Volvo G726 VHP, G726B Motor Graders Repair & Service Manual
Complete repair service manual with Electrical Wiring Diagrams for Volvo G726 VHP, G726B Motor Graders, with all the technical information to maintain, diagnose, repair, and rebuild like professional mechanics.
Volvo Constructions G726 VHP, G726B Motor Graders workshop service repair manual includes:
* Numbered table of contents easy to use so that you can find the information you need fast.
* Detailed sub-steps expand on repair procedure information
* Numbered instructions guide you through every repair procedure step by step.
* Troubleshooting and electrical service procedures are combined with detailed wiring diagrams for ease of use.
* Notes, cautions and warnings throughout each chapter pinpoint critical information.
* Bold figure number help you quickly match illustrations with instructions.
* Detailed illustrations, drawings and photos guide you through every procedure.
* Enlarged inset helps you identify and examine parts in detail.
Volvo G726B Motor Graders Repair & Service Manual.pdf
PRODUCT DETAILS:
Total Pages: 1,253 pages
File Format: PDF (Windows & Mac & Linux)
Language: English
TABLE OF CONTENTS
0 - Foreword................2
0 - GENERAL................3
00 - DESCRIPTION; COMPLETE MACHINE................4
Description-[1238]................5
Product identification plates................8
03 - SPECIFICATIONS................11
Dimensions................12
05 - TRANSPOET INSTRUCTION; STORAGE INSTRUCTION; OPERATIONG INSTRUCTION................14
Transporting the machine................15
Storage................20
Grader setup instructions................22
07 - STANDARD TIME................44
Operation numbers for additional work................45
08 - TOOL................47
G700B Special tools................48
09 - MISCELLANEOUS................50
Removing corrosion protective coating................51
1 - STANDARD PARTS; SERVICE................52
17 - SERVICE................53
Hydraulic oil return filter; replacing................54
Towing................59
Jump-start procedure................62
19 - GENERAL................63
Safety concerns everybody!-[5807]................64
CE marking and declaration of conformity................65
Environment................67
Safety when handling the machine................69
Service positions................74
Fire prevention measures................79
Health hazards with paint; plastics and rubber................82
Check list after fire or heat exposure................84
Safety when handling tyres................85
Safety when lifting and supporting the machine................86
Safety when handling oil and fuel................87
Safety when working on the electrical system................88
Safety when working with batteries................89
Battery; charging................91
Safety when working with air-conditioning refrigerant................93
Safety when working on hydraulic systems................95
Safety concerns everybody!................96
Electric welding................97
16 - LUBRICANT; FUEL; OTHER FLUID................99
Fuel system................100
Recommended lubricants................101
Grease................103
Coolant................104
Tandem_oil disc brake oils................105
Alternative fuels................107
2 - ENGINE WITH MOUNTING AND EQUIPMENT................110
21 - ENGINE................111
Specifications; D7D - general_{11-44-22}................113
Specifications; D10B - general_{11-44-00}................114
Specifications; D7D - weight................115
Specifications; D10B - weight................116
Specifications; D7D - capacities_{11-42-46}................117
Specifications; D10B - capacities_{11-42-24}................118
Engine; removing_{11-41-51}................119
Engine; removing_{11-41-26}................123
Specifications; D7D - tightening torques_{11-40-50}................127
Specifications; D10B - tightening torques_{11-40-28}................128
Cylinder compression; testing................129
Cylinder head - D10B; description_{11-38-14}................134
Cylinder head - D7D; description_{11-37-49}................136
Cylinder block - D10B; description................138
Oil trap - D10B; description................139
Cylinder liner; piston; D7D description................140
Cylinder liners; D10B description................143
Cylinder liner; piston; D10B................145
Valves; adjusting_{11-34-08}................147
Valves; adjusting_{11-33-44}................150
Valves; adjusting_{11-33-14}................152
Valves; adjusting................155
Valves - D7D; description................157
Valve mechanism - D10B; description................159
Valve mechanism - D10B; specifications................161
Engine timing gear - D10B; description................162
Camshaft - D10B; description................164
Connecting rod; D7D................165
Crankshaft; D7D................167
Torsional vibration damper; D7D................169
Crankshaft rear oil seal; replacing................171
