MP Pumps HHLF PUMP INSTRUCTION - Manual

INSTRUCTION BULLETIN
HHLF Self-Priming Centrifugal Pumps
Overview: OPERATION:
It is important that this instruction bulletin be fully
read and understood prior to pump operation. These
instructions pertain to model HHLF pump end. Your
HHLF pump may have included a driver such as
close-coupled electric motor, engine, bearing pedestal
or hydraulic motor pedestal that will hereafter be
referred to as the driver.
Unpack and check the unit over carefully. Missing or
damaged parts should be reported to the freight
company.
Packed with each unit are instruction booklets, parts
list and performance information.
INSTALLATION:
Optimum performance can be attained by placing the
pump as close to the liquid source as possible.
Secure the pump by mounting it to a foundation or
base plate.
Hose or pipe can be used on the suction and
discharge. The suction line must not be reduced in
size. If hose is used, reinforced non-collapsible type
is recommended. The discharge line must be rated to
the maximum pressure developed by the pump.
Avoid kinks in the hose and unnecessary restrictions
that may affect pump performance.
All pipe connections must be sealed with adequate
thread sealant. A small air leak in the suction line
will affect priming performance. If a throttling valve
is used to adjust the flow rate, it should be mounted
to the discharge piping only - never in the suction.
A large low restriction de-watering type strainer must
be used whenever there are solids present in the
liquid source.
Caution – Do not run the pump dry. The seal in
the HHLF pump is lubricated by the liquid in the
pump. Serious damage will result if the pump is run
without liquid in the housing.
Fill the pump with liquid through the fill-plug located
on the top of the housing. The pump housing should
be completely full. If the pump has a discharge valve
it must be fully open to expel air during priming at
initial start-up. Long horizontal suction lines require
extra time to prime, 2 additional minutes for every 10
feet of horizontal run.
Start the pump driver. The pump will prime the
suction hose and establish flow in about 5 minutes,
more or less, depending upon the lift distance and
length of horizontal run. After prime, the pump will
perform to its full flow capability.
After the initial prime, the pump will retain liquid in
the housing and may not need to be refilled after
shutdown and restart even if the suction pipe has air
in it.
TROUBLE SHOOTNG;
If the pump fails to prime or stops pumping check for
the following possible causes:
1) Insufficient liquid in the pump.
2) Air leak in the suction line due to loose
connections or pinholes in the hose.
3) Collapsed suction line or clogged strainer.
4) Seal worn and sucking air.
5) Worn impeller – impeller gap too large.
6) Pump not running fast enough.
7) Suction lift too high.
8) Priming against high head or obstruction such as
check valve in discharge line.
Form 3071-A
3/04