EBOOK komatsu shop manual PC78US 6

01 GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 011 10 STRUCTURE, FUNCTION AND MAINTENANCE STANDARD. . . . 101 20 TESTING AND ADJUSTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 30 DISASSEMBLY AND ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . 301 50 OTHER SPECIFICATIONS (PC78US6 For Norway). . . . . . . . . . . . 501 90 OTHERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 901

MACHINE MODEL SERIAL NUMBER

• This shop manual may contain attachments and optional equipment that are not available in yourarea Please consult your local Komatsu distributor for those items you may require Materials andspecifications are subject to change without notice

• PC78UU-6, PC78US-6 mounts the 4D95LE-2 and S4D95LE-3-A engine

No of page

01 GENERAL 01-1

20 TESTING AND ADJUSTING 20-1

30 DISASSEMBLY AND ASSEMBLY 30-1

50 OTHER SPECIFICATIONS (PC78US-6 For Norway) 50-1

90 OTHERS 90-1

(16)

table below.

Pages having no marks are those previously revised

or made additions

( ) Page to be deleted Discard

LIST OF REVISED PAGES

Mark Page Revision number

20-218-2 (12)20-218-3 (7)20-218-4 (7)

20-218-6 (12)20-218-8 (17)20-218-9 (12)20-218-10 (12)

20-219-1 (12)20-219-3 (12)20-219-4 (12)20-219-5 (12)20-219-6 (12)20-219-7 (12)20-219-9 (12)20-219-10 (12)20-219-11 (12)

20-357-1 (12)20-357-2 (12)

20-358-1 (5)20-358-2 (7)20-358-3 (7)20-358-4 (7)20-358-5 (7)20-358-6 (12)20-358-7 (7)20-358-8 (12)20-358-9 (12)

50-123-1 (12)50-123-2 (12)

50-124-1 (12)50-124-2 (12)

(18)

SAFETY

SAFETY NOTICE

IMPORTANT SAFETY NOTICE

Proper service and repair is extremely important for safe machine operation The service and

repair techniques recommended by Komatsu and described in this manual are both effective

and safe Some of these techniques require the use of tools specially designed by Komatsu for

the specific purpose

To prevent injury to workers, the symbol k is used to mark safety precautions in this manual

The cautions accompanying these symbols should always be followed carefully If any

danger-ous situation arises or may possibly arise, first consider safety, and take the necessary actions

to deal with the situation

GENERAL PRECAUTIONS

Mistakes in operation are extremely dangerous

Read the Operation and Maintenance Manual

care-fully BEFORE operating the machine

1 Before carrying out any greasing or repairs, read

all the precautions given on the decals which are

fixed to the machine

2 When carrying out any operation, always

wear safety shoes and helmet Do not wear

loose work clothes, or clothes with buttons

missing

• Always wear safety glasses when hitting

parts with a hammer

• Always wear safety glasses when grinding

parts with a grinder, etc

3 If welding repairs are needed, always have a

trained, experienced welder carry out the work

When carrying out welding work, always wear

welding gloves, apron, hand shield, cap and

other clothes suited for welding work

4 When carrying out any operation with two or

more workers, always agree on the operating

procedure before starting Always inform your

fellow workers before starting any step of the

operation Before starting work, hang UNDER

REPAIR signs on the controls in the operator's

compartment

5 Keep all tools in good condition and learn the

correct way to use them

6 Decide a place in the repair workshop to keeptools and removed parts Always keep the toolsand parts in their correct places Always keepthe work area clean and make sure that there is

no dirt or oil on the floor Smoke only in the areasprovided for smoking Never smoke while work-ing

PREPARATIONS FOR WORK

7 Before adding oil or making any repairs, park themachine on hard, level ground, and block thewheels or tracks to prevent the machine frommoving

8 Before starting work, lower blade, ripper, bucket

or any other work equipment to the ground Ifthis is not possible, insert the safety pin or useblocks to prevent the work equipment from fall-ing In addition, be sure to lock all the controllevers and hang warning signs on them

9 When disassembling or assembling, support themachine with blocks, jacks or stands beforestarting work

10.Remove all mud and oil from the steps or otherplaces used to get on and off the machine.Always use the handrails, ladders or steps whengetting on or off the machine Never jump on oroff the machine If it is impossible to use thehandrails, ladders or steps, use a stand to pro-vide safe footing