Crankshaft and vibration damper; D10B................173
22 - LUBRICATING SYSTEM................175
Specifications; D7D................176
Lubrication oil circuit; D7D engine– Models G710B to G730B................177
Lubrication system - D10B; description................180
General; Lubrication oil pump D7D................183
23 - FUEL SYSTEM................185
Fuel system; description_{11-22-42}................186
Fuel system; description_{11-22-20}................187
Fuel system components; D10B................195
Fuel flow; D10B................197
Fuel feed pump - D10B; description................199
Water trap; D10B................201
Injection pump - D10B; specifications................202
Injection pump - D10B; description................203
Fuel shut-off valve; D10B................205
Overflow valve; D10B................207
Injectors - D10B; specification................208
Injectors - D10B; description................209
Injectors; replacing................212
Injection system - D7D; E-ECU overview................218
25 - INLET & EXHAUST SYSTEM................222
Exhaust system - D7D engine................223
Exhaust system - D10B engine................225
General-[1230]................227
Air cleaner................228
Preheating coil; D10B................230
Intercooler D10B; specifications................232
Intercooler; D10B................233
Cooling system - D7D engine; description................235
Cooling system - D10B engine; description................238
27 - ENGINE CONTROL................241
Accelerator_decelerator pedal................242
Hand Throttle................244
VHP (Variable Horsepower)................246
20 - GENERAL................247
Description; D7D_{11-46-40}................248
Description; D10B_{11-46-17}................249
General description-[4543]................250
3 - ELECTRICAL; WARNING; INFORMATION; INSTRUMENTS................251
30 - GENERAL................252
Description-[0333]................253
Operation................255
General-[0241]................256
31 - BATTERY................268
Description-[0151]................269
Specifications-[0125]................270
Non-maintenance batteries; testing................271
Explosion hazard................272
Battery box................273
32 - ALTERNATOR; CHARGE REGULATOR................274
Voltage regulator................275
Specifications-[5834]................276
Alternator; description................277
33 - STARTING SYSTEM................278
Specifications-[5704]................279
Starting system; general description................280
Neutral start relay................281
Electric air - preheater................282
35 - LIGHTING................283
General-[5512]................284
Lighting; front................285
Lighting; rear................286
Lighting; interior................287
Lighting; side................288
36 - OTHER ELECTRICAL EQUIPMENT................289
Description-[5255]................290
Direction indicator; turn signal................291
External warning system................292
Ignition switch................293
Automatic control_blocking function................295
37 - CABLE; FUSE; RELAY................297
Electrical symbols and designations................300
Description-[4735]................302
Cable; Battery isolation switch................303
Electrical component list................304
Wiring diagram 1 – Main diagram_Positive feeds_Chassis connections_{10-46-24}................311
Wiring diagram 1 – Main diagram_Positive feeds_Chassis connections_{10-46-00}................314
Wiring diagram 2 – Positive feed_Chassis connection I-ECU_E-ECU_{10-45-24}................317
Wiring diagram 2 – Positive feed_Chassis connection I-ECU_E-ECU_{10-45-00}................319
Wiring diagram 3 – Engine_{10-44-17}................321
Wiring diagram 3 – Engine_{10-43-52}................324
Wiring diagram 4 – D7 Engine ECU_{10-43-16}................327
Wiring diagram 4 – D7 Engine ECU_{10-42-52}................329
Wiring diagram 5 – D10 Engine ECU_{10-42-10}................332
Wiring diagram 5 – D10 Engine ECU_{10-41-46}................336
Wiring diagram 6 – D7; D10 Engine ECU_{10-41-10}................338
Wiring diagram 6 – D7; D10 Engine ECU_{10-40-45}................341
Wiring diagram 7 – Accelerator pedal_Fuel level_{10-40-10}................343
Wiring diagram 7 – Accelerator pedal_Fuel level_{10-39-45}................346
Wiring diagram 8 – Fan ECU_{10-39-03}................349
Wiring diagram 8 – Fan ECU_{10-38-36}................352
Wiring diagram 9 – Headlights_Turn signals_Horn_{10-37-59}................355
Wiring diagram 9 – Headlights_Turn signals_Horn_{10-37-34}................359
Wiring diagram 10 – EEC Headlights and flashers_{10-36-58}................362
Wiring diagram 10 – EEC Headlights and flashers_{10-36-33}................365
Wiring diagram 11 – Work lights_{10-35-45}................368
Wiring diagram 11 – Work lights_{10-35-21}................371
Wiring diagram 12 – EEC Worklights_{10-34-45}................374
