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

IV-12

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

8. Disassemble the cylinder block.

a. Remove the cylinder block from the shaft.

b. Remove the plate from the shaft.

c. Remove the guide (3), the pin (4), the retainer

(5), and the piston (6) from the cylinder block
(7).
• Disassemble the inside of the cylinder block

(7) only when required.

9. Remove the snap ring and remove the oil seal case

(8) and the O-ring.
• Use two flat screwdrivers as shown in the

figure to remove the oil seal case.

10. <TB125> Remove the oil seal from the removed

oil seal case.

E5D101

IV-13

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

11. Remove the shaft while tapping its rear end with

a plastic hammer.

12. Disassemble the swash plate part.

a. Remove the cap screws and remove the plate

(9).

b. Remove the distance piece (10).
c. Remove the bearing (11).

d. Remove the swash plate.

13. Disassemble the cover part.

a. Remove the valve plate.

K3D121

IV-14

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

b. Remove the cap screws and remove the control

piston part.
• Disassemble the control piston part only

when required.

c. Remove the pins (12), piston (13) from the

cylinder (14).

d. Remove the piston (15) for the air-conditioner

(if equipped).

e. Remove the piston (16).

f. Remove the three conical spring washers and

the spring seat.

K3D122

K3D123

K3D124

K3D125

IV-15

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

g. Remove the cap screws and remove the cover.

h. Remove the spring seat, and remove the O-ring

from the spring seat.

14. Disassemble the shaft part.

a. Remove the snap ring.
b. Remove the shaft while tapping it with a plas-

tic hammer.

15. Remove the relief valve.

• The parts inside the relief valve should not be

disassembled unless absolutely necessary.

a. Remove the nut.

• Record the length of the adjusting screw

protrusion before starting the disassembly.

K3D126

IV-16

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

b. Remove the adjusting screw (17).

• Be careful not to miss the shim.

c. Remove the spring (18).
d. Remove the spool (19).

16. Remove the cap screws to disassemble the hy-

draulic pump into the pump P3 and the pump P4.

17. Disassemble the pump P4.

a. Remove the plate, backup ring and seal ring

while pulling the drive gear.

b. Remove the driven gear.

K3D127

K3D128

K3D129

K3D130

IV-17

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

18. Disassemble the pump P3.

a. Remove the bolts and then the flange.

b. Remove the frame.

c. Remove the seal ring.

d. Remove the plate, guide and O-ring.

K3D131

K3D132

K3D133

IV-18

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

e. Remove the plate.

f. Remove the drive gear, driven gear and bush-

ing.

19. Disassemble the solenoid valve.

a. Remove the cap screws and then the solenoids.

• Be careful not to miss the push rod in the

solenoid valve.

b. Remove the spool and spring.
c. Remove the O-ring.

K3D134

K3D135

K3D136

K3D137

IV-19

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

Assembly

1. Assemble the swash plate part.

a. Install the swash plate in the housing.

b. Install the bearing (11).
c. Install the distance piece (10).

• Bearing pre-load:

TB125 .....0.045~0.085 mm
TB145 .....0.08~0.12 mm

d. Install the O-ring in the plate (9).
e. Attach the plate (9) and fix it with the cap

screws.
• Cap screw tightening torque:

12~15 N·m (1.2~1.5 kgf·m)

2. Assemble the shaft part.

a. Use the jig (B) to install the bearing on the

shaft.
• Use the bearing as the base, and use a press

or a plastic hammer.

b. Install the snap ring to fix the bearing.

3. <TB125> Use the press jig (C) to install the oil

seal in the oil seal case.
• Tap with a plastic hammer.
• Apply adhesive (Loctite #572) to the inside of

the oil seal case.

K3D121

IV-20

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

4. Install the shaft in the housing.

• Tap the spline end with a plastic hammer to

positively install the outer race of the bearing
in the housing hole.

