Komatsu WA270-3 WA270PT-3 wheel loader service manual

00-2 CONTENTS 00 SAFETY ............................................................................. 00-3 01 GENERAL ......................................................................... 01-1 10 STRUCTURE AND FUNCTION ....................................... 10-1 20 TESTING AND ADJUSTING ............................................ 20-1 30 DISASSEMBLY AND ASSEMBLY ................................... 30-1 90 OTHERS ........................................................................... 90-1 No. of page

SAFETY Safety Notice 00-3 00 SAFETY Safety Notice = Important Safety Notice Proper service and repair is extremely important for safe machine operation. Some of the described service and repair techniques require the use of tools specially designed by Komatsu for the specific purpose. To prevent injury to workers, the symbol = is used to mark safety precautions in this manual. The cautions accompanying these symbols must 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! Always follow the safety rules valid in your country carefully! 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. l Always wear safety glasses when hitting parts with a hammer. l 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, glasses, 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. Never smoke while working. Smoke only in the areas provided for smoking. 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 and install the safety bar on the frame. 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.

Safety Notice SAFETY 00-4 Precautions during Work 11. When measuring hydraulic pressure, check that the measuring tool is correctly assembled before taking any measurements. 12. 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 com- pletely from the circuit. 13. 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. 14. Before starting work, remove the leads from the battery. Always remove the lead from the negative (-) ter- minal first. 15. 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. 16. 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. 17. When removing components, be careful not to break or damage the wiring. Damaged wiring may cause electrical fires. 18. 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. 19. As a general rule, do not use gasoline to wash parts. In particular, use only the minimum of gasoline when washing electrical parts. Do not smoke! 20. Be sure to assemble all parts again in their original places. Replace any damaged parts with new parts. l When installing hoses and wires, be sure that they will not be damaged by contact with other parts when the machine is being operated. 21. 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. Al- so, check that connecting parts are correctly installed. 22. When aligning two holes, never insert your fingers or hand. Be careful not to get your fingers caught in a hole. 23. 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.

SAFETY Foreword 00-5 Foreword General This shop manual has been prepared as an aid to improve the quality of repairs by giving the service personnel an accurate understanding of the product and by showing them 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. 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" to "Causes" are also in- cluded in this section. Disassembly and Assembly This section explains the order to be followed when removing, installing, disassembling or assembling each component, as well as precautions to be taken for these operations. Maintenance Standard This section gives the judgement standards when inspecting disassembled parts. NOTE: The specifications contained in this shop manual are subject to change at any time and without any ad- vance notice. Use the specifications given in the book with the latest date.

How to Read the Shop Manual SAFETY 00-6 How to Read the Shop Manual Volumes Shop manuals are issued as a guide to carrying out repairs. 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 number. Example 1 (Chassis volume): 3. Additional pages: Additional pages are indicated by a hyphen (-) and number after the page number. File as in the example. Example: 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 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. Weight Weight of parts of systems. Caution necessary when selecting hoisting wire, or when working posture is important, etc. Tightening torque Places that require special attention for the tightening torque during assembly. Coat Places to be coated with adhesives and libricants, etc. Oil, water Places where oil, water or fuel must be added, and the capacity. Drain Places where oil or water must be drained, and quantity to be drained. 10 - 3 Item number (10. Structure and Function) Consecutive page number for each item 10-4 10-4-1 10-4-2 10-5 Added Pages = « 4 3 2 5 6

SAFETY Hoisting Instructions 00-7 Hoisting Instructions = Heavy parts (25kg or more) must be lifted with a hoist, etc. In the DISASSEMBLY AND ASSEMBLY section, every part weigthing 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, refering to the table below: « The allowable load in tons, is given by vertical tensible force. « 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 hook. 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. Wire ropes: (Standard "Z" or "S" twist ropes without galvanizing) Rope diameter (mm) Allowable load (tons) 10 1.0 11.2 1.4 12.5 1.6 14 2.2 16 2.8 18 3.6 20 4.4 22.4 5.6 30 10.0 40 18.0 50 28.0 60 40.0 4 100% 88% 79% 71% 41%

Hoisting Instructions SAFETY 00-8 3. Do not sling a heavy load with one rope alone, but sling with two or more ropes symmetrically wound onto the load. = 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 (kg) when hoisting is made with two ropes, each of which is allowed to sling up to 1000 kg vertically, at various hanging angles. When two ropes sling a load vertically, up to 2000 kg of total weight can be suspended. This weight beco- mes 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 4000 kg if they sling a 2000 kg load at a lifting angle of 150°. 300 600 900 1200 1500 1000 2000 2000 1900 1700 1400 1000 500 kg Lifting angle (α) Load capacity (kg) α Hebewinkel (°) Gewicht (kg)

01-1 01 GENERAL General overwiew WA270-3 ............................. 01-3 General overwiew WA270PT-3 ......................... 01-4 Technical datas ................................................ 01-5 Weight table WA270-3 ..................................... 01-8 Weight table WA270PT-3 ................................ 01-9 List of lubricant and water ............................. 01-10 Maintenance schedule .................................... 01-11 Outlines of service .......................................... 01-12 Torque list .................................................... 01-16 General view of controls and gauges ............ 01-17 Emergency drive ............................................ 01-18

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Komatsu WA270-3 WA270PT-3 wheel loader service manual

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