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Hyundai Excavator R210LC-7. Service and repair manual - page 26

8-150

Press

Remove the bushing(4) from idler, using
a special tool.
Only remove bushing if replacement is
necessity.

Pull out the shaft(2) with a press.
Remove seal(3) from idler(1) and bracket
(5).
Remove O-ring(6) from shaft.

Disassembly

Remove plug and drain oil.
Draw out the spring pin(7), using a press.

(2)

8-151

Assembly

Before assembly, clean the parts.
Coat the sliding surfaces of all parts with
oil.
Cool up bushing(4) fully by some dry ice
and press it into shell(1).
Do not press it at the normal temperature,
or not knock in with a hammer even after
the cooling.

(3)

Press

Install shaft(2) to shell(1).

Install seal(3) to shell(1) and bracket(5).

Coat O-ring(6) with grease thinly, and
install it to shaft(2).
Insert shaft(2) into bracket(5) and drive in
the spring pin(7).

8-152

Lay bracket(5) on its side.
Supply engine oil to the specified level,
and tighten plug.

Knock in the spring pin(7) with a
hammer.

Install bracket(5) attached with seal(3).

8-153

DISASSEMBLY AND ASSEMBLY OF RECOIL SPRING

Structure

(1)

Body

Tie bar

Spring

Bracket

Lock nut

Lock plate

Bolt

Spring washer

Rod seal

Back up ring

Dust seal

Rod assembly

Grease valve

7, 8

8-154

Disassembly

Apply pressure on spring(3) with a press.
The spring is under a large installed load.
This is dangerous, so be sure to set
properly.

Spring set load : 13716kg(30238lb)

Remove bolt(7), spring washer(8) and
lock plate(6).
Remove lock nut(5).
Take enough notice so that the press
which pushes down the spring, should
not be slipped out in its operation.
Lighten the press load slowly and
remove bracket(4) and spring(3).

(2)

7, 8
3
6

9 10 11

Remove rod seal(9), back up ring(10)
and dust seal(11).

Remove rod(12) from body(1).
Remove grease valve(13) from rod(12).

8-155

Assembly

Install dust seal(11), back up ring(10) and
rod seal(9) to body(1).
When installing dust seal(11) and rod
seal(9), take full care so as not to
damage the lip.

(3)

Press

9 10 11

Install spring(3) and bracket(4) to body
(1).
Apply pressure to spring(3) with a press
and tighten lock nut(5).
Apply sealant before assembling.
During the operation, pay attention
specially to prevent the press from
slipping out.

Pour grease into body(1), then push in
rod(12) by hand.
After take grease out of grease valve
mounting hole, let air out.
If air letting is not sufficient, it may be
difficult to adjust the tension of crawler.
Fit grease valve(13) to rod(12).

Tightening torque : 10 0.5kg m

(72.3 3.6lb ft)

8-156

7, 8
3
6
5

431

1.5

Press

Lighten the press load and confirm the
set length of spring(3).
After the setting of spring(3), install lock
plate(6), spring washer(8) and bolt(7).

1. STRUCTURE

8-157

GROUP 11 WORK EQUIPMENT

SECTION C

SECTION B

SECTION A

8-158

2. REMOVAL AND INSTALL

BUCKET ASSEMBLY

Removal

Lower the work equipment completely to
ground with back of bucket facing down.

(1)

Install

Carry out installation in the reverse order
to removal.
When aligning the mounting position of
the pin, do not insert your fingers in the
pin hole.
Adjust the bucket clearance.
For detail, see

operation manual.

(2)

Remove nut(3), bolt(4) and draw out the
pin(B).

Remove nut(1), bolt(2) and draw out the
pin(A).

36078AT04

36078AT01

36078AT02

36078AT05

8-159

ARM ASSEMBLY

Removal

Loosen the breather slowly to release the
pressure inside the hydraulic tank.
Escaping fluid under pressure can
penetrated the skin causing serious
injury.
Remove bucket assembly.
For details, see

removal of bucket

assembly.

