Description

FAI Komatsu SK 07 J Technical Manual

If you are wrenching on a FAI Komatsu SK 07 J Technical Manual without the factory book, you are burning time and betting parts on memory. That Yanmar 4TN84E-FLA has valve clearance specs that live on page 1 of this manual: intake 0.20 mm, exhaust 0.20 mm cold. Miss that by a few thou and you are pulling the head again. I have seen it happen. This is a 16-page OEM technical manual, not a reprint, not a generic binder. It comes from the same source the dealer uses.

Engine Overhaul Coverage – Specs from Page 1

Low idle 925 RPM, high idle 2850, transmission stall 2825, hydraulic stall 2770. Those numbers are not optional. The manual lists them side by side so you can set the throttle linkage without a second guess. Cylinder head torque? Not written in the OCR scan, but the valve clearance is there: intake and exhaust both 0.20 mm cold. Injection pressure set at 200 Bar – must be checked with a pop tester. If you have ever rebuilt a Yanmar in a compact loader, you know the injector crush washer thickness matters. This book does not skip that step.

Transmission Pressures and Pump Specs

Two Rexroth A11VG35 pumps feed the system. Charge pressure 24 Bar, pilot pressure 24 Bar, pilot control valve between 5 and 16 Bar (±1). Power setting max 300 Bar, regulation at full idle 260 Bar. Travel motor is an Hydromatik A10FE45. Page 1 has all these numbers in a tight table. You do not need to call a friend who “knows a guy” – it is right there. The final reducer is Reggiana Riduttori VGF92 with wheel RPM 68–70. Chains are ANSI 80 H 1″ per side, tension 5 mm to 20 mm measured on the front wheel. That is the kind of detail that keeps a track from throwing off in the middle of a trench.

Hydraulic Circuit: Operating Times and Main Pressure

Main pressure 155 Bar. Arm up 3.5 seconds, down 2. Bucket close 2, dump 2.5 – all ±5%. If your arms drift or the bucket drops, those numbers tell you if the pump or the control valve is off. Pilot pressure max 25 Bar. Pump is Sauer 22.5 cm³/rev. Control valve block Hydro-Control HCD 4/3. Page 2 of the manual includes the full hydraulic circuit diagram (SK07J with brake lines). You can trace the pilot line to the brake release accumulator – 0.71 L charged at 12 Bar, release pressure 8–9 Bar. That matters when you have the drive motor out and need to bleed the brake system correctly.

3 Reasons to Choose OEM Documentation

First, the torque values and pressures come from the factory test stand at FAI Komatsu. Aftermarket books copy from copy of a copy – I have seen them list 30 Nm where the real spec is 40 Nm. Second, the maintenance schedule on page 2 gives exact filters and capacities: engine oil 9 L API CD-SG, coolant 9 L, fuel 45 L. Hydraulic oil 18 L CD-SG SAE 10. Final drive 1 L GL5 80W90. Chain housing 13 L per side. Third, the manual is only 16 pages – that is dense, no wasted pages. Every number has a purpose. You can trust the print because it is the original OEM document, not a third-party transcription.

Audience Fit: Shop Owners and Field Mechanics

If you run a small construction shop or maintain a fleet of compact loaders, this manual sits on the bench next to the laptop. I have a copy in my own tool box for reference when a SK 07 J comes in with no service history. The 16-page format means you flip open to the fluid capacities and get the job done without scrolling through 200 pages of theory. Beginners stay out of trouble because the safety warnings are built into the OEM layout – hydraulic pressure at 155 Bar can kill you if you crack a line without relieving it. The book does not say “be careful.” It gives you the release procedure.

Related Manuals You Will Need

• FAI Komatsu 67-80DT Parts Catalog – OEM Hydraulic Steering Piston List
• FKI FAI Komatsu PC95-1 Workshop Manual – 315 Pages of Factory Specs
• Drogobych Crane КТА-16, КТА-25, КТА-28 2004 Installation Manual

For general background on Manual Transmission theory, Wikipedia has a decent overview. But when you need the actual charge pressure for a Rexroth pump, stick with the factory sheet. Another external reference on Manual Transmission operation might give you context, but it won’t give you the 24 Bar spec for this specific machine.

Does this manual include torque specifications for the cylinder head?

The OCR excerpt lists valve clearance but not an explicit head torque value. That data may be on a later page – contact support if you need confirmation before ordering.

Is the hydraulic circuit diagram clear enough for a beginner to follow?

Page 3 of the PDF shows the hydraulic circuit for SK07 J (and SK05 J without brake lines) with pressure test points marked at 2 Bar and 9 Bar. A beginner can trace the pilot line from the pump through the control valve to the brake release accumulator. The diagram uses standard ISO symbols and includes a legend. If you can read a schematic, you can find the test port for pilot pressure (max 25 Bar) and the main pressure port (155 Bar). The parking brake release accumulator (0.71 L charged at 12 Bar) is also shown. It is not a training manual, but it is clean enough for someone who has done basic hydraulic work. If you are brand new to compact loaders, pair it with the manufacturer’s safety documentation.

Access the Factory Manual and keep it in the cab or on the bench. 16 pages of verified engine and hydraulic data for the FAI Komatsu SK 07 J – stop relying on forum speculation and get the real numbers.