5. Install the O-ring.

6. Install the oil seal case with installed oil seal.

• Install the oil seal case so that it is straight.

7. Install the snap ring.

8. Assemble the cylinder block.

a. Install the pin (4) in the cylinder block.

• Apply grease to the pin (4) to prevent its

dropping off.

b. Install the guide (3) in the cylinder block.

• Apply grease to the spherical part of the

guide.

c. Attach the piston (6) to the retainer (5), and

install the retainer (5) in the cylinder block.

IV-21

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

9. Install the plate on the swash plate.

• In order to prevent dropping off, apply grease

at the rear (A) of the plate on the swash plate
side.

10. Install the cylinder block matching the spline of

the shaft.
• Apply grease to the sliding surfaces of the

piston shoes and the plate.

11. Install the spring seat (1).

• Apply grease to the spherical part of the spring

seat.

12. Install the two springs [inside, outside].

13. Assemble the cover unit.

a. Install the spring seat (18), the three conical

spring washers (17).
• Be careful of the installation direction of the

washers.

K3D138

K3D139

K3D125

IV-22

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

b. Install the piston (16).

c. Install the piston (15) for the air-conditioner (if

equipped).

d. Fit the O-rings to the cylinder (14).
e. Apply grease to the two pins (12), the piston

(13) and install them in the cylinder (14).

f. Put the cylinder (14) in position and install the

cap screws.
• Cap screw tightening torque:

28~35 N·m (2.9~3.5 kgf·m)

• Apply Loctite #270.

g. Fit the O-ring to the spring seat and install the

spring seat.

K3D124

K3D123

K3D122

IV-23

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

h. Put the cover in place and install the cap

screws.
• Cap screw tightening torque:

28~35 N·m (2.9~3.5 kgf·m)

i. Apply grease to the rear of the valve plate and

install it to the cover, matching the knock hole.

j. Install a large and a small O-ring in the cover.

14. Install the relief valve.

a. Install the spool (19).
b. Install the spring (18).
c. Fit the shim to the adjusting screw (17) and

install it in the cover.

d. Install the nut.

K3D127

K3D126

IV-24

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

15. Install the cover and install the cap screws.

• Install the cover parallel to the housing instal-

lation surface.

• Cap screw tightening torque:

55~69 N·m (5.6~7.0 kgf·m) ............... TB125
98~123 N·m (10~12.5 kgf·m) ............ TB145

16. Fit the O-rings to the cover.

17. Install the coupling on the end of the main pump

shaft.

18. Assemble the gear pump.

a. Match the bushing and install the rectangular

ring (20).
• Pay attention to the installation direction.

A: DISCHARGE SIDE
B: SUCTION SIDE

K3D140

K3D119

K3D141

IV-25

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

b. Install the bushings assembled as described

above on both sides of the drive gear and the
driven gear, and install them in the housing.

c. Fit the O-ring to the guide (18) and mount them

on the plate (17).
• The O-ring on the guide should come to the

largely-rounded side of the plate circumfer-
ence.

d. Install the plate assembled as described above

in the housing.

e. Install two plates in the housing.

• Be careful of the installation directions of

the plates.

A: DISCHARGE SIDE
B: SUCTION SIDE

K3D135

K3D142

K3D133

K3D134

K3D143

K3D144

IV-26

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

f. Mount the seal ring.

g. Fit two parallel pins to the frame and mount

them on the pump.

19. Assemble the pump P4.

a. Install the drive gear in the housing.

b. Install the driven gear in the housing.

K3D145

K3D146

K3D147

IV-27

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

c. Fit the seal ring and backup ring to the plate.

• Apply grease to the rings in advance to

prevent them from dropping off.

d. Install the plate in the housing.

e. Fit the pins and O-ring to the frame.

f. Install the frame in the housing.

K3D148

K3D149

K3D150

K3D132

Takeuchi compact excavator TB125, TB135, TB145 / diesel TNE / diesel Yanmar. Service Manual - page 18