SANY Crawler Hydraulic Excavator SY365H-9, SY365BH-9. Shop Manual (2014) - page 13

4-113

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

3. Fine control (When control lever returns)

●

When disc (5) starts to return, plunger (1)
is pushed up by the force of center spring
(3) and the pressure at port (P1).

●

Because of this, ori

ce (f) is connected to

drain chamber (D), and the pressurized oil
at port (P1) is released.

●

If the pressure of port (P1) is lowered ex-
cessively, plunger (1) is pushed down by
adjusting spring (2).

●

Orifice (f) is shut off from drain chamber
(D), and it is almost simultaneously in-
terconnected to pump pressure chamber
(PP). Pump pressure is supplied until the
pressure at port (P1) recovers to the level
equivalent to the lever position.

●

When the plunger of the control valve re-
turns, the oil in drain chamber (D)

ows in

from ori

ce (f) in the valve on the side that

is not working. The oil passes through port
(P2) and enters chamber (B) to replenish
the chamber with pressurized oil.

4. At full stroke

●

Disc (5) pushes down piston (4), and re-
tainer (9) pushes down plunger (1).

●

Ori

ce (f) is shut off from drain chamber (D),

and is interconnected to pump pressure
chamber (PP).

●

Therefore, the pilot pressure oil from
the self pressure reducing valve passes
through orifice (f) and flows to chamber
(A) from port (P1) to push the control valve
plunger.

●

The oil returning from chamber (B) passes
from port (P2) through ori

ce (f) and

ows

to drain chamber (D).

ZX365-1304117

Control valve

Pilot

pump

ZX215-1002118

Control valve

Pilot

pump

Fig. 4-108

Fig. 4-109

4-114

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

4.6.12 Travel pilot valve

ZX215-1002119

P: From pilot pump
P1: L.H. reverse
P2: L.H. forward
P3: R.H. reverse

P4: R.H. forward
P5: Travel signal
P6: Travel signal
T: To tank

Fig. 4-110

4-115

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

ZX215-1002120

37~30Nm

65~45Nm

13~11Nm

C-C

8~6Nm

B-B

(1) Plate
(2) Body
(3) Piston
(4) Collar

(5) Center spring
(6) Adjusting spring
(7) Valve

Fig. 4-111

4-116

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

ZX215-1002121

Control Valve

Pilot pump

ZX215-1002122

5
4

Control Valve

Pilot pump

4.6.12.1 Operating principle

1) When in neutral

●

Ports (A) and (B) of the control valve and
ports (P1) and (P2) of the pilot valve are
connected to drain chamber (D) via ori

(f) in spool (1).

2) Fine control (Neutral to

ne control)

●

When piston (4) is pushed by lever (5), re-
tainer (9) is pushed, and plunger (1) is also
pushed by adjusting spring (2), and moves
downward.

●

When orifice (f) is shut off from drain
chamber (D), it is almost simultaneously
interconnected to pump pressure chamber
(PP).

●

Pilot pressurized oil of the control pump is
led to port (A) from port (P1) via ori

ce (f).

●

When the pressure at port (P1) becomes
higher, plunger (1) is pushed back and
orifice (f) is shut off from pump pressure
chamber (PP). At almost the same time, it
is connected to drain chamber (D) to re-
lease the pressure at port (P1).

●

As a result, plunger (1) moves up and
down until the force of adjusting plunger (2)
is balanced with the pressure at port (P1).

●

The relationship of the position of plunger
(1) and body (10) [ori

ce (f) is in the middle

between drain chamber (D) and pump
pressure chamber (PP)] does not change
until retainer (9) contacts plunger (1).

●

Adjusting spring (2) contracts in proportion
to the stroke of the control lever.

●

Pressure at port (P1) also rises in propor-
tion to the stroke of the control lever.

●

In this way, the control valve spool moves
to a position where the pressure of cham-
ber (A) (same as pressure at port (P1)) and
the force of the return spring of the control
valve spool are balanced.

Fig. 4-112

Fig. 4-113

4-117

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

ZX215-1002123

f’

Control Valve

Pilot pump

ZX215-1002124

f’

5
4

Control Valve

Pilot pump

3) Fine control (When control lever returns)

●

When lever (5) starts to return, plunger (1)
is pushed up by the force of center spring
(3) and pressure at port (P1).

