SANY Crawler Hydraulic Excavator (SY195C9, SY205C9, SY215C9, SY225C9). Shop Manual (2013) - page 9
Structure and Function
4.5.3
Section view
273×10
B
A
153
(Po)
XAtr
561
TRAVEL
TRAVEL R
STRAIGHT
C
C
HR
273×12
XBs
XAtl
TRAVEL L
SWING
252
D
D
Dr8
PnS
XAb2
XBbl
BOOM1
BOOM2
977
E
E
978×2
AbR
XAk
XBo
BUCKET
OPTION
F
F
AoR
AkR
XBa1
XBa2
ARM1
ARM2
G
AR
G
(XBp1)
(BYPASS CUT1)
PnA2
Dr7
H
BYPASS CUT2
AaR
252
O
O
PCV1
H
AaR
602
A
B
XBa2
(XBp1)
Dr3
View O-O
274×4
CCo
Pns
(P5)
Dr6
Dr7
PnA2
CCk
P
P
210
153
561
(P5)
Viw P-P
XAa2
XBk
273×12
273×10
XBp2
PCk
ZX225-1102035
4-70
Structure and Function
Section A-A, N-N
N
543
101
159
541
542
166
550
(PTa)
N
XAtL
XBtL
XBb1
XAbL
XAk
PCk
XBk
XBa2
XAa2
CCo CCk
514
521
561
551
551
561
521
514
View A-A
151
168
151
168
151
168
PB
156
2-156
View N-N
ZX225-1102036
4-71
Structure and Function
Section B-B
153
561
P2
102
(P3)
R1
975
975
XBtr
XAtr
975
XAs
XBs
975
Psp
XAb2
975
(XAo)
(XBo)
975
975
XAb1
XBa1
975
XBp2
(XBp1)
975
975
165
165
165
View B-B
ZX225-1102037
4-72
Structure and Function
Section C-C (Travel right, travel straight)
154
164
201
TRAVEL
TRAVEL
201
RIGHT
STRAIGHT
336
336
332
XAtr
332
335
323
321
335
320
332
332
332
MR
261
261
308
163
601
314
Pz
165
512
163
Atr
522
511
553
521
551
CP1
CMR1
561
562
165
562
163
163
Btr
CMR2
163
553
522
512
159
264
159
264
204
XBtr
204
(PTa)
164
View C-C
154
ZX225-1102038
4-73
Structure and Function
Section D-D (Swing, travel left)
201
SWING
TRAVEL LEFT
336
201
336
332
XBs
XAtL
332
335
335
321
321
320
320
332
261
332
314
261
305
161
163
163
AtL
As
511
254
521
C2
551
561
BtL
251
Bs
165
Dr2
264
264
XAs
XBtl
204
204
163
163
View D-D
ZX225-1102039
4-74
Structure and Function
Section E-E, L-L (Boom 1, boom 2)
202
BOOM2
BOOM1
336
201
332
XAb2
XBb1
336
339
332
327
335
321
326
320
602
332
332
261
261
L
L
161
158
511
Dr1
PbL
521
523
CCb
CRb
552
561
551
561
513
165
511
307
521
LCb
163
Xb2
551
551
561
561
Bb
311
161
303
163
264
261
602
332
XAb1
204
BbR
320
329
158
339
332
336
202
Psp
SWING
PRIORITY
View E-E
View L-L
ZX225-1102040
4-75
Structure and Function
Section F-F (Option, bucket)
259
164
201
201
OPTION
BUCKET
336
336
332
(XBo)
332
335
335
321
321
320
320
602
332
AkR
332
261
261
304
604
163
209
971×4
165
Ak
309
(Ao)
163
163
511
511
521
521
LCo
551
551
561
561
(Bo)
Bk
163
165
971×4
209
163
264
602
604
264
(XAo)
206
204
BkR
211
164
BoR
XBk
561
154
258
PCk
View F-F
ZX225-1102041
4-76
Structure and Function
Section G-G (Arm 1, arm 2)
201
201
336
336
332
332
XBa1
XBa2
335
335
321
321
320
320
Dr3
257
332
AR
332
261
261
306
L
L
158
163
165
513
162
523
152
CRa
561
165
552
251
162
152
302
511
521
551
LCAT2
256
561
551
163
561
521
R2
511
165
163
264
264
XAa2
602
XAa1
BaR
204
205
View G-G
ZX225-1102042
4-77
Structure and Function
Section H-H (Bypass cut 1, bypass cut 2)
612
169
162 152 158 154 164 152 162 162 152 164 154 158 152 162 164 154 169
612
162 152
PCV2
PCV1
XBp2
(XBp1)
203 333 331 372 373 337 331 262
310
165
165
310
163
262 331 337 373 372331333 203
View H-H
ZX225-1102043
4-78
Structure and Function
Mounting
Mounting
NO.
Part name
Q’ty
NO.
