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Kobelco SK75-8 HYDRAULIC EXCAVATOR Service Repair Manual.pdf
1.
SHOP MANUAL model INDEX HYDRAULIC EXCAVATOR SPECIFICATIONS MAINTENANCE SYSTEM DISASSEMBLING TROUBLESHOOTING E / G OPT. 1 2 3 4 5 6 7 SPECIFICATIONS
SECTION MAINTENANCE SECTION SYSTEM SECTION DISASSEMBLY SECTION TROUBLESHOOTING ENGINE SECTION PROCEDURE OF INSTALLING OPTIONS SECTION Book Code No.S5LG0003E01 0-1 SK75-8 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
2.
0-2 GENERAL SAFETY INFORMATION Do
not operate or perform any maintenance on this machine until all instructions found in the OPERA- TOR’S MANUAL and this MANUAL have been thor- oughly read and understood. Improper operation or maintenance of this machine may cause accidents and could result in serious in- jury or death. Always keep the manual in storage. If it is missing or damaged, place an order with an authorized our Distributor for a replacement. If you have any questions, please consult an autho- rized our Distributor. (1) Most accidents, which occur during operation, are due to neglect of precautionary measures and safe- ty rules. Sufficient care should be taken to avoid these accidents. Erroneous operation, lubrication or maintenance services are very dangerous and may cause injury or death of personnel. Therefore all precautionary measures, NOTES, DANGERS, WARNINGS and CAUTIONS contained in the man- ual and on the machine should be read and under- stood by all personnel before starting any work with or on the machine. (2) Operation, inspection, and maintenance should be carefully carried out, and safety must be given the first priority. Messages of safety are indicated with marks. The safety information contained in the manual is intended only to supplement safety codes, insurance requirements, local laws, rules and regulations. (3) Messages of safety appear in the manual and on the machine : All messages of safety are identified by either word of "DANGER", "WARNING" and "CAUTION". 1) DANGER- Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury and is represented as follows: 2) WARNING- Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury and is represented as follows: 3) CAUTION- Indicates a potentially hazardous situation which, if not avoided, may result in mi- nor or moderate injury. It may also be used to alert against possible damage to the machine and its components and is represented as fol- lows: (4) It is very difficult to forecast every danger that may occur during operation. However, safety can be en- sured by fully understanding proper operating pro- cedures for this machine according to methods recommended by Manufacturer. (5) While operating the machine, be sure to perform work with great care, so as not to damage the ma- chine, or allow accidents to occur. (6) Continue studying the manual until all Safety, Oper- ation and Maintenance procedures are completely understood by all persons working with the ma- chine. Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
3.
0-3 SAFETY PRECAUTIONS The proper
and safe lubrication and maintenance for this machine, recommended by Manufacturer, are outlined in the OPERATOR’S MANUAL for the machine. Improper performance of lubrication or mainte- nance procedures are dangerous and could result in injury or death. Read and understand the MAN- UAL before performing any lubrication or mainte- nance. The serviceman or mechanic may be unfamiliar with many of the systems on this machine. This makes it important to use caution when performing service work. A knowledge of the system and or components is im- portant before the removal or disassembly of any com- ponent. Because of the size of some of the machine compo- nents, the serviceman or mechanic should check the weights noted in this manual. Use proper lifting proce- dures when removing any components. Weight of com- ponents table is shown in the section ; SPECIFICATIONS. The following is a list of basic precautions that must al- ways be observed. (1) Read and understand all Warning plates and decal on the machine before Operating, Maintaining or Repairing this machine. (2) Always wear protective glasses and protective shoes when working around machines. In particu- lar, wear protective glasses when using hammers, punches or drifts on any part of the machine or at- tachments. Use welders gloves, hood/goggles, apron and the protective clothing appropriate to the welding job being performed. Do not wear loose fit- ting or torn clothing. Remove all rings from fingers, loose jewelry, confine long hair and loose clothing before working on this machinery. (3) Disconnect the battery and hang a "Do Not Oper- ate" tag in the Operators Compartment. Remove ig- nition keys. (4) If possible, make all repairs with the machine parked on a firm level surface. Block the machine so it does not roll while working on or under the ma- chine. Hang a "Do Not Operate" tag in the Opera- tors Compartment. (5) Do not work on any machine that is supported only by lift, jacks or a hoist. Always use blocks or jack stands, capable of supporting the machine, before performing any disassembly. Do not operate this machine unless