User Guide

3736
Cleaning the Pumphead
The pumphead should be cleaned at regular
intervals and at least once a year. Remove
the deposits that form in the cavities with a
solution that is neutral to the chemical the
pump has been dosing. Inspect the head
for any cracks or worn areas.
Replace if necessary with parts from the
pumphead spare part HI 721106 (for BL7,
BL10, BL15, BL20, BL7913 and BL7914) or
HI721107 (for BL1.5, BL3 and BL5).
SCHEDULED MAINTENANCE
After 50 hours
Tight the pumphead screws with a torque
force of 2.5 Nm (22" lbf).
After 12 months
It is recommended to replace HI 721102, HI
721103 (suction and discharge valves as-
semblies) as well as the o-rings. The LDPE
hose can also deteriorate over time and, for
safety reasons, should also be changed
with HI 720032.
After 24 months
It is recommended to replace HI 721102, HI
721103, HI 720032 and HI 721106 (for BL7,
BL10, BL15, BL20, BL7913 and BL7914) or
HI 721107 (for BL1.5, BL3 and BL5).
MAINTENANCE
Your BlackStone Pump is designed to give
you years of trouble-free service. Mainte-
nance should be the preventative type, that
is, periodic cleaning and inspecting for any
damage or leakage.
Cleaning the Suction, Discharge and In-
jection Valves
Remove the valves from the pumphead,
the injection fitting and the feed.
Keep the suction and discharge valves sepa-
rated as they are not interchangeable.
Disassemble each valve and clean it with a
neutral liquid. Inspect the Kynar
®
springs.
After cleaning the glass balls, inspect them
for any excessive wear due to abrasion from
the chemical. Replace if necessary with parts
from HI 721102, HI 721103, HI 721104 and
HI721105 (see page 40 for listing).
When reinstalling the valves into the
pumphead, tighten by hand first and then
with a wrench ¼ to ½ turn.
Inspecting the hose (if used as supplied
with the pump)
Inspect to see if the hose has worn out or
weakened due to the chemicals. Pay par-
ticular attention for any signs of abrasion or
discoloration. Also check the connectors to
ensure they are tight.
Replace if necessary with parts from HI
720032.
Kynar
®
is registered Trademark of "Pennwalt Co."