Takeuchi compact excavator TB125, TB135, TB145 / diesel TNE / diesel Yanmar. Service Manual

IV-244

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

General Cautions

• Carry out disassembly and assembly operations in

a clean place and provide clean containers to place
the disassembled parts in.

• Before disassembly, clean around the ports and

remove the paint from each joint using a wire
brush.

• Wash the disassembled parts and dry them with

compressed air. Do not use a rag, as this could
cause clogging of dirt.

• Make match marks on each part so that they will be

assembled in the same positions when reassembled.

• Replace all seals with new ones each time the unit

is disassembled, coating them lightly with grease.

• Check each part to make sure there is no abnormal

wear or seizing and use sandpaper, etc. to remove
any burrs, sharp edges, etc.

Disassembly

Slew Motor

1. Remove the cap screws and then the anti-rebound

valve.

2. Remove the cap screws to disassemble the motor

into the hydraulic motor (1) and the reduction
gear (2).
• Mark the mating position on both the hydraulic

motor and the reduction gear so that they can
be mated correctly when reassembling.

• Fix the hydraulic motor with a vise.

Brake Valve and Hydraulic Motor

1. Remove the cap screws and then the timer valve

(1).
• Be careful not to miss the O-ring.

K3D628

K3D626

K3D627

IV-245

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

2. Remove the cap screws and then the cover (2).

• Fix the hydraulic motor with a vise.
• Be careful not to let the valve plate drop off.

3. Remove the valve plate (3) from the cover.

4. Remove the bearing (4).

5. Remove the orifice (5).

• The orifice is caulked. Do not remove it unless

necessary.

K3D629

K3D630

K3D631

K3D632

IV-246

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

6. Remove the check valve.

a. Remove the plug (6).
b. Remove the spring (7) and check valve (8).

7. Remove the relief valve.

a. Remove the plug (9) and piston (10).

• Do not loosen the set screw nut (11).

b. Remove the springs (12) and (13) and piston

guide (14).
• Use a pair of tweezers.
• Be careful not to damage the piston guide.

c. Remove the relief housing (15).

• Pinch section A with a pair of pliers.
• Be careful not to damage the pinched sec-

tion.

K3D633

K3D634

K3D635

K3D636

K3D637

IV-247

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

8. Remove the brake piston (16).

• Blow the air from the brake release port PB

with care such that the brake piston does not
protrude.

9. Remove the collar (17).

• Use the jig (B).

10. Remove the cylinder block (18), friction discs

(19) and center discs (20).

11. Remove the shoe holder (20) and piston assembly

(21) from the cylinder block.

12. Remove the guide (22) and pins (23) from the

cylinder block.

K3D638

K3D639

K3D640

19
20
19
20

E5D621

IV-248

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

13. Remove the snap ring (24), retainer (25), spring

(26) and retainer (27) from the cylinder block
(18).
• To remove the snap ring, push up the retainer

(25) by using the press and jig (C).

14. Remove the swash plate (28).

• Use the jig (B).

15. Remove the shaft (29).

• Lightly tap the end face with a plastic hammer.

16. Remove the bearing (30) from the shaft (29).

• Use the press and jig (D).

K3D641

K3D642

K3D643

E5D622

IV-249

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

17. Disassemble the timer valve.

• Be careful not to damage or deform the contact

surface.

a. Remove the plug (31).
b. Remove the spring (32) and valve (33).

• Use a pair of tweezers.

c. Remove the orifice (34) from the valve (33).

• Adhesive has been applied to the orifice.

d. Remove the washer (35), orifice (36) and filter

(37) from the valve (33).

Reduction Gears

1. Remove the ring gear (1).

K3D644

K3D645

K3D646

K3D647

IV-250

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

2. Remove the thrust plate (2).

3. Remove the drive gear (3).

4. Remove the planetary gear A (4), needles (5) and

inner race (6).

