Part of the Hyundai Repair Manuals.
All 149 pages of this Hyundai R75-7 (R75-7) service manual PDF cover one machine: the R75-7 hydraulic excavator, from main pump to track rollers. Inside you get full hydraulic circuit diagrams, electrical wiring schematics, and a fat troubleshooting section that walks failure to remedy for every system on the machine. Exploded views back up step-by-step teardown procedures for your control valve, slew motor, travel motor, cylinders, swivel joint, and the entire undercarriage. Torque the M8 body bolts to 30 N·m, the 3/8 PT hydraulic fittings to 55 N·m, and refill each track roller with 80 cc of oil before it runs dry. No more chasing hydraulic leaks with forum guesses. This bookmarked PDF has a real text layer: type a spec, jump straight to the section, and get your excavator digging again.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Precautions on Maintenance | 6 | Correct Operation, Safety Check, Preparation, Disassembly, Assembly |
| Outline | 7-26 | Serial Number, Name of Parts, Dimensions, Weight List, Oil and Grease Supply, Hydraulic Circuit Diagram |
| Attachment | 27-34 | Measuring the Natural Fall of the Attachment, Measuring Attachment Cylinder Speed, Standard of Maintenance |
| Engine | 35-46 | Specification, Inspection and Maintenance Procedure |
| Main Pump | 47-54 | Removing and Installing the Pump, Performance Test |
| Hydraulic Oil Filter | 55-60 | Hydraulic Oil Filter Specifications, Maintenance Procedure |
| Control Valve | 61-68 | Disassembly and Assembly, Structure of the Relief Valve |
| Joystick | 69-72 | Secondary Pressure and Pusher Stroke, Specification and Structure |
| Pilot valve(1)(Travel) | 73-76 | Travel Pilot Valve Secondary Pressure, Travel Operating Torque and Angle, Pusher Assembly and Structure |
| Pilot valve(2)(Swing.PTO) | 77-80 | Swing and PTO Pilot Valve Secondary Pressure, Swing Operating Torque and Angle, Pusher Assembly and Structure |
| Pilot valve(3)(Dozer) | 81-84 | Secondary Pressure, Operating Torque and Operating Angle, Spring Compression, Spring Pin and Pusher Assembly |
| Slew Motor | 85-90 | Slew Bearing and Slew Case Wear Limits (Tightening Torque 340 N.m), Measuring Natural Slew Distance, Measuring Over-Slew Distance After Stopping, Measuring Required Slewing Time |
| Travel Motor | 91-96 | Handling the Travelling Motor, Inspection and Adjustment |
| Hydraulic Cylinder | 97-102 | Disassembly and Assembly, Assembly Procedure |
| Swivel Joint | 103-106 | Specification and Structure, Disassembly and Assembly |
| Crawler | 107-114 | Crawler (Steel) and Track Frame, Rubber Crawler Total Length, Width X Pitch and Set Length, Removing and Installing the Crawler, Track Frame Spring |
| Spring Case and Grease Cylinder | 115-120 | Specification of Spring (Set Length 321 Mm, Coil Count, Spring Constant, Set Force), Disassembling the Adjust Cylinder, Disassembling the Spring Assembly |
| Idler | 121-122 | Standard of Maintenance, Idler Specification |
| Sprocket | 123-126 | Removing and Installing the Sprocket (Tightening Torque 200 N.m), Width of Sprocket Teeth, Minor Diameter Wear Limit |
| Track Roller | 127-130 | Standard of Maintenance, Track Roller (Steel), Track Roller (Rubber) |
| Carrier Roller | 131-132 | Standard of Maintenance, Bolt, Lubricating Oil |
| Electrical Equipment | 133-136 | Failure and Remedy |
| Troubleshooting | 137-149 | Troubleshooting Procedures |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Tightening torque of the bolt and nut (Body) M6 (8.8) | 12.5 N·m | p. 20 |
| Tightening torque of the bolt and nut (Body) M8 (8.8) | 30 N·m | p. 20 |
| Track roller oil quantity | 80 cc | p. 16 |
| Track roller oil supply quantity | 100 cc | p. 23 |
| Front idler oil quantity | 70 cc | p. 16 |
| Front idler oil supply quantity | 100 cc | p. 23 |
| Battery | 12V x 92AH(5HR) | p. 35 |
| Starter | 12V x 3.0 kW | p. 36 |
| Starter B terminal tightening torque | 9.8-11.8 N·m | p. 45 |
| Line filter (SP10) tightening torque | 20 N·m | p. 57 |
| Pilot filter tightening torque | 60 N·m - 80 N·m | p. 58 |
| Engine Rated Power | 40.8 kW / 2300 min-1 | p. 12 |
