Part of the Hyundai Repair Manuals.
All 138 pages of this Hyundai R36N-7 (Robex 36N-7) Service Manual PDF cover one machine: the R36N-7 hydraulic excavator, from main pump to track roller. Inside: a full hydraulic circuit diagram, an electric circuit diagram for chasing starter and alternator faults, and page after page of disassembly and assembly procedures for the control valve, slew motor, travel motor, and hydraulic cylinders. You also get a complete troubleshooting section that walks through weak operating power, dead boom and arm functions, and travel and slewing problems. Set both main relief valves to 20.6 MPa, then torque the port relief valve cap nut to 30 N-m when you button the control valve back up. No more chasing hydraulic faults with a gauge and a hunch. The PDF is bookmarked with a live text layer; search any spec, jump straight to your section, and get wrenching.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Precautions on Maintenance | 6 | Correct Operation, Precautions on Operation, Safety Check, Preparation, Efficiency, Assembly |
| Outline | 7-24 | Location of Serial Number, Name of Each Part, Dimensions and Specification, Weight List, Oil and Grease Supply Points, Hydraulic Circuit Diagram |
| Attachment | 25-32 | Standard of Maintenance, Inspection and Adjustment, Measuring the Fall of the Attachment, Measuring the Speed of the Attachment Cylinder |
| Engine | 33-44 | Specification, Performance Curve, Location of Serial Number, Standard Engine Speed, Inspection and Maintenance Procedures |
| Main Pump | 45-52 | Specification, Structure, Removing and Installing the Pump, Performance Test of the Hydraulic Pump, P-Q Characteristic Curve |
| Hydraulic Oil Filter | 53-58 | Installation, Line Filter, Suction Filter, Pilot Filter, Maintenance Procedure |
| Control Valve | 59-66 | Specification, Disassembly and Assembly, Structure of the Relief Valve, Precautions for Handling |
| Joystick (Pilot Valve) | 67-69 | Specification, Secondary Pressure and Push-Rod Stroke, Single- and Double-Operating Torque, Port Plate and Structure |
| Pilot Valve (1) (Travel) | 70-73 | Specification, Structure and Exploded View with Numbered Part Callouts |
| Pilot Valve (2) (Dozer) | 74-77 | Specification with Secondary Pressure and Operating Torque Curves, Structure and Exploded View |
| Slew Motor | 78-83 | Slew Bearing and Slew Case Wear Limits, Measuring Natural Slew Distance, Measuring Over-Slew Distance After Stopping, Measuring Required Slewing Time, Motor Specification and Structure |
| Travel Motor | 84-89 | Handling the Travel Motor, Measuring Travel Motor Idling, Motor Specification and Structure, Inspection and Adjustment |
| Hydraulic Cylinder | 90-95 | Structure, Disassembly Procedure, Disassembling Inner Parts, Assembly and Inspection Procedure |
| Swivel Joint | 96-99 | Specification and Structure, Disassembly and Assembly |
| Crawler | 100-107 | Structure and Operation, Standard of Maintenance, Disassembly and Assembly |
| Spring Case and Grease Cylinder | 108-111 | Structure, Specification of Spring, Disassembly and Assembly |
| Idler | 112-113 | Standard of Maintenance, Outer Diameter of Tread, Width of Projected Part, Overall and Tread Width, Lubricating Oil Grade and Quantity |
| Sprocket | 114-117 | Disassembly and Assembly, Removing the Sprocket, Installing the Sprocket, Standard of Maintenance |
| Track Roller | 118-119 | Standard of Maintenance, Outer Diameter of Projected Part and Tread, Overall and Tread Width, Mounting Bolt Tightening Torque, Lubricating Oil Quantity |
| Carrier Roller | 120-121 | Standard of Maintenance, Outer Diameter, Overall Width, Mounting Bolt Tightening Torque, Lubricating Oil Quantity |
| Electrical Equipment | 122-125 | Structure and Function, Electric Circuit Diagram, Failure and Remedy, Starter System, Alternator System |
| Troubleshooting | 126-138 | All Functions Not Operational, Operation Power Is Weak, No Operation on Boom, Arm, Bucket and Slewing, Travelling System, Slewing System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main relief P1 | 20.6 MPa | p. 24 |
| Main relief P2 | 20.6 MPa | p. 24 |
| Pump capacity P1 | 17.5 cc/rev | p. 24 |
| Pump capacity P2 | 17.5 cc/rev | p. 24 |
| Port relief valve cap nut tightening torque | 30 N·m | p. 65 |
| Port relief valve installation torque | 70 N·m | p. 65 |
| Line filter (only P.T.O return) tightening torque | 20 N·m | p. 56 |
| Pilot filter tightening torque | 60-80 N·m | p. 56 |
| Tightening torque of sprocket mounting bolt | 100 N·m ~ 110 N·m | p. 115 |
| Tightening torque of motor mounting bolt | 100 N·m ~ 110 N·m | p. 115 |
| Engine Rated Output | 19.9 kW (27.0 PS) / 2400 min-1 | p. 11 |
| Hydraulic Tank Capacity | 42.0 L | p. 11 |
