Takeuchi compact excavator TB125, TB135, TB145 / diesel TNE / diesel Yanmar. Service Manual - page 17

MACHINE CONFIGURATION

SECURITY SYSTEM

III-192

TB125, 135, 145

LOSS OF AN IMMOBILIZER KEY

If you lose an Immobilizer Key, perform step 1 or 2 below to prevent the lost key from being misused.

1. De-register the lost Immobilizer Key (without purchasing a new Immobilizer Key)

Delete the registration of the lost Immobilizer Key with the controller on the machine to prevent its use.

2. Re-register a new Immobilizer Key (purchasing a new Immobilizer Key)

Re-register a new Immobilizer Key with the controller and delete the old registration of the lost key.

For details of registration or de-registration, refer to “De-registering or Re-registering an Immobilizer Key” on the
next page.

OBTAINING MULTIPLE IMMOBILIZER KEYS

You can register up to five Immobilizer Keys with one machine, provided the key has not been registered with
another machine.

For adding a registration, please refer to “De-registering or Re-registering an Immobilizer Key” on the next page.

MACHINE CONFIGURATION

SECURITY SYSTEM

III-193

TB125, 135, 145

De-registering or Re-registering an Immobilizer Key

Prepare the following:

1. Registration Key of the machine you want to de-register/re-register with
2. All Immobilizer Keys that have been registered with the above machine (except the lost one)
3. A new Immobilizer Key you want to register (for re-registration only)
4. Clock/Timer (capable of counting 10 seconds): recommended for assured registration

Checking before Registration:

• Check that you can start the engine with the Registration Key of 1 above. If not, the key is probably the Registration

Key of another machine. Prepare the correct Registration Key.

Important:

You must use the authorized Registration Key to perform the registration.

• Check that you can start the engine with the Immobilizer Key of 2 above. If not, the key is probably the Immobilizer

Key of another machine. Prepare the correct Immobilizer Key.

Important:

Do not try to register an Immobilizer Key that has already been registered with a different
machine.

Notes

• You cannot start the engine with the Immobilizer Key of 3 above, as it is unregistered.

• Trying to start the engine with the wrong key five times for three minutes will activate the horn alarm

for security.

• If a key fails to start the engine, do either of the following to prevent the horn alarm from being activated.

(1) Use the Authorized Key (engine-starting key) to start the engine.
(2) Pull out the key and wait for at least three minutes.

• If the horn starts sounding, turn the starter switch position from OFF to ON with an authorized key to

stop the horn alarm.

MACHINE CONFIGURATION

SECURITY SYSTEM

III-194

TB125, 135, 145

Registration Procedure

Insert the Registration Key (see 1 on the previous
page) into the starter switch and turn it from OFF
to ON.

Wait for 10 (or 5 to 15) seconds at the ON position.

Turn it back to OFF, and pull out the Registration
Key.

Insert one of the Immobilizer Keys (see 2 or 3 on
the previous page) into the starter switch and turn
it from OFF to ON.

Wait for 10 (or 5 to 15) seconds at the ON position.

Turn it back to OFF, and pull out the Immobilizer
Key.

Finished the above steps with all Immobilizer Keys
to be registered?

Insert the Registration Key (see 1 on the previous
page) into the starter switch and turn it from OFF
to ON.

Wait for 10 (or 5 to 15) seconds at the ON position.

Turn it back to OFF, and pull out the Registration
Key.

Important

During the registration procedure, you may find that the key you are trying to register is a wrong key or
that you moved to a wrong step. If this happens, stop the registration where you are, wait for at least 30
seconds, then restart the procedure from the first step.

Can you start the engine with any key (Registration
Key or Immobilizer Keys) registered through the
steps above?

Registration completed.

Repeat these steps for each Immobilizer
Key to be registered (all keys of 2 and 3 on
the previous page).

Within 10 seconds af-
ter turning to OFF

Unsuccessful registration. Return to the first step.

Yes.

No.

Within 10 seconds af-
ter turning to OFF

Yes.

Within 10 seconds after turning to OFF

No.

