SANY Crawler Hydraulic Excavator SY215CLC (CUMMINS QSB6.7 engine). Shop Manual - page 7

Structure and Function

SY215C

LC

4-12

4.2.5  

 Swing bearing

ZX215-1002008

a

1

2

3

549±50 Nm

549±50 Nm

b

A-A

A

A

1-  Swing bearing inner race (No. of teeth: 91)
2- Ball
3-  Swing bearing outer race

Specifi cations

Reduction ratio: 91/13= 7
Amount of 

fi

 lled grease: 13±1 Kg

a. Inner race soft zone S position                            

b. Outer race soft zone S position

Check item

Criteria

Remedy

Axial clearance of bearing

(when mounted on chassis)

Standard clearance

Clearance limit

Replace

0.5~1.6

3.2

Structure and Function

SY215C

LC

4-13

4.3  

 Undercarriage and Frame

4.3.1  

Track frame and recoil spring

ZX215-1002009

1

2

3

4

5

10

9

7

8

11

X

X

6

Structure and Function

SY215C

LC

4-14

Unit: mm

No.

Check item

Criteria

Remedy

9

Vertical width of 
idler guide

Standard size Tolerance

Repair limit

Build-up 

welding or 

replace

Track frame

107

—

—

Idler support

105

—

—

10

Horizontal width 
of idler guide

Track frame

250

—

—

Idler support

248

—

—

11

Recoil spring

Standard size

Repair limit

Replace

Free length

x Outside 

diameter

Installation 

length

Installation 

load

Free 

length

Installation 

load

572 x 235

466

157.9 kN

{16112 kg}

545

133.9 kN

1- Idler
2- Track frame
3- Carrier roller
4- Sprocket
5- Track roller
6- Track shoe
7- Center guard
8- Front guard

 

●

Dimension and number of track rollers may 
vary depending on the machine model, but 
the basic structure is the same.

 

●

Number of track rollers: 9 each side

Structure and Function

SY215C

LC

4-15

4.3.2  

 Idler

ZX215-1002010

3

5

4

6

9

7

8

1

2

157~255 Nm

Structure and Function

SY215C

LC

4-16

Unit: mm

No.

Check item

Criteria

Remedy

1

Outside diameter of protru-
sion

Standard size

Repair limit

Build-up 

welding or 

replace

560

—

2

Outside diameter of tread

520

508

3

Thickness of tread

30

24

4

Difference of tread

20

26

5

Total width

164

—

6

Width of tread

39.5

—

7

Clearance between shaft 
and bushing

Standard 

size

Tolerance

Standard 

clearance

Clearance 

limit

Replace 

bushing

Shaft

Hole

65

– 0.250
– 0.350

+0.164

– 0.074

0.176 – 0.514

—

8

Interference between idler 
and bushing

Standard 

size

Tolerance

Standard inter-

ference

Interfer-

ence limit

Shaft

Hole

72

+0.108
+0.008

-0.032
-0.062

0.040 – 0.170

—

9

Clearance between bush-
ing and support (Sum of 
clearance at both sides)

Standard clearance

Clearance limit

0.5~1.0

—

Structure and Function

SY215C

LC

4-17

4.3.3  

Carrier roller

ZX215-1002011

1

2

4

3

5

8

7

6

Unit: mm

No.

Check item

Criteria

Remedy

1

Outside diameter of 

fl

 ange

Standard size

Repair limit

Replace

169

—

2

Outside diameter of tread

144

130

3

Width of tread

43

—

4

Thickness of tread

34

27

5

Width of 

fl

 ange

17

—

6

Clearance between shaft 
and bushing

Standard 

size

Tolerance

Standard 

clearance

Clearance 

limit

Shaft

Hole

40

– 0.05
– 0.10

+0.10

0

0.05 – 0.20

—

7

Interference between roller 
and bushing

Standard 

size

Tolerance

Standard 

interference

Interfer-

ence limit

Shaft

Hole

47

+0.16
+0.12

0

-0.08

0.12 – 0.24

—

8

Axial clearance of roller

Standard clearance

Clearance limit

0.44 – 0.76

—

Structure and Function

SY215C

LC

4-18

4.3.4  

 Track roller

ZX215-1002012

549±59 Nm

4

5

7

9

10

3

6

8

2

1

Structure and Function

SY215C

LC

4-19

Unit: mm

No.

Check item

Criteria

Remedy

1

Outside diameter of 

fl

 ange

Standard clearance

Repair limit

Build-up 

welding or 

replace

193

—

2

Outside diameter of tread

160

148

3

Thickness of tread

46.5

40.5

4

Total width

237

—

5

Width of tread

46.5

—

6

Width of 

fl

 ange

32

—

7

Inside width

80

8

Clearance between shaft 
and bushing

Standard size

Tolerance

Standard 

clearance

Clearance 

limit

Replace 

bushing

Shaft

Hole

60

– 0.15
– 0.17

 0

-0.08

0.07 – 0.17

—

9

Interference between 
roller and bushing

Standard size

Tolerance

Standard 

interference

Interfer-

ence limit

Shaft

Hole

67

+0.16
+0.12

 0

-0.08

0.12 – 0.24

—

10

Clearance between bush-
ing and collar (Sum of 
clearance at both sides)

Standard clearance

Clearance limit

Replace

0.5 – 1.0

—

Structure and Function

SY215C

LC

4-20

4.3.5  

 Track shoe

ZX215-1002013

1

20

8

22

21

23

24

16

4

11

10

7

5

6

9

15

2

12

14

13

25

3

19

17

18

Structure and Function

SY215C

LC

4-21

Unit: mm

No.

