Description

Fendt 309 Vario, 310 Vario, 311 Vario, 312 Vario 2007 Workshop Manual

If you have torn into a Fendt Vario tractor without the factory book, you know the pain: chasing wiring colors through aftermarket diagrams that don’t match, guessing torque values and hoping the housing doesn’t crack, or burning billable hours hunting calibration codes. This Fendt 309 Vario, 310 Vario, 311 Vario, 312 Vario 2007 Workshop Manual fixes that. It is the same 1185‑page document AGCO handed their dealer techs in October 2007. No reprints, no third‑party summaries – just the OEM data from Johann‑Georg‑Fendt‑Str. 4.

You are looking at the workshop manual for the COM III series: Fendt 309 Vario (chassis 336..1001‑), 310 Vario (337..1001‑), 311 Vario (338..1001‑), and 312 Vario (339..1001‑). Every section, every torque table, every electrical component location map is here. Let me walk you through what you actually get.

Electrical: Component Locations and Schematics

Aftermarket wiring diagrams are a gamble. This manual identifies every electrical/electronic component by letter group – A, B, E, G, H, K, M, R, S, X, Y – and maps their physical location on the tractor. Need to find the foot throttle sensor (B055) or the rail pressure sensor (B086)? The Electrical section under Component Location gives you the exact spot. That alone saves you from pulling half the cab loom.

Does It Cover the Fuel System?

Yes, and it goes deep. Section 2060 – Fuel system covers the common rail from the water separator (prefilter) through the high pressure accumulator (rail), the metering unit (Y091), and all six injectors (Y095–Y101). It includes the bleeding procedure for the fuel system and the steps to remove and install the high pressure relief valve and rail pressure sensor. No guesswork on which line to crack first.

5 Critical Calibration Codes You Need

The Setting and Calibration section lists codes 8001, 8002, 7666, 6034, 7034, 4001, 4002, 4005, 4007, and 4009. These are not optional. If you swap a transmission control unit or adjust the ML 75 transmission, you will need these codes to tell the ECU what hardware it is talking to. After a clutch valve block replacement, calibration code 4005 resets the clutch/turboclutch adaptation. Skip it and the transmission will hunt and buck.

Torque Specs and Fluid Capacities

The General section opens with tightening torques for bolts in Nm (convert to ft‑lbs as needed – multiply by 0.73756). This is the factory specification for every fastener on the tractor, not a generic chart. For the transmission pressure measurement (Section 1005‑E), you need those numbers to avoid stripping ports on the ML 75 valve block. Fluid capacities for the hydraulic system, transmission, and engine are listed per the 2007 edition.

Why Factory OEM Beats Aftermarket

I have seen aftermarket manuals list the wrong bolt grade for the rear axle housing connection (Section 1050 – Housing). This OEM version gives the exact step: disconnecting tractor, transmission, and rear‑axle housings, and the connecting procedure. The torque sequence for the pinion shaft and ring gear (Section 1010‑G) comes straight from Fendt’s engineering department. One wrong number and you are buying a new differential. That is the difference.

For related models, see the Fendt 922-933 Vario COM III 2007 Workshop Manual – 1267 Pages”>Fendt 922-933 Vario COM III 2007 Workshop Manual – 1267 Pages for larger frame machines, or the Fendt 920 Vario 2007 Workshop Manual – 861 Pages OEM Specs”>Fendt 920 Vario 2007 Workshop Manual – 861 Pages OEM Specs if you work on the six‑cylinder. The Fendt 700/800 Vario 2006 Workshop Manual”>Fendt 700/800 Vario 2006 Workshop Manual covers the earlier generation.

Before you start, understand the basics of a Manual Transmission”>Manual Transmission versus the Vario hydrostatic system – the emergency operating mode for the ML 75 is covered in Section 1005‑A. And if you need general tractor electrical theory, a Manual Transmission”>Manual Transmission primer helps, but this manual has everything you need for the Fendt 300 series.

Does this manual include wiring diagrams?

Yes. The Component Location section (D) maps every electrical/electronic component by letter code – A, B, E, G, H, K, M, R, S, X, Y – and the schematic is embedded in the machine’s harness layout. It is not a colorful aftermarket diagram; it is the OEM component location map used by factory service.

What about the transmission emergency mode?

Section 1005‑A details the emergency operating mode for the ML 75 transmission. If the control unit fails, you get the procedure to move the tractor without a tow truck.

Every tractor in this range – 309 Vario, 310 Vario, 311 Vario, 312 Vario – uses the same 2007‑era COM III electronics and common‑rail Deutz engine. This manual is the single source for fixing them right. Access the Factory Manual now and keep it on your workbench.