Part of the Hyundai Repair Manuals.
Every one of the 142 pages in this Hyundai Robex 35-7 Service Manual PDF covers one machine: the Robex 35-7 crawler excavator, from main pump to track rollers. You get a full hydraulic schematic plus a wiring diagram for the electrical system, disassembly and assembly steps for the control valve, slew motor, travel motor, and hydraulic cylinders, and troubleshooting charts for both the travelling and slewing systems. Inside: maintenance standards for the idler, sprocket, and every roller on the undercarriage, so you know exactly when a worn part is out of tolerance. Torque the M8 (10.9) body bolts to 39 N-m and the M6 (8.8) hardware to 12.5 N-m; confirm the 12V, 60 AH battery before blaming the starter. No more crawling forums for mini-excavator specs. Bookmarked with a real text layer: jump to a section, search a spec, get wrenching.
What's Inside This Hyundai Robex 35-7 Manual
| System | Pages | Key Topics |
|---|---|---|
| Precautions on Maintenance | 6 | - |
| Outline | 7-24 | Location of Serial Number, Name of Each Part, Dimensions and Specifications |
| Attachment | 25-32 | Standard of Maintenance |
| Engine | 33-44 | Inspection and Maintenance Procedures |
| Main Pump | 45-52 | Removing and Installing the Pump, Performance Test |
| Hydraulic Oil Filter | 53-58 | Hydraulic Oil Filter Specifications, Maintenance Procedure |
| Control Valve | 59-66 | Disassembly and Assembly, Structure of Relief Valve |
| Joystick (Pilot Valve) | 67-69 | - |
| Pilot Valve (1) (Travel) | 70-73 | - |
| Pilot Valve (2) (Swing, PTO) | 74-77 | - |
| Pilot Valve (3) (Dozer) | 78-81 | - |
| Slew Motor | 82-87 | - |
| Travel Motor | 88-93 | Handling the Travel Motor |
| Hydraulic Cylinder | 94-99 | Disassembly and Assembly, Assembly Procedures |
| Swivel Joint | 100-103 | Disassembly and Assembly |
| Crawler | 104-111 | Structure and Operation, Standard of Maintenance, Disassembly and Assembly |
| Spring Case and Grease Cylinder | 112-115 | - |
| Idler | 116-117 | - |
| Sprocket | 118-121 | Disassembly and Assembly, Standard of Maintenance |
| Track Roller | 122-123 | - |
| Carrier Roller | 124-125 | - |
| Electrical Equipment | 126-129 | Structure and Function, Failure and Remedy |
| Troubleshooting | 130-142 | Travelling System Troubleshooting, Slewing System Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Tightening torque of the bolt and nut (Body) M6 (8.8) | 12.5 Nm | p. 19 |
| Tightening torque of the bolt and nut (Body) M6 (10.9) | 16 Nm | p. 19 |
| Battery | 12V × 60 AH | p. 34 |
| Starter | 12V × 1.7 kW | p. 34 |
| Generator | 12V × 50A | p. 34 |
| Line filter (SP08) tightening torque | 20 N·m | p. 56 |
| Pilot filter tightening torque | 60~80 N·m | p. 56 |
| Main relief valve pressure adjustment | 17.7 MPa per rotation | p. 66 |
| Port relief valve pressure adjustment | 15.7 MPa per rotation | p. 66 |
| Engine Rated Power | 19.9 kW | p. 11 |
| Hydraulic Oil Tank Capacity | 50.5 L | p. 11 |
| Fuel Tank Capacity | 42 L | p. 11 |
Hyundai Robex 35-7 Common Problems This Manual Covers
Hyundai Robex 35-7 hydraulic functions slow and weak, boom hesitates and digging power drops
Test main relief pressure with a gauge on P1 and P2; you want 20.6 MPa per the control valve specs on page 60. Adjust carefully, one full rotation changes pressure by 17.7 MPa, then torque the cap nut to the value in the control valve section. If pressure stays low, pull and inspect the suction filter.
Manual Section: General Troubleshooting p. 131Engine won't start or cranks weakly, starter clicks but pinion won't engage
Load test the battery first; this machine runs a 12V, 60 AH unit and the 1.7 kW starter needs full voltage to spin. Clean and tighten both cable ends and the frame ground strap. If it still clicks, work through the starter failure chart in the electrical section starting on page 126.
Manual Section: Starter System Failure and Remedy p. 126Engine overheats and loses power under load, temperature gauge climbs on long digs
Check coolant level cold; top up any shortfall to the coolant capacity in the specifications and find where it went. Blow out the radiator fins from the fan side and swap the air filter element. While you're in there, change the engine oil to the specified capacity, and torque the drain plug to 39 N·m per page 43.
Manual Section: Engine p. 33Machine meanders at slow travel speed, one crawler drags, hesitates, or makes grinding noise
Check track tension first and adjust at the grease cylinder, covered in the crawler section starting on page 104. Drain the lagging side's travel motor and refill with the gear oil quantity given in the travel motor section. If one side still drags, swap the travel hoses side to side to isolate motor from valve.
Manual Section: Travelling System Troubleshooting p. 130Boom drops slowly under load with controls in neutral, cylinder won't hold overnight
Check the boom circuit port relief valve; adjustment runs 15.7 MPa per rotation, detailed on page 66, and the cap nut gets torqued to the control valve section value afterward. If drift continues, pull the boom cylinder and inspect the piston seals using the disassembly procedure in the hydraulic cylinder section on page 94.
Manual Section: Boom System Troubleshooting p. 130Frequently Asked Questions
What are the hydraulic pressure settings for a Hyundai Robex 35-7?
The main relief pressure for P1 and P2 is 20.6 MPa at 42 l/min, while the P3 main relief pressure is 17.2 MPa at 25 l/min. Port relief pressure for A2, B2, A5, and B5 is 23.5 MPa at 5 l/min. p. 60
What is the torque specification for the track motor bolts on a Hyundai Robex 35-7?
The tightening torque for the motor mounting bolts is 110 N·m. p. 91
What is the engine valve clearance specification for the Hyundai Robex 35-7?
The valve clearance for both inlet and exhaust valves should be adjusted to 0.25 mm (0.0098 in) when the engine is cold. p. 37
What is the capacity of the hydraulic oil tank?
The total capacity of the hydraulic oil tank is 50.5 liters. p. 11
What is the tightening torque for the cylinder head bolts?
The cylinder head bolts should be retightened to a specified torque of 9 ± 0.5 kgf·m (88 ± 5 N·m). p. 37
What exactly do I receive with this Hyundai Robex 35-7 Service Manual?
Straight to your device: 142 pages of searchable Service Manual, downloadable the moment payment goes through.
Can I print specific sections of this Hyundai Robex 35-7 Service Manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
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