Jamar dynamometer service manual
Posted by on May 30, 2015 The following information was taken from the JAMAR Hand Dynamometer user manual. The JAMAR Hand Dynamometer is designed to provide reliable service, with minimal maintenance, over a period of many years. To make sure the instrument is ready accurately, it's a good idea to make a few checks occasionally, as listed below. Post Remove adjustable handle to check that each post moves up and down freely on its guide (the part that the post bears on even when you exert pressure on the side of the post. About once a year, place a small amount of grease on the two guides. If excessive friction exists between the post and guide, return the dynamometer for service. Hydraulic To check the hydraulic mechanism, first remove the adjustable handle. While watching the top post, push down on the bottom post. Normally, both should travel about 1/8 of an inch, with top and bottom posts traveling in opposite directions. Travel less than 1/16 of an inch, indicates a probable leak in the hydraulic system, which requires service. Handle Grasp the instrument normally and look carefully at the way the forks of the adjustable handle are supported on the posts. Each fork should touch the post at approximately it midpoint. If this is not the case, return the instrument for adjustment. Peak Hold Needle Check for excessive friction in the peak-hold assembly by turning the peak-hold knob counter clockwise. If the peak-hold needle deflects the gauge needle, return the gauge for service. If the peak-hold needle is knocked off its support pin, it can readily be repositioned. Unscrew the crystal and turn it upside down. Locate the brass pin in the center of the crystal (the pin is part of the chrome knob on the outside of the crystal). Locate the slot on the brass pin and place the peak-hold needle into this slot. Calibration The instrument is calibrated at the factory by loading it at.
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