils

Working conditions and main characteristics of hydraulic oils

A hydraulic system is installed for dump trucks, automobile cranes, loaders and various types of

engineering  machineries  and  the  working  medium  is  hydraulic  oil.  The  working  conditions  of
hydraulic  oils  require  that  the  oils  must  have  sound  shearing  stability,  wear  resistance,  oxidation
stability  and  fluidity.  Most  importantly,  their incompressibility  must  be guaranteed. The  factor  that
influences the incompressibility of hydraulic oils most is their solubility of air. If the air solubility is
too  high  at  a  certain  temperature  and  pressure  but  would  become  lower  in  some  other  working
conditions, air bubbles may be created in the hydraulic oils. The compressibility of air bubbles will

Golden Dragon XML6125CLE, Repair Manual

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