Part name
Q’ty
torque (N·m)
torque (N·m)
SPOOL ASS’Y, travel
101
BLOCK, valve A
1
308
1
straight
102
BLOCK, valve B
1
309
SPOOL, option
1
13~17
151
PLUG
3
310
SPOOL, bypass cut
2
34~39
152
PLUG
7
311
SPOOL, swing priority
1
220~250
153
PLUG
3
320
SPRING
9
69~78
154
PLUG
6
321
SPRING
8
7.4~9.8
156
PLUG, orifice
3
322
SPRING
1
7.5~10
158
PLUG
5
323
SPRING
1
10~14
159
PLUG
3
326
SPRING
1
161
O-RING
3
327
SPRING
1
162
O-RING
7
329
SPRING
1
163
O-RING
21
331
SPRING SEAT
4
164
O-RING
7
332
SPRING SEAT
22
165
O-RING
14
16~18
333
FLANGE SOCKET
2
166
O-RING
1
335
STOPPER
9
168
O-RING
3
16~18
336
FLANGE SOCKET
11
169
O-RING
2
337
STOPPER
2
201
COVER, spring
9
339
STOPPER
2
202
COVER, spring
2
372
SPRING
2
203
COVER, spring
2
373
SPRING
2
204
COVER, spool
7
511
VALVE, cone
8
205
COVER, spool
1
512
VALVE, cone
2
206
COVER, spool
1
513
VALVE, cone
2
209
FLANGE
2
514
VALVE, cone
2
210
PLATE
1
521
SPRING
10
211
PISTON
1
522
SPRING
2
49~65
251
VALVE, logic control
2
523
SPRING
2
OPTION ASS’Y, lock
9.8~14
252
2
541
BALL
1
valve
254
VALVE GP, swing logic
1
542
SPRING SEAT
1
256
VALVE GP, arm 2 logic
1
543
SPRING
1
CHECK VALVE ASS’Y,
69~78
257
1
25~29
550
PLUG
1
arm regeneration
258
PLUG
1
230~260
551
PLUG
11
259
PLUG
1
230~260
552
PLUG
2
261
O-RING
11
130~150
553
PLUG
2
4-79
Structure and Function
Mounting
Mounting
NO.
Part name
Q’ty
NO.
Part name
Q’ty
torque (N·m)
torque (N·m)
262
O-RING
2
561
O-RING
17
264
O-RING
9
562
O-RING
2
25~34
273
SCREW, hex, S,H,C
44
69~78
601
VALVE, main relief
1
98~120
274
SCREW, hex, S,H,C
4
69~78
602
VALVE, port relief
6
301
SPOOL, travel
2
120~140
604
VALVE, port relief
2
302
SPOOL ASS’Y, arm 1
1
69~78
612
PLUG
2
303
SPOOL ASS’Y, boom 1
1
49~65
971
SCREW, hex, S,H,C
8
304
SPOOL, bucket
1
140~180
975
SCREW, hex, S,H,C
10
305
SPOOL, swing
1
977
PLATE name
1
306
SPOOL, arm 2
1
978
PIN
2
307
SPOOL, boom 2
1
4-80
Structure and Function
4.6 Hydraulic System, Part 3
4.6.1 Swing motor
NOTE: For the location of the swing motor on the machine, see “Hydraulic equipment layout” on
page 4-24.
L
SH
PG
PB
B
IP
PA
A
1
M
DR
2
ZX215-1002081
A: Main oil port
1. Relief valve
B: Main oil port
2. Reverse prevention valve
M: Oil complement port
For more technical information about the
PA: Pressure detection port
swing motor, see “Swing motor” on page 3-6.
PB: Pressure detection port
DB: Lubricating port
PG: Brake release port
SH: Brake direction port
L: Oil level stick
IP: Gear oil feed port
4-81
Structure and Function
7
6
A-A
A
8
9
5
A
4
10
11
3
12
2
13
1
ZX215-1002082
1) Spacer
6) Check valve spring
11) Plate
2) Casing
7) Check valve
12) Piston
3) Disc
8) Oil distribution plate
13) Drive shaft
4) Brake spring
9) Cylinder
5) Shell
10) Brake piston
4-82
Structure and Function
4.6.2 Swing holding brake
Ɣ Port PG is connected with the pilot gear pump directly, and a pressure of 3.9MPa is main-
tained.
M
Pump
a
1
Main valve
7
PX
PG
6
SH
5
ZX215-1002083
Ɣ 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.
M
a
Pump
1
Main valve
7
PX
PG
6
SH
5
ZX215-1002084
Ɣ 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.
4-83
Structure and Function
4.6.3 Relief valve portion
NOTE: For the location of the relief valve on
the swing motor, see “Swing motor” on page 4-81.
Structure
Ɣ The relief valve portion consists of relief
valves (1) and (2), check valves (3) and (4).