5. Remove the carrier 1 (7).

6. Remove the snap ring (8) and then the sun gear

(9).

7. Remove the carrier 2 assembly (10).

8. Loosen the screw and remove the thrust plate

(11).
• Loctite has been applied to the screw. Warm-

ing the screw screws (for example, using a
portable drier) will make its removal much
easier.

9. Remove the planetary gear B (12), needle (13)

and inner race (14).

K3D648

2
3

K3D649

K3D650

K3D651

13 12

IV-251

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

10. Remove the U nut (15).

• Do not remove the U nut unless the taper roller

bearing (16) or (17) and/or collar (18) is faulty.
If one of them is faulty, the whole U nut should
be replaced.

• Use the jig (P) to fix the shaft.
• The U nut should be replaced with a new one

every time it is disassembled.

11. Insert the jigs (N) and (Q) in the pinion section of

the shaft (19) to hold down the collar (20).
• Do not remove the shaft unless necessary.

12. Put the jig (E) on the upper part of the shaft and

pull out the shaft by using the press.
• The plates (21) and (22) should be replaced

with new ones every time they are disassembled.

13. Remove the oil seal (23).

• Use a flat blade screwdriver.
• The oil seal should be replaced with a new one

every time it is disassembled.

• Be careful not to damage the outer race of the

taper roller bearing.

14. Remove the outer race (24) of the taper roller

bearing.
• Use the pulley remover (for pulleys of ø85 mm

in diameter) and jig (A).

K3D652

K3D653

K3D654

K3D655

IV-252

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

15. Remove the plug (25) from the case.

Assembly

Brake Valve and Hydraulic Motor

1. Assemble the timer valve.

• Be careful not to damage the rotation section of

the valve.

a. Mount the filter (37), washer (36) and orifice

(35) on the valve (33).
• Position the hole of the orifice (35) as shown

in the figure.

b. Mount the orifice (34) on the valve (33).

• Apply adhesive to section A of the orifice in

advance. Excessive application may clog
the hole.

• Orifice tightening torque:

4.9

1.0 N·m (0.5

0.1 kgf·m)

K3D646

K3D645

K3D656

IV-253

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

c. Mount the valve (33) and spring (32) on the

body.

d. Fit the O-ring to the plug (31) and mount them

on the body.
• Plug tightening torque:

39.2

2.0 N·m (4.0

0.2 kgf·m)

2. Mount the retainer (27), spring (26), retainer (25)

and snap ring (24) on the cylinder block (18).
• To mount the snap ring, push the retainer (25)

by using the press and jig (C).

• Position the retainer (27) so that its tapered

side (A) faces the cylinder block.

3. Fit the pins (23) to the cylinder block.

• Apply grease to the pins.

4. Mount the guide (22).

5. Fit the shoe holder (20) to the piston assembly

(21) and mount them on the cylinder block.
• Apply the hydraulic oil to the rotation section.

6. Insert the bearing (30) into the shaft (29).

• Insert the bearing by using the press and jig (F).

K3D644

E5D621

K3D643

E5D622

IV-254

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

7. Install the shaft (29) in the housing.

• Lightly tap with a plastic hammer to install.

8. Install the switch plate (28) in the housing.

• Apply grease to the side (A) of the swash plate.

9. Install the cylinder block (18) in the housing.

• Be careful not to let the shoe holder or other

parts drop off.

10. Mount three center discs (20) and three friction

discs (19).
• Total number of friction discs: 3
• Total number of center discs: 3
• Be careful of the mounting order.

11. Fit the O-ring to the collar (17) and insert them in

the housing.
• Use the jig (G) and the press to insert.

K3D641

K3D640

19
20
19
20

K3D639

K3D657

IV-255

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

12. Fit the O-ring to the brake piston (15) and insert

them in the housing.
• Use the jig (G) and the press to insert.
• The screw M6 position (A) should be as shown

in the figure.

• Insertion depth (B) should be 0 to 1 mm.

