SANY Crawler Hydraulic Excavator SY195C9, SY205C9, SY215C9, SY225C9. Service Manual - page 14

4-127

Structure and Function

Bucket dimension

WX13060403

1

2

3

4

5

6

7

16

17

18

19

A

A

A-A

15

14

9

21

10

12

11

13

15

8

8

20

22

4-128

Structure and Function

Unit: mm

No.

SY195/205/215C-9

SY225C-9

Standard size

Tolerance

Standard size

Tolerance

1

457.5

±0.5

457.5

±0.5

2

22

±0.5

22

±0.5

3

91.8°

—

91.8°

—

4

458

—

458

—

5

1,483

—

1,483

—

6

177

—

177

—

7

45°

—

45°

—

8

φ

80

+0.2

0

φ

80

+0.2

0

9

348.5

+0.2

0

348.5

+0.2

0

10

37

—

37

—

11

107

—

107

—

12

473.5

—

473.5

—

13

φ

23.5

—

φ

23.5

—

14

φ

190

—

φ

190

—

15

φ

136

—

φ

136

—

16

131

—

131

—

17

125

—

125

—

18

R180

—

R180

—

19

R140

—

R140

—

20

57

—

57

—

21

326.5

±0.5

326.5

±0.5

4-129

Structure and Function

1)

Hot water piping

2)

A/C compressor (DENSO.2)

3)

Refrigeration 

piping

4)

Condenser 

(SG447750-A040)

5)

Receiver tank (DENSO.4)

6)

Hot water return piping

7)

A/C unit assembly (SG443180-9320)

8)

Air 

duct

A. Fresh air

B. Recirculated air

C. Warm air/cool air

ZX215-1002137

C

8

7

6

5

4

3

2

1

C

C

C

C

A

B

4.7  Air Conditioning System

4-130

Structure and Function

4.7.1  A/C components layout drawing

1)

Sunlight 

sensor

2)

Control 

panel

3)

Air conditioning unit

4)

Condenser

5)

Compressor

6)

Fresh air sensor

7)

Recirculated air sensor

ZX215-1002138

1

2

3

4

5

6

7

Structure and Function

4.7.2 Control panel

1)

OFF 

switch

2)

Fan speed control switch

3)

Temperature control switch

4)

Air outlet mode switch

5)

Auto mode switch

6)

Air circulation control switch

7)

LCD 

display

8)

A/C 

switch

6

1

2

3

4

5

7

8

CZ205-1203020G

4-132

Structure and Function

4.7.3 Circuit diagram

M

M

CM

1.256

1.25L

M

M

M

25

30

29

28

27

23

15

15

33

15

15

15

15

12

14

13

13

13

15

15

10

8

8

8

8

13

7

9

9

1

1

1

2

2

2

7

4

4

4

3

3

3

02

02

02

02

03

03

02

02

01

06

06

7

5

5

5

6

10

10

10

10

12

12

11

16

16

16

19

19

17

18

21

22

25

22

24

26

25

22

20

31

30

31

32

22

22

32

32

34

34

35

35

35

24

26

M

M

RF

GND

Pt

Vz

REC

FFE

28

G

8

6

BLCM

SP

HL

0.5B

AC

M

M

AM

S

SD

TH

F

TH

I

TH

W

TH

AM

M

V1

M

V2

2G

2RL

M

R

D

D

1

ACC

200W

0.50

2B

2B

80W

1.25B

1.25B

0.85B

2B

40W

BLC

RL

CH

43

2

1

EC

C

RL

CH

R

CD

BA

T

40A

FL

Z

CM

B

60A

15A

20A

1.25R

+B

RL

SF

G

CM

B

RL

CH

RL

CD

RL

CC

SP

CD

M

CD

RL

BM

FU

CD

FU

RM

FL

1

D

2

SW

1.25RL

15

19

16

14

12

13

16

27
4

21

20

22

23

1

22

4

25
9

38

26

10

3

RL

BM

RL

CD

RL

CC

FU

M

1.25R

H

OFF

B

G

1

G

2

ACC
MS
T

ACC

ON

START

SW 

5A

Wiring diagram

4-133

Structure and Function

Wire No. Diameter/Color code

Wire color

Wire No. Diameter/Color code

Wire color

B

Black

0.5VW

Violet+white

Br(R)

