Hyundai Excavator R450LC-7. Service and repair manual - page 33

8-105

20

1

2

88.5

1

5

Lube the metallic face of the half seal with
a thin oil film. 

Fit on the housing the lower ball row,
withstanding the ball race throught the
spacers 1 and 2.
Between the balls, insert the proper
spacers. 

After having placed the bearing spacer fit
the upper ball row. 
Then place the upper inner race.

Lift the flanged hub(17) then lower it inside
the gearbox housing(15). 

(5)

(6)

(7)

(8)

450A8TR36

450A8TR03-1

450A8TR03-2

450A8TR37

8-106

Using a press and a metal stopper, push
the flanged hub(17) against the shoulder
on the gearbox housing(15) until
assembling is complete. 

(9)

Using a press, place and push the 4 bush,
inside their seats on the flanged hub(17).

(10)

View of the 3rd reduction's planet
assembly. 

(11)

Using a press push the 4 planet
assemblies against the shoulder on the
flanged hub(17).

(12)

450A8TR38

450A8TR39

450A8TR40

450A8TR41

8-107

Place the 3rd reduction planet carrier on
the hub(17).

(13)

Using a press push the 3rd reduction
planet carrier against the shoulder on the
flanged hub(17) until complete assembly. 

(14)

Apply LOCTITE type 243 on the 4 socket
head screws(11), and insert them in the
thread holes.

(15)

Tighten the screws by a torque wrench at
a torque of 153kgf

·

m(1107lbf

·

ft), locking

the gearbox acting with the press on a 3rd
reduction's planet. 

(16)

450A8TR42

450A8TR43

450A8TR44

450A8TR45

8-108

Insert the 3rd stage sun gear(14).

(17)

Insert the 2nd reduction assembly(10).

(18)

Insert the 2nd stage sun gear(9).

(19)

Insert the 1st reduction assembly(8).

(20)

450A8TR46

450A8TR47

450A8TR48

450A8TR21

8-109

Insert the 1st stage sun gear(7).

(21)

Fit the O-ring(5) into its grove in the end
cover(4).

(22)

Place the end cover(4) on the gearbox
housing(15). 
Apply LOCTITE type 243 on the 16 socket
head screws(3), and tighten them by a
torque  wrench  at  a  torque of  19.4kgf

·

m

(140lbf

·

ft).

(23)

Place the 2 washer(1) in their groves and
tighten the 2 plugs at a torque of
6.1~8.2kgf

·

m(44.1~59.3lbf

·

ft).

(24)

450A8TR49

450A8TR19

450A8TR50

450A8TR16

8-110

Turn the gearbox around and insert the
brake shaft(19).

(25)

View of the brake discs(21, 22).

(26)

Assemble the brake discs package
according to the following order: Firstly
insert an external toothed sintered bronze
disc(21). Then insert, an internal toothed
steel disc(22). Repete the operation until
reaching the number of 7 bronze and 6
steel discs. 

(27)

Fit the backup rings(23, 26) and the O-
rings(24, 25) inside the two internal groves
of the flanged hub(17, see drawing).

(28)

450A8TR51

450A8TR52

450A8TR53

450A8TR54

8-111

Backup rings

O-rings

Oil pilot

pressure

An O-ring and a backup ring must be fitted
in the grove paying attention that the
backup ring must always be beyond the
O-ring against the oil flow.

※

Insert the brake piston(27) inside the
flanged hub(17), paying attention not to
damage the seals already fitted. 

(29)

Insert the springs(28) into the groves in
the brake piston(27).

(30)

Insert the retainer disc(29).

(31)

450A8TR03-3

450A8TR12

450A8TR55

450A8TR10

8-112

Fixed the equipment to the flanged
hub(17) and screw the threaded screw up
the springs retainer disc(29) is lowered
below the circlip seat(30).

(32)

By means of pliers, place the circlip(30)
into its grove. 

(33)

Fit the O-ring(36) into its grove in the
flanged hub(17).

(34)

Fit the O-ring(20) into the grove of the
motor flange(32).

(35)

450A8TR56

450A8TR57

450A8TR58

450A8TR05

8-113

Place and fix the motor flange(32) to the
flanged hub(17) through 8 screws(35)
tightened by a torque wrench at a torque
of 21.9kgf

·

m(158.4lbf

·

ft).

After having reassembled the gearbox, fit
the travel motor(taking care to include the
O-ring(32), by means of 2 fixing
screws(33), tightened  at  42.3kgf

·

m

(306.0lbf

·

ft).  Fill the gearbox with the

lubricant oil.