13. Mount the springs (16) and O-ring (17).

14. Assemble the relief valve assembly.

a. Fit the O-ring and backup ring to the piston

(10).

b. Fit the backup ring and O-ring to the plug (9).

c. Fit the backup ring and O-ring to the relief

housing (15).

d. Install the spring sheet (38) and spring (13) in

the relief housing (15).
• Be careful of the mounting direction of the

spring sheet (38).

e. Install the guide (14) in the relief housing (15).
f. Mount the spring (12) on the guide(14).

K3D660

K3D661

K3D658

K3D659

IV-256

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

g. Unite the relief housing (15), plug (9) and

piston (10).

h. Mount the relief valve assembly on the cover.

• Be careful not to let the spring jump out.
• Plug tightening torque:

275

10 N·m (28

1 kgf·m)

• Do not loosen the lock nut (11).

15. Mount the check valve.

a. Mount the spring (7) and poppet (8) on the

cover.

b. Fit the O-ring to the plug (6) and mount them

on the cover.
• Plug tightening torque:

157

10 N·m (16

1 kgf·m)

16. Insert the bearing (4) into the cover.

• Use the jig (H) and the press to insert.

17. Fit the pin (39) to the cover.

• Caulk the pin at two positions by using a

punch. Protrusion due to caulking should not
be more than 1 mm.

K3D634

K3D633

K3D631

K3D662

K3D663

IV-257

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

18. Mount the orifice (5) on the cover.

• Caulk the circumference of the orifice female

screw by using a punch.

• Orifice tightening torque:

2.45

0.49 N·m (0.25

0.05 kgf·m)

19. Mount the pin and valve plate (3) on the cover.

• Apply grease on the back of the valve plate (the

side facing the cover) in advance to prevent the
plate from dropping off.

20. Mount the cover (2) on the case and fix them with

the cap screws.
• Be careful not to let the valve plate drop off.
• Cap screw tightening torque:

128

7 N·m (13.1

0.7 kgf·m)

21. Mount the timer valve (1).

a. Fit the O-ring to the case.
b. Mount the timer valve and fix it with the screw.

• Screw tightening torque:

1 N·m (1

0.1 kgf·m)

K3D632

K3D630

K3D629

K3D628

IV-258

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

Reduction Gears

1. Mount the collar (20) and plates (21) and (22) on

the shaft (19).
• Apply grease to the case side of the plate (22).
• The plates (21) and (22) should be new ones.

2. Insert the inner race (26) of the taper roller bear-

ing into the shaft.
• Use the jig (I) and the press to insert.

3. Fit the O-ring to the shaft and mount the collar

(18).
• Be careful of the mounting direction of the

collar (18).

• Use the jig (I) and the press to mount.

4. Insert the oil seal (23) into the case.

• Use the jig (K) and the press to insert.
• The installation dimension (A) after insertion

should be 4.25 mm.

5. Insert the outer race (24) of the taper roller bear-

ing into the case.
• Use the jig (L) and the press to insert.

K3D664

K3D654

IV-259

HYDRAULIC UNITS

SLEW MOTOR

TB125, 135, 145

6. Put grease into the inner race of the taper roller

bearing.
• Grease type: Shell ALVANIA Grease
• Grease volume: 62~72 mL

7. Mount the shaft (19) and plug (25) on the case.

• The shaft (19) should be mounted before mount-

ing the plug (25).

8. Mount the inner race (27) of the taper roller

bearing to the shaft.
• Use the jig (M) and the press to mount.

9. Mount the U nut (15).

• Be careful of the mounting direction of the U

nut.

• Fix the shaft with the jig (P) and tighten it with

the jig (O).

• Be sure to use a new U nut.
• U nut tightening torque:

933

49 N·m (94

5 kgf·m)

K3D652

E5D629

Takeuchi compact excavator TB125, TB135, TB145 / diesel TNE / diesel Yanmar. Service Manual - page 36