Wiring diagram 12 – EEC Worklights_{10-34-20}................377
Wiring diagram 13 – Windshield wiper systems_{10-33-44}................380
Wiring diagram 13 – Windshield wiper systems_{10-33-19}................383
Wiring diagram 14 – 25 amp_60 amp converter_equalizer_{10-32-43}................387
Wiring diagram 14 – Rotating beacons_ Differential lock_MBCS_Articulation sensor_{10-32-19}................390
Wiring diagram 15 – Transmission ECU_{10-31-43}................393
Wiring diagram 15 – Rotating beacons_differential lock_MBCS_{10-31-18}................396
Wiring diagram 16 – AWD ECU_{10-30-42}................399
Wiring diagram 16 – Transmission ECU_{10-30-18}................402
Wiring diagram 17 – AWD ECU_{10-29-41}................406
Wiring diagram 17 – AWD ECU_{10-29-11}................410
Wiring diagram 18 – AWD ECU_{10-28-35}................414
Wiring diagram 18 – Sensors_{10-28-10}................419
Wiring diagram 19 – Sensors_{10-27-34}................422
Wiring diagram 19 – Brake circuit; lights_{10-27-10}................425
Wiring diagram 20 – Brake circuit; lights_{10-26-34}................428
Wiring diagram 20 – Secondary steering_{10-26-10}................431
Wiring diagram 21 – Climate control unit_{10-25-33}................434
Wiring diagram 21 – Secondary steering_{10-25-09}................438
Wiring diagram 22 – Front and rear defroster fans_{10-24-27}................441
Wiring diagram 22 – Climate control unit_{10-24-03}................444
Wiring diagram 23 – Front defroster fans_{10-23-12}................448
Wiring diagram 23 – Radio_Heated mirrors_{10-22-47}................451
Wiring diagram 24 – Blade float module_{10-22-12}................453
Wiring diagram 24 – Radio_Dome light_Heated mirrors_{10-21-47}................456
Wiring diagram 25 – Front float module_{10-20-59}................459
Wiring diagram 25 – Blade float module_{10-20-35}................462
Wiring diagram 26 – Tire pump_{10-19-59}................465
Wiring diagram 26 – Front float module_{10-19-35}................467
Wiring diagram 27 – Rear float module_{10-18-58}................470
Wiring diagram 27 – Communication; E-ECU_I-ECU_{10-18-34}................472
Wiring diagram 28 – Tire pump_Power outlet_{10-17-58}................475
Wiring diagram 28 – Keyboard_{10-17-33}................478
Wiring diagram 29 – Communication; E-ECU_I-ECU................480
Wiring diagram 30 – Keyboard................483
Electrical distribution box fuses; relays................485
Data link port................487
Ground stud - locations................488
38 - INSTRUMENT; SENSOR; WARNING & INFORMATION SYSTEM................496
Description-[1405]................497
Diagnostic software................513
Description of tests................514
4 - POWER TRANSMISSION................515
42 - TRANSMISSION; HYDRAULIC CONTROL................516
Specifications-[0514]................517
Description; 8400 transmission................519
Transmission components................522
Transmission ECU and shifter assembly................524
Transmission oil circuit and operation................527
Transmission hydraulic circuit and operation................532
Transmission troubleshooting................534
Error codes................538
Hydraulic system troubleshooting................541
Transmission; removing................547
Transmission; installing................551
44 - HYDROSTATIC DRIVE................555
Specifications; All Weel Drive system................556
Description; AWD system................557
AWD electrical system................566
AWD hydraulic system................574
All Wheel Drive Operational Checks................583
AWD test procedure and test port locations................585
AWD error codes and troubleshooting................590
All Wheel Drive Pump and Motor Priming Procedure................604
41 - CLUTCH; TORQUE CONVERTER................607
Specifications; engine clutch................608
Description and operation; engine clutch................610
Clutch housing; removing................614
Clutch assembly; removing................617
Clutch assembly; installing................619
Clutch housing; installing................621
Bearing support housing; installing................623
Clutch Slave Cylinder and Pedal Free Play; adjusting-[0737]................625
Clutch Slave Cylinder and Pedal Free Play; adjusting................628
Specifications; clutch master cylinder and booster circuit................630
Description; clutch master cylinder and booster................631
46 - FRONT AXLE; REAR AXLE................635
Specifications; SR final drive................636
Description; SR final drives................637
Operation; SR final drive................638
Lock_unlock function-[5319]................640
Final drive assembly; removing-[5253]................641
Tandem; removing-[5223]................643
Final drive assembly; installing-[5158]................644
Specifications; G780B - DR final drive................646
Description; G780B - DR final drive................647
Operation; G780B DR final drive................648
