Takeuchi Hydraulic excavator TB1140 (Serial No. 514400002~). Operator's Manual

DISASSEMBLY AND ASSEMBLY

SLEW MOTOR 4

Assembly

Reversal prevention valve

1. Insert the filter (9), washer (8), and orifice (7).

Orifice: 4.9 N·m ± 1 N·m

G4D615

2. Insert the orifice (6).

Orifice: 2.45 N·m ± 0.49 N·m

3. Insert the plug (5) with attached O-ring.

Orifice: 61.8 N·m ± 2.9 N·m

G4D614

4. Insert the sleeve (4).

5. Insert the check valve assembly (3) and the spring

(2).

6. Insert the plug (1) with attached O-ring.

Plug: 61.8 N·m ± 2.9 N·m

G4D613

SLEW MOTOR

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DISASSEMBLY AND ASSEMBLY

SLEW MOTOR 4

Brake valve and hydraulic motor

1. Assemble the timer valve.

• Be careful not to damage attachment surfaces.

a. Insert the spool (33) and the spring (32).

b. Insert the plug (31) with attached O-ring.

Plug: 39.2 N·m ± 2.0 N·m

K3D644

2. Insert the washer (27), spring (26), washer (25), and

snap ring (24) into the cylinder block.

• Attach the washer (27) with the surface (A) on the

cylinder block side.

E5D622

3. Insert the pin (23) into the cylinder block.

• Grease the pin.

4. Insert the guide (22).

5. Insert the shoe holder (14) into the piston assembly

(21), and insert the shoe holder (14) and piston as-

sembly (21) into the cylinder block.

• Apply enough hydraulic oil to the parts before in-

serting them.

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

• Press-fit the bearing into the shaft using the press-

fitting jig (E).

K3D643

SLEW MOTOR

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DISASSEMBLY AND ASSEMBLY

SLEW MOTOR 4

7. Insert the oil seal into the case.

• Grease the oil seal.

• Use the press-fitting jig (K) to push the oil seal all

the way into the case.

8. Insert the pinion shaft (29) into the motor housing.

• Press-fit the pinion shaft into the motor housing

using the press-fitting jig (F).

9. Attach the swash plate (28) to the motor housing.

• Grease side A.

10. Attach the cylinder block (6) to the housing.

• When attaching, be careful not to allow the pins

and shoe holder to come loose from the cylinder

block.

11. Insert the center discs (20) and the friction discs

(19).

• Line up the positions of the gaps in the spline

teeth.

SLEW MOTOR

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DISASSEMBLY AND ASSEMBLY

SLEW MOTOR 4

12. Insert the collar (17) with attached O-rings.

13. Insert the brake pistons (15) with attached O-rings

into the motor housing.

• Insert the brake pistons so that position (A) for the

6.4-mm-diameter pin hole is at the position in the

diagram at right.

• Press-fit the brake piston using the press ma-

chine.

14. Insert the sixteen large springs (34), the eight small

springs (35), and the O-rings.

• Insert the eight small springs (35) into the loca-

tions indicated in the diagram at right.

15. Attach the O-ring and backup ring to the relief valve

(12).

16. Insert the relief valve into the cover.

• Do not loosen the set screw (13).

Plug: 373 N·m ± 20 N·m

SLEW MOTOR

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DISASSEMBLY AND ASSEMBLY

SLEW MOTOR 4

17. Insert the check valve into the valve body.

a. Insert the spring (10) and the poppet (11).

b. Insert the plug (9) with attached O-ring into the

cover.

Plug: 157 N·m ± 10 N·m

18. Insert the bearing (4) into the valve body.

19. Insert the pin and the valve plate (3).

• Grease the backside of the valve plate to prevent

the pin from falling out.

• After inserting the pin, tap location (A) with a

punch to swage the valve plate into place.

20. Attach the valve body (2), and secure it using the

cap screws.

• Be careful not to allow the valve plate to fall.