MACHINE CONFIGURATION

SECURITY SYSTEM

III-195

TB125, 135, 145

TROUBLESHOOTING

If the engine fails to start, check the following.

Checking the Machine

Important

You may use the Registration Key to check the
system, but take care because if you lose or
damage it, the system may need to be replaced.

Are the battery terminals connected?

Is the battery voltage normal?

Is the starter motor working?

Connect the battery.

Replace the battery.

The machine is faulty.

Yes.

Yes.

No.

Checking the Key

Are you using a key registered with the machine
you want to operate?

No idea.

Refer to “Check the Name of the
Key” of the instruction manual
of the office, and check whether
the key has been registered with
the machine in question.

Yes.

Can you start the engine with another key (Immo-
bilizer Key or Registration Key) registered with
the machine?

Use a key registered with the
machine.

The key is faulty. Use another
registered key or register a new
immobilizer key.

Registered.

No.

No.

Yes.

No.

Unregistered

The name on the key is illegible.

Yes.

<Proceed to Checking the System on the Machine>

No.

MACHINE CONFIGURATION

SECURITY SYSTEM

III-196

TB125, 135, 145

Is the fuse on the main harness blown?

Checking the System on the Machine

Replace the fuse.

Yes.

No.

Is the antenna in the starter switch section installed
in the proper location?

Remove the connector (Pin 2) connecting the an-
tenna and main harness, and measure the resistance
between the two pins on the antenna side. Is the
resistance value 1.2 ohms or less?

Yes.

No.

Install the antenna properly and restart the engine.

Antenna is faulty. Replace the antenna.

No.

No.

If the restarting fails

Checking the Connector Terminals

Check the continuity of the connector terminals connected to the controller on the machine and make
sure the voltage is proper.

Terminal No.

Function

Check

Condition

Normal value

5 - earth 

∗

1

7 - earth

8 - earth

1 - earth

2 - 10

Power

ST

ON

GND

Antenna

Voltage

Voltage

Voltage

Continuity

Resistance

Normal

Starter switch at “START”

Starter switch at “ON”

Normal

Normal

Battery voltage

Battery voltage

Battery voltage

Continuity exists

1.2 

Ω

 or less

∗

1: Connect the earth to the frame grounding.

Connector Terminal No.

1

5

2

6

7

8

3

9

4

10

Controller is faulty.
Replace the system.

Check the connectors and their connections in the
system according to the installation manual.
If there is no problem with the connections, the
harness may be faulty.
Replace the harness.

Normal

Abnormal

IV-1

TB125, 135, 145

IV .

  HYDRAULIC  UNITS

IV-2

HYDRAULIC UNITS

TB125, 135, 145

CONTENTS

Hydraulic Pump (TB125: S/N 12510009~12512125, TB145) ............................................................................. 3

Hydraulic Pump (TB125: S/N 12512126~, TB135) ........................................................................................... 33

Control Valve (TB125, TB135) .......................................................................................................................... 47

Control Valve (TB145) ........................................................................................................................................ 65

Pilot Valve

(TB125: S/N 12510003~12514525, TB135: S/N13510004~13514050, TB145: S/N 14510004~14513260) ....... 85

Pilot Valve (TB125: S/N 12514526~, TB135: S/N 13514051~, TB145: S/N 14513261~)............................. 92-1

Pilot Valve (Swing) ........................................................................................................................................ 92-11

Shut-Off Valves .............................................................................................................................................. 92-15

Proportional Control Solenoid Valve (TB145) .............................................................................................. 92-21

Cylinders .............................................................................................................................................................. 93

Bucket Cylinder for Telescopic Arm (TB145) .................................................................................................. 123

Tensioning Cylinder .......................................................................................................................................... 135

Travel Motor (TB125: S/N 12510009~12514525) ........................................................................................... 139

Travel Motor (TB125: S/N 12514526~) ........................................................................................................ 168-1

Travel Motor (TB135) ....................................................................................................................................... 169

Travel Motor (TB145) ....................................................................................................................................... 189

