Hydrotech Classic Series Stenner Basic Service Manual - Manual (Page 22)

21
Tube fittings pulling out of the tube
• Pulling excessively on the tube fitting when installing a
replacement tube. Allow rollers to stretch tube into
position and follow tube replacement instructions.
• Pre-stretching the tube before replacement.
Normal tube failures
• Pin hole at discharge side; tube will leak.
• Breakage at the suction side.
• Fatigued, no longer completely compresses, no rupture
evident, doesn’t pump.
The above conditions are usually indications that the tube has
reached the end of its service life. If all other conditions/wear
have been checked and corrected, determine maintenance
schedule.
NOTE Additional information
Due to wear, the used tube will have stretched and
will be longer than the new tube.
NOTE Additional information
Tube fitting flange cracks are normal on the
discharge tube fitting. They do not indicate a
failure or defect.
Continued...