Cap screw: 294 N·m ± 20 N·m

SLEW MOTOR

4N0AS00

DISASSEMBLY AND ASSEMBLY

SLEW MOTOR 4

4. Attach the cover to the pinion shaft.

• Attach the seal ring to the cover.

5. Insert the bearing into the pinion shaft.

• Press-fit the bearing into the pinion shaft using the

press-fitting jig (G).

• Grease the bearing with SHELL RETINAX HD-2

grease or an equivalent.

6. Insert the pinion shaft into the case.

• Press-fit the pinion shaft into the case using the

press-fitting jig (B).

7. Attach the cover, and affix it in place using the cap

screws.

Cap screw: Loctite #242

Cap screw: 24.5 N·m ± 4.9 N·m

SLEW MOTOR

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DISASSEMBLY AND ASSEMBLY

SLEW MOTOR 4

8. Insert the bearing into the pinion shaft.

• Grease the inner surfaces of the inner race on the

bearing.

• Press-fit the inner race into the pinion shaft using

the press-fitting jig (H).

9. Attach the ring nut to the pinion shaft.

10. Attach the stopper tool (I) and socket tool (J) to the

ring nut.

11. Use a torque multiplier wrench to tighten the ring nut.

Ring nut: 44 N·m to 48 N·m (Using a torque mul-

tiplier wrench)

Ring nut: 1100 N·m to 1200 N·m (Using a stan-

dard torque wrench)

SLEW MOTOR

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DISASSEMBLY AND ASSEMBLY

SLEW MOTOR 4

20. Attach the sun gear.

• Check to ensure that the part is at the below di-

mensions before attachment to the motor assem-

bly.

Slew motor

1. Attach the hydraulic motor (1) to the reduction gears

(2), and secure it in place using the cap screws.

Cap screw: 85 N·m ± 4.3 N·m

K3D627

2. Attach the O-ring to the valve body.

3. Insert the reversal prevention valve into the valve

body, and secure it in place using the cap screws.

Cap screw: 32.4 N·m ± 2.0 N·m

K3D626

SLEW MOTOR

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DISASSEMBLY AND ASSEMBLY

SLEW MOTOR

Inspection and adjustments

Use limit for parts

Brake valve

Part

Criteria

Action

Check valve,

• If there is severe damage to sliding parts or excessive surface rough-

•

Replace

piston

ness

• If there is a great amount of looseness occurring between the body

•

Replace

and the check valve, piston

• If there is severe damage to the seat or seating is not uniform

•

Replace

Housing

• If there is severe damage to sliding parts or excessive surface rough-

•

Replace

ness

• If there is damage, etc. that allows oil leakages to occur

•

Replace

Relief valve as-

• If there are abnormal drops in the set pressure

•

Replace

sembly

• If there is vibration due to the set pressure being unstable

•

Replace

• If there is increased leakage due to faulty seating

•

Replace

Spring

• If there is a high degree of breakage or deformation

•

Replace

Hydraulic motor

Standard

When replacement

Part

Action

dimension

recommended

Clearance (S) be-

0.02 mm

0.04 mm (0.0016 in.)

Replace the cylinder block

tween the piston

(0.0008 in.)

and swash plate assembly

and cylinder bore

S = D-d

4I0AF22Z

Amount of loose-

0.15 mm

0.4 mm (0.016 in.)

Replace the cylinder block

ness (S) between

(0.006 in.)

and swash plate assembly

the piston and

shoe

4I0AF23Z

Bearings

If there is flaking or

Replace

pitching on the rolling

surface

Sliding surface (1)

If there is roughness

Repair with a lapping tool

of the cylinder

on the sliding surfac-

(Powder #1000) or replace

block

Sliding surface (2)

