16
VISUAL REFERENCE
A diamond pattern that forms where the tube presses against the tube housing indicates
excessive back pressure. Excessive back pressure can be caused by any blockage, a
clogged duckbill or when the system pressure exceeds the pump tube pressure rating.
An oval pattern indicates worn rollers and/or the pump tube has reached the end of its
service life. Pump tubes can rupture without either pattern apparent.
The most common tube problems are from a lack of routine maintenance.
Always establish an application specific maintenance schedule.
PUMP TUBE
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Roller
DIAMOND PATTERN
Excessive pressure
or blockage
TEAR DROP PATTERN
Normal
OVAL PATTERN
Fatigued tube or
worn components
(rollers)
Tube