Brown

0.5YB

Yellow+black

0.85W

White

0.5WO

White+orange

RL

Red+blue

0.5PB

Pink+black

G

Green

0.5VR

Violet+red

0.5BL

Black+blue

0.5BG

Black+green

0.5R

Red+blue

0.5WY

White+yellow

0.5Y

Yellow

0.5WR

White+red

0.5BR

Black+red

0.5BrW

Brown+white

0.5BrY

Brown+yellow

0.5GO

Green+orange

0.5BY

Black+yellow

0.5Sb

Sky blue

0.5GW

Green+white

0.5OW

Orange+white

0.5LO

Blue+orange

1.25V

Violet

0.5PG

Pink+green

1.25RG

Red+green

0.5RY

Red+yellow

1.25RW

Red+orange

0.5BW

Black+white

0.85GL

Green+Blue

0.5LgR

Light green+red

Code

Name

Code

Name

Code

Name

AC

M

A/C ampli

fi

 er

FU

CD

Condenser fuse

RL

CH

Condenser high speed 

relay

BAT

Battery

FU

M

A/C main fuse

RL

SF

Protective relay

BLC

Speed regulating resistor

G

Alternator

S

SD

Sunlight sensor

CM

B

Battery relay

M

AM

A/M servo motor

SP

CD

Condenser pressure 

switch

D

Diode

M

B

Blower motor

SP

HL

HI/LO pressure switch

D

1

Diode 1

M

CD

Condenser motor

SW

Switcher

D

2

Diode 2

M

RF

Internal/External air servo 

motor

TH

AM

External air thermistor

EC

C

Compressor clutch

M

V1

Air outlet servo motor

TH

F

Anti-frosting thermistor

FL

1

Fuse

M

V2

FRONT outlet servo motor

TH

I

Internal air thermistor

FL

2

Fuse

R

CD

Condenser resistor

TH

W

Water temp. thermistor

FU

BM

Blower fuse

RL

BM

Blower main relay

RL

CC

Compressor relay

RL

CD

Condenser relay

4-134

Structure and Function

4.7.4 Refrigeration principle

4.7.4.1  Refrigeration cycle diagram

4.7.4.2  Heating cycle diagram

ZX215-1002141

Cool air

Lo-pressure portion

Hot air

Hi-pressure portion

Lo temp\Lo press gas

Air in cab

Out side fresh air

Cooling fan

Lo temp\Lo press liquid (Mist)

Hi temp\Hi press liquid

Lo-pres.
side

Hi-pres.
side

Compressor

Blower

Evaporator

Receiver

Expansion valve

Hi-temp hi-pres gas

Condenser

ZX215-1002142

Engine

Water pump

Water valve control

Blower motor

Internal air

Low tempr water

High temp water

Hot air

Radiator

4-135

Structure and Function

4.7.5 Compressor

1)

Stator

2)

Front radial bearing

3)

Thrust 

bearing

4)

Front radial bearing

5)

Rear cylinder head

6)

Safety 

valve

7)

Rear cylinder block

8)

Swash 

plate

9)

Slipper

10) Front cylinder block
11) Piston
12) Front cylinder head
13) Shaft seal
14) Main shaft
15) Hub
16) Rotor

ZX215-1002143

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

4-136

Structure and Function

Operating principle

Compressor type: 10S15C. This compres-
sor has 5 plungers in total with a piston on 
both sides of each plunger. The rotation of 
the swash plate drives the pistons to move 

back and forth and transforms the refrigerant 
sucked from the evaporator from low tempera-
ture and low pressure gas state to high tem-
perature and high pressure state.

ZX215-1002144

Process

1

Process

6

Process

5

Process

3

Process

2

Process

4

HI press.end pipe

HI press.end pipe

HI press.end pipe

HI press.end pipe LO press.end pipe

LO press.end pipe

LO press.end pipe

LO press.end pipe

HI press.end pipe LO press.end pipe

Valve plate

Outlet valve disc

Main shaft and swash plate

HI press.end pipe LO press.end pipe

Intlet valve disc

4-137

Structure and Function

4.7.6 Clutch

●

The electromagnetic clutch is used to
transmit moment of torsion. When the en-
gine is operating, the compressor  may not
be working. The clutch controls the opera-
tion of the compressor only when the air
conditioner is under refrigerating mode.

●

Operating principle

When the A/C switch is turned on, the
clutch coil with an electromagnet gener-
ates a magnetic 

fi

 eld and attracts the metal

piece. The stator and rotor of the clutch are
engaged and drives the main shaft of the
compressor into rotation.

1)

Rotor

2)

Stator 

coil

3)

Snap 

ring

4)

Ball 

bearing

5)

Stator

6)

Center 

piece

ZX215-1002145

1

2

3
4

5

6

4-138

Structure and Function

4.7.7 Expansion valve

1)

Spring

2)

Diaphragm

3)

Probe

4)

Needle 

valve

ZX215-1002147

1

2

3

4

ZX215-1002147

1

2

3

4

Evaporator

Reservoir

Compressor

4.7.8 Condenser

1)

Condenser 

core

2)

Bracket

3)

Bolt with gasket

4)

Refrigerant 

inlet

5)

Refrigerant 

outlet

ZX215-1002146

1

2

3

5

4

Function

●

The condenser converts high-temperature,
high-pressure gas refrigerant (16Kg/cm²,
about 80°C) to high-temperature and high-
pressure liquid refrigerant (16Kg/cm², be-
low 60°C) through radiating.