you have read and understand the instructions in the OP- ERATOR’S MANUAL. Improper machine opera- tion is dangerous and could result in injury or death. (6) Relieve all pressure in air, oil or water systems be- fore any lines, fittings or related items are discon- nected or removed. Always make sure all raised components are blocked correctly and be alert for possible pressure when disconnecting any device from a system that utilizes pressure. (7) Lower the bucket, dozer, or other attachments to the ground before performing any work on the ma- chine. If this cannot be done, make sure the bucket, dozer, ripper or other attachment is blocked correct- ly to prevent it from dropping unexpectedly. (8) Use steps and grab handles when mounting or dis- mounting a machine. Clean any mud or debris from steps, walkways or work platforms before using. Always face to the machine when using steps, lad- ders and walkways. When it is not possible to use the designed access system, provide ladders, scaf- folds, or work platforms to perform safe repair oper- ations. (9) To avoid back injury, use a hoist when lifting com- ponents which weigh 20kg (45lbs) or more. Make sure all chains, hooks, slings, etc., are in good con- dition and are the correct capacity. Be sure hooks are positioned correctly. Lifting eyes are not to be side loaded during a lifting operation. (10)To avoid burns, be alert for hot parts on machines which have just been stopped and hot fluids in lines, tubes and compartments. (11)Be careful when removing cover plates. Gradually back off the last two capscrews or nuts located at opposite ends of the cover or device and carefully pry cover loose to relieve any spring or other pres- sure, before removing the last two capscrews or nuts completely. (12)Be careful when removing filler caps, breathers and plugs on the machine. Hold a rag over the cap or plug to prevent being sprayed or splashed by liq- uids under pressure. The danger is even greater if the machine has just been stopped because fluids can be hot. Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
4.
0-4 (13)Always use the
proper tools that are in good condi- tion and that are suited for the job at hand. Be sure you understand how to use them before performing any service work. (14)Reinstall all fasteners with the same part number. Do not use a lesser quality fastener if replacements are necessary. (15)Repairs which require welding should be per- formed only with the benefit of the appropriate ref- erence information and by personnel adequately trained and knowledgeable in welding procedures. Determine type of metal being welded and select correct welding procedure and electrodes, rods or wire to provide a weld metal strength equivalent at least to that of the parent metal. Make sure to dis- connect battery before any welding procedures are attempted. (16)Do not damage wiring during removal operations. Reinstall the wiring so it is not damaged nor will be damaged in operation of the machine by contacting sharp corners, or by rubbing against some object or hot surface. Do not connect wiring to a line contain- ing fluid. (17)Be sure all protective devices including guards and shields are properly installed and functioning cor- rectly before starting a repair. If a guard or shield must be removed to perform the repair work, use extra caution and replace the guard or shield after repair is completed. (18)The maintenance and repair work while holding the bucket raised is dangerous due to the possibility of a falling attachment. Don’t fail to lower the attach- ment and place the bucket to the ground before starting the work. (19)Loose or damaged fuel, lubricant and hydraulic lines, tubes and hoses can cause fires. Do not bend or strike high pressure lines or install ones which have been bent or damaged. Inspect lines, tubes and hoses carefully. Do not check for leaks with your hands. Very small (pinhole) leaks can result in a high velocity oil stream that will be invisible close to the hose. This oil can penetrate the skin and cause personal injury. Use card-board or paper to locate pinhole leaks. (20)Tighten connections to the correct torque. Make sure that all heat shields, clamps and guards are in- stalled correctly to avoid excessive heat, vibration or rubbing against other parts during operation. Shields that protect against oil spray onto hot ex- haust components in event of a line, tube or seal failure must be installed correctly. (21)Do not operate a machine if any rotating part is damaged or contacts any other part during opera- tion. Any high speed rotating component that has been damaged or altered should be checked for balance before reusing. (22)Be careful when servicing or separating the tracks (crawlers). Chips can fly when removing or install- ing a track (crawlers) pin. Wear safety glasses and long sleeve protective clothing. Tracks (crawlers) can unroll very quickly when separated. Keep away from front and rear of machine. The machine can move unexpectedly when both tracks (crawlers) are disengaged from the sprockets. Block the ma- chine to prevent it from moving. Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
5.