Replace

of the port block

4N0AF30Z

SLEW MOTOR

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DISASSEMBLY AND ASSEMBLY

SLEW MOTOR

Reduction gears

Part

Criteria

Action

Drive gear,

•

If there is pitting, abrasion, etc. occurring on the surface of the gear

•

Replace

housing, inter-

teeth

nal gear

•

If the amount of looseness between the housing, gears and the motor

•

Replace

joints has increased due to spline wear

Planetary gear

•

If there is pitting, abrasion, etc. occurring on the surface of the gear

•

Replace

teeth

•

If there is flaking, abrasion, etc. occurring on rolling surfaces of the

•

Replace

needle bearings

Needle bear-

•

If there is flaking, abrasion, etc. occurring on rolling surfaces of the

•

Replace

ing, planetary

needle bearings and shafts

shaft

•

If there are indentations, etc. occurring on rolling surfaces of the nee-

•

Replace

dle bearings and shafts

•

If there are abnormalities occurring in the rotation of the bearings

•

Replace

(abnormal noise generated, rotation not smooth, etc.)

Carrier, shaft

•

If there is a great amount of looseness occurring between the carri-

•

Replace

ers, shafts and the planetary shafts

Shaft

•

If the amount of looseness between the shaft and the pinion has in-

•

Replace

creased due to spline wear

Thrust washers

•

If there is an excessive amount of wear occurring

•

Replace

Ball bearing,

•

If there are abnormalities occurring in rotation (abnormal noise gen-

•

Replace

roller bearing

erated, rotation not smooth, etc.)

•

If there is flaking, abrasion, etc. occurring on rolling surfaces

•

Replace

•

If there are indentations, etc. occurring on rolling surfaces

•

Replace

Collar, oil seals,

•

If there is damage, etc. that allows oil leakages to occur

•

Replace

O-rings

Reversal prevention valve

Part

Criteria

Action

Check valve

• If there is severe damage to sliding parts or excessive surface rough-

•

Replace

ness

• If there is a great amount of looseness occurring between the body

•

Replace

and the check valve

• If there is severe damage to the seat or the seating is not uniform

•

Replace

Body

• If there is severe damage to sliding parts or excessive surface rough-

•

Replace

ness

• If there is damage, etc. that allows oil leakages to occur

•

Replace

Spring, sleeve

• If there is a high degree of breakage or deformation

•

Replace

SLEW MOTOR

4N0AS00

DISASSEMBLY AND ASSEMBLY

SWIVEL JOINT

Disassembly and Assembly

The numbers in parentheses () listed after the names of

parts in this document do not match the numbers used in

the construction diagrams and parts lists.

General Precautions

• Perform disassembly and assembly work in a clean

place. Provide clean containers to hold parts during

disassembly.

• Clean around the ports before disassembly. Remove

paint around connectors with a wire brush.

• Clean the disassembled parts with wash oil.

• Put alignment marks on all parts to reassemble them in

the same positions.

• After each disassembly, replace all seals and apply a

thin layer of grease to them.

• Check each part for abnormal wear or seizing. Re-

move any burrs with sandpaper.

Disassembly

1. Take out the bolts and remove the hub from the

flange (1).

• Hold the hub in a vise.

• During assembly, use a pipe on the stopper pin of

the shaft to check that the shaft rotates smoothly.

Bolt: 24.5 to 39.2 N·m

4O0AF03Z

2. Remove the O-ring (2), snap ring (3) and thrust ring

(4).

• During assembly, ensure that the snap ring is

firmly engaged in the groove.

4O0AF04Z

SWIVEL JOINT

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DISASSEMBLY AND ASSEMBLY

SWIVEL JOINT

3. Remove the shaft (5) from the hub.

• Place a knock pin (6) against the end of the shaft

and tap it with a hammer.

• Select a knock pin made of a material such as

copper or plastic.

• During assembly, apply a thin coating of hydrau-

lic oil to the outer circumference of the shaft.

4O0AF05Z

4. Remove the dust seals from the shaft.

4O0AF06Z

5. Remove the seals from the inside diameter of the

hub.

• Check the positions of the seals in the construc-

tion diagram.

• Remove the O-ring with an awl or similar pointed

tool.

