Part of the Hyundai Repair Manuals.
Put the factory in your toolbox: this Hyundai Robex 22-7 Service Manual PDF packs 120 pages of crawler excavator service data into one download. Inside: a full troubleshooting section for the travelling, slewing, boom, and swing systems, plus performance test procedures for the main pump. You also get disassembly and assembly steps for the control valve, slew and travel motors, hydraulic cylinders, swivel joint, and the complete crawler undercarriage (idlers, sprockets, track rollers, spring case). Real numbers, too. The hydraulic system holds 33 liters total; set the overload relief valve to 11.8 MPa and keep oil temperature inside the -20°C to 120°C window. Tired of translating forum guesses into torque wrench settings? Bookmarked and text-searchable, this PDF opens on your phone, tablet, or laptop, so walk it out to the machine and start wrenching.
What's Inside This Hyundai R22-7 Manual
| System | Pages | Key Topics |
|---|---|---|
| Precautions on Maintenance | 6 | Correct Operation, Precautions on Operation, Safety Check, Preparation, Disassembly, Assembly |
| Outline | 7-24 | Location of Serial No, Name of Each Part, Dimensions and Specification, Weight List, Oil and Grease Supply Points, List of Supply Oil and Grease, When to Repair |
| Attachment | 25-32 | Standard of Maintenance, Inspection and Adjustment, Natural Fall of Attachment, Speed of Attachment Cylinder |
| Engine | 33-36 | Specification, Performance Curve, Location of Serial Number, Standard Engine Speed |
| Main Pump | 37-44 | Specification, Structure, Removing and Installing the Pump, Performance Test of the Hydraulic Pump |
| Hydraulic Oil Filter | 45-50 | Installation, Line Filter, Suction Filter, Pilot Filter, Maintenance Procedure |
| Control Valve | 51-58 | Specification, Disassembly and Assembly, Structure of the Relief Valve, Precautions for Handling |
| Joystick | 59-61 | Pilot Valve Specification, Single- and Double-Operating Torque, Secondary Pressure, Port Plate and Structure |
| Slew Motor | 62-67 | Specification, Structure, Standard of Maintenance of the Slew Bearing and Slew Case, Measuring Natural and Over-Slew Distance, Measuring Slewing Time |
| Travel Motor | 68-73 | Specification, Structure, Operation, Handling, Inspection, Adjustment |
| Hydraulic Cylinder | 74-79 | Structure, Disassembly Procedure, Disassembling Inner Parts, Assembly and Inspection Procedure, Precautions for Assembly |
| Swivel Joint | 80-83 | Specification and Structure, Disassembly and Assembly |
| Crawler | 84-91 | Structure, Operation, Standard of Maintenance, Disassembly, Assembly, Handling |
| Spring Case and Grease Cylinder | 92-95 | Structure, Specification of Spring, Disassembling and Assembling the Adjust Cylinder, Disassembling and Assembling the Grease Cylinder |
| Idler | 96-97 | Standard of Maintenance, Idler Tooth Width, Minor Diameter and Tooth Count, Lubricating Oil Grade and Quantity, Pad or Replace Wear Limits |
| Sprocket | 98-101 | Removing the Sprocket, Installing the Sprocket, Standard of Maintenance and Wear Limits |
| Track Roller | 102-103 | Standard of Maintenance, Roller Outer Diameter (Projected Part and Tread), Overall and Tread Width Limits, Mounting Bolt Tightening Torque, Lubricating Oil Quantity |
| Electrical Equipment | 104-107 | Electric Circuit Diagram, Starter System, Alternator System |
| Troubleshooting | 108-120 | Travelling System, Slewing System, Boom System, Swing System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic tank capacity | 33 L | p. 14 |
| Weight | 15kg | p. 38 |
| Oil temperature | -20°C to 120°C | p. 47 |
| Total amount of hydraulic oil | 33 L | p. 49 |
| Overload relief set pressure | 11.8MPa | p. 63 |
| Tightening torque for M10x60 bolt | 80Nm | p. 65 |
| Tightening torque for M12x40 bolt | 130Nm | p. 65 |
| Working pressure | 18.6 MPa | p. 69 |
| Glow timer | 3 seconds | p. 104 |
| Engine Rated Output | 12.5 kW | p. 11 |
| Hydraulic Oil Capacity | 33.0 L | p. 11 |
| Fuel Capacity | 29.0 L | p. 11 |
Hyundai R22-7 Common Problems This Manual Covers
Hyundai Robex 22-7 hydraulic pump whining under load, boom and bucket feel weak and slow
Check the hydraulic tank level first; the system holds 33 L total, and low oil aerates the pump intake fast. Drain and inspect the suction filter, covered on page 45, for a clogged screen. Test main relief pressure against the 18.6 MPa spec, then follow the weak-power chart on page 109 if pressure holds.
