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Hydraulic Coil Spring Tester - 7306 & 7308

Assembly & Operating Instructions


Compressed coil springs are dangerous! If the spring comes out of the tester while compressed it can cause serious injury or death.

  • Always use the tester as shown here and per instructions.

  • Never test a spring that bows sideways when compressed.

  • Be sure that the spring is properly seated in the tester.

  • Never exceed the capacity of the machine.

To Unpack & Assemble:

  • Remove clear shrink film by carefully cutting.

  • Remove TOP pin ONLY (with black ball handle).

  • Slide top assembly over top and off. (This is actually the bottom assembly - they are reversed for shipping.).

  • Hold bottom assembly, remove pin, and slide over the top and off.

  • Reinstall the assembly with the gauge facing the same side as the jack handle. It will slide down and rest on the jack. Install the other assembly using the 2 pins.

  • Remove the packing material from around the gauge and tighten the 5/16" bolt in the back.

  • Install the dial indicator and holder as shown. The aluminum holder simply slips over the lower sliding assembly and the magnet holds it in place.

To Test A Spring:

  • Install the spring in the tester, remove the 2 large pins (with black handles), lower the upper spring seat until it rests on the spring. Install the 2 pins until fully seated. It may be necessary to move the upper seat up until the first available holes line up.

  • Using the jack compress the spring until the force gauge just begins to move.

  • Preload the spring by .500" (1/2"). This is very important and should be done accurately. You may use 1.000" or some other amount as long as you always use the same number.

  • Record the preload force on the gauge.

  • Slide the dial indicator and aluminum holder all the way to the bottom so that the indicator is compressed completely. It is held in place by a magnet and will slide fairly easily. Rotate the outer dial so the pointer reads 0.

  • Using the dial indicator to measure, compress the spring 1.000" (10 revs of the pointer). Note that the indicator is extending. This will avoid damage if you go beyond 1.000".

  • Record the new force on the gauge. Subtract the preload force and you have the spring rate in lbs/in of compression.


CAUTION:  The enclosed 3/4-16 x 2 inch bolt is to be used to secure the lower spring cup when used in the inverted position (as used with coil-over springs). Use of the 3/4-16 x 3 inch long bolt in this inverted spring cup position may result in damage to the hydraulic cylinder.

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