Slew Motor (TB125) ......................................................................................................................................... 205

Slew Motor (TB135) ......................................................................................................................................... 223

Slew Motor (TB145) ......................................................................................................................................... 237

Swivel Joint ....................................................................................................................................................... 263

IV-3

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

HYDRAULIC PUMP (TB125: S/N 12510009~12512125, TB145)

CONSTRUCTION

  1. Shaft
  2. Swash Plate
  3. Cylinder Block
  4. Cover
  5. Control Spring
  6. Control Piston

  7. Gear Pump
  8. Housing
  9. Solenoid Valve
10. Relief Valve
11. Valve

K3D100

9

10

11

8

5

2

1

3

6

4

7

IV-4

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

Shaft

  1. Shaft
  2. Seal Case
  3. Bearing
  4. Snap Ring
  5. Oil Seal
  6. O-ring
  7. Snap Ring
  8. Snap Ring

Swash Plate

  1. Swash Plate
  2. Plate
  3. Distance Piece
  4. Bearing
  5. O-ring

Cylinder Block

  1. Piston
  2. Cylinder Block
  3. Retainer
  4. Plate
  5. Guide
  6. Spring
  7. Pin
  8. Spring Seat
  9. Snap Ring

K3D101

1

2

5

7

6

4

3

8

K3D102

4

3

5

2

1

K3D103

9

8

6

2

7

1

4

5

3

IV-5

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

Cover

■

TB125

■

TB145

  1. Cover
  2. Valve Plate
  3. Pin
  4. Plug
  5. Orifice
  6. Plug
  7. Bearing
  8. Plug
  9. O-ring
10. Packing

  1. Cover
  2. Valve Plate
  3. Pin
  4. Plug
  5. Orifice
  6. Plug
  7. Bearing
  8. Plug
  9. O-ring
10. O-ring
11. O-ring

Control Spring

  1. Spring Seat
  2. Spring Seat
  3. Cover
  4. Spring
  5. O-ring
  6. Adjusting Screw
  7. Spring
  8. Nut
  9. Shim

E5D100

4

5

1

7

3

2

10

5

9

6

8

8

4

4

8

5

6

6

K3D104

7

3

5

1

11

2

10

5

9

6

4

8.9

8.9

5

6

4

6

K3D105

1

4

7

9

2

5

8

6

3

IV-6

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

  1. Cylinder
  2. Piston
  3. Pin
  4. Pin
  5. O-ring
  6. Conical Spring Washer
  7. Spring Seat
  8. O-ring
  9. O-ring

Control Piston

Gear Pump (P3)

  1. Gear Pump
  2. Flange
  3. Case
  4. Drive Gear
  5. Driven Gear
  6. Bushing

  7. Plate
  8. Guide
  9. Coupling
10. Bushing
11. O-ring
12. O-ring

13. Seal Ring
14. Angular Ring
15. Pin
16. O-ring
17 O-ring
18. O-ring

K3D106

1

3

5

2

4

3

9

8

6

7

TB145

TB125

K3D107

16

17

12

12

1

13

7

3

4

14

10

9

8

11

15

6

5

6

15

2

18

IV-7

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

Gear Pump (P4)

  1. Frame
  2. Housing
  3. Drive Gear
  4. Driven Gear
  5. Plate
  6. Metal
  7. Backup Ring
  8. Pin
  9. Seal Ring
10. Coupling
11. Snap Ring
12. O-ring

