Instron 2716 Series, Operating Instructions Manual

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Troubleshooting
Product Support: www.instron.com
Before you contact Instron Service, note the model and serial numbers of the test system
and make sure there is a telephone at the test site.
Table 6. Troubleshooting
Problem Cause Remedy
Specimen slips under load Incorrect size or type of jaw face Install the appropriate jaw face
for specimen size and type
Cyclic or compressive loads Do not use wedge action grips
for cyclic or compressive testing
Not enough gripping area Install specimen for complete
engagement with jaw faces
Inadequate gripping force Tighten grip handles
Inadequate jaw face lubrication Lubricate rear and bottom of the
jaw faces
Load string misalignment Verify alignment of load frame,
load string components, and
specimen
Specimen surface irregularities
such as scale or uneven surface Clean and true specimen
surfaces
Specimen too hard Do not test specimens harder
than 45 Rockwell C
Specimen breaks at jaw face Initial gripping force is too great
for specimen Do not over tighten control nut
Jaw faces do not release
specimen or fail to retract Jaw face serrations are bound to
the specimen Lightly tap specimen to release
bond
Debris or contaminants are
obstructing jaw faces Remove and clean jaw faces,
clean the grip body, lubricate
and reinstall jaw faces
Tensile load on specimen Remove load
Inadequate jaw face lubrication Lubricate rear and bottom of the
jaw faces