Description

New Holland F106.6, F106.6A, F156.6, F156.6A Service Manual

If you are pulling a transmission on a New Holland F106.6 grader and the manual you bought from some third-party site gives you a generic torque spec of “hand tight plus a quarter turn,” you are going to ruin that rebuild. I have seen it. Broken bolts, oil leaks, hours wasted. This Service Manual is the actual OEM document from New Holland – 664 pages, printed from the original factory files. It covers the F106.6, F106.6A, F156.6, and F156.6A graders. You want the wheel nut torque? Section 5.1.3 has it. You need the charge pressure from the ZF transmission? It is in the Specifications chapter. This is not a reprint of something scanned at 72 dpi. This is the real thing.

Safety Instructions: Not Optional on This Machine

The first 20 pages of this manual hammer home the safety procedures because a grader is a 15-ton machine with hydraulics that can crush you. Section 1.7 covers electrical energy, hydraulic/pneumatic systems, noise, and oil hazards. If you are welding on the frame, Section 5 tells you exactly which electronic connectors to disconnect – EST37A transmission control, AIC connections, engine control, cab connectors. Skip that step and you fry a $2,000 ECU. That is not an exaggeration. The manual lists the connector locations and the order to unplug them. Follow it.

Specifications: Torque Values, Tire Pressures, and Fluid Capacities

For a beginner working on a grader, the specifications section is where you will live. There are separate tables for the F106.6/F106.6A and the F156.6/F156.6A. Wheel nut torques are listed in foot-pounds. Tire pressures for each axle are given. The hydraulic system pump specs, brake service brake specifications, steering cylinder dimensions – all factory numbers. No guessing. For the ZF 6 WG-160 transmission, the tightening torques for bolts are in a comparison table (see Section 5.3). You torque that bellhousing wrong and the alignment is off. Then you stripped the threads. Use the numbers from this book.

ZF Diagnostic System: Why You Need the Factory Data

Section 3 of the Transmission chapter covers the ZF diagnostic system. It includes automatic detection of fill parameters and a diagnosis-inspection procedure. Aftermarket manuals never get this right because they copy from a different model. The New Holland engineers wrote this for the 6 WG-160 with the specific pumps and valve bodies. You need the oil quality notes (Section 5.7) and the special tool list (Section 6.1). I have used cheap generic manuals that told me to use a 12-point socket on a hex bolt – that is how you break something. This manual lists the actual tool numbers. Trust the factory.

Protecting Electronic Units When Welding – Step-by-Step Connector Sequence

Welding on this machine without disconnecting the electronics is a recipe for a nightmare. Section 5 details the connector disconnection sequence: cab connectors first, then alternator, then transmission control, then AIC. Each sub-section gives a diagram. Do not skip the vacuum pump wiring (Section 6) either – the pump package content and connection procedure is there. A guy in my shop once forgot the FWD connector (XA8.1) and the front wheel drive controller went dead. $800 repair. This manual would have saved him that call.

Inspection and Maintenance: Fuel System to Brakes – 9 Systems Covered

Section 4 runs through every routine check: fuel system, electrical, power shift transmission, hydraulic, brakes, wheels and tyres, optional air conditioning. For the brakes, Section 10 gives service brake and parking brake specifications. You will find the adjustment procedures for the blade turntable motor in Section 9.4. All of this is organized by system. You do not flip through 600 pages blind – the table of contents is detailed down to sub-subsection numbers. For example, if you need the main dimensions of the F106.6A, they are on page [DATA NEEDED] of the Specifications chapter (1.1). The manual uses page numbers, but with the PDF you can search instantly.

FAQ

Does the manual include wiring diagrams for the electrical system?

Yes. Section 14 of the Specifications chapter covers the electrical system. There are diagrams for the cab, engine control, and transmission control. These are factory schematics, not generic ones.

Can I use this manual for a F156.6 with the optional air conditioning?

Yes. Section 4.8 is dedicated to the air conditioning system (optional). Torque specs for compressor mounting and refrigerant capacity are listed.

What about towing procedures for the F106.6?

Section 3.5 covers towing devices, transport, and crane loading. It tells you where to attach chains and the weight limits.

How are the fill quantities and fluid specs organized?

Section 15 of the Specifications chapter splits into two sub-sections: one for F106.6/F106.6A and one for F156.6/F156.6A. Each lists engine oil, transmission fluid, hydraulic oil, and coolant capacities in US quarts and gallons. A beginner could use these tables without a conversion calculator.

Related Manuals

• New Holland F106.6, F106.6A 2005 Workshop Manual – 579 Pages
• New Holland F156.6, F156.6A 2005 Workshop Manual – OEM Shop Manual
• Sperry New Holland 31 33 36 Service Manual – OEM Factory Specs

For a deeper understanding of how the ZF transmission works, you might look up the Manual Transmission fundamentals on Wikipedia. That external information can help you understand the principles, but for the actual repair sequence and torque values, you need the OEM service manual. Another reference: Manual Transmission basics – good for theory, but do not rely on it for bolt specs. Use the New Holland factory data.

This is the manual that belongs in your toolbox if you own or service a F106.6, F106.6A, F156.6, or F156.6A grader. It is 664 pages of factory knowledge, organized by system, with every torque spec and safety warning you need. Access the Factory Manual from AutoRepairManuals and print it out – or keep it on your tablet in the cab. You will reference it every time you touch that machine.