Function
Ɣ When the machine is in the swing holding
mode, control valve (5) closes the motor
outlet circuit, but the motor rotation contin-
ues due to inertial force. The motor output,
therefore, is abnormally increased, result-
ing in motor damage.
Ɣ In order to avoid the motor damage, the
relief valve relieves the abnormally high
pressure to port (M) from the motor outlet
side (high-pressure side) of the motor.
4-84
Structure and Function
Operation
1.
When swing begins (suppose pressur-
ized oil enters Port A)
From port M
1
2
Ɣ
When the swing control lever is operated
for right swing, pressurized oil from the
pump is supplied to port (A) via control
valve (5).
Ɣ
The pressure on port (A) rises, the starting
torque is generated in the motor, and the
motor is activated.
4
3
Ɣ
The pressurized oil from the outlet port of
the motor passes from port (B) through the
C
control valve (5) and returns to the tank.
A
B
5
ZX215-1002085
2.
When swing stops
Ɣ
When the swing control lever is neutral-
From port M
ized, the supply of pressurized oil from the
1
2
pump to port (A) is cut off.
Ɣ
The pressurized oil from the motor outlet
can't return to the tank since the return cir-
cuit to the tank is closed from control valve
(5). Thus, pressure at port (B) rises.
Ɣ
Swing resistance is generated on the mo-
tor and hence the brake starts working.
4
3
Ɣ
Pressurized oil will be relieved when the
C
pressure on port (B) rises to the set pres-
sure of relief valve (2).
A
B
Ɣ
A high braking torque is applied on the mo-
5
tor, thereby stopping the motor.
ZX215-1002086
Ɣ
When relief valve (2) is being actuated, the
relieved pressurized oil and the pressur-
ized oil from port (M) are fed to port (B) via
check valve (4).
Ɣ
Above prevents cavitation on port (B).
4-85
Structure and Function
4.6.4 Reverse prevention valve
4.6.4.1 Operation drawing
NOTE: For the location of the reverse prevention valve on the swing motor, see “Swing motor” on
page 4-81.
A
T1
T2
B
1
2
3
4
7
6
5
Swing
T
motor
B
A
Swing control valve
ZX215-1002087
1) Valve body
5) Spool (B side)
2) Spool (A side)
6) Spring (B side)
3) Spring (A side)
7) Plug
4) Plug
4-86
Structure and Function
4.6.4.2 Explanatory drawing of effects
With reversal prevention valve
:Without reversal prevention valve
Reversal pressure
Pressure MA
Containment pressure
Reversal pressure
Pressure MB
1st reversal
2nd reversal
Motor speed
Start
Brake
Reversal
Time
ZX215-1002088
Outline
Ɣ Inertia of the swing body, the backlash and
rigidity of the machinery system, and the
A
T
compression of the hydraulic oil all may
c e
D4 a D3
cause the machine to shake during swing
operation. The reverse prevention valve is
designed to reduce this effect. The valve
contributes in preventing collapsing of load
when the swing is stopped and also con-
tributes in reducing cycle time (enhances
the positioning performance, enabling you
to proceed to the next work quicker than
D1 d
NotchD2
b f
%
ever).
7
ZX215-1002089
4-87
Structure and Function
Operation
1.
When port (B) brake pressure is gener-
ated
Ɣ
Pressure (MB) is conducted to chamber (d)
$
via the notch. The pressure compresses
T
spring (6) by use of the difference in areas
F
H
'
D '
of circles (D1 > D2) of spool (5) and moves
spring (6) to the left side. Port (B) and
chamber (e) will be interconnected. Since
pressure (A) is lower than the set pressure
of spring (3), spool (2) does not move and
the pressurized oil is stopped by spool (2).
Thus the braking force is ensured.
'
G
Notch'
E
I
%
T
ZX215-1002090
2.
When motor is stopped
Ɣ
The motor rotation is reversed by the clos-
A
ing pressure generated at port (B). (1st
T
a
2
3
time: reverse rotation) Reversing pressure
is generated on port (A). Pressure (A) is
conducted to chamber (a), and spool (2)
moves spring (3) to the right side, and A
and B is interconnected. At this time, b
is interconnected with f via the orifice on
spool (5), and reversing pressure on port A
is bypassed to port T, preventing the sec-
5
d
b
f
ond reverse rotation.
B
T
ZX215-1002091
4-88
Structure and Function
4.6.5 Center swivel joint
NOTE: For the location of the central swivel joint on the machine, see “Hydraulic equipment lay-
out” on page 4-24.
Z
7
8
13
9
10
6
H
11
12
5
F
D
4
C
B
A
3
2
1
F1
H
G1
H-H
G
D1
A1
B1
C1
Z
ZX215-1002092
1) Swing shaft
8) Plug (ZG3/4)
2) Dust seal
9) Plug (ZG1/4)
3) O-ring
10) Cover
4) Swing body
11) Spacer
5) Rotating seal ij100x5
12) Gasket
6) Gasket
13) Gasket
7) Retaining ring ij 90
4-89