0-5 33 51 47 34 11 21 46 31 32 25 1 2 3 12 13 22 23 24 Index No. Title Book Code
No. Distribution Year–Month S5LG0203E01 2012-11 S5YN0129E01 2012-11 S5LG0303E01 2012-11 S5LG1103E01 2012-11 S5LG1203E01 2012-11 S5LG1303E01 2012-11 S5LG2103E01 2012-11 S5LG2203E01 2012-11 S5LG2303E01 2012-11 S5LG2403E01 2012-11 S5LG2503E01 2012-11 S5YN3129E01 2012-11 _ _ S5LG3203E01 2012-11 S5LG3303E01 2012-11 S5LG4703E01 2012-11 _ _ _ S5YT5112E01 2012-11 _ LG01-H5001~ S5LG3403E01 2012-11 S5LG4603E01 2012-11 STANDARD MAINTENANCE TIME SCHEDULE MAINTENANCE STANDARD AND TEST PROCEDURE MECHATRO CONTROLLER DISASSEMBLING & ASSEMBLING 2 1 3 11 12 13 21 22 23 24 25 31 32 33 34 46 47 51 OUTLINE SPECIFICATIONS ATTACHMENT DIMENSIONS TOOLS HYDRAULIC SYSTEM ELECTRIC SYSTEM COMPONENTS SYSTEM AIR-CONDITIONER SYSTEM ATTACHMENT UPPER STRUCTURE TRAVEL SYSTEM BY ERROR CODES BY TROUBLE ENGINE APPLICABLE MACHINES SPECIFICATIONS MAINTENANCE SYSTEM DISASSEMBLING TROUBLESHOOTING E / G INDEX SK75-8 SE Asia Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
6.
0-6 NOTE: This Manual is
prepared as a technical material in which the information necessary for the maintenance and repairing services of our hydraulic excavators are collected, and is categorized into 7 Chapters, Specifica- tion, Maintenance, System, Disassembly, Trouble- shooting, Engine, and Installation Procedures for Optional Attachment. • The Chapter "Specification" describes the specifi- cations for entire machine and material, which are instructive for replacement and repairing of attach- ments. • The Chapter "Maintenance" describes the material, which is helpful for maintenance service and adjust- ments for entire machine. • The Chapter "System" describes the operating sys- tem like hydraulic system, electric system, compo- nents, and so on. • The Chapter "Disassembly" describes the removal and installing of assembly mounted on the upper structure and undercarriage, and the assembling and disassembling of the associated hydraulic equipment. • The Chapter "Troubleshooting" describes how to find the fault equipment. • The Chapter "Engine" describes the engines mak- ing use of the "Maintenance Manual" provided by the suppliers. • The Chapter "Installation Procedures for Optional Attachment" describes the supplements added on request as required. This Manual may be properly revised due to the im- provement of products, modification of specifications, etc. And there are cases where the system on actual machine and a part of the contents of this manual may differ due to the variations of specification by countries. For the section in which the description is hardly under- stood, contact our distributor. The number is assigned to every part handled in this Manual on account of the description, but the parts, which cannot be supplied as service parts are con- tained. Therefore, the order must be placed with re- spective formal number with due confirmation on the Parts Manual for applicable machine. Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
7.
1 1. OUTLINE [1. OUTLINE] 1-1 Book
Code No. S5YN0129E01 TABLE OF CONTENTS 1.1 GENERAL PRECAUTIONS FOR MAKING REPAIRS ……………………………………………………1-3 1.1.1 PREPARATION BEFORE DISASSEMBLING …………………………………………………………1-3 1.1.2 SAFETY WHEN DISASSEMBLING AND ASSEMBLING ……………………………………………1-3 1.1.3 DISASSEMBLING AND ASSEMBLING HYDRAULIC EQUIPMENT ………………………………1-4 1.1.4 ELECTRICAL EQUIPMENT ………………………………………………………………………………1-6 1.1.5 HYDRAULIC PARTS ………………………………………………………………………………………1-7 1.1.6 WELD REPAIR ………………………………………………………………………………………………1-7 1.1.7 ENVIRONMENTAL ISSUES ………………………………………………………………………………1-7 1.2 INTERNATIONAL UNIT SYSTEM ……………………………………………………………………………1-8 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
8.