PRECAUTIONS DURING WORK

11 When removing the oil filler cap, drain plug or

hydraulic pressure measuring plugs, loosen

them slowly to prevent the oil from spurting out

Before disconnecting or removing components

of the oil, water or air circuits, first remove the

pressure completely from the circuit

12.The water and oil in the circuits are hot when the

engine is stopped, so be careful not to get

burned

Wait for the oil and water to cool before

carry-ing out any work on the oil or water circuits

13.Before starting work, remove the leads from the

battery Always remove the lead from the

nega-tive (–) terminal first

14.When raising heavy components, use a hoist or

crane

Check that the wire rope, chains and hooks are

free from damage

Always use lifting equipment which has ample

capacity

Install the lifting equipment at the correct places

Use a hoist or crane and operate slowly to

pre-vent the component from hitting any other part

Do not work with any part still raised by the hoist

or crane

15.When removing covers which are under internal

pressure or under pressure from a spring,

always leave two bolts in position on opposite

sides Slowly release the pressure, then slowly

loosen the bolts to remove

16.When removing components, be careful not to

break or damage the wiring Damaged wiring

may cause electrical fires

17.When removing piping, stop the fuel or oil from

spilling out If any fuel or oil drips onto the floor,

wipe it up immediately Fuel or oil on the floor

can cause you to slip, or can even start fires

18.As a general rule, do not use gasoline to wash

parts In particular, use only the minimum of

19.Be sure to assemble all parts again in their nal places

origi-Replace any damaged parts with new parts

• When installing hoses and wires, be surethat they will not be damaged by contactwith other parts when the machine is beingoperated

20.When installing high pressure hoses, make surethat they are not twisted Damaged tubes aredangerous, so be extremely careful when install-ing tubes for high pressure circuits Also, checkthat connecting parts are correctly installed.21.When assembling or installing parts, always usethe specified tightening torques When installingprotective parts such as guards, or parts whichvibrate violently or rotate at high speed, be par-ticularly careful to check that they are installedcorrectly

22.When aligning two holes, never insert your gers or hand Be careful not to get your fingerscaught in a hole

fin-23.When measuring hydraulic pressure, check thatthe measuring tool is correctly assembled beforetaking any measurements

24.Take care when removing or installing the tracks

of track-type machines

When removing the track, the track separatessuddenly, so never let anyone stand at eitherend of the track

This shop manual mainly contains the necessary technical information for operations performed in a serviceworkshop For ease of understanding, the manual is divided into the following chapters; these chapters are fur-ther divided into the each main group of components.

STRUCTURE AND FUNCTION

This section explains the structure and function of each component It serves not only to give an standing of the structure, but also serves as reference material for troubleshooting

under-In addition, this section may contain hydraulic circuit diagrams, electric circuit diagrams, and nance standards

mainte-TESTING AND ADJUSTING

This section explains checks to be made before and after performing repairs, as well as adjustments to

be made at completion of the checks and repairs

Troubleshooting charts correlating "Problems" with "Causes" are also included in this section

DISASSEMBLY AND ASSEMBLY

This section explains the procedures for removing, installing, disassembling and assembling each ponent, as well as precautions for them

com-MAINTENANCE STANDARD

This section gives the judgment standards for inspection of disassembled parts

The contents of this section may be described in STRUCTURE AND FUNCTION

OTHERS

This section mainly gives hydraulic circuit diagrams and electric circuit diagrams

In addition, this section may give the specifications of attachments and options together

NOTICE

The specifications contained in this shop manual are subject to change at any time and without anyadvance notice Use the specifications given in the book with the latest date

HOW TO READ THE SHOP MANUAL

VOLUMES

Shop manuals are issued as a guide to carrying out

repairs They are divided as follows:

Chassis volume: Issued for every machine model

Engine volume: Issued for each engine series

Electrical volume:

Attachments volume:

These various volumes are designed to avoid

dupli-cating the same information Therefore, to deal with

all repairs for any model , it is necessary that

chas-sis, engine, electrical and attachment volumes be

available

DISTRIBUTION AND UPDATING

Any additions, amendments or other changes will be

sent to KOMATSU distributors Get the most

up-to-date information before you start any work

FILING METHOD

1 See the page number on the bottom of the page

File the pages in correct order

2 Following examples show how to read the page

Consecutive page number for eachitem

3 Additional pages: Additional pages are indicated

by a hyphen (-) and number after the page

REVISED EDITION MARK

W he n a ma n ua l i s re v is e d , a n ed i ti o n ma rk((1)(2)(3) ) is recorded on the bottom of the pages

