Hyundai Excavator R210LC-7. Service and repair manual - page 25

7 - 26

The spherical sliding section that

contacts the retainer plate(107)
is nonuniformly worn out.

The sliding surface has the traces

of seizure or nonuniformly wear.

Both edges are nonuniformly

worn out.

The required torque cannot be

achieved.

The traces of seizure are present.

The seat surface is damaged.

The outer surface is damaged.

The seat surface is damaged.

The sliding section that contacts

the spool(137) is damaged.

The clearance against the

spool(137) is too large.

The outer surface is damaged.

The outer surface is nonuniformly

worn out.

Dents are present.

Flaking develops.

Nonuniform wear is observed.

The outer surface is damaged.

The seat surface is damaged.

The seat surface is damaged.

The outer surface is damaged.

The seat surface is damaged.

The seat surface is damaged.

Thrust ball

Timing plate

Friction plate

Mating plate

Valve seat

Valve

Body kit

Body

Spool

Roller bearing
Ball bearing

Valve

Stopper

Valve

Valve seat

-

Braking torque
49.3kgf m or less

-

-

Linear clearance : 
20 

-

-

-

-

-

-

Braking torque
49.3kgf m or more

-

-

Linear clearance : 
7 to 15 

-

-

-

-

-

108

109

115

116

118

119

136

137

149
150

163

164

142

172

Situation

Standard dimension

Part name

Maximum allowable

value(Criteria)

Item 

No.

7 - 27

5. RCV LEVER

Criteria

Remark

The valve is to be replaced when the leakage

becomes more than 1000cc/m at neutral handle

position, or more than 2000cc/m during operation.

This is to be replaced when the sliding surface has

worn more than 10 m, compared with the non-

sliding surface.

This is to be replaced when the top end has worn

more than 1mm.

The pin, shaft, and joint of the operating section are

to be replaced when their plays become more than

2mm due to wears or so on.

When abnormal noises, hunting, primary pressure

drop, etc.  are generated during operation, and

these cannot be remedied, referring to section 6.

Troubleshooting, replace the related parts.

Leakage

Spool

Push rod

Play at operating

section

Operation stability

Conditions :

Primary pressure : 30kgf/cm

2

Oil viscosity          : 23cSt

The leakage at the left condition is

estimated to be nearly equal to the

above leakage.

When a play is due to looseness of a

tightened section, adjust it.

Maintenance

check item

Notes 1. It is desirable  to replace seal materials, such as O-rings, every disassembling.   However,

they may be reused, after being confirmed to be free of damage.

2. When loosening the hexagon socket head cap screw(125), replace the seal washers(121)

without fail.

7

1mm

7 - 28

6. RCV PEDAL

Criteria

Remark

The valve is to be replaced when the leakage effect

to the system.   For example, the primary pressure

drop.

This is to be replaced when the sliding surface has

worn more than 10 m, compared with the non-

sliding surface.

This is to be replaced when the top end has worn

more than 1mm.

The pin, shaft, and joint of the operating section are

to be replaced when their plays become more than

2mm due to wears or so on.

When abnormal noises, hunting, primary pressure

drop, etc.  are generated during operation, and

these cannot be remedied, referring to section 6.

Troubleshooting, replace the related parts.

Leakage

Spool

Push rod

Play at operating

section

Operation stability

Conditions :

Primary pressure : 30kgf/cm

2

Oil viscosity          : 23cSt

The leakage at the left condition is

estimated to be nearly equal to the

above leakage.

When a play is due to looseness of a

tightened section, adjust it.

Maintenance

check item

Notes 1. It is desirable  to replace seal materials, such as O-rings, every disassembling.   However,

they may be reused, after being confirmed to be free of damage.

7

1mm

7 - 29

7. TURNING JOINT

Maintenance standards

Remedy

Plating worn or peeled due to seizure or contamination.

Worn abnormality or damaged more than 0.1mm
(0.0039in) in depth due to seizure contamination.

Damaged more than 0.1mm(0.0039in) in depth.

Worn more than 0.5mm(0.02in) or abnormality.

Worn less than 0.5mm(0.02in).

Damage due to seizure or contamination remediable
within wear limit (0.5mm)(0.02in).

Worn more than 0.5mm(0.02in) or abnormality.

Worn less than 0.5mm(0.02in).

Damage due to seizure or contamination remediable
within wear limit (0.5mm)(0.02in).

