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January 24, 2017
Structure Function Principle
CLG835H
Work hydraulic system
6. Floating descending position of boom union
When the control lever is shifted to floating lowering position (the lever is pushed to front end), the pilot
pressure oil acts on a2 end of the boom 8, as the pilot pressure in floating lowering position is high than
that of boom lowering position, the boom valve rod 8 works in leftmost position (floating position), at this
time, the pressure oil (not via the pressure compensation valve 7) from P port is directly connected with
A2 & B2 port of the big & small cavity of the boom and the oil return port T of the control valve, the bucket
descends rapidly under the effect of its dead weight to realize the floating lowering. At this time, the pres-
sure of load sensitive oil line is zero, that is, the pump, in low pressure standby state, hardly supplies oil
for the system. The rapid descending of the boom results in negative pressure in small cavity of the
boom. The boom descending oil refilling valve is opened to reduce the negative pressure of small cavity.
P18H00024
Summary of Contents for CLG835H
Page 2: ......
Page 4: ...Contents January 24 2017 CLG835H...
Page 6: ...1 2 General Information January 24 2017 CLG835H...
Page 38: ...1 34 Machine Inspection Table January 24 2017 CLG835H...
Page 156: ...3 2 Power Train System January 24 2017 CLG835H...
Page 214: ...3 2 Power Train System January 24 2017 CLG835H...
Page 272: ...3 60 Testing and adjustment January 24 2017 Power Train Test CLG835H...
Page 276: ...4 4 Hydraulic System January 24 2017 CLG835H...
Page 552: ...6 2 Driver s Cab System January 24 2017 CLG835H...
Page 608: ...7 2 Structure January 24 2017 CLG835H...
Page 662: ...8 4 Electrical System January 24 2017 CLG835H...
Page 677: ...8 19 January 24 2017 Structure Function Principle CLG835H Power System P18E00014...