Issue Date of
Issue Applicable Machines Remarks First Edition December, 2008 SK200-8 : YN12-56001~ SK210LC-8 : YQ12-08001~ S5YN0129E01 (SE Asia & Oceania) December, 2010 SK200-8 : YN12-58781~ SK210LC-8 : YQ12-08501~ (ANZ) SK210LC-8 : YQ12-B0101~ KCEI SK250-8 : LQ13-07375~ SK260LC-8 : LL13-06387~ (ANZ) E485C : YS (NHK) SK480LC-9 : YS (NA) SK225SR : YB06-03580~ SK225SRLC : LA06-02501~ (ANZ) January, 2011 SK330-8 : LC11-09068~ SK350LC-8 : YC11-04950~ (ANZ) September, 2011 SK225SR : YB06-03501~ (SE Asia) November, 2011 SK200-8 : YN12-H4463~H4612 Indonesia (HS Engine) December, 2011 E140CSR : YH07-09001~ (NHK-EUR) SK140SRLC-3 : YH07-09001~ (NA) February, 2012 E260CSR(N)LC : YU07-04001~ (NHK-EUR) 260SR : YU07-04001~ (NA) E230CSR : YB07- E230CSRLC : LA07-03001~ (NHK-EUR) 230SR : LA07-03001~ (NA) May, 2012 SK850LC-2 : LY03-001~ (NA) September, 2012 E75CSR : YT08-30001~ (NHK-EUR) 75SR-3 : YT08-30001~ (NA) SK75SR-3 : YT07-25001~ (SE Asia & Oceania) SK85MSR-3 : LF07-05001~ (OCE) October, 2012 E85CMSR : LF08-05501~ (NHK-EUR) 85CS-3 : LF08-05501~ (NA) November, 2012 SK75-8 : LG01-H5001~ (SE Asia) [1. OUTLINE] 1-2 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
9.
1 1.1 GENERAL PRECAUTIONS
FOR MAKING REPAIRS 1.1.1 PREPARATION BEFORE DISASSEMBLING (1) Knowledge of operating procedure Read Operator's Manual carefully to understand the operating procedure. (2) Cleaning machines Clean machines of soil, mud, and dust before carrying into the service shop. Carrying a soiled machine into the service shop, causes making less efficient work and damage of parts. (3) Inspecting machines Confirm the disassembling section before starting work, determine the disassembly procedure taking the conditions in work shop into account, and request to procure necessary parts in advance. (4) Recording Record the following items to keep contact and prevent malfunction from recurring. 1. Inspecting date, place 2. Model name, Serial number and Record on hour meter 3. Trouble condition, place, cause 4. Visible oil leak, water leak and damage 5. Clogging of filters, oil level, oil quality, oil contamination and looseness. 6. Examine the problems on the basis of monthly operation rate with the last inspection date and records on hour meter. (5) Arrangement and cleaning in service shop 1. Tools required for repair work. 2. Prepare the places to put the disassembled parts. 3. Prepare oil pans for leaking oil, etc. 1.1.2 SAFETY WHEN DISASSEMBLING AND ASSEMBLING (1) Safety 1. Wear appropriate clothing, safety shoes, safety helmet, goggles, and clothes with long sleeves. 2. Attach "Don't operate" tag to control lever, and begin a meeting before starting the work. 3. Before starting inspection and maintenance stop the engine. 4. Confirm the position of first-aid kit and fire extinguisher, and also where to make contact for emergency measure and ambulance to prepare for accidents and fire. 5. Choose a hard, level and safe place, and put attachment on the ground without fail. 6. Use hoist, etc. to remove parts of heavy weight (23kg [50 lb] or more). 7. Use proper tools, and change or repair defective tools. 8. Machine and attachment required to work in the lifting condition should be supported with supports or blocks securely. [1. OUTLINE] 1-3 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
10.