Special safety precautionsare necessary when per-forming the work

Special technical tions or other precautionsfor preserving standardsare necessary when per-forming the work

Weight of parts of tems Caution necessarywhen selecting hoistingwire, or when working pos-ture is important, etc

torque

Places that require specialattention for the tighteningtorque during assembly

Places to be coated withadhesives and lubricants,etc

Places where oil, water orfuel must be added, andthe capacity

Places where oil or water

m u s t b e d r a i n e d , a n dquantity to be drained

}·

Each issued as onevolume to cover allmodels

HOISTING INSTRUCTIONS

HOISTING

k Heavy parts (25 kg or more) must be lifted

with a hoist, etc In the DISASSEMBLY

AND ASSEMBLY section, every part

weighing 25 kg or more is indicated clearly

with the symbol

• If a part cannot be smoothly removed from the

machine by hoisting, the following checks

should be made:

1) Check for removal of all bolts fastening the

part to the relative parts

2) Check for existence of another part causing

interference with the part to be removed

WIRE ROPES

1) Use adequate ropes depending on the

weight of parts to be hoisted, referring to

the table below:

Wire ropes(Standard "Z" or "S" twist ropes

without galvanizing)

! The allowable load value is estimated to be

one-sixth or one-seventh of the breaking strength of

the rope used

2) Sling wire ropes from the middle portion of the

k Slinging with one rope may cause turning

of the load during hoisting, untwisting ofthe rope, or slipping of the rope from itsoriginal winding position on the load, whichcan result in a dangerous accident

4) Do not sling a heavy load with ropes forming awide hanging angle from the hook

When hoisting a load with two or more ropes,the force subjected to each rope will increasewith the hanging angles The table belowshows the variation of allowable load kN {kg}when hoisting is made with two ropes, each ofwhich is allowed to sling up to 9.8 kN {1000 kg}vertically, at various hanging angles

When two ropes sling a load vertically, up to19.6 kN {2000 kg} of total weight can be sus-pended This weight becomes 9.8 kN {1000 kg}when two ropes make a 120° hanging angle

On the other hand, two ropes are subjected to

an excessive force as large as 39.2 kN {4000kg} if they sling a 19.6 kN {2000 kg} load at alifting angle of 150°

1.01.41.62.22.83.64.45.610.018.028.040.0

4

SAD00479 41% 71%

79%

88%

100%

METHOD OF DISASSEMBLING, CONNECTING PUSH-PULL TYPE COUPLER

kBefore carrying out the following work, release

the residual pressure from the hydraulic tank

For details, see TESTING AND ADJUSTING,

Releasing residual pressure from hydraulic

tank

kEven if the residual pressure is released from

the hydraulic tank, some hydraulic oil flows out

when the hose is disconnected Accordingly,

prepare an oil receiving container

Disconnection

1) Release the residual pressure from the

hydrau-lic tan k For details, see TESTING AND

ADJUSTING, Releasing residual pressure from

hydraulic tank

2) Hold adapter (1) and push hose joint (2) into

mating adapter (3) (See Fig 1)

! The adapter can be pushed in about 3.5

mm

! Do not hold rubber cap portion (4)

3) After hose joint (2) is pushed into adapter (3),

press rubber cap portion (4) against (3) until it

clicks (See Fig 2)

4) Hold hose adapter (1) or hose (5) and pull it out

(See Fig 3)

! Since some hydraulic oil flows out, prepare

an oil receiving container

Connection

1) Hold hose adapter (1) or hose (5) and insert it in

mating adapter (3), aligning them with each

other (See Fig 4)

! Do not hold rubber cap portion (4)

2) After inserting the hose in the mating adapter

perfectly, pull it back to check its connecting

condition (See Fig 5)

! When the hose is pulled back, the rubber

cap portion moves toward the hose about

3.5 mm This does not indicate abnormality,

however

Type 1

1) Hold the mouthpiece of the tightening portion

and push body (2) in straight until sliding

pre-vention ring (1) contacts contact surface a of

the hexagonal portion at the male end

2) Hold in the condition in Step 1), and turn

lever (4) to the right (clockwise)

