Sotera DEF - Manual (Page 7)

7
Trouble Shooting
The following “Trouble Shooting” guide is provided to offer basic diagnostic assistance in the
event you encounter abnormal service from your Tuthill product.
CAUTION! Always keep the nozzle in contact with the container being filled
during the filling process to minimize the possibility of static electricity build
up or discharge.
WARNING! DO NOT open or attempt to repair the motor on your Tuthill pump.
Return it to the place of purchase for service. Opening the motor case can
compromise the integrity of the Explosion Proof construction (if equipped with
an Explosion Proof motor) and will void any existing warranty and certification
(UL listing).
WARNING! Be certain all power to the pump is turned off prior to performing
any service or maintenance.
IMPORTANT! When performing diagnosis and repairs to a DEF pump, it
is very important you take the necessary steps to guarantee the purity of
the DEF fluid.
1) Maintaining the purity of AUS32 (Aqueous Urea Solution 32.5%)/ DEF is
critical; as such, it is imperative once the system is assembled, it must
remain sealed to insure the integrity of the fluid. Breaking the seal on
the system can lead to fluid contamination.
2) After dispensing DEF be certain to drain all the fluid from the nozzle,
making sure it is pointing downward when stored in the nozzle boot. DEF
remaining in the nozzle tip and exposed to air will crystallize and can plug
the nozzle.
3) DO NOT lay the dispensing nozzle on the ground or any surface that may
contaminate the nozzle tip as this can compromise the purity of the DEF.
4) Standard threads on the DEF pump are BSPP style and require no special
sealant; if your pump was special ordered with NPT threads, use the
appropriate sealant for the fluid you are pumping.
5) Use new latex gloves and work in as clean and dust free an environment
as possible to reduce the risk of airborne contaminants entering the DEF
pump, hose, and container.
6) To minimize the amount of fluid returning to the storage tank prior to
service, turn the pump off, and open the nozzle into a container to drain
the fluid in the hose. Pull the hose down to maximize the amount of fluid
drained from the system. When the flow has stopped, close the nozzle.
7) DEF crystallizes when exposed to air; therefore, it is desirable to minimize
the amount of time the DEF wetted components in the delivery system
(pump, hose, meter, and nozzle) are open.
8) After repairs have been completed and the system reassembled, flush the
entire dispensing system by pumping 5 – 10 gallons of DEF through it.
This purges the system of air, and insures any impurities that may have
entered the system are washed out. Dispose of the DEF used to flush the
system using approved DEF handling procedures; do not return the fluid
to the drum or tote, or use it in a vehicle. Any repair requiring the
sealed system to be opened will require this procedure!