Hyundai Excavator R450LC-7. Service and repair manual - page 30

8-73-7

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

When disassembling the relief valve,
release the plug(3).
Remove the piston(7), spring seat(9),
spring(8) and plunger(6) with the body(1)
downwards.
Do not release the lock nut(15).

④

※

This completes disassembly.

Remove the roller bearing(444) from the
valve casing(303) by using slide hammer
bearing puller.

③

32038SM17

29078SM04

8-73-8

ASSEMBLY 
Do the reassembly in the reverse procedure
of the disassembly.

Place the casing(301) on the workbench
with the valve casing(303) downward.

(1)

3)

When reassembling the roller bearing,
install the snap ring(432), and
spacer(106) to the drive shaft(101).
Insert the collar and cone of the roller
bearing(443).   Install the spacer(106) and
snap ring(432).   Install snap ring(433) to
the output shaft (101) by heating the cone
of the roller bearing(444).

(2)

Insert the drive shaft(101) into the casing
(301) with the end of output shaft upward
and tap the outer race of roller bearing
with the hammer.

(3)

32038SM20

32038SM21

32038SM22

32038SM23

8-73-9

Install the snap ring(437) to the casing
(301).

(6)

Reassemble the front cover(304) to the
casing(301).
Apply grease to the rib of oil seal to avoid
damage to the rib.

(5)

※

Tack O-ring(471) to the casing(301).

(4)

Insert the shoe plate(124) with the casing
(301) position horizontally.

(7)

32038SM25

32038SM26

32038SM27

32038SM28

8-73-10

Reassemble the piston assembly(121,
122) to the cylinder(111).

(10)

Install the piston sub-assembly(121, 122)
to the retainer(123).

(9)

Insert the push rod(116) into the cylinder
(111).   Place the spherical bushing(113)
assembled with spacer(117) onto the
cylinder.
Insert two push rods in each hole.

(8)

※

Place the casing(301) under the front
cover(304) and reassemble 3 sheets of
separate plate(743) and then 2 sheets of
friction plate(742) to the casing(301).

(11)

32038SM29

32038SM30

32038SM31

32038SM32

8-73-11

Reassemble brake spring(712) to the
brake piston(702).

(14)

Reassemble brake piston(702) to the
casing(301).

(13)

Insert O-ring(706, 707) inside the casing
(301).

(12)

When assembling the roller bearing(444),
insert the roller bearing(444) into valve
casing(303) by hammering.

(15)

32038SM33

32038SM34

32038SM35

32038SM36

8-73-12

Insert plunger(351) and spring(355) in the
valve casing and install O-ring(488).
Tighten plug(469) to the valve casing.

(18)

Connect the valve casing(303) with the
casing(301) and tighten the hexagon
socket bolt(401).

(17)

Reassemble valve plate(131) to the valve
casing(303) and reassemble O-ring(472).

(16)

Insert O-rings(051-1) to the relief valve
(051) and reassemble them to valve
casing(303).

(19)

32038SM37

32038SM38

32038SM39

32038SM42

8-73-13

Connect the valve casing(303) with the
casing(301).

This completes assembly.

(21)

Tighten the plug(468) to valve casing(303)
with O-ring(487) and tighten the plug(464)
to casing(301) with O-ring(485).

(20)

32038SM43

8-73-14

3. REMOVAL AND INSTALL OF REDUCTION GEAR

REMOVAL

Remove the swing motor assembly.
For details, see removal  of  swing  motor
assembly.

Sling reduction gear assembly(1) and
remove mounting bolts(2).

Remove the reduction gear assembly. 

·

Reduction gear device weight : 180kg 

(396lb)

I

I

NSTALL

Carry out installation in the reverse order
to removal.

·

Tightening torque : 49.2~66.6kgf

·

m

(356~481lbf

·

ft)

2

1

(1)

(2)

(3)

1)

2)

(1)

13031GE18

21078DA05

8-73-15

4.  REDUCTION GEAR

STRUCTURE

1)

1

Casing

2

Drive shaft

3

Spacer

5

Roller bearing

6

Oil seal

7

Roller bearing

8

Thrust plate

9

Carrier 2

10

Stop ring

11

Ring gear

12

Knock pin

13

Pinion gear

14

Thrust washer

15

Planet gear 2

16

Pin 2

17

Spring pin

18

Sun gear 2

19

Carrier 1

20

Side plate 1

21

Pin 1

22

Needle cage

23

Bushing

24

Planet gear 1

25

Lock washer

26

Side plate 3

27

Sun gear 1

28

Stop ring

29

Plug

30

Plug

31

Socket bolt

32

Gage pipe 39

33

Gage bar side plate2

34

Cover plate

35

Hex bolt

36

Lock plate

37

Hex bolt

38

Stop ring

39

Side plate 2

40

Air breather assy

25

13

37 36

20

30

1

5

35

34

3

2

23

12

14

8

17

21

16

15

10

6

29

7

18

11

9

39

27

38

22

24

26

19

31 28

32

33

50072SM03

8-73-16

DISASSEMBLY

Spread off the 4 corners of lock washer
(25) with a tool.
Do not reuse lock washer(25).
Loosen the hexagon bolts(37) and then
remove lock washer(25) and lock plate
(36) from the pinion gear(13).
Remove pinion gear(13) and spacer(3)
from the drive shaft(2).
Remove cover plate(34) from the casing
(1) by loosening the hexagon socket bolts
(35).