• Do not strongly deform or bend localized portions

of the slipper seal.

• During assembly, make sure that the O-ring is not

twisted.

4O0AF07Z

Assembly

For assembly, refer to the construction diagram and re-

verse the disassembly procedure.

SWIVEL JOINT

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DISASSEMBLY AND ASSEMBLY

SWIVEL JOINT

Inspection and adjustment

Inspection procedures and remedial actions

Inspection interval

Inspection point

Inspection procedure

Action

2000 hours

Seals preventing ex-

Check if oil is leaking externally.

If a leak is found, replace the

ternal leakage of oil

O-rings.

4000 hours

All seals

Replace all seal parts.

Disassemble and in-

All sliding surfaces

Check for abnormal wear, scratch-

Remedy in accordance with

spect regardless of

ing, or corrosion due to seizing or

the use limit of parts.

leaks

trapped foreign matter.

Disassembly due to

All parts

Check for abnormal wear, scratch-

Remedy in accordance with

malfunction

ing, or corrosion due to seizing or

the limit of use of parts.

trapped foreign matter.

Replace the seal kit.

Use limit for parts

Hub, shaft

Part

Criteria

Action

Areas in sliding contact

•

High-frequency induction-hardened surfaces worn

•

Replace

with seals

away; peeling due to seizing or trapping of foreign

matter

Sliding surfaces of hub

•

Abnormal wear or scratches 0.1 mm deep or more

•

Replace

and shaft (excepting

due to seizing or trapping of foreign matter

seals)

•

Scratches 0.1 mm deep or more

•

Repair with a grindstone

Sliding surfaces of

•

Wear exceeding 0.5 mm or abnormal wear

•

Replace

thrust ring

•

Wear not exceeding 0.5 mm

•

Repair to make surfaces smooth

•

Repairable scratches due to seizing or trapping of

•

Repair to make surfaces smooth

foreign matter that do not exceed the 0.5 mm wear

limit

Flange

Part

Criteria

Action

Areas in sliding contact

•

Wear exceeding 0.5 mm or abnormal wear

•

Replace

with shaft

•

Wear not exceeding 0.5 mm

•

Repair to make surfaces smooth

•

Repairable scratches due to seizing or trapping of

•

Repair to make surfaces smooth

foreign matter that do not exceed the 0.5 mm wear

limit

Thrust ring

Criteria

Action

Wear exceeding 0.5 mm or abnormal wear

Replace

Wear not exceeding 0.5 mm

Repair to make surfaces smooth

Repairable scratches due to seizing or trapping of foreign matter that do not ex-

Repair to make surfaces smooth

ceed the 0.5 mm wear limit

SWIVEL JOINT

4O0AQ00

DISASSEMBLY AND ASSEMBLY

SWIVEL JOINT

Inspection after assembly

After assembly, perform an oil leak test on each circuit

using the apparatus shown in the figure.

4O0AF08Z

1. Connect the pipe (3) from the hydraulic pump (2) to

the shaft (1) side port.

2. Connect the pressure gauge (5) to the hub (4) side.

• Increase the pressure gradually to 20.6 MPa while

adjusting the relief valve (6). Perform the leak test

for one minute.

• Open the neighboring ports on both sides and vi-

sually check for leaks from the ports.

• Perform a color check to detect external leaks.

SWIVEL JOINT

4O0AQ00

TROUBLESHOOTING

This “Troubleshooting” section describes the fault diagnosis and corrective actions mainly for hydraulic systems. The

cause of the problem can be investigated by following the steps in the chart shown at the beginning of each item.

Notes on troubleshooting and servicing

1. Do not disassemble the faulty part without first investigating the following.

a. Ask the user the following questions.

• The situation when the fault occurred.

• Any abnormalities or changes before the fault occurred.

• Any faulty parts other than the part in question.

• Any identical failure in the past

b. Drive the machine yourself and confirm the faulty condition.

• Determine if it is really faulty by referring to the performance criteria. Note that such determination may differ

depending on the person.

