SEBM034102
MACHINE MODEL
SERIAL NUMBER
BR380JG-1
1001 and up
This shop manual may contain attachments and optional equipment that are not available in your area. Please consult your local Komatsu distributor for those items you may require. Materials and specifications are subject to change without notice.
BR380JG-1 mounts the SAA6D102E-2 engine. For details of the engine, see the 102 Series Engine Shop Manual.
© 2004 All Rights Reserved Printed in Japan 06-04(01)
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CONTENTS No. of page
01 GENERAL ............................................................................................................................ 01-1 10 STRUCTURE, FUNCTION AND MAINTENANCE STANDARD............................................ 10-1 20 TESTING AND ADJUSTING ........................................................................ 20-1 30 DISASSEMBLY AND ASSEMBLY ..................................................... 30-1 90 OTHERS ................................................................................................................................ 90-1
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BR380JG-1
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SAFETY
SAFETY NOTICE
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 dangerous 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 carefully 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 keep tools and removed parts. Always keep the tools and parts in their correct places. Always keep the work area clean and make sure that there is no dirt or oil on the floor. Smoke only in the areas provided for smoking. Never smoke while working. PREPARATIONS FOR WORK 7. Before adding oil or making any repairs, park the machine on hard, level ground, and block the wheels or tracks to prevent the machine from moving. 8. Before starting work, lower blade, ripper, bucket or any other work equipment to the ground. If this is not possible, insert the safety pin or use blocks to prevent the work equipment from falling. In addition, be sure to lock all the control levers and hang warning signs on them. 9. When disassembling or assembling, support the machine with blocks, jacks or stands before starting work. 10.Remove all mud and oil from the steps or other places used to get on and off the machine. Always use the handrails, ladders or steps when getting on or off the machine. Never jump on or off the machine. If it is impossible to use the handrails, ladders or steps, use a stand to provide safe footing.
00-3
SAFETY 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 carrying 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 negative ( ) 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 prevent 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 gasoline when washing electrical parts.
00-4
SAFETY NOTICE 19.Be sure to assemble all parts again in their original places. Replace any damaged parts with new parts. When installing hoses and wires, be sure that they will not be damaged by contact with other parts when the machine is being operated. 20.When installing high pressure hoses, make sure that they are not twisted. Damaged tubes are dangerous, so be extremely careful when installing tubes for high pressure circuits. Also, check that connecting parts are correctly installed. 21.When assembling or installing parts, always use the specified tightening torques. When installing protective parts such as guards, or parts which vibrate violently or rotate at high speed, be particularly careful to check that they are installed correctly. 22.When aligning two holes, never insert your fingers or hand. Be careful not to get your fingers caught in a hole. 23.When measuring hydraulic pressure, check that the measuring tool is correctly assembled before taking any measurements. 24.Take care when removing or installing the tracks of track-type machines. When removing the track, the track separates suddenly, so never let anyone stand at either end of the track.
FOREWORD
GENERAL
FOREWORD
GENERAL
This shop manual has been prepared as an aid to improve the quality of repairs by giving the serviceman an accurate understanding of the product and by showing him the correct way to perform repairs and make judgements. Make sure you understand the contents of this manual and use it to full effect at every opportunity.
This shop manual mainly contains the necessary technical information for operations performed in a service workshop. For ease of understanding, the manual is divided into the following chapters; these chapters are further 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 understanding of the structure, but also serves as reference material for troubleshooting. In addition, this section may contain hydraulic circuit diagrams, electric circuit diagrams, and maintenance standards. 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 component, as well as precautions for them. 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 any advance notice. Use the specifications given in the book with the latest date.
00-5
FOREWORD
HOW TO READ THE SHOP MANUAL
HOW TO READ THE SHOP MANUAL
REVISED EDITION MARK
VOLUMES Shop manuals are issued as a guide to carrying out repairs. They are divided as follows:
When a man ual is re vised , a n e dition ma rk ((1)(2)(3)....) is recorded on the bottom of the pages.
Chassis volume: Issued for every machine model Engine volume: Issued for each engine series Each issued as one Electrical volume: Attachments volume: · volume to cover all models
REVISIONS
These various volumes are designed to avoid duplicating the same information. Therefore, to deal with all repairs for any model , it is necessary that chassis, 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-todate 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 number. Example 1 (Chassis volume): 10 - 3 Item number (10. Structure and Function) Consecutive page number for each item. Example 2 (Engine volume): 12 - 5 Unit number (1. Engine) Item number (2. Testing and Adjusting) Consecutive page number for each item. 3. Additional pages: Additional pages are indicated by a hyphen (-) and number after the page number. File as in the example. Example: 12-203 10-4 12-203-1 10-4-1 Added pages 12-203-2 10-4-2 12-204 10-5
00-6
Revised pages are shown in the LIST OF REVISED PAGES next to the CONTENTS page. SYMBOLS So that the shop manual can be of ample practical use, important safety and quality portions are marked with the following symbols.