1.1.3 DISASSEMBLING AND
ASSEMBLING HYDRAULIC EQUIPMENT (1) Removing hydraulic equipment assy 1. Before removing pipes, release the pressure of hydraulic oil tank, or open the cover on the return side to tank, and take out the filter. 2. Drain the oil in the removed pipes into pan to prevent the oil from spilling on the ground. 3. Pipes with plugs or caps to prevent oil leaking, entry of dust, etc. 4. Clean the outside surface of equipment, etc. before disassembling, and drain hydraulic oil and gear oil before putting them on working bench. (2) Disassembling hydraulic equipment 1. Since performance and function of hydraulic equipment after disassembly and assembly results in immunity from responsibility on the manufacture's side, disassembly, assembly and modification without permission are strictly prohibited. 2. If it is unavoidably necessary to disassemble and modify, it should be carried out by experts or personnel qualified through service training. 3. Make match mark on parts for reassembling. 4. Before disassembling, read Disassembling Instruction in advance, and determine if the disassembly and assembly are permitted or not. 5. For parts which are required to use jig and tools, don't fail to use the specified jig and tools. 6. For parts which can not be removed in the specified procedure, never force removal. First check for the cause. 7. The removed parts should be put in order and tagged so as to install on proper places without confusion. 8. For common parts, pay attention to the quantity and places. (3) Inspecting parts 1. Check that the disassembled parts are free from adherence, interference and uneven working face. 2. Measure the wear of parts and clearance, and record the measured values. 3. If an abnormality is detected, repair or replace the parts. (4) Reassembling hydraulic equipment 1. During the parts cleaning, ventilate the room. 2. Before assembly, clean parts roughly first, and then completely. 3. Remove adhering oil by compressed air, and apply hydraulic oil or gear oil, and then assemble them. 4. Replace the removed O-ring, back-up rings and oil seal with new ones, and apply grease oil on them before assembling. 5. Removes dirt and water on the surface on which liquid sealant are applied, decrease them, and apply liquid sealant on them. 6. Before assembling, remove rust preventives on new parts. 7. Use special tools to fit bearings, bushing and oil seal. 8. Assemble parts matching to the marks. 9. After completion, check that there is no omission of parts. [1. OUTLINE] 1-4 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
11.
1 (5) Installing hydraulic
equipment 1. Confirm hydraulic oil and lubrication oil. 2. Air release is required in the following cases ; a. Change of hydraulic oil b. Replacement of parts on suction pipe side c. Removing and attaching hydraulic pump d. Removing and attaching swing motor e. Removing and attaching travel motor f. Removing and attaching hydraulic cylinder 3. For air bleed of hydraulic pump and swing motor, loosen drain plug on the upper part, start engine, and run in low idling, then bleed air until hydraulic oil is comes out. After completion of comes, tighten plug securely. 4. For air bleed of travel motor and hydraulic cylinder, starts engine and operate it for 10 minutes or more at no-load and low speed. 5. Air in pilot circuit can be bleed out by only operating digging, swing and traveling motions thoroughly. 6. Check hydraulic oil level. Move attachments to hydraulic oil check position, and check hydraulic oil level of tank. Refill oil if the oil level is lower than the specified level. How to check oil level of hydraulic oil tank If hydraulic oil and lubricating oil are not filled and also air bleed is not performed, the hydraulic equipment may be damaged. For cylinder, don't move it to the stroke end at beginning. [1. OUTLINE] 1-5 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
12.
1.1.4 ELECTRICAL EQUIPMENT (1)
The disassembly of electrical equipment is not allowed. (2) Handle equipment with care so as not to drop it or bump it. (3) Connector should be removed by unlocking while holding the connector. Never stress in tension to the caulked section by pulling wire. (4) Check that connector is connected and locked completely. (5) Engine key off before removing and connecting connector. (6) Engine key off before touching terminals of starter and alternator. (7) Remove battery grounding terminal before beginning work close to battery and battery relay with tools. (8) Wash machine with care so as not to splash water on electrical equipment and connector. (9) When water has entered in the waterproofed connector, the removing of water is not easy. So check the removed waterproofed connector with care to protect it from entry of water. If moisture adheres on it, dry it completely before connecting. Battery fluid is dangerous. The battery fluid is dilute sulfuric acid, and causes scald and loss of eyesight by adhering on eyes, skin and clothes. When the fluid has adhered on them, take an emergency measure immediately and see a doctor for medical advice. -When it has adhered on skin; Wash with soap and water. -When it has got in eyes; Wash in water for 10 minutes or more immediately. -When it has spilled out in large quantity; Use sodium bicarbonate to neutralize, or wash away with water. -When it was swallowed; Drink milk or water. -When it has adhered on clothes; Wash it immediately. [1. OUTLINE] 1-6 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
13.