Manual Section: General Troubleshooting p. 109Engine cranks but won't start, glow plug light acts up in cold weather
Verify battery voltage and clean any corroded terminals before condemning the starter. Listen for the glow timer relay after key-on; it should cycle for 3 seconds. Trace the starter circuit against the electric circuit diagram on page 104, then work through the starter and alternator system checks in that same section.
Manual Section: Electrical Equipment p. 104Machine pulls to one side, travel meanders and won't hold position on an incline
Check travel motor gear oil first; each side takes 330 cm3, and a dry case drags one track. Inspect and adjust the travel motor per the handling steps starting on page 68, and retorque loose sprocket mounting bolts to 72 N-m. Then run the meander and incline checks in the travelling system troubleshooting chart.
Manual Section: Travelling System Troubleshooting p. 68Boom drifts down overnight, slow lift and lacks power with a loaded bucket
Measure natural fall of the attachment against the standards starting on page 25 before condemning parts. Test main relief pressure at 18.6 MPa; low pressure points to the pump, on-spec pressure points to cylinder seals or a leaking control valve section, covered on page 51. Replace scored cylinder seals as a complete set.
Manual Section: Boom System Troubleshooting p. 25Tracks keep walking off the rollers, front idler and sprocket wearing out fast
Check track tension before anything else; slack tracks derail on turns and chew the sprocket. Inspect the front idler for flat spots and confirm its case holds 40 cm3 of lubricating oil. Follow the crawler maintenance standards starting on page 84, then measure idler and roller wear against the limits on pages 96 and 102.
Manual Section: Crawler p. 84Frequently Asked Questions
What are the torque specifications for the track adjuster bolts on a Hyundai Robex 22-7?
The tightening torque for the sprocket mounting bolt is 72 N-m, and the motor mounting bolt is also 72 N-m. These specifications are for M10 P1.5 bolts. p. 100
What are the replacement specifications for the hydraulic pump assembly?
The hydraulic pump assembly is model PVD-08-20L3PS-6G-4920A. When installing the pump, the tightening torque for the M12 x 30 bolts is 9 to 11.5 kg-m. p. 40
What is the total hydraulic oil capacity for the Robex 22-7?
The total capacity of the hydraulic oil system is 33 liters. p. 49
What is the standard engine speed for the Robex 22-7 at new machine delivery?
At new machine delivery, the maximum idling speed is 2,550 min-1, and the speed when 1P relief is used is 2,450 min-1. p. 36
What is the correct fan belt tension for the Robex 22-7?
The fan belt should be checked and adjusted to have a 10 to 12 mm sag at the center. p. 17
Is this Hyundai Robex 22-7 manual a download or a disc?
A single searchable PDF file of 120 pages, downloadable right after payment. Nothing ships, nothing waits in the mail.
Is this Hyundai Robex 22-7 Service Manual printable?
Printing is allowed without restriction. Pull the pages you need for the job and bin them when they get greasy.
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