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Hyundai Excavator R450LC-7. Service and repair manual - page 29

8-64

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

(397lb)

NSTALL

Carry out installation in the reverse order
to removal.

Mounting bolt : 49.2~66.6kgf

(356~481lbf

ft)

(1)

(2)

(3)

(1)

45078SR01

13031GE18

8-65

4. REDUCTION GEAR

STRUCTURE

45070SR01

Pinion shaft

Collar

Plate

Snap ring

Roller bearing

Gear casing

Collar

Snap ring

Oil seal

Roller bearing

Parallel pin

Ring gear

Spur gear4

Thrust plate

Sun gear

Holder assy 1

Bolt

Lock washer

Holder assy 2

Shaft 2

Spur gear 5

Thrust plate 2

Spring pin

Holder 2

Plug

Remove shaft 2(20) from holder 2(19),
spur gear 5(21) with hands.

Removal of planetary gear 4 and 2nd
holder assembly
Remove spur gear 4(13) and holder
assembly 2(19) itself.

DISASSEMBLY

Removal of sun gear and 1st holder
assembly
Remove sun gear(15) and holder
assembly1(16) itself.
Shaft 1(16) is pressed into holder(13) and
tighten by press. Therefore, it is
impossible to disassemble any more.
Please replace assembly(16) if they have
defect.

8-66

(1)

※

(

Disassembly of 2nd holder assembly

Insert spring pin(23) into shaft 2(20) by
hammering.
Do not reuse spring pin after removal.

①

※

(

②

SRG70 (450-3)

SRG68 (450-3)

SRG50 (450-3)

SRG51 (450-3)

Remove roller bearing(10) from gear
casing(6).

Press end face of pinion shaft(1) with
hydraulic press to gain space(approx.
300mm) needed for removing pinion shaft
at flange part of gear casing, and remove
pinion shaft(1), collar(2), plate(3), roller
bearing(5) as assembly.
Do not reuse oil seal(9) after removal.

8-67

Removal of ring gear

Remove ring gear(12) from casing(6).
Fluid packing is applied on contacting
face of ring gear and gear casing.
Therefore, remove ring gear through tap
hole of gear casing with (-) driver.

①
※

(

Removal of pinion shaft assembly

Remove snap ring(4) through hole of
gear casing with (-)driver.

①

(5)

②

③

SRG52 (450-3)

SRG53 (450-3)

SRG54 (450-3)

SRG55 (450-3)

Disassembly of pinion shaft assembly

Remove snap ring(8) from pinion shaft(1)
with scriber and then remove collar(7).
Be cautions not to damage on sliding
face of oil seal lip of pinion shaft.

Remove oil seal(9) from gear casing(6).

8-68

①

※

Remove roller bearing(5), plate(3) and
collar(2) by pressing output pinion shaft
and end face of the other side.
Replace pinion shaft assy if they have
defeat.

This completes disassembly.

④

(

②

※

SRG56 (450-3)

450A8SR11-1

450A8SR11-2

Lubricate on outer face of roller
bearing(5) with grease.
Capacity : 400cc

Assemble collar(7) and snap ring(8).
Be cautions of assembling direction.

Heat roller bearing(5) up to 50

。

C plus

surrounding temperature and assemble it
to pinion shaft(1).
Heat roller bearing up more than 100

。

SSEMBLY

Assembly of pinion shaft assembly

Insert collar(2) into pinion shaft(1) and
assemble plate(3).
Be cautious of assembling direction.

8-69

(1)

①

②

※

④

③
※

450A8SR12-1

450A8SR12-2

450A8SR12-3

SRG59 (450-3)

Assemble snap ring(4).
When assembling, loosen cutting place
of snap ring about 30mm from connec-
tions of gear casing for easy disassem-
bly.

Put pinion shaft of gear casing(6)
upward.
Assemble pinion shaft assembly to gear
casing by tightening eye bolt into tap
hole(M16) of output side of pinion
shaft(1).

Assembly of pinion shaft assembly

Be careful lest oil seal lip damage by
spline of pinion shaft(1).
Assemble pinion shaft assembly by using
seal guide.

Installation of oil seal
Remove oil from assembled face of oil
seal of gear casing(6) and oil seal(9).
Apply fluid packing(three bond of white
color) on outer face of oil seal and
assemble at pressing jig of gear casing.
After inserting with press, lubricate on oil
seal lip with grease.

8-70

(2)

①

②

(

③
※

SRG60 (450-3)

SRG61 (450-3)

SRG62 (450-3)

Assembly of holder assembly

Insert shaft 2(20) after putting plate(22)
and holder(24).
Lubricate gear oil to inside of gear and
outside of shaft.

Assemble ring gear(12).

Assembly of ring gear

Remove oil from mating faces between
gear casing(6) and ring gear(12), and
from pin(11). Assemble collar to gear
casing and apply fluid packing(three
bond of grey color).

Assembly of roller bearing
Put gear casing under pinion shaft. Heat
inner race of roller bearing(10) up to 50

。

plus surrounding temperature and
assemble to center of pinion shaft.
Assemble roller bearing by putting
between gear casing and pinion shaft.

8-71

①

②

(

①

※

(

(4)

SRG63 (450-3)

SRG64 (450-3)

SRG65 (450-3)

SRG66 (450-3)

Assembly of sun gear and 1st holder
assembly

Insert holder assembly being engaged
with internal teeth of ring gear(12).
Rotate holder assembly lightly so that
spur gear 4(13) is engaged with teeth of
holder 1(16).

Insert spur gear 4(13) thrust plate to gear
5(21).