Extruded excessively from seal groove square ring.

Slipper ring 1.5mm(0.059in) narrower than seal
groove, or narrower than back ring.

Worn more than 0.5mm(0.02in) ~ 1.5mm(MAX.)

(0.059in)

Sliding surface with
sealing sections.

Sliding surface
between body and
stem other than
sealing section.

Sliding surface
with thrust plate.

Sliding surface
with thrust plate.

-

-

-

Replace

Replace

Smooth with oilstone.

Replace

Smooth

Smooth

Replace

Smooth

Replace

Replace

Replace

Replace

Part name

Body,

Stem

Cover

Seal set

Square ring

Extrusion

1.5mm (max.)
(0.059in)

7 - 30

8. CYLINDER

Remedy

Piston rod

Cylinder tube

Gland

Replace

Replace

Replace

Recondition or replace

Replace or replate

Replace or replate

Recondition, replate or replace

Recondition, replate or replace

Replace

Replace

Replace

Replace

Replace if oil leak is seen

Replace

Replace if flaw is deeper 
than coating

Part name

Inspection item

Presence of crack

Presence of crack

Presence of crack

Presence of crack

Plating is not worn off to  base
metal.

Rust is not present on plating.

Scratches are not present.

Wear of O.D.

Wear of I.D.

Presence of crack

Presence of crack

Presence of crack

Presence of faults

Wear on inner surface

Flaw on inner surface

Inspecting section

Neck of rod pin

Weld on rod hub

Stepped part to which piston
is attached.

Threads

Plated surface

Rod

Bushing at mounting part

Weld on bottom

Weld on head

Weld on hub

Tube interior

Bushing at mounting part

Bushing

7 - 31

1. TRACK

TRACK ROLLER

GROUP  3  TRACK AND WORK EQUIPMENT

1)

No.

Check item

Criteria

Remedy

Standard size

200

160

48

21.5

Repair limit

148

54

15.5

Outside diameter of flange

Outside diameter of tread

Width of tread

Width of flange

Clearance between shaft
and bushing

Side clearance of roller
(Both side)

1

2

3

4

5

6

Standard size & tolerance

Shaft

Hole

-0.29
-0.33

+0.046

0

70

70.1

Standard

clearance

Clearance

limit

0.39

to    0.476

2.0

Standard clearance

0.2 to 1.2

Clearance limit

2.0

Rebuild or

replace

Replace

bushing

Replace

Unit : mm

6

3

4

5

2

1

21037MS01

7 - 32

CARRIER ROLLER

2)

Unit : mm

4 3

2

5

1

No.

Check item

Criteria

Remedy

Standard size

169

144

44

17

Repair limit

134

49

Outside diameter of flange

Outside diameter of tread

Width of tread

Width of flange

Clearance between shaft
and bushing

1

2

3

4

5

Standard size

Tolerance

Shaft

Hole

+0.085
+0.066

+0.37
+0.33

55

Standard

clearance

Clearance

limit

0.245

to    0.304

2.0

Rebuild or

replace

Replace

bushing

21037MS02

7 - 33

IDLER

3)

Unit : mm

2

6

7

1

8

3

4

5

No.

Check item

Criteria

Remedy

Standard size

560

520

84

160

38

Repair limit

514

44

Outside diameter of protrusion

Outside diameter of tread

Width of protrusion

Total width

Width of tread

Clearance between shaft
and bushing

Clearance between shaft
and support

Side clearance of idler
(Both side)

1

2

3

4

5

6

7

8

Rebuild or

replace

Replace

bushing

Replace

bushing

Replace

Standard size & tolerance

Shaft

Hole

0
-0.03

+0.05

0

75

75.35

0
-0.03

+0.07
+0.03

75

75

Standard

clearance

Clearance

limit

0.35 to 0.43

0.03 to 0.1

2.0

1.2

Standard clearance

0.4 to 1.2

Clearance limit

2.0

21037MS03

7 - 34

TRACK

4)

No.

Check item

Criteria

Remedy

Standard size

190

59

26

105

Repair limit

195

53.4

19

101

Link pitch

Outside diameter of bushing

Height of grouser

Height of link

Tightening torque

1

2

3

4

5

Turn or
replace

Rebuild or

replace

Retighten

Unit : mm

Initial tightening torque : 78 8kgf m

2

1

3

4

5

21037MS04

7 - 35

TRACK FRAME AND RECOIL SPRING

5)

Unit : mm

No.

