YANMAR B50-2B US EXCAVATOR SERVICE MANUAL – PDF DOWNLOAD
YANMAR B50-2B US EXCAVATOR SERVICE MANUAL – PDF DOWNLOAD:
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YANMAR B50-2B US EXCAVATOR SERVICE MANUAL – PDF DOWNLOADYANMAR B50-2B US EXCAVATOR SERVICE MANUAL – PDF DOWNLOAD
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YANMAR B50-2B US EXCAVATOR SERVICE MANUAL – PDF DOWNLOAD
Correct work means the quickest possible completion of according to the correct procedures and the specified standards.
It is important when conducting certain operations always to bear in mind the equipment, tools, gauges, materials, oil and grease, etc. that you must have ready, as well as items to be checked, adjusted, or disassembled, and cautions to watch out for.
(1) Never attempt servicing while engine is running or immediately after stopping operation. (2) Wear work cloths, safety shoes and helmet. (3) Check the equipment and tools before use. Especially, be sure to check the crane, lifting equipment and tools.
(4) When working together with other persons, allocate everyone’s share of job, arrange the signals and act in concert with the other persons. (5) The operation of the crane and slinging work must be performed by qualified persons.
(6) Do not enter or pass under the raised load. (7) Lift and support the massive parts by crane before removing the installation bolts. (8) Disconnect cables from battery before repairing the electric system.
(9) Remove the battery when welding the machine. (1) Check the service record of the machine. (That is, check how many months or hours the machine has been used since the preceding overhaul, what was the trouble then and what parts were replaced.)
(2) Have all servicing tools ready, i.e., tools, measuring devices (which have received periodic maintenance), containers, oil & grease, etc. (3) Have the service literature (operation manual, parts catalog, etc.) ready.
(1) Clean the machine before disassembly. (2) Check and record the condition of the machine before disassembly : • Model, machine number, operation hours • Reasons for repair, history of repair •
Contamination of filters • Fuel and oil condition • Damage to parts, etc. (3) Place alignment marks on the necessary parts to facilitate reassembly. (4) Clean all the removed parts and new replacement parts and put them in order. (5) Use new seals, split pins, etc. for reassembly.
TABLE OF CONTENTS:
YANMAR B50-2B US EXCAVATOR SERVICE MANUAL – PDF DOWNLOAD
B50-2B(US).................................................................................... 0
FOREWORD...................................................................................... 2
CONTENTS...................................................................................... 3
1 GENERAL CAUTIONS FOR MAINTENANCE WORK....................................................... 6
1-1 Correct Work.......................................................................... 7
1-2 Safety Precautions.................................................................... 7
1-3 Preparations.......................................................................... 7
1-4 Cautions for Disassembly and Reassembly............................................... 7
1-5 Cautions for Attaching and Detaching Hydraulic Equipment.............................. 8
1-6 Cautions for Attaching and Detaching Hydraulic Piping................................. 8
1-7 Cautions for Handling Seals........................................................... 8
1-8 Correct Installation of Hydraulic Hose............................................... 9
1-9 Specifications of Hydraulic Hose...................................................... 11
1-10 Air-Venting of Hydraulic Equipment.................................................. 14
2 TECHNICAL DATA.............................................................................. 15
2-1 Specifications........................................................................ 16
2-2 External Drawings and Working Ranges.................................................. 23
2-2-1 Canopy Type Specifications...................................................... 23
2-2-2 Cabin Type Specifications....................................................... 24
2-3 Weight of Main Parts.................................................................. 25
2-4 Lifting Capacities.................................................................... 26
3 SERVICING STANDARDS......................................................................... 27
3-1 Machine Performance................................................................... 28
3-2 Engine................................................................................ 32
3-3 Undercarriage......................................................................... 36
3-3-1 Rubber Track Specifications..................................................... 36
3-3-2 Steel Track Specifications...................................................... 37
3-3-3 Steel & Rubber Track Common Specifications...................................... 38
3-4 Control Devices....................................................................... 39
3-5 Hydraulic Equipment................................................................... 40
3-5-1 Hydraulic Cylinder.............................................................. 40
3-6 Work Implement........................................................................ 41
3-6-1 Front Attachment................................................................ 41
3-6-2 Blade Moving Device............................................................. 42