(36)

※

450A8TR59

8-114

1.  REMOVAL AND INSTALL

REMOVAL 

Lower the work equipment to the ground
and stop the engine.

Operate the control levers and pedals
several times to release the remaining
pressure in the hydraulic piping.

Loosen the breather slowly to release the
pressure inside the hydraulic tank.
Escaping  fluid  under  pressure  can
penetrate  the  skin  causing  serious
injury.

Loosen the socket bolt(2).

Remove the cover of the console box.

Disconnect pilot line hoses(3).

Remove the pilot valve assembly(1).
When removing the pilot valve assembly,
check  that  all  the  hoses  have been
disconnected.

INSTALL 

Carry out installation in the reverse order
to removal.

Confirm the hydraulic oil level and check
the hydraulic oil leak or not.

GROUP  7  RCV LEVER

1)

2)

(1)

(2)

(3)

(4)

(5)

(6)

(7)

※

(1)

(2)

1

2

3

21078DA06

13031GE18

8-115

2.  DISASSEMBLY AND ASSEMBLY

STRUCTURE

1)

2

2

2

1

1

1

1

1

8

2

1

2

4

3

5

1

6

9

1

1

1

1

2

2

2

2

2

Po

r

t 1,

 

Po

r

t 2,

 

7

2

3

1

Case

2

Plug

3

Plug

4

O-ring

5

Spool

6

Shim

7

Spring

8

Spring seat

9

Stopper

10

Spring

11

Plug

12

Rod seal

13

O-ring

14

Push rod

15

Plate

16

Bushing

17

Joint assembly

18

Swash plate

19

Adjusting nut

20

Lock nut

21

O-ring

22

Handle connector

23

Nut

24

Insert

25

Boot

26

Handle

27

Switch assembly

28

Screw

29

Switch assembly

30

Switch cover

21072SF06

8-117

DISASSEMBLY

Clean pilot valve with kerosene.
Put blind plugs into all ports

Fix pilot valve in a vise with copper(or
lead) sheets.

Remove end of boot(25) from case(1)
and take it out upwards.

(1)

※

(2)

(3)

Loosen lock nut(20) and adjusting nut(19)
with spanners on them respectively, and
take out handle section as one body.

(4)

For valve with switch, remove cord also
through hole of casing.

※

3)

25038RL02(1)

25038RL02(2)

25038RL02(3)

8-118

Turn joint anticlockwise to loosen it,
utilizing jig(Special tool).
When return spring(10) is strong in force,
plate(15), plug(11) and push rod(14) will
come up on loosening joint.
Pay attention to this.

(6)

※

Loosen adjusting nut(19) and plate(18)
with spanners on them respectively, and
remove them.

(5)

RE04 (210-7)

RE05 (210-7)

RE06 (210-7)

RE07 (210-7)

8-119

Loosen hexagon socket head plug(2) with
hexagon socket screw key.

(10)

Remove  reducing valve  subassembly
and return spring(10) out of casing.
Record relative position of reducing valve
subassembly and return springs.

(9)

※

When return spring(10) is weak in force,
plug(11) stays in casing  because of
sliding resistance of O-ring.
Take it out with minus screwdriver.
Take it out, utilizing external periphery
groove of plug and paying attention not to
damage it by partial loading.
During taking out, plug may jump up due
to return spring(10) force.
Pay attention to this.

(8)

※

※

Remove plate(15).

(7)

RE08 (210-7)

RE09 (210-7)

RE10 (210-7)

RE11 (210-7)

8-120

Separate spool(5), spring seat(8, 30),
spring(7, 29) and shim(6) individually.
Until being assembled,  they should  be
handled as one subassembly group.

(12)

※

For disassembling reducing valve section,
stand it vertically with spool(5) bottom
placed on flat workbench.  Push down
spring seat(8, 30) and remove two pieces
of semicircular stopper(9) with tip of small
minus screwdriver.
Pay  attention  not  to  damage  spool
surface.
Record original position of spring seat(8,
30).
Do not push down spring seat more than
6mm.

(11)

※

※

※

Remove O-ring(13) and seal(12) from
plug(11).
Use small minus screwdriver or so on to
remove this seal.

(14)

Take push rod(14) out of plug(11).

(13)

RE14 (210-7)

RE16 (210-7)

RE17 (290-7)

RE15 (210-7)