●

Because of this, ori

ce (f) is connected to

drain chamber (D), and the pressurized oil
at port (P1) is released.

●

If the pressure of port (P1) is lowered ex-
cessively, plunger (1) is pushed down by
adjusting spring (2).

●

Ori

ce (f) is shut off from drain chamber (D),

and it is almost simultaneously intercon-
nected to pump pressure chamber (PP).

●

Pump pressure is supplied until the pres-
sure at port (P1) recovers to the level
equivalent to the lever position.

●

When the spool of the control valve re-
turns, the oil in drain chamber (D)

ows in

from ori

ce (f) in the valve on the side that

is not working. The oil passes through port
(P2) and enters chamber (B) to replenish
the chamber with pressurized oil.

4) At full stroke

●

Lever (5) pushes down piston (4), and re-
tainer (9) pushes down plunger (1).

●

Ori

ce (f) is shut off from drain chamber (D),

and is interconnected to pump pressure
chamber (PP).

●

Therefore, the pilot pressure oil from
the self pressure reducing valve passes
through orifice (f) and flows to chamber
(A) from port (P1) to push the control valve
spool.

●

The oil returning from chamber (B) passes
from port (P2) through ori

ce (f) and

ows

to drain chamber (D).

Fig. 4-114

Fig. 4-115

4-118

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

4.6.13 Solenoid valve

W365-1304125

Fig. 4-116

(1) Solenoid valve block

(2) Accumulator

(3) High-speed travel solenoid valve

(4) Backup valve

(5) Backup valve

(6) Bucket con

uence solenoid valve

(7) Backup

(8) Pilot pressure solenoid valve

P1: To pilot

lter

P2: To main valve port G

T: To oil tank

A1: To swivel joint port X

A2: To pilot oil circuit block P

4-119

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

4.6.14 PPC accumulator

ZX215-1002126

(1) Gas plug

(2) Shell

(3) Poppet

(4) Holder

(5) Bladder

(6) Oil port

Speci

cations

Gas capacity: 300 cc (for PPC)

Fig. 4-117

4-121

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

4.6.15 Pilot oil

lter

ZX215-1002127

Model

Pressure

Precision

(1) Nameplate
(2) Head cover
(3) O-ring
(4) Seal ring
(5) Filter
(6) Casing

Speci

cations

Max. delivery: 40 L/min
Filter

neness: 10 um

Operating pressure: 20 Mpa
Max. operating pressure: 40 Mpa
Pressure loss: 0.05 Mpa
Max. allowable pressure difference: 1 Mpa
Speci

cation of inlet/outlet port O-ring: 30

3.1

Fig. 4-118

4-122

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

4.6.16 Hydraulic cylinders

Boom cylinder

Arm cylinder

Bucket cylinder

ZX335-1002035

367N·m

56.9±10.7N·m

7960N·m

ZX335-1002036

711N·m

96.6±18.2N·m

22200N·m

ZX335-1002037

367N.m

56.9±10.7N.m

9550N.m

Fig. 4-119

Fig. 4-120

Fig. 4-121

4-123

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

Unit: mm

No.

Check Item

Criteria

Remedy

Clearance be-
tween piston rod
and bushing

Cylinder

Standard

size

Tolerance

Standard

clearance

Clearance

limit

Replace the
bushing.

Shaft

Hole

Boom

100

-0.012

+0.222

0.083-0.312

0.412

-0.034

+0.047

Arm

120

-0.012

+0.222

0.083-0.312

0.412

-0.047

+0.047

Bucket

100

-0.012

+0.258

0.078-0.334

0.434

-0.034

+0.048

Clearance be-
tween piston rod
support pin and
bushing

Boom

100

-0.036

+0.25

0.086-0.321

1.0

Replace the
pin or bush-
ing.

-0.071

+0.05

Arm

110

-0.036

+0.25

0.086-0.321

1.0

-0.071

+0.05

Bucket

-0.036

+0.25

0.086-0.321

1.0

-0.071

+0.05

Clearance be-
tween cylinder
bottom support
pin and bushing

Boom

-0.036

+0.25

0.086-0.321

1.0

-0.071

+0.05

Arm

110

-0.036

+0.25

0.086-0.321

1.0

-0.071

+0.05

Bucket

-0.036

+0.25

0.086-0.321

1.0

-0.071

+0.05

4.6.16.1 Lubrication at every 500 service hours

Unit: mm

No.