3-6-3 Bucket Teeth.................................................................... 42
3-7 Torque Specifications................................................................. 43
3-7-1 Machine......................................................................... 43
3-7-2 Engine.......................................................................... 45
3-7-3 Tightening Torque of General Bolts and Nuts..................................... 45
4 ENGINE...................................................................................... 46
4-1 Measurement,Inspection and Adjustment................................................. 47
4-1-1 Measuring the Compression Pressure.............................................. 47
4-1-2 Adjustment the Valve Head Clearance............................................. 49
4-1-3 Checking the V-belt Tension..................................................... 50
4-1-4 Checking the Fuel Injection Valve............................................... 50
4-1-5 Checking and Adjustment the Fuel Injection Timing............................... 54
4-1-6 Adjustment the No-load Maximum(or Minimum) Revolutions.......................... 59
4-1-7 Checking the Cooling Water System and Radiator for Water Leakage................ 59
4-1-8 Checking the Sensors............................................................ 60
4-2 Measuring Process,Service Data and Corrective Action.................................. 61
4-2-1 Cylinder Head................................................................... 61
4-2-2 Cylinder Block.................................................................. 67
4-2-3 Valve Rocker Arm................................................................ 70
4-2-4 Pistons and Piston Ring......................................................... 72
4-2-5 Connecting Rod.................................................................. 77
4-2-6 Camshaft........................................................................ 80
4-2-7 Crankshaft...................................................................... 82
4-2-8 Gears........................................................................... 85
4-2-9 Trochoid Pump................................................................... 87
4-3 Precautions Reassembly................................................................ 88
4-4 Fuel Supply System.................................................................... 92
4-4-1 Fuel Injection Pump............................................................. 92
4-4-2 Fuel Feed Pump.................................................................. 94
4-4-3 Fuel System..................................................................... 95
4-4-4 Fuel Injection Valve............................................................ 95
4-4-5 Governor Machanism.............................................................. 96
4-4-6 Specification of Fuel Injection Pump............................................ 99
4-4-7 Service Data for Fuel Injection Equipment.......................................100
4-5 Electrical Equipment..................................................................101
4-5-1 Starting Motor..................................................................101
4-5-2 Alternator......................................................................103
4-5-3 Air Heater......................................................................105
5 HYDRAULIC SYSTEM............................................................................106
5-1 Outline...............................................................................107
5-1-1 Control Valve Operation.........................................................110
5-1-2 Additional Operation of Control Valve...........................................112
5-2 Hydraulic Circuit Schematic(with P.T.O. Selector Valve)...............................113
5-3 Circuit Operation.....................................................................115
5-3-1 Boom............................................................................115
5-3-2 Arm.............................................................................117
5-3-3 Bucket..........................................................................119
5-3-4 Swing...........................................................................121
5-3-5 Boom Swing......................................................................123
5-3-6 Blade...........................................................................125
5-3-7 Travel..........................................................................127
5-3-8 Simultaneous Operation of Travel and Boom/Bucket................................129
5-3-9 Simultaneous Operation of Travel and Arm/Boom Swing............................131
5-3-10 Simultaneous Operation of Boom Up and Arm Retract..............................133
5-3-11 Simultaneous Operation of Boom Up and Bucket...................................135
5-3-12 Simultaneous Operation of Boom Up and Swing....................................137
5-3-13 Simultaneous Operation of Arm and Bucket.......................................139
5-3-14 P.T.O..........................................................................141
5-4 Pressure Adjustment...................................................................145
5-4-1 Relief Valves...................................................................145
5-4-2 Swing Brake Valves..............................................................147
5-4-3 Cut-off Valve...................................................................148