3) Hold in the condition in Steps 1) and 2), and

pull out whole body (2) to disconnect it

1) Hold the mouthpiece of the tightening portionand push body (2) in straight until sliding pre-

vention ring (1) contacts contact surface a of

the hexagonal portion at the male end

2) Hold in the condition in Step 1), and push

until cover (3) contacts contact surface a of

the hexagonal portion at the male end

3) Hold in the condition in Steps 1) and 2), andpull out whole body (2) to disconnect it

• Hold the mouthpiece of the tightening portion

and push body (2) in straight until sliding

pre-vention ring (1) contacts contact surface a of

the hexagonal portion at the male end to

con-nect it

• Hold the mouthpiece of the tightening portionand push body (2) in straight until sliding pre-

vention ring (1) contacts contact surface a of

the hexagonal portion at the male end to nect it

con-COATING MATERIALS

! The recommended coating materials such as adhesives, gasket sealants and greases used for disassemblyand assembly are listed below

! For coating materials not listed below, use the equivalent of products shown in this list

Adhesives

cushions, and cock plug from coming out

(2 pcs.)

Polyethylene container

• Used in places requiring an immediately effective, strong adhesive

Used for plastics (except polyethylene, polyprophylene, tetrafluoroethlene and vinyl chloride), rubber, metal and non-metal

container

• Features:

Resistance to heat and chemicals

• Used for anti-loosening and sealant purpose for bolts and plugs

LT-3

790-129-9060(Set of adhesive and hardening agent)

Adhesive:

1 kgHardening agent:

• Quick hardening type adhesive

• Cure time: within 5 sec to 3 min

• Used mainly for adhesion of metals, rubbers, plastics and woods

Aron-alpha

Polyethylene container

• Quick hardening type adhesive

• Quick cure type (max strength after 30 minutes)

• Used mainly for adhesion of rubbers, plastics and metals

Loctite

Polyethylene container

• Resistance to heat, chemicals

• Used at joint portions subject to high temperatures

Gasket

sealant

and packing of power train case, etc

• Used as sealant for flange surface, tread

• Used as sealant for oil pan, final drive case, etc

Molybdenum

disulphide

lubricant

prevent from squeaking)

• General purpose type

G2-CA

SYG2-400CASYG2-350CASYG2-400CA-ASYG2-160CASYGA-160CNCA

• Used for normal temperature, light load bearing at places in contact with water or steam

400 g × 10

400 g × 20

16 kg

Bellows typeBellows typeCan

• Used for heavy load portion

400 g

16 kg

Bellows typeCan

• Seizure resistance and heat resistance higher than molybdenum disulfide grease

• Since this grease is white, it does not stand out against machine body

400 g

16 kg

Bellows typeCan

• Since this grease is decomposed by bacteria in short period, it has less effects

on microorganisms, animals, and plants

• Used as adhesive for glass

(Using limit: 6 months)

(Using limit: 4 months)Sika Japan,

Polyethylene container

• Used as adhesive for glass

(Using limit: 6 months)

• Used to seal front window

(Using limit: 6 months)

(Using limit: 12 months)

STANDARD TIGHTENING TORQUE

STANDARD TIGHTENING TORQUE TABLE (WHEN USING TORQUE WRENCH)

! In the case of metric nuts and bolts for which there is no special instruction, tighten to the torque given inthe table below

TABLE OF TIGHTENING TORQUES FOR FLARED NUTS

! In the case of flared nuts for which there is no

special instruction, tighten to the torque given in

the table below

Thread diameter

of bolt

Width across flats

6 – 7.5

10 – 12.515.5 – 19.5

5.9 – 9.813.7 – 23.534.3 – 46.174.5 – 90.2

0.6 – 1.01.4 – 2.43.5 – 4.77.6 – 9.2

SAD00483 Sealing surface

TABLE OF TIGHTENING TORQUES FOR SPLIT FLANGE BOLTS

! In the case of split flange bolts for which there is no special instruction, tighten to the torque given in thetable below

TABLE OF TIGHTENING TORQUES FOR O-RING BOSS PIPING JOINTS

! Unless there are special instructions, tighten the O-ring boss piping joints to the torque below

TABLE OF TIGHTENING TORQUES FOR O-RING BOSS PLUGS

! Unless there are special instructions, tighten the O-ring boss plugs to the torque below