Assembly of 2nd holder assembly and
planetary gear 4

Insert holder assembly being engaged
with internal teeth of ring gear(12).
Rotate holder assembly lightly so that
splines of pinion shaft(1) are engaged.

Insert spring pin(23) by hammering.
Insert as the clearance between spring
pins toward gear(21).

8-72

②
※

①

②

(

①

(8)

SRG67 (450-3)

SRG68 (450-3)

SRG69 (450-3)

SRG70 (450-3)

Check rotation of sun gear by turning 1st
holder assembly with hands.

This completes assembly.

Insert sun gear(15) to planetary gear
2(15).

8-73

(9)

②

SRG71 (450-3)

SRG72 (450-3)

8-73-1

1. REMOVAL AND INSTALL OF MOTOR

REMOVAL

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

Loosen the breather slowly to release the
pressure inside the hydraulic tank.
Escaping fluid under pressure can
penetrate the skin causing serious in
injury.
When pipes and hoses are disconnected,
the oil inside the piping will flow out, so
catch it in oil pan.

Disconnect pipe assy(4, 5, 6, 7).

Disconnect pilot line hoses(2, 3, 8, 9, 10,
11, 12, 13, 14, 15, 16, 17).

Sling the swing motor assembly(1)and
remove the swing motor mounting
bolts(18).

Motor device weight : 63kg(139lb)

Tightening torque : 58.4kgf

(422.4lbf

ft)

Remove the swing motor assembly.
When removing the swing motor
assembly, check that all the piping have
been disconnected.

NSTALL

Carry out installation in the reverse order
to removal.

Bleed the air from the swing motor.

Remove the air vent plug.
Pour in hydraulic oil until it over flows from
the port.
Tighten plug lightly.
Start the engine, run at low idling, and
check oil come out from plug.
Tighten plug fully.

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

GROUP 5 SWING DEVICE(#0409~)

4
5

(1)

(2)

※

(3)

(4)

(5)

(6)

※

(1)

(2)

①
②

③
④

⑤

(3)

45078SM01

45078SM02

13031GE18

8-73-2

2. SWING MOTOR

STRUCTURE

031 Brake valve
051 Relief valve
052 Reactionless valve assy
101 Drive shaft
106 Spacer
111 Cylinder block
113 Spherical busing
114 Cylinder spring
116 Push rod
117 Spacer(F)
118 Spacer(R)
121 Piston
122 Shoe plate
123 Retainer
124 Shoe
131 Valve plate
301 Casing(F)

303 Valve casing(K)
304 Front cover
351 Plunger(K)
355 Spring
401 Socket bolt
432 Snap ring
433 Snap ring
437 Snap ring
438 Snap ring
443 Roller bearing
444 Roller bearing
451 Spring pin
464 VP Plug
468 VP Plug
469 RO Plug
471 O-ring
472 O-ring

485 O-ring
487 O-ring
488 O-ring
491 Oil seal
501 Adapter
502 Socket bolt
503

O-ring

702 Brake piston
706 O-ring
707 O-ring
712 Brake spring
742 Friction plate
744 Dust plug
745 Dust plug
746 Dust plug
993 PT Plug
994 PT Plug

702

117 121 118 114 706 707

712 472

432

106

443

471

304

101

491

437

124

301

122 123 113 116 111

742 031 743 131

451

433

745

746

487

468

303

444

106

438

994

SECTION A - A

485

464

401

051

993

351 052 501

355

744

503

502

488

469

50072SM02

8-73-3

DISASSEMBLY

Lift the motor out. Clean the motor in
kerosene and dry with compressed air.
To avoid dust inside the motor, mask all
the ports of the motor with tapes.

Remove the valve(052).

(1)

※

(4)

Fix the drive shaft(101) on the workbench
with the end of output shaft down. Put
matching marks on casing (301) and
valve casing(303) for easy reassembly.

(3)

Loosen the drain plug to discharge oil in
the casing(301).

(2)

)

32038SM01

32038SM02

32038SM03

32038SM04

8-73-4

Remove the relief valve(051) from valve
casing(303).

(5)

Remove the brake spring(712) from brake
piston(702).

(8)

Remove valve casing(303) from casing
(301). Then, remove the valve plate(131)
from valve casing(303) with care.

(7)

Remove plug(469) from valve casing
(303) and spring(355), plunger(351).
Be careful not to damage the plunger seat
assembly.

(6)

※

32038SM05

32038SM06

32038SM07

32038SM08

8-73-5

Remove brake piston(702) from casing
(301).

(9)

Remove snap ring(437) with plier and
remove the front cover(304) from
casing(301).
Front cover could be removed with sliding
shaft if necessary.

(12)

※

Remove friction plate(742) and separate
plate(743) from casing(301).

(11)

Remove the cylinder(111) from the output
shaft (101) with the motor positioned
horizontally. Remove piston(121),
retainer(123), spherical bushing(113),
spacer (117) and shoe plate(124).
If shoe plate would not removed easily, try
again after procedure(14).

(10)

※

32038SM09

32038SM10

32038SM11

32038SM12

8-73-6

Proceed with following job only when
necessary.

Remove the snap ring(432), spacer(106)
from drive shaft(101) and remove the
cone of roller bearing(443) by press.
Do not reuse bearings.

Remove oil seal(491) from front cover
(304).

(15)

Remove the shoe plate(124) from casing
(301).

(14)

Remove drive shaft(101) from casing (301).

(13)

①

※

②

32038SM13

32038SM14

32038SM15

32038SM16

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