6 HYDRAULIC EQUIPMENT.........................................................................150
6-1 Hydraulic Pump........................................................................151
6-2 Control Valve.........................................................................184
6-3 Pilot Valve...........................................................................229
6-4 Swing Motor...........................................................................256
6-5 Travel Motor..........................................................................286
7 ADJUSTMENT PROCEDURES FOR EACH EQUIPMENT....................................................329
7-1 Electeic Equipment of the Machine.....................................................330
7-1-1 Arrangement of Electrical Equipment and Names of Parts..........................330
7-1-2 Monitor and Alarm Systems.......................................................332
7-1-3 Wiring Diagram..................................................................336
7-2 Undercarriage.........................................................................337
7-2-1 Outline.........................................................................337
7-2-2 Major Parts.....................................................................337
7-2-3 Cautions for Reassembly(Rubber Track Models)....................................338
7-2-4 Cautions for Reassembly(Steel Track Models).....................................339
7-2-5 Disassembly and Reassembly of Idler.............................................341
7-2-6 Disassembly and Reassembly of Track Roller......................................343
7-2-7 Disassembly and Reassembly of Carrier Roller....................................344
7-2-8 Drawings of Jigs................................................................345
7-3 Controls..............................................................................348
7-3-1 Control Train...................................................................348
7-3-2 Disassembly and Reassembly of Mechanical Control Linkage........................349
7-3-3 Adjustment of Implements and Swing Control Levers...............................351
7-3-4 Adjustment of Travel Levers.....................................................352
7-3-5 Adjustment of 2-Speed Pedal.....................................................353
7-3-6 Adjustment of Boom Swing Pedal..................................................354
7-3-7 Adjustment of Blade Lever.......................................................355
7-3-8 Adjustment of Lock Lever........................................................356
7-3-9 Adjustment of Engine Speed Control..............................................358
7-4 Swing System..........................................................................359
7-4-1 Swing Bearing...................................................................359
7-5 Hydraulic Equipment...............................................................361
7-5-1 Precautions for Removal and Installation, and Assembly of Hydraulic Pump....361
7-5-2 Disassembly and Reassembly of Hydraulic Cylinder............................366
7-5-3 Swivel Joint................................................................367
7-5-4 Hydraulic Oil Tank..........................................................371
7-5-5 Hydraulic Piping Layout.....................................................373
8 PERIODIC INSPECTION AND SERVICING...........................................................381
8 List of Periodic Inspection and Servicing...............................................382
9 FUEL,LUBE OIL AND GREASE RECOMMENDED........................................................384
9-1 Fuel, Lube Oil and Grease Recommended by Yanmar.......................................385
9-2 Cooling Water Recommended by Yanmar...................................................386
10 TROUBLESHOOTING............................................................................387
10-1 Non-breakdowns.......................................................................388
10-1-1 Natural Release of Bucket......................................................388
10-1-2 Discontinuous Arm Movement.....................................................388
10-1-3 Drifting of Upperstructure Quick Travel Operation..............................389
10-1-4 Thermal Shock of Travel Motor .................................................390
10-1-5 Elongation of Boom Swing Cylinder on 90 degrees Swing..........................391
10-1-6 Telescopic Motion of Boom Swing Cylinder with lock Lever in "Lock"Position.....392
10-1-7 Time Lag on Switching travel Speed............................................393
10-1-8 Hydraulic oil Tank Oil Level Fluctuation Through Temperature Change............394
10-2 Troubleshooting......................................................................395
10-2-1 Machine and Engine.............................................................395
10-2-2 Electrical Equipment on Panel..................................................416
11 REFERENCE DATA.........................................................................424
11-1 Specifications for Attachment....................................................425
PLEASE NOTE:
This is the SAME exact manual used by your dealers to fix your vehicle.
The same can be yours in the next 2-3 mins as you will be directed to the download page immediately after paying for the manual.
Any queries / doubts regarding your purchase, please feel free to contact [email protected]
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