Operating principle

●

Refrigerant from the receiver tank spurts
out via the orifice, turns into low-temper-
ature, low-pressure liquid (mist) after ex-
panding, and enters the evaporator.

4-139

Structure and Function

4.7.9 Evaporator

1)

Expansion 

valve

2)

Evaporator

ZX215-1002148

1

2

4.7.10 Receiver tank

1)

Inlet

2)

Outlet

3)

Receiver/dehydrator

4)

Desiccant

Function

●

Temporary storage of refrigerant

●

Dehydration of refrigerant

●

Dust removal from refrigerant

●

Measure the volume of refrigerant

ZX215-1002149

1

2

3

4

Operating principle

●

The evaporator is a kind of heat exchanger
that looks like a condenser. Hot air in the
cab is conducted into the evaporator via
the blower motor and undergoes heat ex-
change with the surface of the evaporator.
Heat is absorbed and hot air turns into
cold air, which flows into the cab through
the air ducts.  Evaporator surface absorbs
heat

→

Refrigerant in the evaporator ab-

sorbs heat 

→

 Refrigerant evaporates .

Evaporated refrigerant (gas) is absorbed
by the compressor.

4-140

Structure and Function

4.7.11 Pressure switch

1)

O-ring

2)

Mobile contact point

3)

Hood

4)

Plug 

and 

fi

 xed contact

5)

Spring

6)

Chamber

7)

Diaphragm

Function

●

The pressure switch is installed between
the receiver tank and the expansion
valve (hi-pressure pipe). It is a combina-
tion switch (Hi-Lo pressure combination
switch).

●

When pressure is excessively high, the
compressor stops.

●

When pressure and temperature is very
low, the compressor stops.

Operating features

ZX215-1002150

1

2

3

4

5

6

7

Pressure

DIFF

OFF

ON

DIFF

0.59±0.2 MPa

0.196±0.02 MPa

0.196~0.250 MPa

2.94~3.19 MPa

ON

OFF

1.23±0.1 MPa

1.52±0.08 MPa

HI pressure
operating value

LO pressure
operating value

MID pressure
operating value

Feature

Above 0.02 MPa

4-141

Structure and Function

4.7.12  Fresh air sensor

The fresh air sensor is installed beside the 
condenser or around the fresh air inlet. It mea-
sures the temperature of outside air and it is 
composed of thermistors.

Technical specifi cations

Item

Specifi cation

Service voltage range

4.4~5.6 V

Service temp range

-30~60 °C

Storage temp range

-40~90 °C

Resistance value

1700±85

Ω

B constant

3900±195 K

Allowable operating current

1.6 mA (MAX)

ZX215-1002151

12

10

2

12

8

6

4

2

-10

AT

0

10

20

30

40

Resistance value

/K

¡

4.7.13  

Refrigerant

1. General property

●

High heat absorption and easy liquefaction

●

Non-

fl

 ammable, nonexplosive

●

Stable chemical composition

●

Non-toxic

●

Non-corrosive

●

No hazard to clothing

 

WARNING

●

Obey local material disposal regula-
tions. Never discharge refrigerant di-
rectly into the air.

●

Refrigerant R134 a is a harmless gas
under room temperature. It will change
into highly toxic gas when burning.

●

Refrigerant getting into eyes may cause
blindness. It may cause frostbite if
splashed on your skin.

4-142

Structure and Function

2. Refrigerant cycle

●

After evaporation in the evaporator, refrigerant turns from gas into liquid via the compressor
and the condenser, which 

fi

 nishes a refrigerant cycle.

●

Refrigerant cycle principle (pressure - enthalpy diagram)

lgp

h=u+Apv(kJ/kg)

Gas-liquid mixture

U

Internal energy p

Pressure

V

Special volume A

Joule equivalent

Expansion throttle

Condensing process

Evaporating process

Compressing
process

Throttling point

Gasification completed

Liquefaction starts

Liquefaction completed

Expansion valve

Liquid

Evaporator

Compressor

Condensor

Refrigerant cyclic curve

Compressor

Intake

ė

Discharge

Evaporator

Absorb heat

ė

Emit cold air

Condensor

Via radiating:

Gas refri-

gerant

ė

Liquid refrigerant

Expansion valve

Hi pressure

ė

Lo pressure

Hi temp

ė

Lo temp

Liquid

ė

Mist

Compress HI press. side(outlet): HI temp\HI press.\Gas
Pressure/Temperature:

16Kg/cm²

ˈ

approx. 

80

ć

Condensor (outlet)

˖

HI temp

?

HI pressure

?

Liquid

Compressor LO press. side (inlet): LO temp

?

LO press.

?

Gas

Pressure/Temperature:

2Kg/cm² approx. 8

ć

Pressure/Tempterature

˖

16Kg/cm²

ˈ

Below 

60

ć

Condensor (outlet): LO temp\LO press.\Mist
Pressure/Temperature: 

2Kg/cm²

ˈ

approx. 

0~2

ć