Check Item

Criteria

Remedy

Clearance be-
tween piston rod
and bushing

Cylinder

Standard

size

Tolerance

Standard

clearance

Clearance

limit

Replace the
bushing.

Shaft

Hole

Boom

100

-0.012

+0.222

0.083-0.312

0.412

-0.034

+0.047

Arm

120

-0.012

+0.222

0.083-0.312

0.412

-0.047

+0.047

Bucket

100

-0.012

+0.258

0.078-0.334

0.434

-0.034

+0.048

Clearance be-
tween piston rod
support pin and
bushing

Boom

100

-0.036

+0.25

0.086-0.321

1.0

Replace the
pin or bush-
ing.

-0.071

+0.05

Arm

110

-0.036

+0.25

0.086-0.321

1.0

-0.071

+0.05

Bucket

-0.036

+0.25

0.086-0.321

1.0

-0.071

+0.05

Clearance be-
tween cylinder
bottom support
pin and bushing

Boom

-0.036

+0.25

0.086-0.321

1.0

-0.071

+0.05

Arm

110

-0.036

+0.25

0.086-0.321

1.0

-0.071

+0.05

Bucket

-0.036

+0.25

0.086-0.321

1.0

-0.071

+0.05

4.6.16.2 Lubrication at every 100 service hours

4-124

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

4.7 Work Equipment

4.7.1 Component dimensions

ZX365-1304500

Fig. 4-122

4-125

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

ZX285-1002022

A - A

B - B

C - C

D - D

E - E

F - F

G - G

I - I

H - H

J - J

K - K

Fig. 4-123

Lubrication

Unit

：

No.

Item

Bushing

material

Lube

interval

Std. size

Std. tolerance

Std. clear-

ance

Clear-

ance

limit

Remedy

轴

孔

Clearance between the pin and
bushing connecting the boom
with swing platform

Copper

500 h

110

–0.036

–0.071

+0.063

0.036

～

0.134

1.0

Replace

Clearance between the pin and
bushing connecting the boom
with arm

Copper

500 h

110

–0.036

–0.071

+0.087

0.036

～

0.158

1.0

Clearance between the pin and
bushing connecting the arm with
rocker

Steel

100 h

–0.036

–0.071

+0.054

0.036

～

0.125

1.0

Clearance between the pin and
bushing connecting the arm with
bucket

Steel

100 h

–0.036

–0.071

+0.054

0.036

～

0.125

1.0

Clearance between the pin and
bushing connecting the linkage
with bucket

Steel

100 h

–0.036

–0.071

+0.2

0.036

～

0.271

1.0

Clearance between the pin and
bushing connecting the linkage
with rocker

Steel

100 h

–0.036

–0.071

+0.054

0.036

～

0.125

1.0

4-126

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

4.7.2 Arm dimensions

ZX285-1002501

A-A

B-B

D-D

C-C

Fig. 4-124

4-127

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

单位：

No.

SY365H-9

SY365BH-9

Standard size

Tolerance

Standard size

Tolerance

100

+0.087

100

+0.087

131

+1.5

131

+1.5

345

-0.5

316

-0.5

-0.036
-0.071

110

-0.071
-0.036

473

602

0.8

354

215

0.5

989

976.6

0.8

2914

2906

3018

3071

473

458

0.8

740

0.3

770

0.3

728

0.5

728

0.5

520

0.5

513.6

—

1,661

—

1570

—

-0.036
-0.071

345

-0.5

346

-0.036
-0.071

-0.03
-0.06

Arm body

345

-0.5

329

-0.5

When bushing

is pressed on

345

—

344

—

Minimum

2,395

—

1,990

—

Maximum

4,145

—

3,275

—

4-128

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

4.7.2.1 Bucket dimensions

W365-1304502

11
12

Fig. 4-125

4-129

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

Unit

：

No.

SY365H-9

SY365BH-9

Standard size

Tolerance

Standard size

Tolerance

520

0.5

567

0.5

1661

—

1714

—

R100

—

R130

—

R125

—

R130

—

1478

—

1451

—

1570

—

1889

—

+0.2

100

+0.2

—

346

486

—

500

—

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