Varies depending

on type of connector

141719222427303232

—36

TIGHTENING TORQUE FOR 102 AND 114 ENGINE SERIES

1) BOLT AND NUTS

Use these torques for bolts and nuts (unit: mm) of Cummins Engine

2) EYE JOINTS

Use these torques for eye joints (unit: mm) of Cummins Engine

3) TAPERED SCREWS

Use these torques for tapered screws (unit: inch) of Cummins Engine

TIGHTENING TORQUE TABLE FOR HOSES (TAPER SEAL TYPE AND FACE SEAL TYPE)

! Tighten the hoses (taper seal type and face seal type) to the following torque, unless otherwise specified

! Apply the following torque when the threads are coated (wet) with engine oil

681012

68101214

Nominal size

of hose

Width across

flats

Tightening torque (Nm {kgm}) Taper seal type Face seal type

(mm)

Nominal thread size - Threads per inch, Thread series

Root diameter (mm) (Reference)

11

—16

13

ELECTRIC WIRE CODE

In the wiring diagrams, various colors and symbols are employed to indicate the thickness of wires

This wire code table will help you understand WIRING DIAGRAMS

Example: 5WB indicates a cable having a nominal number 5 and white coating with black stripe

Number of

strands

Dia of strands(mm2)

Cross section(mm2)

CONVERSION TABLE

METHOD OF USING THE CONVERSION TABLE

The Conversion Table in this section is provided to enable simple conversion of figures For details of themethod of using the Conversion Table, see the example given below

EXAMPLE

• Method of using the Conversion Table to convert from millimeters to inches

1 Convert 55 mm into inches

(1) Locate the number 50 in the vertical column at the left side, take this as (A), then draw a horizontal linefrom (A)

(2) Locate the number 5 in the row across the top, take this as (B), then draw a perpendicular line downfrom (B)

(3) Take the point where the two lines cross as (C) This point (C) gives the value when converting frommillimeters to inches Therefore, 55 mm = 2.165 inches

2 Convert 550 mm into inches

(1) The number 550 does not appear in the table, so divide by 10 (move the decimal point one place to theleft) to convert it to 55 mm

(2) Carry out the same procedure as above to convert 55 mm to 2.165 inches

(3) The original value (550 mm) was divided by 10, so multiply 2.165 inches by 10 (move the decimal pointone place to the right) to return to the original value This gives 550 mm = 21.65 inches

0.0390.4330.8271.2201.6142.0082.4022.7953.1893.583

0.0790.4720.8661.2601.6542.0472.4412.8353.2283.622

0.1180.5120.9061.2991.6932.0872.4802.8743.2683.661

0.1570.5510.9451.3391.7322.1262.5202.9133.3073.701

0.1970.5910.9841.3781.7722.1652.5592.9533.3463.740

0.2360.6301.0241.4171.8112.2052.5982.9923.3863.780

0.2760.6691.0631.4571.8502.2442.6383.0323.4253.819

0.3150.7091.1021.4961.8902.2832.6773.0713.4653.858

0.3540.7481.1421.5361.9292.3232.7173.1103.5043.898(A)

(B)

(C)