Lock_unlock function................650
Lubrication circuit................651
Final drive assembly; removing................652
Final drive assembly; installing................657
Specifications; tandems................662
Tandem assembly................663
Tandem; removing................665
Differential Lock; G710B - G746B................671
Differential Lock; G780B................673
5 - BRAKE................675
52 - HYDRAULIC BRAKE SYSTEM................676
Brake circuit hydraulic schematic - Image................677
Electrical schematic - Image................678
Specifications-[3651]................680
Description-[3625]................681
Brake master cylinder and power booster; removing................691
Power booster; disassembling................692
Power booster; assembling................694
Brake master cylinder; disassembling................696
Brake master cylinder; assembling................699
Brake master cylinder and power booster; installing................702
Adjustment checks................704
55 - PARKING BRAKE................706
Hydraulic diagram - Image................707
Electrical schematic - Image................708
Specifications-[3151]................709
Description-[3125]................711
Parking brake; manually releasing................713
Hydraulic diagram................715
Electrical schematic................718
Parking brake troubleshooting................720
Parking brake overhaul procedure................721
Parking brake assembly; removing................724
Parking brake; disassembling................725
Parking brake; pre-assembling................727
Parking brake; assembling................728
Parking brake; installing................730
Parking brake; adjusting................732
Parking brake intensifier................734
Parking brake valve assembly................736
50 - GENERAL................738
Overview................739
51 - WHEEL BRAKE................743
General-[4435]................744
Description-[4350]................745
Brake circuit hydraulic schematic................749
Electrical schematic-[4252]................751
Electric motor_pump troubleshooting................754
Oil disc brake assembly; removing................757
Oil disc brakes; disassembling................760
Oil Disc Brake - Cleaning and Inspection................766
Brake housing; pre-assembling................768
Tandem axle oil seal installation................770
Tandem axle seal; installing................772
Oil disc brakes ; assembling................778
Oil Disc Brakes - Bench Adjustment................783
Oil disc brake; installing................785
6 - STEERING................789
64 - STEERING................790
Steering hydraulic schematics - Image................792
Secondary steering hydraulic schematic - Image................793
Wheel lean hydraulic schematic - Image................794
Specifications-[0727]................795
Description-[0701]................796
Steering column; disassembling................798
Steering column; assembling................800
Steering Column - Cleaning and Inspection................801
Steering control unit; removing................802
Steering control unit; installing................803
Specifications-[0410]................804
Description-[0345]................805
Steering hydraulic schematics................806
Steering system troubleshooting guide................808
Steering control unit troubleshooting................810
Specifications-[0202]................813
Components-[0137]................814
Steering control unit overhaul procedure................816
Steering control unit; disassembling................817
Steering control unit; assembling................822
Steering Control Unit - Bleeding Procedure................828
Specifications-[5905]................829
Description-[5839]................830
Function-[5814]................832
Specifications-[5745]................834
General description................836
Secondary steering; specifications................837
Secondary steering; description................838
Secondary steering; component location................840
Secondary steering hydraulic schematic................843
Secondary steering troubleshooting................845
Hydraulic cylinder specifications................846
Description-[5347]................848
Wheel lean hydraulic schematic................850
62 - STEERING AXLE................852
Wheel hub; removing................854
Wheel hub; installing................856
Steering axle – Disassembly................858
Preparation and wheel; removing................859
Tie bar; removing................861
Tie bar; installing................862
Steering cylinder; removing................863
Steering cylinder; installing................865
Knuckle; removing................866
Knuckle; installing................867
Drag link; removing................868
Drag link; installing................870
Pivot block; removing and disassembling................871
Pivot block; assembling and installing................872
