Tractor Part:identifying hydraulic Fittings

When maintaining or restoring your tractor, identifying its required parts can often be half the battle. This is especially true with hydraulic systems, specifically pipe and/or tube fittings. With countless manufacturers, designs and size variations, it’s important to recognize key differences before making replacement and purchasing decisions. Here’s a three-step guide to identifying hydraulic fittings:

1. Investigate

Look for specific information like where the part was made. A fitting’s geographic origin can provide insight into certain design elements. For example, American-made fittings have standards and dimensions that are different from parts made in Japan or the United Kingdom. Here’s a summary of which fitting types are typically manufactured by region:

• Europe: DIN/DSP
• UK/Australia: BSP
• America: NPT/JIC/UNO/ORFS
• Japan: JIS

Now determine if the fitting is parallel or tapered. Then check the seal to determine whether it’s an O-ring or washer. Don’t forget to evaluate the cone seats (if present) to determine their positioning and whether or not they are concave or complex.

2. Measure

Accurate measurements are the most important part of hydraulic fitting identification. Start with the threads by using a caliper to measure the outside diameter (OD) of male fittings and inside diameter (ID) of female fittings. Then determine the number of threads per inch, or pitch. After measuring threads, calculate the seat angle by using a seat gauge. Each seat angle is designed to function with a specific type of pipe or tube, so incorrect fittings will impact fluid pressure and other elements of the hydraulic system. Some fittings have dual seats, so make sure to record and compare both angles.

3. Compare

After gathering as much information as possible, compare your notes and measurements with corresponding dimension charts. You can double check dimensions by using a fitting with the same thread characteristics.
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