1 1.1.5 HYDRAULIC PARTS (1)
O-ring ・ Check that O-ring is free from flaw and has elasticity before fitting. ・ Even if the size of O-ring is equal, the usage differs, for example in dynamic and static sections, the rubber hardness also differs according to the pressure force, and also the quality differs depending on the materials to be seated. So, choose proper O-ring. ・ Fit O-ring so as to be free from distortion and bend. ・ Floating seal should be put in pairs. (2) Flexible hose (F hose) ・ Even if the connector and length of hose are the same, the parts differ according to the withstanding pressure. Use proper parts. ・ Tighten it to the specified torque, and check that it is free from twist, over tension, interference, and oil leak. 1.1.6 WELD REPAIR (1) The weld repair should be carried out by qualified personnel in the specified procedure after disconnecting the grounding cable of battery. If the grounding cable is not disconnected, the electrical equipment may be damaged. (2) Remove parts which may cause fire due to the entry of spark beforehand. (3) Repair attachments which are damaged, giving particular attention to the plated section of piston rod to protect it from sparks, and don't fail to cover the section with flame-proof clothes. 1.1.7 ENVIRONMENTAL ISSUES (1) Engine should be started and operated in the place where air can be sufficiently ventilated. (2) Waste disposal The following parts follows the regulation. Waste oil, waste container and battery (3) Precautions for handling hydraulic oil Hydraulic oil may cause inflammation of eyes. Wear goggles to protect eyes on handling it. -When it has got in eyes ; Wash eyes with water until the stimulus is gone. -When it was swallowed ; Don't force him to vomit it, but immediately receive medical treatment. -When it has adhered on skin ; Wash with soap and water. (4) Others For spare parts, grease and oil, use KOBELCO genuine ones. [1. OUTLINE] 1-7 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
14.
Introduction Although this manual
uses the SI units system. Outline of SI units system is described here. Given hereinunder are an excerpt of the units that are related to this manual : 1. Etymology of SI Units English : International System of units 2. Construction of SI Unit System 1.2 INTERNATIONAL UNIT SYSTEM [1. OUTLINE] 1-8 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
15.
Tightening torque N-m (lbf-ft) No.
Parts Q'ty Tightening torque N-m (lbf-ft) No. Parts Q'ty 101 151 201-1 201-2 211 Casing Plate Spool Spool Plug 1 1 2 2 4 *218-1 *218-2 221 241-1 241-2 Seat Seat Spring Spring Spring 2 2 4 2 2 212 213 214 216-1 216-2 Push rod Seal O-ring; 1B P20 Spring seat Spring seat 4 4 4 2 2 47.1 (35) 68.6 (51)☆ *246 301 302 312 501 Spring Joint: M14 Circular plate Adjust nut: M14 Boots 4 1 1 1 1 217 Washer 2 (Shim) 4 33.2.3 PILOT VALVE (FOR ATT) 33.2.3.1 CROSS-SECTIONAL VIEW Pilot valve (For ATT) Apply loctite #277 to areas marked ☆ Note) The parts marked * might not be equipped depending on valve type. [33. UPPER SLEWING STRUCTURE] 33-94 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
16.
(1) Plug each
port of pilot valve, and clean it with kerosine. P port: PF1/4 1 to 4 and T port: PF3/8 (2) Fix pilot valve with vise via a protective plate (Alminum plate etc.), and remove boots (501). (3) Remove adjusting nut (312) applying spanners to adjusting nut (312) and circular plate (302). Tools: Spanner: 22mm, 32mm 33 33.2.3.2 DISASSEMBLY Removing boot (501) Removing adjusting nut (312) [33. UPPER SLEWING STRUCTURE] 33-95 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
17.
(4) Remove circular
plate (302) Tools: Spanner: 32mm (5) Turn joint (301) in counterclockwise with Jig A to remove. Jig A: See page 33.2.3.7(1). Tools: Spanner: 24mm Removing circular plate (302) Circular plate is removed Installing Jig A Removing joint (301) When the force of return springs (221) is strong, never loosen joint (301). If loosened, it might result in jumping out of plate (151), plug (211) and push rod (212). Remove joint (301) pressing plate (151) downward with two fingers. [33. UPPER SLEWING STRUCTURE] 33-96 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
18.
(6) Remove plate
(151) -When the force of return springs (221) are strong, press plate to let it come up slowly. -When the force of return springs (221) are weak, plug is left in casing (101) due to sliding resistance of O-ring (214). Tools: Pull plug (211) out with a driver. (7) Remove push rod (212), plug (211), pressure reducing valve assy (spool), return springs (221) from casing (101). 33 Removing plate (151) Removing plug (211) To prevent personal injury, plug (211) must be removed slowly and evenly until the return spring (221) force is completely released. Removing push rod, plug, pressure reducing valve and spring Record combination of port holes on casing and the pulled out parts. The stroke differs according to direction. [33. UPPER SLEWING STRUCTURE] 33-97 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
19.
