Part of the Hyundai Repair Manuals.
Need factory data for your R35Z-7 mini excavator? This 415-page Hyundai R35Z-7 service manual PDF covers the whole machine: pump device, main control valve, swing and travel devices, RCV lever, turning joint, and undercarriage. Inside you get full hydraulic circuit schematics with main and pilot circuit routing, complete electrical wiring diagrams with connector pinouts, and a troubleshooting section that walks both hydraulic and electrical faults. A full disassembly and assembly section pairs with component mounting torque tables for the engine, structure, and work equipment. Set travel motor braking torque at 6.5 kgf·m (47 lbf·ft), then swap the hydraulic return filter every 500 hours with a 10-micron element. Your excavator is down and every idle hour costs money. Bookmarked chapters and a live text layer mean you search a spec, find it, and get back to wrenching.
What's Inside This Hyundai R35Z-7 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 11-31 | Safety Hints, Specifications |
| Structure and Function | 32-102 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever |
| Hydraulic System | 103-133 | Hydraulic Circuit, Main Circuit, Pilot Circuit, Single Operation, Combined Operation |
| Electrical System | 134-182 | Component Location, Monitoring System, Electrical Circuit |
| Troubleshooting | 183-220 | Before Troubleshooting, Hydraulic and Mechanical System |
| Maintenance Standard | 221-259 | Operational Performance Test, Major Components, Track and Work Equipment |
| Disassembly and Assembly | 260-404 | Precaution, Tightening Torque, Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Turning Joint |
| Component Mounting Torque | 405-415 | Introduction Guide, Engine System, Electric System, Undercarriage, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Braking torque (travel motor) | 6.5kgf·m (47lbf·ft) | p. 30 |
| Battery | 1 × 12V × 55Ah(5h rating) | p. 29 |
| Starting motor | 12V-1.2kW | p. 28 |
| Filter filtration accuracy | 10 μm or less | p. 38 |
| Filter change interval | 500 hours | p. 39 |
| Pilot relief valve setting pressure | 30kgf/cm2 | p. 108 |
| Swing motor mounting bolt (M14 × 2.0) | 19.6 ± 2.9 kgf·m (142 ± 21.0 lbf·ft) | p. 264 |
| Travel motor mounting bolt (M12 × 1.75) | 13.8 ± 2.0 kgf·m (100 ± 14.0 lbf·ft) | p. 264 |
| Counterweight mounting bolt (M20 × 2.5) | 57.8 ± 6.4 kgf·m (418 ± 46.3 lbf·ft) | p. 264 |
| Operating weight | 3650 kg | p. 21 |
Hyundai R35Z-7 Common Problems This Manual Covers
Hyundai R35Z-7 hydraulic pump whining or growling at idle, bucket and arm feel slow
Check the hydraulic tank oil level first; low oil pulls air into the suction line and makes the pump cavitate. Clean the tank suction strainer and bleed the system, then follow the pump noise procedure on page 188. Change the return filter, rated 10 microns or less, every 500 hours to keep the suction side clean.
Manual Section: Drive System Troubleshooting p. 188Engine oil pressure warning lamp comes on after warm-up or when engine is revved
Check engine oil level and condition first; the crankcase holds 6.7 L per page 28. Replace a clogged oil filter cartridge and inspect every pipe joint for seepage. If the oil side checks out, test the lamp circuit on page 211; circuit resistance should read 1 ohm maximum. Replace the pressure sender if readings fall outside that spec.
Manual Section: Electrical System Troubleshooting p. 211Starter will not crank or turns over slowly when key is turned to START
Check the battery with a load tester before touching anything else; this machine carries one 12V, 55Ah battery, and a weak cell mimics a dead starter. Verify 12V at the safety relay coil, spec on page 163, then trace the start circuit on the wiring diagram, page 158. If both pass, bench test the 12V, 1.2 kW starting motor.
Manual Section: Electrical System Troubleshooting p. 163Travel feels weak and machine pulls to one side on flat ground
Check hydraulic oil level and change overdue filters before condemning hardware. Test travel relief pressure; it should hold 230 kgf/cm2 on both sides. If one track drags, inspect the travel motor parking brake; braking torque spec is 6.5 kgf·m (47 lbf·ft) on page 30. Uneven relief settings between the two circuits will steer the machine off line.
Manual Section: Travel System TroubleshootingSwing is sluggish and upper structure drifts when parked across a slope
Check swing relief pressure first; spec is 200 kgf/cm2 on page 29. Low relief pressure or a worn swing motor lets the house drift under load. Inspect the swing motor case for external leaks, and if you pull the motor, torque the mounting bolts to 19.6 kgf·m per page 264. Bleed the swing circuit after any repair.
Manual Section: Swing System TroubleshootingFrequently Asked Questions
What are the torque specifications for the Hyundai R35Z-7 travel motor mounting bolts?
The torque specification for the travel motor mounting bolts (M12 x 1.75) is 13.8 ± 2.0 kgf·m (100 ± 14.0 lbf·ft). p. 264
What is the standard engine oil quantity for the Yanmar 3TNV88 engine?
The standard engine oil quantity for the Yanmar 3TNV88 engine is 6.7 liters (1.8 U.S. gal). p. 28
What is the procedure for bleeding air from the hydraulic pump after installation?
To bleed air from the hydraulic pump, remove the air vent plug (1EA), tighten it lightly, start the engine at low idling, check that oil comes out from the plug, and then tighten the plug fully. p. 268
What is the tightening torque for the main relief valve on the main control valve?
The tightening torque for the main relief valve (14) on the main control valve is 6 kgf·m (43.4 lbf·ft). p. 305
What is the standard clearance between the piston outside diameter and cylinder block inside diameter for the main pump?
The standard clearance between the piston outside diameter and the cylinder block inside diameter for the main pump is D-d ≤ 0.050mm. p. 242
What do I get after purchasing this Hyundai R35Z-7 manual?
This is a 415-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print this Hyundai R35Z-7 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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