0.0390.4330.8271.2201.614

2.0082.4022.7953.1893.583

0.0790.4720.8661.2601.654

2.0472.4412.8353.2283.622

0.1180.5120.9061.2991.693

2.0872.4802.8743.2683.661

0.1570.5510.9451.3391.732

2.1262.5202.9133.3073.701

0.1970.5910.9841.3781.772

2.1652.5592.9533.3463.740

0.2360.6301.0241.4171.811

2.2052.5982.9923.3863.780

0.2760.6691.0631.4571.850

2.2442.6383.0323.4253.819

0.3150.7091.1021.4961.890

2.2832.6773.0713.4653.858

0.3540.7481.1421.5361.929

2.3232.7173.1103.5043.898

112.44134.48156.53178.57200.62

4.4126.4648.5070.5592.59

114.64136.69158.73180.78202.83

6.6128.6650.7172.7594.80

116.85138.89160.94182.98205.03

8.8230.8651.9174.9697.00

119.05141.10163.14185.19207.24

11.0233.0755.1277.1699.21

121.25143.30165.35187.39209.44

13.23 35.27 57.32 79.37101.41

123.46145.51167.55189.60211.64

15.43 37.48 59.53 81.57103.62

125.66147.71169.76191.80213.85

17.64 39.68 61.73 83.78105.82

127.87149.91171.96194.01216.05

19.84 41.89 63.93 85.98108.03

130.07152.12174.17196.21218.26

Liter to U.S Gallon

13.20915.85018.49221.13423.775

0.264 2.906 5.548 8.18910.831

13.47316.11518.75621.39824.040

0.528 3.170 5.812 8.45411.095

13.73716.37919.02021.66224.304

0.793 3.434 6.076 8.71811.359

14.00116.64319.28521.92624.568

1.057 3.698 6.340 8.98211.624

14.26516.90719.54922.19024.832

1.321 3.963 6.604 9.24611.888

14.52917.17119.81322.45525.096

1.585 4.227 6.869 9.51012.152

14.79517.43520.07722.71925.361

1.849 4.491 7.133 9.77412.416

15.05817.70020.34122.98325.625

2.113 4.755 7.39710.03912.680

15.32217.96420.60523.24725.889

2.378 5.019 7.66110.30312.944

15.58618.22820.87023.51126.153

10.99813.19815.39817.59819.797

0.220 2.420 4.619 6.819 9.019

11.28113.41815.61817.81820.017

0.440 2.640 4.839 7.039 9.239

11.43813.63815.83818.03720.237

0.660 2.860 5.059 7.259 9.459

11.65813.85816.05818.25720.457

0.880 3.080 5.279 7.479 9.679

11.87814.07816.27818.47720.677

1.100 3.300 5.499 7.969 9.899

12.09814.29816.49818.69720.897

1.320 3.520 5.719 7.91910.119

12.31814.51816.71818.91721.117

1.540 3.740 5.939 8.13910.339

12.52814.73816.93819.13721.337

1.760 3.950 6.159 8.35910.559

12.75814.95817.15819.35721.557

1.980 4.179 6.379 8.57910.778

12.97815.17817.37819.57721.777

723.3795.6868.0940.31012.6

1084.91157.31129.61301.91374.3

7.2 79.6151.9224.2296.6

368.9441.2513.5585.9658.2

730.5802.9875.2947.51019.9

1092.21164.51236.81309.21381.5

14.5 86.8159.1231.5303.8

376.1448.5520.8593.1665.4

737.8810.1882.4954.81027.1

1099.41171.71244.11316.41388.7

21.7 94.0166.4238.7311.0

383.4455.7528.0600.3672.7

745.0817.3889.7962.01034.3

1106.61179.01251.31323.61396.0

28.9101.3173.6245.9318.3

390.6462.9535.2607.6679.9

752.2824.6896.9969.21041.5

1113.91186.21258.51330.91403.2

36.2108.5180.8253.2325.5

397.8470.2542.5614.8687.1

759.5831.8904.1976.51048.8

1121.11193.41265.81338.11410.4

43.4115.7188.1260.4332.7

405.1477.4549.7622.0694.4

766.7839.0911.4983.71056.0

1128.31200.71273.01345.31417.7

50.6123.0195.3267.6340.0

412.3484.6556.9629.3701.6

773.9846.3918.6990.91063.2

1135.61207.91280.11352.61424.9

57.9130.2202.5274.9347.2

419.5491.8564.2636.5708.8

781.2853.5925.8998.21070.5

1142.81215.11287.51359.81432.1

65.1137.4209.8282.1354.4

426.8499.1571.4643.7716.1

788.4860.7933.11005.41077.7

1150.01222.41294.71367.01439.4

21342276241825602702

28452987312932713414

14.2 156.5 298.7 440.9 583.2

725.4 867.6101011521294

14371579172118632005

21482290243225742717

28593001314332863428

28.4 170.7 312.9 455.1 597.4

739.6 881.8102411661309

14511593173518772020

21622304244625892731

28733015315833003442

42.7 184.9 327.1 469.4 611.6

753.8 896.1103811811323

14651607174918922034

21762318246026032745