Important

By operating the user’s machine, you could make a bad situation worse. Therefore, before driving the machine, always

ask the user’s permission to do so.

c. Determine the cause of trouble based on the information obtained from the user and by driving the machine

yourself. Also remember that once the machine has been disassembled, it is almost impossible to reproduce

the conditions of the trouble, and so there will be no second chance to find out the true cause. Therefore be

sure to find the true cause of the trouble before attempting disassembly.

2. When multiple causes are suspected, start with the simplest one.

3. Think why the trouble occurred and try to correct the root cause of the problem.

5A0AQ00

TROUBLESHOOTING

OVERALL MACHINE

No operation is possible.

Insufficient

Check the hydraulic oil

Add hydraulic oil.

level.

Sufficient

Faulty

• Repair or replace the hy-

Check the hydraulic

draulic pump.

pump.

• Replace the coupling.

1. Check the hydraulic oil level.

Check the hydraulic oil tank level.

“4. Disassembly and assembly, Hydraulic oil

tank”

When adding, use the same brand of oil currently be-

ing used.

“2. Service data, Fuel and lubricant table”

2. Check the hydraulic pump.

• Check the discharge pressure of the main hy-

draulic pump and sub hydraulic pump.

“2. Service data, Performance criteria.”

• Refer to the hydraulic pump assignment table for

details.

Right travel, slew, 1st auxiliary line pip-

ing, boom [2], arm [1]

Main

Left travel, bucket, boom [1], arm [2],

swing

2nd auxiliary line, blade

Lever lock, 2nd speed travel, slew PB

Sub

opened

OVERALL MACHINE

5B0AS00

TROUBLESHOOTING

OVERALL MACHINE

All systems working, but power insufficient.

Insufficient

Check the hydraulic oil

Add hydraulic oil.

level.

Sufficient

The hydraulic pump is

Noise

Replace the seal tape, O-ring

emitting an abnormal

Suction line faulty

and hose.

noise.

No noise

Action appropriate to the

Frothing in the tank

cause of the frothing.

Faulty

Check the main relief

Repair or replace.

valve.

Normal

The hydraulic pump is

Repair or replace.

faulty.

1. Check the hydraulic oil level.

Check the hydraulic oil tank level.

“4. Disassembly and assembly, Hydraulic oil

tank”

When adding, use the same brand of oil currently be-

ing used.

“2. Service data, Fuel and lubricant table”

2. The hydraulic pump is emitting an abnormal noise.

The noise is likely to be caused by cavitation in the

pump, due to a faulty suction line. Check the follow-

ing.

a. The lines for sucking the hydraulic oil.

• Apply grease or oil on the suspected faulty sec-

tions and check for a change. (check if air is

being sucked)

b. Clogging in the suction filter.

c. Apply pressure to the hydraulic oil tank.

“4. Disassembly and assembly, Hydraulic oil

tank”

3. Check the main relief valve.

Measure the relief pressure of the main relief valve.

• If the measured value is within the specifications,

the main relief valve is normal.

“2. Service data, Performance criteria”

OVERALL MACHINE

5B0AS00

TROUBLESHOOTING

OVERALL MACHINE

4. The hydraulic pump is faulty.

If the inside of the pump is excessively worn or dam-

aged, it is likely that metal pieces are in the hydraulic

oil. If this is the case, do the following.

• Replace the elements of the line filter and the re-

turn filter.

• Replace the hydraulic oil or perform flushing.

• When replacing the hydraulic oil, clean the tank

and the suction strainer.

If the pump seal is damaged, replace it.

OVERALL MACHINE

5B0AS00

TROUBLESHOOTING

OVERALL MACHINE

Boom, bucket, slew and arm fail to move or are too slow.

Faulty

• Repair or replace the gear

Check the hydraulic

pump.

• Replace the coupling.

Normal

Faulty

Check the fuse.

Replace the fuse.

