Classic Series
www.stenner.com
26
TROUBLESHOOTING – PUMP TUBE
NOTICE:
A leaking pump tube damages the metering pump. Inspect pump frequently
for leakage and wear. Refer to Tube Replacement section for additional safety
precautions and instructions.
PROBLEM
POSSIBLE CAUSE
SOLUTION
Tube leaking
Pump tube ruptured
Identify and correct cause,
clean components of chemical &
replace tube according to instructions
Calcium or mineral deposits
Clean injection fitting; replace tube and
duckbill according to instructions
Excessive back pressure
Verify system pressure against tube psi,
replace tube if needed
Tube is twisted
Replace tube according to instructions,
hold tube fitting while tightening
connecting nut to prevent twisting
Tube not centered
Clean components of chemical,
replace tube according to instructions &
confirm tube is centered
Tube life is shortened
Chemical attack
Check chemical compatibility
Mineral deposits at injection point
Remove deposits, replace pump tube
and duckbill according to instructions
Sediment blockage at check valve
Clean injection fitting, ensure suction
line is 3" above tank bottom. Use
suction line strainer.
Degraded check valve duckbill
Replace duckbill at every tube change
Duckbill in wrong orientation
Reverse duckbill orientation
Seized rollers caused abrasion on tube
Clean roller assembly or replace,
do not lubricate
Exposure to heat or sun
DO NOT store tubes in high temperatures
or in direct sunlight
Tube connection is leaking
Ferrules installed incorrectly,
Replace ferrule, beveled end should face
missing or damaged
the tube fitting
Crushed ferrule
Replace ferrule
3/8" nut loose
Secure adapter and tighten 3/8" nut
as needed
Missing ferrule in 3/8" adapter
Replace with new adapter fitting or
insert new ferrule into adapter
Sleeve and/or plastic gripper inside
Replace if damaged or missing/
3/8" connecting nut is missing
Reorient if incorrectly assembled;
damaged, or incorrectly assembled
gripper beveled end faces nut;
sleeve wider end faces gripper