Remove gauge bar(33) and gauge pipe
(32) from the swing motor casing.
Pour the gear oil out of reduction gear into
the clean bowl to check out the friction
decrease.

Loosen the socket bolts(31) to separate
swing motor from reduction gear.

33

32

25 37

36

13

3

35

34

1

2

31

(1)

※

2)

(2)

※

(3)

Tighten 3 M16 eye bolts to the ring gear
(11) and then lift the ring gear(11) out of
the casing(1).

11

1

(4)

21078SR001

21078SR002

21078SR003

21078SR004

8-73-17

Remove stop ring(28) and then sun gear1
(27).

27

28

19

(5)

Tighten two M10 eye bolts to carrier1(19)
and lift up and remove carrier1(19) as
subassembly.

19

19

38

39

22

24
20
17

21

26

(6)

Disassembling carrier1(19) assembly.

Remove stop ring(38).
Remove side plate2(39), planet gear1
(24), needle cage(22), side plate1(20)
and side plate3(26) from the carrier.
Using M8 solid drill, crush spring pin(17)
so that the pin1(21) can be removed by
hammering.
Remove side plate3(26) from carrier1(19).
Do not reuse spring pin(17).
Do not remove pin1(21), carrier1(19) and
spring pin(17) but in case of replace-
ment.
Put matching marks on the planet gear1
(24) and the pin1(21) for easy
reassembly.

(7)

①
②

③

④
※
※

※

21078SR005

21078SR006

21078SR007

8-73-18

Remove sun gear2(18) and thrust gear
(14).

18

14

(8)

Remove carrier2(9) assembly from casing
(1).

9

1

(9)

Remove thrust plate3(8) and stop ring
(10) from the drive shaft(2).

10

2

8

9

17

16
15
23

Disassembling carrier2(9) assembly

Using M8 solid drill, crush spring pin(17)
so that the pin2(16) can be removed.
Do not reuse spring pin(17).
Remove pin2(16), planet gear2(15) and
bush2(23) from the carrier2(9).
Put matching marks on the planet gear2
(15) and the pin2(16) for easy reassembly.
Do not disassemble pin2(16), carrier2(9)
and spring pin(17) but in case of
replacement.

(10)

(11)

①

※
②

※

※

21078SR008

21078SR009

21078SR010

21078SR011

8-73-19

Remove drive shaft(2) with roller
bearing(7) and oil seal(6) assembled.
Remove knock pin(12) from the casing(1).

1

6

7

2

12

(12)

Remove roller bearing(7) and oil seal(6)
from the drive shaft(2).
Do not reuse oil seal(6) once removed.

2

6

7

(13)

※

Using the bearing disassembly tool,
remove roller bearing(5).

5

1

(14)

Remove plugs(29, 30) from the casing(1).

1

29
30

30

(15)

21078SR012

21078SR013

21078SR014

21078SR015

8-73-20

ASSEMBLY 

Assemble roller bearing(5) inside the
casing(1).

Assemble the drive shaft(2) into the
casing(1) and then install oil seal(6) and
roller bearing(7).

1

2

6

7

5

1

(1)

3)

(2)

Install stop ring(10) and thrust plate 3(8)
on top of drive shaft(2).

10

2

8

(3)

9

17

16
15
23

Assembling carrier2(9) assembly.

Install thrust washer(14) inside the
carrier2 (9).
Install bush2(23) inside the planet gear2
(15) and then assemble them to the
carrier2(9).
Assemble the pin2(16) to the carrier2(9)
and then press the spring pin(17) by
hammering.
Punch 2 points of the spring pin(17) lip.
Take care not to mistake the matching
marks of each part.

(4)

①

②

③

④
※

21078SR016

21078SR017

21078SR018

21078SR019

8-73-21

Assemble carrier2(9) assembly correctly
to the drive shaft(2).

9

1

(5)

Assemble sun gear2(18) and thrust
washer(14) to the center of the carrier2(9)
assembly.

18

14

9

(6)

19

38

39

22

24
20
17

21

26

Assembling carrier1(19) assembly.

Assemble the pin1(21) to the carrier1(19)
and then press the spring pin(17) by
hammering.
Punch 2 points of the spring pin's(17) lip.
Install side plate3(26) onto the center of
carrier1(19).
Install needle cage(22) into the planet
gear1(24).
Assemble side plate(20), planet gear1
(24), side plate2(39) and then stop ring
(38) to the pin1(21).
Take care not to mistake the matching
marks of each part.

(7)

①

②
③

④

⑤

※

21078SR020

21078SR021

21078SR022

8-73-22

Install sun gear1(27) onto the side plate3
(26).

27

19

26

(8)

Assemble carrier1(19) assembly onto the
carrier2(9) assembly.

19

(9)

Apply loctite to the tapped holes of casing
(1).

Tighten 3 M16 eye bolts to the ring
gear(11) and lift up and then assemble it
onto the casing(1).
Don't fail to coincide the knock pin(12)
holes.

11

1

(10)

(11)

※

Hammer 4 knock pins(12) around the ring
gear(11).

Assemble stop ring(28) to the drive shaft
of the swing motor.

11

1

12

28

(12)

(13)

21078SR023

21078SR024

21078SR025

21078SR026