Symbol
Item
Remarks
k
Safety
Special safety precautions are necessary when performing the work.
Caution
Special technical precautions or other precautions for preserving standards are necessary when performing the work.
4
Weight
Weight of parts of systems. Caution necessary when selecting hoisting wire, or when working posture is important, etc.
3
Tightening torque
Places that require special attention for the tightening torque during assembly.
2
Coat
Places to be coated with adhesives and lubricants, etc.
5
Oil, water
Places where oil, water or fuel must be added, and the capacity.
6
Drain
Places where oil or water mu st b e d r ai n ed , a n d quantity to be drained.
a
FOREWORD
HOISTING INSTRUCTIONS
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 4
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) Rope diameter
Allowable load
mm
kN
tons
10 11.5 12.5 14 16 18 20 22.4 30 40 50 60
9.8 13.7 15.7 21.6 27.5 35.3 43.1 54.9 98.1 176.5 274.6 392.2
1.0 1.4 1.6 2.2 2.8 3.6 4.4 5.6 10.0 18.0 28.0 40.0
Slinging near the edge of the hook may cause the rope to slip off the hook during hoisting, and a serious accident can result. Hooks have maximum strength at the middle portion.
3) Do not sling a heavy load with one rope alone, but sling with two or more ropes symmetrically wound onto the load. k Slinging with one rope may cause turning of the load during hoisting, untwisting of the rope, or slipping of the rope from its original winding position on the load, which can result in a dangerous accident. 4) Do not sling a heavy load with ropes forming a wide hanging angle from the hook. When hoisting a load with two or more ropes, the force subjected to each rope will increase with the hanging angles. The table below shows the variation of allowable load kN {kg} when hoisting is made with two ropes, each of which is allowed to sling up to 9.8 kN {1000 kg} vertically, at various hanging angles. When two ropes sling a load vertically, up to 19.6 kN {2000 kg} of total weight can be suspended. 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 {4000 kg} if they sling a 19.6 kN {2000 kg} load at a lifting angle of 150°.
The allowable load value is estimated to be onesixth or one-seventh of the breaking strength of the rope used. 2) Sling wire ropes from the middle portion of the hook.
00-7
FOREWORD
METHOD OF DISASSEMBLING, CONNECTING PUSH-PULL TYPE COUPLER
METHOD OF DISASSEMBLING, CONNECTING PUSH-PULL TYPE COUPLER
k Before 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. k Even 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 hydraulic tan k. For details, see T ESTI NG 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.
00-8
Type 1
FOREWORD
METHOD OF DISASSEMBLING, CONNECTING PUSH-PULL TYPE COUPLER
Type 3
1) Hold the mouthpiece of the tightening portion and push body (2) in straight until sliding prevention ring (1) contacts contact surface a of the hexagonal portion at the male end.
1) Hold the mouthpiece of the tightening portion and push body (2) in straight until sliding prevention 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).
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), and pull out whole body (2) to disconnect it.
3) Hold in the condition in Steps 1) and 2), and pull out whole body (2) to disconnect it.
Disassembly
Type 2
Hold the mouthpiece of the tightening portion and push body (2) in straight until sliding prevention ring (1) contacts contact surface a of the hexagonal portion at the male end to connect it.
Connection
Hold the mouthpiece of the tightening portion and push body (2) in straight until sliding prevention ring (1) contacts contact surface a of the hexagonal portion at the male end to connect it.
00-9
FOREWORD
COATING MATERIALS
COATING MATERIALS The recommended coating materials such as adhesives, gasket sealants and greases used for disassembly and assembly are listed below. For coating materials not listed below, use the equivalent of products shown in this list. Category
Komatsu code
Part No.
Q'ty
Container
Main applications, featuresr
LT-1A
790-129-9030
150 g
Tube
Used to prevent rubber gaskets, rubber cushions, and cock plug from coming out.
LT-1B
790-129-9050
20 g (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.
LT-2
09940-00030
50 g
Polyethylene 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 kg Hardening agent: 500 g
Can
LT-4
790-129-9040
250 g
Polyethylene container
Holtz MH 705
790-126-9120
75 g
Tube
Used as heat-resisting sealant for repairing engine.