Wheel lean cylinder; removing................873
Wheel lean cylinder; installing................875
Front axle frame; removing................876
Front axle frame; installing................878
Wheel; installing................880
Axle disassembly and assembly - G780B................881
Front Axle Pivot Pin Bearings; disassembling................882
Front Axle Pivot Pin Bearings; assembling................884
King Pin Bearings and Spindle Thrust Bearing; disassembling................887
King Pin Bearings and Spindle Thrust Bearing; assembling................889
Wheel bearings; disassembling................891
Wheel bearings; assembling................893
Pivot Block Adjustments................895
Wheel Bearing; cleaning and inspecting................896
Spindle; removing and disassembling................898
Spindle; assembling and installing................900
Toe - in; adjustment_{09-08-43}................902
Toe - in; adjustment_{09-08-23}................903
60 - GENERAL................905
Steering system; description................906
Tightening torques-[2414]................909
Front axle toe-in-[2348]................910
Description-[2317]................911
Tightening torques-[2247]................916
Front axle toe-in................917
Front axle pivot (G710B to G746B)................918
7 - FRAME; SPRINGS; DAMPING; AXLE SUSPENSION; WHEEL_TRACK UNIT................919
77 - WHEELS; TRACKS; TYRE; HUB; DRUM................920
Wheels; specifications................921
General description – Wheels................922
Tire troubleshooting guide................924
74 - FRAME LINK................926
Tightening torques................927
Articulation hinge................928
Articulation hinge – Preparation for disassembly................931
Articulation hinge; disassembling................933
Cleaning and inspection................937
Articulation Hinge; assembling................938
Articulation hydraulics................942
Articulation Indicator - Setup and Adjustment................945
71 - FRAME................949
Description ................950
8 - MACHINERY HOUSE; CAB; EXTERIOR TRIM PARTS ANYWHERE................952
88 - INTERIOR EQUIPMENT................953
Description-[3707]................954
Control levers; disassembling................958
Control Levers - Cleaning and Inspection................961
Control levers; assembling................962
Pedestal Locking Strut - Setup................964
Locking Strut - Troubleshooting................965
87 - AIR CONDITIONING UNIT................966
Specifications-[4339]................967
Description-[4314]................969
Operating principle................970
HVAC system components................972
Cab air distribution_{08-41-46}................977
Cab air distribution_{08-41-22}................979
Basic operational checks................981
Air conditioning system................982
Climate control unit electrical schematic................983
Troubleshooting guide Low pressure gauge shown on left; high pressure gauge shown on right.................985
HVAC routine maintenance................988
Air conditioner service................990
Air Conditioning System Repairs................991
9 - HYDRAULIC SYSTEM; DIGGING_HANDLING_GRADING EQUIPMENT; MISCELLANEOUS................993
91 - WORKING HYDRAULIC; SERVO HYDRAULICS................994
Auxiliary control valves – Sheet 5 - Image................997
Auxiliary control valves – Sheet 5................998
Hydraulic Oil Filler Cap - Prevention of Contaminants................1000
Hydraulic oil cleanliness................1002
Specifications-[2709]................1008
Description-[2639]................1010
Main control valve spool flow rates................1011
Main control valve section................1013
Main control valve troubleshooting................1017
Main control valve overhaul procedure................1019
Main control valve; removing................1020
Main control valve; disassembling................1021
Valve section; disassembling................1023
Valve section; assembling................1026
Main control valve; assembling................1028
Main control valve; installing................1031
Main Control Valve Bleeding Procedure................1032
Specifications-[2202]................1034
Description-[2137]................1035
Hydraulic swivel joint; removing................1037
Hydraulic swivel joint; disassembling................1040
Hydraulic swivel joint; assembling................1043
Hydraulic swivel joint; installing................1046
Specifications-[1908]................1049
Description-[1843]................1050
Components................1051
Circle Turn Valve Overhaul Procedure................1054
Circle turn valve; removing................1055
Circle turn valve; disassembling................1057
Circle turn valve; assembling................1061
Circle turn valve; installing................1064
Circle Timing................1066
Specifications-[1513]................1069
Description-[1443]................1071
