Chapter: Maintenance
40 M10-14052-EN
Troubleshooting
Improper adjustments or a lack of maintenance is the cause of most grip operating
problems. To help you when a problem develops, Table 5 suggests a probable cause
and recommends a solution.
Table 5. Troubleshooting
Problem Cause Remedy
Specimen slips while under
load
Wrong size or type of jaw face Install appropriate jaw face for
specimen size and type
Cyclic or compressive loads Do not use wedge action grip for
cyclic or compressive testing
Not enough gripping area Install specimen for complete
engagement with jaw faces
Not enough preload Tighten the grip handles
Not enough lubricant on jaw
faces
Lubricate the back of the jaw faces
Specimen breaks at jaw face Initial gripping force is too
great for specimen
Do not over-tighten control nut
Misalignment of a load string
component
Verify alignment of load frame and
specimen
Dirt, corrosion, specimen
debris or other contaminants
are obstructing face clearance
Remove jaw faces, clean the head
tapers, apply Molykote g-N paste and
install jaw faces
Jaw faces will not release or
do not completely retract
Jaw face serrations are bound
to specimen
Lightly tap specimen to release bond
Dirt, corrosion, specimen
debris or other contaminants
are obstructing face clearance
Remove jaw faces, clean the head
tapers, apply Molykote g-N paste and
install jaw faces
Tensile load on specimen Remove tensile load
Not enough lubricant on jaw
faces
Lubricate the back of the jaw faces
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