SANY LATIN AMERICA
4-83
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
4.6.2
Swing holding brake
●
Port PG is connected with the pilot gear pump directly, and a pressure of 3.9MPa is main-
tained.
ZX215-1002083
a
5
1
6
7
M
PX
PG
SH
Pump
Main valve
●
Otherwise, no pressure is generated at port PX, and port PG is shut off from chamber a be-
neath piston (7). Brake piston (7) is pushed down by brake spring (1). Disc (5) and plate (6)
are pushed together, and the brake is applied.
ZX215-1002084
a
5
1
6
7
M
PX
PG
SH
Pump
Main valve
●
Port SH is connected with port PX of the main valve. Once any movement other than travel
is applied on the main valve, pressure will be generated at port PX, and port PG is intercon-
nected with chamber a beneath piston 7. The pressurized oil compresses brake spring (1)
and pushes the brake piston up. Disc (5) is separated from plate (6), releasing the brake.
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