Specifications-[1418]................1072
Test procedures-[1353]................1073
Description-[1323]................1075
Function-[1258]................1076
Specifications-[1233]................1077
Test procedures................1078
Description-[1143]................1080
Function-[1118]................1081
Specifications-[1048]................1083
Description-[1018]................1085
Preventive maintenance................1086
Accumulator precharge pressure; checking................1087
Accumulator -Charging................1089
Accumulator precharge adjustment chart................1091
Specifications-[0832]................1092
Hydraulic Cylinder Overhaul Procedure................1094
Hydraulic cylinder; disassembling................1096
Hydraulic cylinder; assembling................1102
Special tools................1107
Specifications-[0616]................1108
General-[0551]................1109
Specifications-[0527]................1110
Function-[0502]................1111
Specifications-[0437]................1112
Description-[0412]................1113
Function................1114
Auxiliary load sense shuttle valve................1116
Counterbalance valve for attachments-[0257]................1117
Counterbalance valve for attachments................1118
Single attachment valve with relief (EEC)................1120
General-[0131]................1121
General................1122
Specifications-[0052]................1123
Specifications-[0027]................1125
Specifications-[5957]................1127
Description-[5913]................1128
Principle of operation; main hydraulic pump................1131
Principle of operation; pressure compensator control................1134
Hydraulic system; bleeding air................1138
Main hydraulic pump troubleshooting guide................1140
LS (load sense) pressure; checking................1142
Compensator Valve Pressure Setting - Checking................1144
LS (load sense) Differential Pressure - Checking................1145
90 - GENERAL................1148
Main hydraulic schematic - sheet 1 - Image................1149
Main hydraulic schematic; float valves – Sheet 2 - Image................1150
Main hydraulic schematic; EEC – Sheet 3 - Image................1151
Main hydraulic schematic; EEC float valves – Sheet 4 - Image................1152
Main hydraulic schematic - sheet 1................1153
Main hydraulic schematic; float valves – Sheet 2................1157
Main hydraulic schematic; EEC – Sheet 3................1160
Main hydraulic schematic; EEC float valves – Sheet 4................1163
Specifications-[3128]................1166
Description-[3103]................1167
Hydraulic components; location................1169
Hydraulic system troubleshooting guide................1172
92 - MECHANICAL EQUIPMENT_ATTACHMENT................1176
Specifications - ripper................1177
Description-[5517]................1178
Specifications - A-frame................1179
Description-[5432]................1180
Specifications - front mounted scarifier................1181
Specifications - mid mount scarifier................1182
Description-[5321]................1183
Specifications - windrow eliminator................1184
Specifications - utility dozer blade................1186
Description-[5211]................1187
Specifications - one way plow................1188
Description-[5126]................1189
Specifications - V-plow................1190
Description-[5035]................1191
Specifications - hydraulic snow wing................1192
Description-[4950]................1194
Specifications - push block................1196
Description-[4901]................1197
98 - FUNCTION FOR ROAD CONSTRUCTION................1198
Circle adjustment................1199
Pinion wear................1202
Specifications ................1203
Description ................1204
Circle operation................1207
Troubleshooting guide................1210
G710B to G746B circle and drawbar................1211
Circle and drawbar; removing and disassembling ................1212
Circle and drawbar; assembling and installing ................1215
Mouldboard; shimming ................1221
G780B circle and drawbar................1223
Circle and drawbar; removing and disassembling................1224
Circle and drawbar; assembling and installing................1226
Mouldboard; shimming................1230
Circle turn mechanism; disassembling................1231
Circle turn mechanism; assembling................1233
Drawbar ball stud; disassembling................1236
Drawbar ball stud; assembling................1237
Circle Setup and Timing................1238
Specifications................1240
Description................1241
Blade lift cylinder; removing................1245
Blade lift stirrup; removing................1247
Blade lift arm; removing................1248
Blade lift arm; installing................1250
Blade lift stirrup; installing................1251
Blade lift cylinder; installing ................1252
Volvo G726 VHP, G726B Motor Graders Repair & Service Manual