Solenoid Valve

  1. Body
  2. Spool
  3. O-ring
  4. O-ring
  5. Spring
  6. Filter Element
  7. Solenoid A
  8. Solenoid B

Relief Valve

  1. Spool
  2. Screw
  3. O-ring
  4. Spring
  5. Nut
  6. Shim

K3D108

2

3

8

1

11

10

6

4

5

12

9

7

K3D109

4

6

4

X

X

Y

Y

7

3

2

8

3

2

5

1

Y-Y

X-X

K3D110

5

3

4

2

6

1

IV-8

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

OPERATION

Piston Pump

This pump is a variable displacement piston pump
with a single cylinder block, which discharges two
equal volumes.
Ten pistons (2) are installed in the cylinder block (1),
and the end surface is in contact with the valve plate
(3). The suction port C and the discharge port A of the
pump P1 and the discharge port B of the pump P2 are
arranged in the valve plate (3). On the other hand, the
swash plate (4) is fastened to the housing at a given
inclination, and the pistons (2) rotate along this swash
plate (4).
When the shaft (5) is rotated, the cylinder block (1)
rotates, the pistons (2) in the cylinder block execute
reciprocating movement along the swash plate (4),
and the pump executes suction and discharge. At this
time, the pistons in contact with the discharge port A
of the valve plate (3) operate as the pump P1, while the
pistons in contact with the discharge port B operate as
the pump P2.
In this way, the ten pistons (2) execute one suction and
discharge stroke with each revolution of the cylinder
block (1), so that suction and discharge are executed
continuously when the shaft (5) is rotated continu-
ously.
As the piston stroke displacement depends on the
inclination of the swash plate (4), the discharge flow
quantity can be changed by changing the inclination
of the awash plate (4).

Discharge volume control

The swash plate (4) is equipped with the bearings (6)
and is mounted on the housing at an inclination that
can be varied. The swash plate (4) is loaded with the
pistons (9) and the piston (10) in opposition to the
spring (7). The discharge pressures from the pumps
P1 and P2 work on the pistons (9). The discharge
pressure from the pump P3 works on the piston (10).
When the discharge pressure is below the value preset
for the spring (7), the inclination of the swash plate (4)
is fixed to the maximum value by the spring (7).

K3D111

4

2

1

3

C

A

B

P1

P2

SUCTION

DISCHARGE

SUCTION STROKE

DISCHAGE STROKE

IV-9

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

When the discharge pressure exceeds the set value of
the spring (7), the swash plate (4) is pushed by the
pistons (9) and (10), the inclination decreases, and the
swash plate is kept at an inclination where the dis-
charge pressure and the spring force are balanced.
When the pressure acting onto the pistons (9) and (10)
increases still further, the inclination of the swash
plate (4) becomes still smaller. The until now inactive
spring (8) also becomes active, and a still higher
discharge pressure will be required to counteract this
spring force.
In this way, the inclination of the swash plate (4) is
changed, the discharge quantity is controlled, the
pump is supplied only with the pressure and the flow
volume required for the load, and the pump loss
pressure is reduced.
As the inclination of the swash plate (4) changes not
only according to the operation pressure of the pumps
P1 and P2, but also according to the operation pres-
sure of the pump P3, the P-Q curve of the piston pump
becomes a curve with effective use of the engine
power (full power control).

Gear Pump

“IV-36”

Solenoid Valve

“IV-37”

K3D112

SET HORSEPOWER

CURVE

A+B

A

FLOW VOLUME Q

Qmax

TO

TA

L

PRESSURE 

∑

P

∑

Pi

10

9

P2

P3

P1

IV-10

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

DISASSEMBLY AND ASSEMBLY

Table of Special Tools

General Cautions

“IV-37”

Disassembly

1. Take out the cap screws and remove the solenoid

valve from the pump.
Place the pump with the shaft facing down onto
the jig (A) so that the shaft end is not in contact
with anything.

2. Remove the cap screws and remove the gear

pump.

Unit: mm

NAME, DIMENSIONS

NAME, DIMENSIONS

JIG (A)

JIG (B) for TB145

JIG (B) for TB125

JIG (C) for TB125

1

2

3

4

K3D117

A

K3D118

IV-11

HYDRAULIC UNITS

HYDRAULIC PUMP

TB125, 135, 145

3. Remove the coupling.

4. Remove the cap screws and remove the cover.

• Remove the cover in horizontal condition.
• Use care, as the valve plate is installed on the

rear.

• When the cover is difficult to remove, tap it

with a plastic hammer.

5. <TB125> Remove the packing.

6. Remove the two springs [inside, outside].

7. Remove the spring seat (1).

K3D119

K3D120