LiuGong CLG835H, Service Manual

Page: 77 / 764

2-39
January 24, 2017 Structure Function Principle
CLG835H Cooling system
Cooling system of this machine adopts hydraulic to drive fan and adopts suction mode to cool. The
system adopts forced closed circulating water cooling system. Working principle of system is as follows:
water outlet at lower part of cooler is connected with water inlet of engine oil cooler via water hose, water
outlet of engine oil cooler is connected with water pump via water hose, water pump pumps coolant into
cylinder block water passage, coolant firstly cools cylinder through water jacket inside cylinder block,
then flows up to cool cylinder head, and is collected by water outlet header pipe to reach thermostat.
When coolant temperature is lower than 84°C(183.2°F), thermostat is closed, and all coolant is
bypassed to water pump inlet. At the moment, coolant is only circulating between cylinder block and
cylinder head, so that warm-up can be quickly realized. When coolant temperature is above
82°C(179.6°F), thermostat starts to be opened, part of coolant flows to water inlet at upper part of cooler
and enters radiator to be cooled by cooling fan. When coolant temperature is above 95°C(203°F),
thermostat is totally opened, bypass hole is closed, and all coolant is cooled by radiator. The coolant
flowing direction at the moment is shown in the chart.
1. Engine 2. Water radiator
P18P00048
Engine water circulation
1
2