Description

SAME Deutz-fahr 80, 105 Workshop Manual: Hydraulic Inversor Repair Specs

If you are tearing into a hydraulic inversor on a SAME Deutz-fahr 80 or 105 tractor without factory documentation, you are asking for trouble. I have seen guys guess on clutch pedal clearances and end up with a transmission that shifts like a cement mixer. This Workshop Manual — all 112 pages — is the original OEM print that SAME Deutz-fahr Group S.p.A. issued for the Hydraulic Inversor 80-105 HP. It covers the electro-hydraulic control system, the removal and refitting sequence, troubleshooting, and the full electrical schematic. No aftermarket summary, no third-party paraphrasing. You get the same binder that sits on the tech’s bench at the dealership.

Hydraulic Inversor 80-105 HP: What This Manual Actually Covers

Section 1 starts with safety rules that go beyond the generic warnings you see in aftermarket books. It covers starting, stopping, operation, and a full maintenance schedule that includes the Engine, Electrical system, Hydraulic system, and Tyres and wheels. There is a tightening torque table (in Nm) for bolts, nuts, and studs — and that table is specific to the 80 and 105 models. Section 2 dives into description and operation of the inversor with electro-hydraulic control, including the innovative features and the operating principle. This is not a theory lesson; it tells you how the system works so you can diagnose it without replacing parts blindly.

Troubleshooting the Electro-Hydraulic Control

Section 4 is where you will live when the inversor starts acting up. It lists general precautions for electronic components, a presentation screen menu, and specific diagnostic steps for the clutch pedal, joystick direction change, HML gear change, and enabling pushbutton. There is a full HYDRAULIC INVERSOR ALARMS LIST that gives you the fault codes and what they mean. If you have the ALL Round Tester, the manual shows you how to run diagnosis on the inversor control unit. No guesswork — you read the code, you follow the step.

Electrical System and Circuit Diagrams

Section 5 contains the circuit diagrams for the entire inversor system. Aftermarket manuals often redraw the wiring and miss a ground point or a diode. This manual reproduces the factory schematic. You trace the wire color, you find the connector pin, you measure voltage. That is how you avoid cooking a control unit. If you need to understand how the Manual Transmission interacts with the inversor, this diagram shows the interlock logic.

OEM Print vs Aftermarket: A 112-Page Difference

I have been doing this for 28 years. I can spot a third-party manual from fifty feet: blurry diagrams, torque values that say “tighten securely,” and troubleshooting flow charts that loop back to “see dealer.” This SAME Deutz-fahr manual is laser-printed on a factory scan. Every torque specification, every hydraulic port location, every wire color — it comes from the original engineering data. The removal and refitting procedure in Section 3 tells you the exact sequence for taking the inversor out of the intermediate transmission casing and reassembling it. You do not need to reinvent the procedure.

Audience: Who Needs This Manual on the Bench

If you are a home garage mechanic who maintains a SAME Deutz-fahr 80 or 105, you need this manual because one wrong step on the inversor assembly means the tractor does not move. If you are a shop owner with a customer waiting on a harvest season, this manual saves you from burning billable hours on diagnostics that lead nowhere. The Engine and transmission systems are integrated — the inversor control unit talks to the engine ECM. Without the factory electrical diagrams, you are guessing. And I do not recommend guessing on a tractor that costs more than a used car.

Related Manuals You Might Need

• Deutz-Fahr Hydraulic Inversor Workshop Manual 110 130
• DEUTZ-FAHR 1000 Series Engine Workshop Manual – Section: 16.4
• DEUTZ-FAHR AGROTRON TTV 1130 1145 1160 Workshop Manual

For more on manual transmissions in tractors, see Manual Transmission — the clutch and inversor share the same housing.

Frequently Asked Questions

Does this manual cover the clutch pedal adjustment?

Yes. Section 4 includes a dedicated subsection for the clutch pedal under troubleshooting. It describes the sensor signals and adjustment procedure.

What about the joystick wiring for direction change?

Section 5 has the full circuit diagram for the joystick. The manual also lists the diagnostic steps for joystick failure in the alarms list.

How do I diagnose the enabling pushbutton?

The enabling pushbutton is covered in the troubleshooting menu. The manual walks you through testing the input signal at the control unit connector.

Are there torque values for the inversor housing bolts?

Yes. The tightening torque table in Section 1 lists Nm values for bolts, nuts, and studs used on the inversor and transmission casing.

You have read the specs, you have seen the table of contents. Now stop hunting for the missing torque value on a forum. Access the Factory Manual and get that inversor back into service.