Check item

Criteria

Remedy

Vertical width of idler guide

Horizontal width of idler guide

Recoil spring

1

2

3

Track frame

Idler support

Track frame

Idler support

+0.5

-0.5

Rebuild or

replace

Replace 

Standard size

Tolerance

Repair limit

+2

0

- 0.5
- 1.0

+2

0

113

110

272

270

117

106

277

267

Standard size

Repair limit

Free

length

235 515

Installation 

length

431

Installation 

load

13716kg

Free

length

Installation 

load

10973kg

2

1

3

21037MS05

7 - 36

2. WORK EQUIPMENT

Unit : mm

Mark

Pin

Remedy

&

Remark

Normal

value

Recomm.

service

limit

Limit 

of use

Recomm.

service

limit

Limit 

of use

Measuring point

(Pin and Bushing)

Bushing

A

B

C

D

E

F

G

H

I

J

K

Boom Rear

Boom Cylinder Head

Boom Cylinder Rod

Arm Cylinder Head

Boom Front

Arm Cylinder Rod

Bucket Cylinder Head

Arm Link

Bucket and Arm Link

Bucket Cylinder Rod

Bucket Link

90

80

80

80

90

80

80

70

80

80

80

89

79

79

79

89

79

79

69

79

79

79

88.5

78.5

78.5

78.5

88.5

78.5

78.5

68.5

78.5

78.5

78.5

90.5

80.5

80.5

80.5

90.5

80.5

80.5

70.5

80.5

80.5

80.5

91

81

81

81

91

81

81

71

81

81

81

Replace

C

D

E

F

G

H

I

J

K

A

B

21077MS20

8-145

1.  TRACK LINK

REMOVAL

Move track link until master pin is over
front idler  in the position  put wooden
block as shown.

Loosen tension of the track link.
If track tension is not relieved when the
grease  valve is loosened,  move the
machine backwards and forwards.

Push out master pin by using a suitable
tool.

GROUP  10  UNDERCARRIAGE

90 ~ 110

1)

(1)

(2)

(3)

Master pin

Block

1

INSTALL 

Carry out installation in the reverse order
to removal.
Adjust the tension of the track link.

2)

(1)

Move the machine slowly in reverse, and
lay out track link assembly (1).
Jack up the machine and put wooden
block under the machine.
Don't get close to the sprocket side as the
track shoe plate may fall down on your
feet.

(4)

8-146

2.  CARRIER ROLLER

REMOVAL

Loosen tension of the track link.

(1)

1)

Frame

Jack

1

2

Carrier roller

Carrier

roller

Grease
valve

INSTALL 

Carry out installation in the reverse order
to removal.

2)

(1)

Loosen the lock nut (1).

Open bracket(2) with a screwdriver, push
out from inside, and remove carrier roller
assembly.

Weight : 21kg(46lb)

(3)

(4)

Jack up the track link height enough to
permit carrier roller removal.

(2)

8-147

3.  TRACK ROLLER

REMOVAL

Loosen tension of the track link.

(1)

1)

Frame

Grease
valve

90-110

1

2

INSTALL 

Carry out installation in the reverse order
to removal.

2)

(1)

Remove the mounting bolt(1) and draw
out the track roller(2).

Weight : 38.3kg(84.4lb)

(3)

Using the work equipment, push up track
frame on side which is to be removed.
After jack up the machine, set a block
under the unit.

(2)

8-148

4.  IDLER AND RECOIL SPRING

REMOVAL

Remove the track link.
For detail, see 

removal of track link

.

(1)

1)

2, 3

1

INSTALL 

Carry out installation in the reverse order
to removal.
Make sure that the boss on the end face
of the recoil cylinder rod is in the hole of
the track frame.

2)

(1)

Remove the bolts(2), washers(3) and
separate ilder from recoil spring.

(3)

Sling the recoil spring(1) and pull out idler
and recoil spring assembly from track
frame, using a pry.

Weight : 270kg(595lb)

(2)

8-149

DISASSEMBLY AND ASSEMBLY OF IDLER 

Structure

(1)

3)

1

Shell

2

Shaft

3

Seal assembly

4

Bushing

5

Bracket

6

O-ring

7

Spring pin

8

Plug

1

4

3

8

7

5

4

3

7

6

2

5

6