Part of the Yanmar Repair Manuals.
Put a gauge on the P1 test port and you need one number before you touch the relief valve: 2986 PSI (20.6 MPa). Guess at it and you either starve every cylinder on the machine or work the pump against a setting it was never meant to hold. This Yanmar service manual gives you the verified figure, and the measurement procedure that goes with it.
It covers the ViO30-2 and ViO35-2 compact excavators and the 3TNE82A-EBVC diesel that powers both, across 477 pages: disassembly and reassembly cautions, service standards for the engine, undercarriage, controls and hydraulic equipment, fuel injection and electrical procedures, and hydraulic circuit schematics with circuit operation and pressure adjustment.
Because it is a PDF download, it rides along on a phone or laptop, or as printed pages in the toolbox, so the answer is wherever the machine is parked, not back at the shop.
What's Inside This Yanmar ViO30-2, ViO35-2 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | - | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | - | - |
| Service Standards | - | Machine Performance, Engine, Undercarriage, Controls, Hydraulic Equipment, Implement |
| Engine | - | Measurement, Inspection and Adjustment, Measurement Procedure, Service Data and Corrective Action, Precautions for Reassembly, Fuel Injection System, Electrical Equipment |
| Hydraulic System | - | Outline, Hydraulic Circuit Schematic, Circuit Operation, Pressure Adjustment |
| Hydraulic Circuit Schematic | - | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| ViO30-2 | ||
| Boom cylinder U nut tightening torque | 759.5 to 831.9 ft•lbf (1030 to 1130 N•m) | p. 65 |
| Oil seal after press-fitting dimension | 0.177 in. (4.5 mm) | p. 265 |
| Boom speed (Up) allowance | 2.3 sec | p. 49 |
| ViO35-2 | ||
| Travel motor × Track frame (ViO35-2) bolt tightening torque | 57.9 to 72.3 ft•lbf (78.5 to 98.1 N•m) | p. 71 |
| All Models | ||
| Hose clip 16 tightening torque | 1.81 to 2.52 ft•lbf (2.45 to 3.4 N•m) | p. 71 |
| Hose clip 60 & 70 tightening torque | 3.62 to 4.34 ft•lbf (4.9 to 5.88 N•m) | p. 71 |
| Hose clip 70, 48 tightening torque | 1.45 to 2.17 ft•lbf (1.96 to 2.94 N•m) | p. 334 |
| Oil seal capacity to resist pressure | 42.7 PSI (0.3 MPa) | p. 181 |
| V-belt slack | 0.39 to 0.59 in. (10 to 15 mm) | p. 79 |
| Battery type | 65B24L | p. 37 |
| Battery voltage - 5 hrs rate capacity | 12-40 V-Ah | p. 37 |
| Battery cable terminals Nut M6 tightening torque | 2.17 to 2.89 ft•lbf (2.94 to 3.92 N•m) | p. 70 |
Yanmar ViO30-2, ViO35-2 Common Problems This Manual Covers
Weak or slow hydraulics after warm-up
When boom and arm speed fall off once the oil is hot, the cause is usually low or aerated oil, a leaking circuit, or pressure that has drifted. The Hydraulic System section covers circuit operation and pressure adjustment, so you can test against the 2986 PSI (20.6 MPa) relief setting instead of guessing.
Manual Section: Hydraulic SystemEngine overheating and coolant loss
Coolant hoses and clamps on a machine that lives on hour meters, not calendars, dry out and seep long before they burst. The Engine section gives measurement, inspection and adjustment procedures with service data and corrective actions, so you can catch a cooling problem before it takes the head with it.
Manual Section: EngineFan belt slippage and charging trouble
A loose V-belt shows up as squeal at throttle, a weak battery, or creeping coolant temperature. The manual specifies belt slack of 0.39 to 0.59 in. (10 to 15 mm), so tensioning is a measurement, not a feel.
Manual Section: EngineOil leaks at seals and joints
Leaks around shafts and hydraulic joints often trace back to a seal that was nicked or pressed in dry during a previous repair. The General Cautions for Maintenance Work section covers seal handling and the removal and installation of hydraulic equipment and piping, which is where most reseal jobs go wrong.
Manual Section: General Cautions for Maintenance WorkUneven travel or one weak track
When the machine pulls to one side under travel, the fault can sit anywhere from the travel circuit to a worn final drive. The Service Standards section lists undercarriage and controls figures, giving you hard limits to judge wear against before you commit to tearing anything down.
Manual Section: Service StandardsSlow boom cycle times
Timing the boom is the quickest health check on the whole hydraulic side. The Service Standards machine performance data lists boom up at 2.0 seconds standard with a 2.3 second allowance on the ViO30-2, and 1.9 with a 2.2 allowance on the ViO35-2, so a stopwatch tells you whether the machine is actually down on power.
Manual Section: Service StandardsFrequently Asked Questions
Which machines and engine does this manual cover?
It covers the Yanmar ViO30-2 and ViO35-2 compact excavators, both powered by the 3TNE82A-EBVC diesel rated 24.7 HP at 2500 rpm. Where the two models differ, such as swing motor displacement and cylinder torques, the manual gives separate figures for each.
Does it include hydraulic pressure adjustment procedures?
Yes. The Hydraulic System section covers the circuit schematic, circuit operation, and pressure adjustment, and the manual lists the system relief set pressure for P1, P2, and P3 at 2986 PSI (20.6 MPa). p. 26
Are tightening torque specifications included?
Yes. Torque tables run from engine fasteners, such as cylinder head bolts at 49.2 to 52.1 ft·lbf, to implement hardware like the boom cylinder U-nut at 759.5 to 831.9 ft·lbf, plus small items like hose clips and battery terminal nuts. p. 384
How do I get the manual after purchase?
It is a direct PDF download of about 24 MB, so it transfers quickly on a jobsite connection and opens in any PDF reader on a phone, tablet, or laptop. Nothing ships in the mail, and you can keep copies on as many of your own devices as you like.
How quickly can I access this manual after buying?
You get a 477-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Can I print this 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.
Is the electrical system covered in this Yanmar ViO30-2 Service Manual?
Yes. This manual includes wiring diagrams for the electrical system.
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