28873030317233143456

56.9 199.1 341.4 483.6 625.8

768.1 910.3105311951337

14791621176419062048

21902333247526172759

29013044318633283470

71.1 213.4 355.6 497.8 640.1

782.3 924.5106712091351

14931636177819202062

22052347248926312773

29163058320033433485

85.3 227.6 369.8 512.0 654.3

796.5 938.7108112231365

15081650179219342077

22192361250326462788

29303072321433573499

99.6 241.8 384.0 526.3 668.5

810.7 953.0109512371380

15221664180619492091

22332375251826602802

29443086322933713513

113.8 256.0 398.3 540.5 682.7

825.0 967.2110912521394

15361678182119632105

22472389253226742816

29583101324333853527

128.0 270.2 412.5 554.7 696.9

839.2 981.4112412661408

15501693183519772119

22622404254626882830

29733115325733993542

Temperature

Fahrenheit-Centigrade Conversion ; a simple way to convert a Fahrenheit temperature reading into a tigrade temperature reading or vice versa is to enter the accompanying table in the center or boldface col-umn of figures

Cen-These figures refer to the temperature in either Fahrenheit or Centigrade degrees

If it is desired to convert from Fahrenheit to Centigrade degrees, consider the center column as a table ofFahrenheit temperatures and read the corresponding Centigrade temperature in the column at the left

If it is desired to convert from Centigrade to Fahrenheit degrees, consider the center column as a table ofCentigrade values, and read the corresponding Fahrenheit temperature on the right

–11.7–11.1–10.6–10.0 –9.4 –8.9 –8.3 –7.8 –7.2 –6.7 –6.1 –5.6 –5.0 –4.4 –3.9 –3.3 –2.8 –2.2 –1.7 –1.1 –0.6 0 0.6 1.1 1.7 2.2 2.8 3.3 3.9 4.4 5.0 5.6 6.1 6.7 7.2

11 12 13 14 15

16 17 18 19 20

21 22 23 24 25

26 27 28 29 30

31 32 33 34 35

36 37 38 39 40

41 42 43 44 45

51.8 53.6 55.4 57.2 59.0 60.8 62.6 64.4 66.2 68.0 69.8 71.6 73.4 75.2 77.0 78.8 80.6 82.4 84.2 86.0 87.8 89.6 91.4 93.2 95.0 96.8 98.6100.4102.2104.0105.8107.6109.4111.2113.0

7.8 8.3 8.9 9.410.010.611.111.712.212.813.313.914.415.015.616.116.717.217.818.318.919.420.020.621.121.722.222.823.323.924.425.025.626.126.7

46 47 48 49 50

51 52 53 54 55

56 57 58 59 0

61 62 63 64 65

66 67 68 69 70

71 72 73 74 75

76 77 78 79 80

114.8116.6118.4120.2122.0123.8125.6127.4129.2131.0132.8134.6136.4138.2140.0141.8143.6145.4147.2149.0150.8152.6154.4156.2158.0159.8161.6163.4165.2167.0168.8170.6172.4174.2176.0

27.227.828.328.929.4

30.030.631.131.732.2

32.833.333.934.435.0

35.636.136.737.237.8

40.643.346.148.951.7

54.457.260.062.765.6

68.371.173.976.779.4

81 82 83 84 85

86 87 88 89 90

91 92 93 94 95

96 97 98 99 100

105 110 115 120 125

130 135 140 145 150

155 160 165 170 175

117.8179.6181.4183.2185.0186.8188.6190.4192.2194.0195.8197.6199.4201.2203.0204.8206.6208.4210.2212.0221.0230.0239.0248.0257.0266.0275.0284.0293.0302.0311.0320.0329.0338.0347.0

In this manual, the measuring units are indicated with Internatinal System of units (SI)

As for reference, conventionally used Gravitational System of units are indicated in parentheses { }

Specifiaction dimensions drawing 01- 2Working range drawing 01- 4Specifications 01- 6Weight table 01-18List of lubricants and coolant 01-22

PC78US-6

SPECIFICATION DIMENSIONS DRAWING

PC78US-6

*1 Serial No.: 4001 – 5500

*2 Serial No.: 5501 and up

Steel shoe spec Road liner spec Rubber shoe spec

G Distance between tumbler

PC78US-6 01-3

PC78UU-6

*1 Serial No.: 22832 – 23500

*2 Serial No.: 23501 and up

Road liner spec Rubber shoe spec Steel shoe spec

G Distance between tumbler

WORKING RANGE DRAWING

F Min swing radius of work

01-6 PC78US-6

SPECIFICATIONS

PC78US-6

Figures (steel shoe specification) are common to the all specifications unless otherwise specified

