SANY LATIN AMERICA
6-40
SY195/205/215/225C9 Crawler Hydraulic Excavator
Testing and Adjusting
Shop Manual - June 2013
6.17
Residual Pressure in Hydraulic Circuit - Release
NOTE: Even if the swing motor circuit and
the travel motor circuit are free from re-
sidual pressure, they will be in
fl
uenced by
the internal pressure of hydraulic tank. The
breather valve must therefore be opened
to release pressure prior to such operation.
1. Stop the engine, loosen the butter
fl
y nut on
the breather valve, and press the release
button to release the pressure in hydraulic
tank.
2. Turn the engine start switch to the ON
position and operate the control levers for
several times.
●
The pilot lock valve must be energized.
Operate the control levers with the en-
gine start switch in the ON position.
●
The pressure in accumulator will be
released after the control levers have
been operated 2 or 3 times.
3. Start the engine and keep the engine run-
ning at low idle for about 10 seconds in
order to increase the pressure in accumu-
lator. Stop the engine.
4. Repeat the above step 2 through step 3
several times.
CAUTION
●
Release the residual pressure in the hy-
draulic circuit before disconnecting the
lines between the hydraulic cylinders
or between the hydraulic motor and the
control valve.
https://www.tractormanualpdf.info/