Normal

Faulty

Adjust or replace the limit

Check the limit switch.

switch.

Normal

Faulty

Check the lever lock sole-

Repair or replace the lever

noid valve.

lock solenoid valve.

Normal

Faulty

Check the pilot relief

Repair or replace the pilot re-

valve.

lief valve.

Normal

Faulty

Repair or replace the pilot

Check the pilot valve.

valve.

1. Check the hydraulic pump.

Check the pump (P3) that supplies hydraulic pres-

sure for the pilot valve.

“2. Service data, Performance criteria”

Also, check the line filter for possible clogging, and

clean it if necessary.

2. Check the fuse.

Check the fuse in the power supply circuit used to

run the solenoid valve.

OVERALL MACHINE

5B0AS00

TROUBLESHOOTING

OVERALL MACHINE

3. Check the limit switch.

The limit switch can be switched ON by moving the

lever stand to the driving position.

Then, use a tester to check if there is voltage up to

the lever lock solenoid valve.

• The switch is working normally if there is a voltage

present.

“2. Service data, Electrical circuit diagram”

4. Check the lever lock solenoid valve.

Check according to the guidelines below.

a. Turn ON the starter switch.

b. Lightly press down the protruding part on the so-

lenoid end.

c. The limit switch changes from OFF to ON using

the lever stand.

d. If you feel vibration under your fingers when the

spool is moved and the circuit is switched, the le-

ver lock solenoid valve is normal.

5. Check the pilot relief valve.

Measure the relief pressure of the pilot relief valve.

• If the measured value is within the specifications,

the pilot relief valve is normal.

“2. Service data, Performance criteria”

6. Check the pilot valve.

“4. Disassembly and assembly, Pilot valve”

OVERALL MACHINE

5B0AS00

TROUBLESHOOTING

TRAVELING

No right or left travel

Check the operation of

Abnormal

Check the main relief valve

actuators other than the

and pump.

travel motor.

Normal

Faulty

Check the pilot valve

Repair or replace the pilot

(travel).

valve (travel).

Normal

Faulty

Repair or replace the housing

Check the control valve.

block.

Normal

Faulty

Repair or replace the swivel

Check the swivel joint.

joint.

Normal

Faulty

Repair or replace the travel

Check the travel motor.

motor.

1. Check the operation of actuators other than the travel

motor.

• Check whether only the travel operation is faulty.

If the operation of other actuators is also defective,

see Overall machine.

2. Check the pilot valve (Travel).

• Disconnect the hose connecting the pilot valve

and control valve (Pa1, Pb1, Pa6, Pb6) from the

control valve, and attach a pressure gauge to the

disconnected hose.

• Operate the travel lever, and measure the pres-

sure.

• The pilot valve is working normally if the pressure

varies between 0 MPa and 3.9 MPa (0 and 566

psi), according to the lever angle.

• If the measured pressure is found to be abnormal,

check the pilot valve.

TRAVELING

5C0AS00

TROUBLESHOOTING

TRAVELING

3. Check the control valve.

Disconnect the hose connecting the control valve

(A1, B1, A6, B6) and swivel joint from the control

valve, and attach a pressure gauge to the port of the

control valve.

• Operate the travel lever, and measure the pres-

sure.

Supply pressure: 34.3 MPa (4975 psi)

• If the measured pressure is found to be abnormal,

check the control valve.

4. Check the swivel joint.

Disconnect the hose connecting the swivel joint and

travel motor from the travel motor, and attach a pres-

sure gauge to the disconnected hose.

• Fit the pressure gauge to the section indicated by

the arrow.

• Operate the travel lever, and measure the pres-

sure.

• The valve is normal if the measured value stated

below is achieved.

Supply pressure: 34.3 MPa (4975 psi)

• If the measured pressure is found to be abnormal,

check the swivel joint.

5. Check the travel motor.

• If both forward travel and reverse travel are dis-

abled, the counterbalance valve spool (1) of the

travel motor may be stuck in the neutral position.