Disconnect bucket cylinder hose(1).
Fit blind plugs(5) in the piping at the
chassis end securely to prevent oil from
spurting out when the engine is started.
Sling arm cylinder assembly, remove
spring, pin stopper and pull out pin.
Tie the rod with wire to prevent it from
coming out.
For details, see

removal of arm cylinder

assembly.

Place a wooden block under the cylinder
and bring the cylinder down to it.
Remove bolt(2), plate(3) and pull out the
pin(4) then remove the arm assembly.

Weight : 1050kg(2310lb)

When lifting the arm assembly, always lift
the center of gravity.

(1)

2, 3, 4

Crane

Install

Carry out installation in the reverse order
to removal.
When lifting the arm assembly, always lift
the center of gravity.
Bleed the air from the cylinder.

(2)

8-160

BOOM CYLINDER

Removal

Remove arm and bucket assembly.
For details, see

removal of arm and

bucket assembly.

Remove boom cylinder assembly from
boom.
For details, see

removal of arm cylinder

assembly.

(1)

4, 5, 6

Crane

Install

Carry out installation in the reverse order
to removal.
When lifting the arm assembly, always lift
the center of gravity.
Bleed the air from the cylinder.

(2)

Remove bolt(4), plate(5) and pull out the
pin(6) then remove boom assembly.

Weight :1950kg(4300lb)

When lifting the boom assembly always
lift the center of gravity.

Disconnect head lamp wiring.
Disconnect bucket cylinder hose(2) and
arm cylinder hose(1).
When the hose are disconnected, oil
may spurt out.
Sling boom assembly(3).

SECTION 8 DISASSEMBLY AND ASSEMBLY

Group 1 Precaution

8-1

Group 2 Tightening Torque

8-4

Group 3 Pump Device

8-7

Group 4 Main Control Valve

8-30

Group 5 Swing Device

8-43

Group 6 Travel Device

8-68

Group 7 RCV Lever

8-108

Group 8 Turning Joint

8-123

Group 9 Boom, Arm and Bucket Cylinder

8-128

Group 10 Undercarriage

8-145

Group 11 Work Equipment

8-157

1. REMOVAL WORK

Lower the work equipment completely to the ground.
If the coolant contains antifreeze, dispose of it correctly.

After disconnecting hoses or tubes, cover them or fit blind plugs to prevent dirt or dust from entering.

When draining oil, prepare a container of adequate size to catch the oil.

Confirm the match marks showing the installation position, and make match marks in the necessary
places before removal to prevent any mistake when assembling.

To prevent any excessive force from being applied to the wiring, always hold the connectors when
disconnecting the connectors.

Fit wires and hoses with tags to show their installation position to prevent any mistake when
installing.

Check the number and thickness of the shims, and keep in a safe place.

When raising components, be sure to use lifting equipment of ample strength.

When using forcing screws to remove any components, tighten the forcing screws alternately.

Before removing any unit, clean the surrounding area and fit a cover to prevent any dust or dirt from
entering after removal.

When removing hydraulic equipment, first release the remaining pressure inside the hydraulic tank
and the hydraulic piping.

If the part is not under hydraulic pressure, the following corks can be used.

8-1

SECTION 8 DISASSEMBLY AND ASSEMBLY

6.5

8.5

11.5

13.5

18.5

22.5

GROUP 1 PRECAUTIONS

Nominal

number

Dimensions

10)

11)

12)

Taper 1/8

8-2

2. INSTALL WORK

Tighten all bolts and nuts(Sleeve nuts) to the specified torque.

Install the hoses without twisting or interference.

Replace all gaskets, O-rings, cotter pins, and lock plates with new parts.

Bend the cotter pin or lock plate securely.

When coating with adhesive, clean the part and remove all oil and grease, then coat the threaded
portion with 2-3 drops of adhesive.

When coating with gasket sealant, clean the surface and remove all oil and grease, check that there
is no dirt or damage, then coat uniformly with gasket sealant.

Clean all parts, and correct any damage, dents, burrs, or rust.

