SANY LATIN AMERICA
6-28
SY195/205/215/225C9 Crawler Hydraulic Excavator
Testing and Adjusting
Shop Manual - June 2013
NOTE: The boom relief valve cannot be ad-
justed.
3
ZXT225-1104002
1
ZXT215-1004004
ZX215-1004029
5
4
5. Measurement of travel pressure at relief
1) Start the engine and lock the travel
mechanism.
NOTE: Place the pin (1) between the
sprocket and the track frame to lock the
travel mechanism.
2) Measure the hydraulic pressure when
the engine is running at high idle and
the travel circuit is in relief condition.
NOTE: The hydraulic pressure indicat-
ed is the pressure when the main relief
valve is in relief condition. When the
travel circuit is in relief condition, the
pressure indicated is always the pres-
sure at high relief.
6.11.2 Adjusting
1. Adjustment of main relief pressure
NOTE: If the high relief pressure is abnor-
mal, adjust the high pressure setting of the
main relief valve (3) as per the following.
1) Disconnect the pilot hose.
2) Loosen the locknut (4). Turn the adjust-
ment screw (5) to adjust the pressure.
Pressure rises as the screw turns right.
Pressure drops as the screw turns left.
Each turn of the screw equals about:
12.5 MPa {128 kgf/cm²}
Locknut:
53.5±4.9 N·m {5.5±0.5 kgf·m}
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