• If either forward or reverse travel is enabled but

the other is disabled, the counterbalance valve

spool (1) may be stuck in a position other than

neutral.

• Remove the plug (2) of the counterbalance valve,

and trying pushing on the spool (1) with a finger.

The spool (1) is working normally if it smoothly

moves by about 6 mm (0.24 in.).

For issues other than those listed above, check the

hydraulic motor and reduction gears of the travel mo-

tor.

TRAVELING

5C0AS00

TROUBLESHOOTING

TRAVELING

Right or left travel speed decelerates and the machine veers to one side.

Within spec

Is the veering value dur-

Problem caused by the

Normal

ing travel within spec?

combination of devices

Out-of-spec

Check the crawler belt

Faulty

Adjust to the specified crawl-

tension. Check for foreign

er tension and remove the for-

matter caught in the

eign matter.

crawler belt.

Normal

Faulty

Check the pilot valve

Repair or replace the pilot

(travel).

valve (travel).

Normal

Faulty

Repair or replace the housing

Check the control valve.

block.

Normal

Faulty

Repair or replace the swivel

Check the swivel joint.

joint.

Normal

Faulty

Repair or replace the travel

Check the travel motor.

motor.

1. Is the veering value during travel within spec?

If the veering value falls within the specifications, the

machine is normal. The problem is caused by the

combination of devices.

“2. Service data, Performance criteria”

2. Adjust the crawler belt tension.

“2. Service data, Performance criteria”

3. Check the pilot valve (Travel).

“Traveling, No right or left travel”

4. Check the control valve.

“Traveling, No right or left travel”

5. Check the swivel joint.

“Traveling, No right or left travel”

TRAVELING

5C0AS00

TROUBLESHOOTING

TRAVELING

6. Check the travel motor.

Check the movement of the counterbalance valve

spool of the travel motor to ensure that it moves

smoothly.

“Traveling, No right or left travel, Check the trav-

el motor”

Raise the machine using the hoe attachment and

blade, and then run the travel motor under the condi-

tions listed below to obtain a measurement of drain

volume over one minute.

a. Push the button on the air breather of the hydrau-

lic tank to release the internal pressure in the hy-

draulic tank.

b. Disconnect the drain hose connected to the travel

motor, and attach a plug to the disconnected

hose.

c. Attach a drain-measurement hose to the drain

port on the travel motor.

d. Run the travel motor at 1st-speed, and measure

the resultant drain volume.

• Hydraulic oil temp.: 50°C to 60°C (122°F to

140°F)

• Engine: Maximum RPM

• Drain volume: 1.2 L/min. (0.32 US gal./min.) or

less

For issues other than those listed above, check the

hydraulic motor of the travel motor.

5C0AS02

TRAVELING

5C0AS00

TROUBLESHOOTING

TRAVELING

2nd-speed travel is not possible.

Faulty

Check the hydraulic

Repair or replace the pump.

pump.

Normal

Faulty

Check the 2nd speed

Repair or replace.

travel switch.

Normal

Faulty

Check the 2nd-speed so-

Repair or replace the 2nd-

lenoid valve.

speed solenoid valve.

Normal

Faulty

Repair or replace the swivel

Check the swivel joint.

joint.

Normal

Faulty

The travel motor is faulty

Repair or replace.

1. Checking the hydraulic pump.

Check the pump P3 that supplies hydraulic pressure

for the pilot valve.

“2. Service data, Performance criteria”

Also, check the line filter for possible clogging, and

clean it if necessary.

2. Check the 2nd speed travel switch.

a. Press the switch to turn it on. Use a tester to check

if there is a voltage present.

The switch is working normally if there is a voltage

present.

b. Check the harness continuity.

c. Check the switch.

d. Check the controller.

