LiuGong CLG835H, Руководство по обслуживанию

Страница: 336 / 764

4-64
Structure Function Principle
January 24, 2017
Hydraulic cooling system CLG835H
6. After the gas in the front/rear axles is dis-
charged, continuously pull up and press
down the switch of parking brake for 3-4
times, and discharge the gas out of parking
brake.
Check for the performance of parking
brake
1. Adjust the tire pressure of machine to the
specified value, and lay down the bucket
levelly at approx. 300mm\11.8in from the
ground. And confirm the machine have the
performance of good service brake.
2. Start the engine and load 5 tons weight and
align the machine at 15% slope (8° 32') and
the pavement shall be flat and dry.
3. Pull the parking brake button, stop the
machine and place the shift control lever to
neutral position, and the engine is not stalled.
Hydraulic cooling system
A: Overview-components and position
This machine is equipped with separate
hydraulic fan motor cooling system, which
acquires oil temperature and water temperature
signals of torque converter and temperature
signal of air-air inter-cooler, and controls the
speed of fan with program. This not only meets
needs for system cooling, but also achieves the
purpose of energy saving. The system consists
of cooling pump, motor, solenoid directional
valve and other pipes (refer to the maintenance
manual of electrical system for electrical
controls).
System's features:
1. With electric adjustment, control pressure of
proportional relief valve with signal of current
so as to control inlet flow of motor and adjust
fan speed.
2. The proportional relief valve integrates the
reversing valve, when the relief valve is
closed normally, it guarantees the fan works
at full speed in the case of no electrical sig-
nal;
3. The fan is driven in reverse direction to make
fan work reversely, dredging the impurities
deposited on the radiator;
Since there is high pressure oil stored in the
wheel brake, special care must be taken
when bleeding. It is not allowed to loosen
fully the bleeding valve. Keep the eyes and
body away from the bleeding valve in order to
avoid injuries caused by spraying oil liquid.
You shall frequently inspect the performance
of parking brake so as to guarantee parking
safety and effect of emergency brake. Guar-
antee parking safety and effect of secondary
brake.