Three bond 1735
790-129-9140
50 g
Polyethylene container
Quick hardening type adhesive Cure time: within 5 sec. to 3 min. Used mainly for adhesion of metals, rubbers, plastics and woods. Quick hardening type adhesive Quick cure type (max. strength after 30 minutes) Used mainly for adhesion of rubbers, plastics and metals.
Adhesives
Used as sealant for machined holes.
Aron-alpha 201
790-129-9130
2g
Polyethylene container
Loctite 648-50
79A-129-9110
50 cc
Polyethylene container
Resistance to heat, chemicals Used at joint portions subject to high temperatures.
LG-1
790-129-9010
200 g
Tube
Used as adhesive or sealant for gaskets and packing of power train case, etc.
LG-5
790-129-9080
1 kg
Can
Used as sealant for various threads, pipe joints, flanges. Used as sealant for tapered plugs, elbows, nipples of hydraulic piping.
Tube
Features: Silicon based, resistance to heat, cold Used as sealant for flange surface, tread. Used as sealant for oil pan, final drive case, etc.
LG-6
790-129-9020
200 g
Gasket sealant LG-7
790-129-9070
1g
Tube
Features: Silicon based, quick hardening type Used as sealant for flywheel housing, intake manifold, oil an, thermostat housing, etc.
Three bond 1211
790-129-9090
100 g
Tube
Used as heat-resisting sealant for repairing engine.
Tube
Features: Silicone type, heat resistant, vibration resistant, and impact resistant sealing material Used as sealing material for transfer case
Three bond 1207B
00-10
Used as adhesive or sealant for metal, glass and plastic.
419-15-18131
100 g
FOREWORD
Molybdenum disulphide lubricant
Grease
Primer
Adhesive
Caulking material
Komatsu code
Part No.
Q'ty
Container
Main applications, featuresr
LM-G
09940-00051
60 g
Can
Used as lubricant for sliding portion (to prevent from squeaking).
Tube
Used to prevent seizure or scuffling of the thread when press fitting or shrink fitting. Used as lubricant for linkage, bearings, etc.
LM-P
09940-00040
G2-LI
SYG2-400LI SYG2-350LI SYG2-400LI-A SYG2-160LI SYGA-160CNLI
G2-CA
SYG2-400CA SYG2-350CA SYG2-400CA-A SYG2-160CA SYGA-160CNCA
Molybdenum disulphide grease LM-G (G2-M)
SYG2-400M SYG2-400M-A SYGA-16CNM
Hyper White Grease G2-T G0-T (*) *: For use in cold district
SYG2-400T-A SYG2-16CNT SYG0-400T-A (*) SYG0-16CNT (*)
Biogrease G2B G2-BT (*) *: For high temperature and large load
SYG2-400B SYGA-16CNB SYG2-400BT (*) SYGA-16CNBT (*)
200 g
General purpose type Various
Various
Various
Various
400 g × 10 Bellows type 400 g × 20 Bellows type 16 kg Can
400 g 16 kg
400 g 16 kg
Since this grease is decomposed by bacteria in short period, it has Bellows type less effects on microorganisms, Can animals, and plants.
20 ml
Glass container
SUNSTAR GLASS PRIMER 580 SUPER
20 ml
Glass container
SUNSTAR PENGUINE SEAL 580 SUPER "S" or "W"
Used for heavy load portion
Seizure resistance and heat resistance higher than molybdenum diBellows type sulfide grease Can Since this grease is white, it does not stand out against machine body.
SUNSTAR PAINT PRIMER 580 SUPER
417-926-3910
Used for normal temperature, light load bearing at places in contact with water or steam.
320 ml
Polyethylene container
Sika Japan, Sikaflex 256HV
20Y-54-39850
310 ml
Polyethylene container
SUNSTAR PENGUINE SEAL No. 2505
417-926-3920
320 ml
Polyethylene container
SEKISUI SILICONE SEALANT
20Y-54-55130
333 ml
Polyethylene container
Used as primer for cab side (Using limit: 4 months) Used as primer for glass side (Using limit: 4 months) Adhesive for cab glass
Category
COATING MATERIALS
"S" is used for high-temperature season (April - October) and "W" for low-temperature season (November - April) as adhesive for glass. (Using limit: 4 months) Used as adhesive for glass. (Using limit: 6 months) Used to seal joints of glass parts. (Using limit: 4 months) Used to seal front window. (Using limit: 6 months)
00-11
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