(8) Push springs
(241-1), (241-2) in the range of 7mm (0.276in) that the movement of spring seats (216-1), (216-2) and shift the seats (216) in a side direction, and remove spools (201-1), (201-2) through the larger hole of seat. (9) Remove spool (201-1), (201-2), spring seats (216-1), (216-2), spring (241-1), (241-2) and washer (217). (10) Remove spring (*246), spring seat (*218-1), (*218-2) from push rod (212). Removing spool (201) Never push down spring seat (216-1) in 7 mm (0.276 in) or more. (For port 1,3) Never push down spring seat (216-2) in 9.4 mm (0.370 in) or more. (For port 2,4) Disassembling pressure reducing valve Disassembling push rod The parts marked * might not be equipped depending on valve type. [33. UPPER SLEWING STRUCTURE] 33-98 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
20.
(11) Pull out
push rod (212) from plug (211). (12) Remove O-ring (214) from plug (211). (13) Remove inside seal (213) from plug (211) with small driver. (1) Fit washer 2 (217), springs (241-1), (241-2), spring seats (216-1), (216-2) to spool (201-1), (201-2). 33 Removing push rod (212) Removing seal (213) 33.2.3.3 CLEANING PARTS (1) Clean parts with wash oil roughly. (2) Clean parts with wash oil completely. (3) Dry parts by swabbing clean rag. (4) Apply rust preventives on parts. 33.2.3.4 ASSEMBLING Assembling pressure reducing valve [33. UPPER SLEWING STRUCTURE] 33-99 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
21.
(2) Push spring
(241-1), (241-2) in the range of that the movement of spring seats (216-1), (216-2) in a side direction, and install spools (201-1) through the larger hole of spring seat. (3) Place spring (221) into ports 1,3 of casing (101), and then install pressure reducing valve assy in it. Place springs (221) into ports 2,4 and install it. Installing spools (201-1), (201-2) Never push down spring seat (216-1) in 7mm (0.276in) or more. (For port 1,3) Never push down spring seat (216-2) in 9.4mm (0.370in) or more. (For port 2,4) Installing pressure reducing valve assy Install the removed respective assy into respective holes. [33. UPPER SLEWING STRUCTURE] 33-100 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
22.
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23.
(5) Insert push
rod (212) in plug (211) and install spring (*246) and spring seat (*218-1) to push rod (212) on port 1,3 side. And install spring seat (*218-2) to push rod on port 2,4 side. 1. When the force of spring (211) is weak, it stops at the position where it is pushed in by the sliding resistance of O-ring (214). 33 (4) Fit O-ring (214) and seal (213) into plug (211). -Apply hydraulic oil on surface of push rod. Installing O-ring (214) and seal (213) Assembling push rod, spring (246) and seat (218) The parts marked * might not be equipped depending on valve type. (6) Fit plug (211) assy to casing (101). Installing plug assy [33. UPPER SLEWING STRUCTURE] 33-101 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
24.
2. When the
force of spring (221) is strong, attach plate (151) and press 4 push rods by hand at the same time, and tighten joint (301) temporarily. -Install spool (201) straight and evenly into the hole of casing (101). -Take care so that plug (211) and plate (151) do not jump out of casing (101). (7) Install joint (301) on casing (101) with jig A securely. Jig A : See 33.2.3.7 JIG. Tightening torque : 47.1N-m (32.8 to 37.2 lbf-ft) (8) Install circular plate (302) to joint (301) (9) Screw adjusting nut (312) in until it touches circular plate (302), and tighten it applying spanner to stop circular plate returning. Tools: Spanner: 32mm Tools: Socket: 22mm -Apply Loctite #277 to threads of joint. Tightening torque: 68.6N-m (51 lbf-ft) Installing plug assy and plate (151) Installing joint (301) Installing circular plate (302) -Screw it in until it comes in contact with 4 push rods (212) equally. -The exceeding of screw in may cause malfunction of machine. [33. UPPER SLEWING STRUCTURE] 33-102 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
25.
(10) Apply heat-resisting
grease to joint (301) rotating section and the top of push rod (212). (11) Cover it with boots. (12) Spray rust preventives through each port and attach plug respectively. 33 Applying grease to joint section and push rod [33. UPPER SLEWING STRUCTURE] 33-103 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LG0003E01] [0811CsCshWbYs]
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