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Symptom
Potential Cause(s)
Pump cycles cor-
Pump may have lost prime/become 'Air
rectly but Chemical
locked'
does not discharge
at the correct rate
Suction check valve clogged with debris
Low chemical Inventory
Suction side isolation valve closed
Chemical obstructed from entering the
pump No chemical flow through primer
port when opened
Low Pressure
Seals are worn/Damaged
Dynamic seal
leaking through
drain port
LEAK AREA
19
Recommendation(s)
With the pump cycling, open the priming screw to release any trapped
air in the pump chamber When chemical flows smoothly air has been
displaced It is recommended to repeat this procedure to be sure all
trapped air has been evacuated from the System
Direct all chemical to a contained area to prevent spills when prim-
ing pump
Close suction isolation valves Disconnect suction plumbing and remove
the suction check bushing Inspect check valve O-ring and seat for deb-
ris Clean and/or replace as required [o-
If the O-ring appears pitted, deformed or swollen it is recommended
to confirm your elastomers compatibility with media being injected.
Check Valve bodies do not need replacement when failing to seat
Rebuild seal kits are available from MCI or your authorized pump dis-
tributor Please contact MCI customer service for more information:
+ 1 250 888 4565
If inventory is empty, refill supply
Running the pump dry may allow air to enter the System. When re-
filling your chemical supply it is always recommended to prime the
pump head to evacuate air from System
Isolation valves are typically found immediately exiting the chemical
tank bulkhead Confirm all valves are in the open position
Plumbing upstream of the System may have blockages preventing
chemical from entering the fluid end Check the following:
1
A common example is a plugged in-line chemical filter, if found to
be the cause clean or replace the existing chemical filter
2
If the pump has been decommissioned for a period of time it is pos-
sible for the suction check ball to stick to its O-ring seat To repair
dislodge the ball from the bottom side of the suction bushing [It
is not required to remove the suction seat to perform this task]
Order replacement seal kit and replace
Although spring energized seals do not require any adjustment
throughout the life expectancy of the seal, they do have a life span
Due to System contaminants or abrasive qualities of certain chem-
icals it is difficult to predict seal life expectancy for all applications.
MCI recommends a semi-annual seal cartridge change to reduce the
risk of bypassed chemical.
It is possible for older chemical storage tanks to become contaminated
with debris over time This can greatly reduce the life expectancy of the
seals and also affect check valve performance
MCI offers high performance in-line chemical filters to greatly re-
duce the likelihood of this occurring. Please contact MCI customer
service for more information: +1.250.888.4565
-012]
ring size
www.mcisolutions.ca
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