Coat rotating parts and sliding parts with engine oil.

When press fitting parts, coat the surface with antifriction compound(LM-P).

After installing snap rings, check that the snap ring is fitted securely in the ring groove(Check that
the snap ring moves in the direction of rotation).

When connecting wiring connectors, clean the connector to remove all oil, dirt, or water, then
connect securely.

When using eyebolts, check that there is no deformation or deterioration, and screw them in fully.

When tightening split flanges, tighten uniformly in turn to prevent excessive tightening on one side.

When operating the hydraulic cylinders for the first time after repairing and reassembling the
hydraulic cylinders, pumps, or other hydraulic equipment or piping, always bleed the air from the
hydraulic cylinders as follows:

Start the engine and run at low idling.

Operate the control lever and actuate the hydraulic cylinder 4-5 times, stopping 100mm before the
end of the stroke.

Next, operate the piston rod to the end of its stroke to relieve the circuit. (The air bleed valve is
actuated to bleed the air.)

After completing this operation, raise the engine speed to the normal operating condition.
If the hydraulic cylinder has been replaced, carry out this procedure before assembling the rod to
the work equipment.
Carry out the same operation on machines that have been in storage for a long time after
completion of repairs.

10)

11)

12)

13)

14)

(1)

(2)

(3)

(4)

8-3

3. COMPLETING WORK

If the coolant has been drained, tighten the drain valve, and add water to the specified level. Run
the engine to circulate the water through the system. Then check the water level again.

If the hydraulic equipment has been removed and installed again, add engine oil to the specified
level. Run the engine to circulate the oil through the system. Then check the oil level again.

If the piping or hydraulic equipment, such as hydraulic cylinders, pumps, or motors, have been
removed for repair, always bleed the air from the system after reassembling the parts.

Add the specified amount of grease(Molybdenum disulphied grease) to the work equipment related
parts.

8-4

1. MAJOR COMPONENTS

GROUP 2 TIGHTENING TORQUE

For tightening torque of engine and hydraulic components, see each component disassembly and
assembly.

No.

Descriptions

Bolt size

Torque

kgf m

lbf ft

Engine mounting bolt, nut

Radiator mounting bolt

Coupling mounting socket bolt

Main pump housing mounting bolt

Main pump mounting socket bolt

Main control valve mounting nut

Fuel tank mounting bolt

Hydraulic oil tank mounting bolt

Turning joint mounting bolt, nut

Swing motor mounting bolt

Swing bearing upper part mounting bolt

Swing bearing lower part mounting bolt

Travel motor mounting bolt

Sprocket mounting bolt

Carrier roller mounting bolt, nut

Track roller mounting bolt

Track tension cylinder mounting bolt

Track shoe mounting bolt, nut

Track guard mounting bolt

Counter weight mounting bolt

Cab mounting bolt

Operator's seat mounting bolt

Engine

Under

carriage

Others

Power

train

system

Hydraulic

system

M24

3.0

M12

1.75

M16

2.0

M10

1.5

M20

2.5

M12

1.75

M20

2.5

M20

2.5

M12

1.75

M20

2.5

M20

2.5

M20

2.5

M16

2.0

M16

2.0

M16

2.0

M20

2.5

M16

2.0

M20

1.5

M20

2.5

M36

3.0

M12

1.75

M 8

1.25

7.0

12.8

3.0

1.0

4.8

0.3

4.5

12.2

1.3

5.1

12.3

1.3

57.9

8.7

57.8

6.4

57.8

6.4

23 2.5

26 4.0

23 2.5

54.7

5.0

29.7

4.5

8.0

57.9

8.7

297

12.8

3.0

4.05

0.8

651

92.6

21.7

159

7.2

34.7

2.2

304

32.5

88.2

9.4

325

36.9

325

36.9

88.9

9.4

419

62.9

418

46.3

418

46.3

166

18.1

188

28.9

166

18.1

396

36.2

215

32.5

564

57.9

419

62.9

2148

239

92.6

21.7

29.3

5.8

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