Check item

Criteria

Remedy

1

Link pitch

Standard size

Repair limit

Reverse or replace

190

193

2

Outside diameter of bushing

Standard size

Repair limit

58.7

53.7

3

Thickness of bushing metal

10.75

5.75

Repair or replace

4

Link height

Standard size

Repair limit

106

98

5

Thickness of link metal (bushing press-

fi

 tting portion)

30.65

22.5

6

Shoe bolt pitch

155.57

Adjust or replace

7

119.57

8

62

9

Link 

Inside width

82.69

10

Overall width

40

11

Tread width

38

12

Protrusion of pin

Regular

2.65

Master

2.65

13

Protrusion of bushing

Regular

3.7

Master

0.0

14

Overall length of pin

Regular

207

Master

209

15

Overall length of bushing

Regular

136.1

Master

128.7

16

Thickness of spacer

—

17

Press-

fi

 tting force

Bushing

88.2 – 245 kN {9 – 25 ton}

—

18

Regular pin

127.4 – 274.4 kN {13 – 28 ton}

19

Master pin

78.4 – 147 kN {8 – 15 ton}

Structure and Function

SY215C

LC

4-22

Unit: mm

No.

Check item

Criteria

Remedy

20

Shoe bolt

a. Regular link

Tightening torque (Nm {kgm})

Retightening angle (°)

Retighten

Triple grouser 

shoe

750±22.5

{62.5±2.3}

120±10

b. Master link

Tightening torque 

(Nm {kgm})

Retightening angle 

(°)

Lower limit torque 

(Nm {kgm})

—

—

—

No. of shoes (each side)

49

—

21

Interference between 
bushing and link

Standard size

Tolerance

Standard interfer-

ence

Adjust or 

replace

Shaft

Hole

58.7

0

-0.05

-0.25
-0.32

0.20 – 0.32

22

Interference between regu-
lar pin and link

36.7

0

-0.04

–0.23
–0.29

0.19 – 0.29

23

Clearance between regular 
pin and bushing

Standard size

Tolerance

Standard clear-

ance

Shaft

Hole

36.7

0

-0.04

0.8
0.5

0.50 – 0.84

24

Interference between mas-
ter pin and link

Standard size

Tolerance

Standard interfer-

ence

Shaft

Hole

36.7

-0.08

-0.11

-0.23
-0.29

0.12 – 0.21

25

Clearance between master 
pin and bushing

Standard size

Tolerance

Standard clear-

ance

Shaft

Hole

36.7

-0.5
-0.7

1

0.5

1 – 1.7

Structure and Function

SY215C

LC

4-23

Unit: mm

No.

Check item

Criteria

Remedy

1

Height

Standard size

Repair limit

Build-up welding 

or replace

26

16

2

Thickness

10

3

Length of base

29.5

4

22

5

Length at tip

 20.5

6

17

7

18

8

Thickness

Standard size

Repair limit

36

26

4.3.6  

Triple grouser shoe

ZX215-1002014

1

2

3

4

5

6

7

8

Model

Item

SY215C9

LC

Shoe width(mm)

800

Link pitch(mm)

190 

Q'ty (One side)

49

Standard track shoe

Structure and Function

SY215C

LC

4-24

4.4  

Hydraulic System, Part 1

4.4.1  

Hydraulic equipment layout drawing

1- Bucket cylinder
2- Arm cylinder
3- Boom cylinder
4- Hydraulic tank
5- Hydraulic oil 

fi

 lter

6- Control valve
7- Hydraulic pump
8- Radiator
9- Accumulator
10-  Left travel motor
11-  Right travel motor
12- Swing motor
13- Lockout lever
14-  Left pilot valve
15-  Center swivel joint
16-  Right pilot valve
17-  Travel pilot valve
18-  Solenoid valve assembly

18A. Pilot lockout solenoid valve
18B. Boom priority solenoid valve
18C. Bucket con

fl

 uence solenoid valve

18D. Swing priority solenoid valve
18E. Hi/Lo travel speed solenoid valve
18F. Secondary boosting solenoid valve

ZX215-1002015

1

2

Structure and Function

SY215C

LC

4-25

3

4

5

6

7

A

A

8

9

10

11

12

13

14

15

16

17

18

18A

18B

18C

18D

18E

18F

ZX225-1102001

Structure and Function

SY215C

LC

4-26

4.4.2  

Hydraulic tank and fi lter

ZX215-1002017

1

2

3

4

5

7

6

A-A

A

A

Structure and Function

SY215C

LC

4-27

1- Hydraulic tank
2- Level gauge
3- Oil 

fi

 ller cap

4- Return oil 

fi

 lter element

5- Bypass valve
6- Breather valve
7- Oil-suction 

fi

 lter element

Specifi cations

Tank capacity: 239 L

Amount of oil inside tank: 172 L

Breather valve

Filter 

fi

 neness: 10

μ

m

Ambient temperature: -30~100°C

Set pressure:

Air inlet side 

→

 0.004MPa (at 1Lmin) 

Air outlet side 

→

 0.017MPa (at 1L/min)