TRAVELING

5C0AS00

TROUBLESHOOTING

TRAVELING

3. Check the 2nd-speed solenoid valve.

Check according to the guidelines below.

a. Turn ON the starter switch.

b. Lightly press down the protruding part on the so-

lenoid end.

c. The 2nd-speed travel switch changes from OFF to

ON.

d. If you feel vibration under your fingers when the

spool is moved and the circuit is switched, the

2nd-speed solenoid valve is normal.

• If the switching is abnormal, check the solenoid

valve.

4. Check the swivel joint.

Disconnect the travel motor end of the hose connect-

ing the swivel joint and travel motor. Attach a pres-

sure gauge to the disconnected hose. Turn on the

2nd-speed switch.

• Fit the pressure gauge to the section indicated by

the arrow.

• Supply pressure: 3.9 MPa (566 psi)

5. The travel motor is faulty.

Repair or replacve the 2nd speed control valve of the

travel motor.

TRAVELING

5C0AS00

TROUBLESHOOTING

SLEWING

No slew movement.

Faulty

Repair or replace the pilot

Check the pilot valve.

valve.

Normal

Faulty

Repair or replace the housing

Check the control valve.

block.

Normal

Pressure too low

Adjust the slew relief

Check the slew pressure.

Adjust to the set pressure.

valve pressure.

Normal

Pressure does not in-

crease

Repair or replace the slew re-

lief valve.

Faulty

Repair or replace the slew

Check the slew motor.

motor.

Normal

Slew bearing is faulty.

Replace

1. Check the pilot valve.

Disconnect the hose between the pilot valve and

control valve (Pa3, Pb3) from the control valve, and

attach a pressure gauge to the disconnected hose.

• Operate the lever (slew), and measure the pres-

sure.

• The pilot valve is working normally if the pressure

varies between 0 MPa and 3.9 MPa (0 and 566

psi), according to the lever angle.

SLEWING

5D0AS00

TROUBLESHOOTING

SLEWING

2. Check the control valve.

Disconnect the hose connecting the control valve

(B3, A3) and slew motor from the control valve, and

attach a pressure gauge to the port of the control

valve.

• Operate the lever (slew), and measure the pres-

sure.

• The valve is normal if the measured value stated

below is achieved.

Supply pressure: 33.3 MPa (4830 psi)

3. Check the slew pressure.

Measure the pressure at the right and left slew relief

valves.

• If the measured value is within the specifications,

the slew pressure is normal.

“2. Service data, Performance criteria”

If the pressure can be adjusted, the slew relief valve

adjustment is incorrect. If the pressure cannot be ad-

justed, the slew relief valve is faulty.

4. Check the slew motor.

<Motor>

Separate the reduction gear (1) from the motor (2),

and try to rotate the motor (2).

• If it rotates

The reduction gear (1) or slew

bearing (3) is faulty.

• If it fails to rotate

The slew motor (2) is faulty.

Separate the reduction gear from the turntable (4),

and try to rotate the pinion by hand.

• If it rotates

The slew bearing (3) is faulty.

• If it fails to rotate

The reduction gear is faulty.

SLEWING

5D0AS00

TROUBLESHOOTING

SLEWING

No right or left slew movement.

Faulty

Repair or replace the pilot

Check the pilot valve.

valve.

Normal

Faulty

Repair or replace the housing

Check the control valve.

block.

Normal

Faulty

Check the slew relief

Repair or replace the slew re-

valve.

lief valve.

Normal

Faulty

Check the check valve in

Repair or replace the brake

the slew brake valve.

valve.

Normal

Repair or replace the slew

Slew motor is faulty.

motor.

1. Check the pilot valve.

The pilot valve spool may be faulty only on the side

where slew movement fails to occur.

“No slew movement, Check the pilot valve.”

2. Check the control valve.

Spool may fail to move only on the side where slew

movement fails to occur.

“No slew movement, Check the control valve.”

3. Check the slew relief valve.

Switch the left and right slew relief valves. If slewing

becomes possible, the relief valve is faulty.

SLEWING

5D0AS00

Takeuchi Hydraulic excavator TB1140 (Serial No. 514400002~). Operator's Manual - page 10