( ) Figures in ( ): Road liner specification

[ ] Figures in [ ]: Rubber shoe specification

Blade-less specification Blade specification

Max digging depth

Max vertical wall depth

Max digging reach

Max reach at ground level

Max digging height

Max dumping height

Max blade lifting height

Max blade lowering depth

mmmmmmmmmmmmmmmm

4,1003,6106,3806,2407,3005,180––

4,1003,6106,3806,2407,3005,180380245Max digging force (Bucket)

Continuous swing speed

Max slope angle for swing

Travel speed (Low/High)

Gradeability

Ground pressure

kN {kg}

rpmdeg

km/hdeg

kPa {kg/cm2}

61.29 {6,250}

10.020.03.0/4.5 [3.2/4.8]

3530.4 {0.31}

61.29 {6,250}

10.019.03.0/4.5 [3.2/4.8]3532.4 {0.33}

Height of work equipment at min swing

PC78US-6Blade-less specification Blade specification

3532.4 {0.33}

01-8 PC78US-6

*1: Battery capacity (Ah) shows the rate of 5 hours

*2: Blade-less specification

*3: Blade specification

Blade-less specification Blade specification

{kgm/rpm}

226/1,500 {23.0/1,500}

24 V, 25 AAlternator

Track shoe (Steel shoe)

(Road liner)(Rubber shoe)

Assembly-type triple grouser, 39 on each sideAssembly-type road liner, 39 on each side

Unit-type rubber crawler

*2 (Work equipment, swing, travel)

*3 (Work equipment, travel)

*3 (Swing, blade)

(Control)

MPa {kg/cm2}

26.5 {270}

––3.1 {32}

–26.5 {270}

Travel motor Variable-capacity piston motor(with brake valve, parking brake) × 2

Swing motor Fixed-capacity piston motor(with safety valve, pivot shaft brake) × 1

(13)

PC78US-6 PC78US-6Blade-less specification Blade specification Blade-less specification Blade specification

4-cycle, water-cooled, in-line vertical type,

direct injection, with turbocharger

4-cycle, water-cooled, in-line vertical type,direct injection, with turbocharger

40.5/1,850 {54.0/1,850}

40.5/1,850 {54.0/1,850}

237/1,500 {24.2/1,500}

237/1,500 {24.2/1,500}

Assembly-type triple grouser, 39 on each side

Assembly-type road liner, 39 on each side

Unit-type rubber crawler

Assembly-type triple grouser, 39 on each sideAssembly-type road liner, 39 on each side

Unit-type rubber crawlerVariable-capacity piston pump

80× 2+12.7

Gear pump × 280× 2+60+12.7

Gear pump × 1 80× 2+12.7

Gear pump × 280× 2+60+12.7

21.1 {215}

3.1 {32}

26.5 {270}

––3.1 {32}

–26.5 {270}

21.1 {215}

3.1 {32}

Hydraulically assisted Hydraulically assisted Hydraulically assisted Hydraulically assisted

Variable-capacity piston motor

(with brake valve, parking brake) × 2

Variable-capacity piston motor(with brake valve, parking brake) × 2

Fixed-capacity piston motor

(with safety valve, pivot shaft brake) × 1

Fixed-capacity piston motor(with safety valve, pivot shaft brake) × 1

01-10 PC78US-6

Blade-less specification Blade specification

PC78US-6Blade-less specification Blade specification

5501 and upReciprocating piston Reciprocating piston

01-12 PC78US-6

PC78UU-6

Figures (Road liner specification) are common to the all specifications unless otherwise specified

( ) Figures in ( ): Rubber shoe specification

[ ] Figures in [ ]: Steel shoe specification

Max digging depth

Max vertical wall depth

Max digging reach

Max reach at ground level

Max digging height

Max dumping height

Boom offset

(left side/right sede)

Max blade lifting height

Max blade lowering depth

mmmmmmmmmmmmmm

mmmm

4,2003,1606,4006,2407,3605,2901,030/1,065

415210Max digging force (Bucket)

Continuous swing speed

Max slope angle for swing

Travel speed (Low/High)

Gradeability

Ground pressure

kN {kg}

rpmdeg

km/hdeg

kPa {kg/cm2}

61.3 {6,250}

10.013.03.0/4.5 (3.2/4.8)3534.3 {0.35}

Min swing radius of work equipment

Height of work equipment at min swing