Lh series, General pump – General Pump LH User Manual
Page 9
GENERAL PUMP
A member of the Interpump Group
LH SERIES
Page 9
10. START UP AND RUNNING PROCEDURES
10.1 Before start up
Before start up make sure that the following conditions
have been complied with:
1. Suction line should be connected: the pump must
never run dry.
2. Suction line must be perfectly air-tight.
3. Any ON-OFF valve in between the pump and water
source should be open and make sure the water
gets into the pump freely.
4. Set the pressure line in dump mode in order to let
the air in the pump get out easily thus facilitating
the pump priming.
5. Make sure all suction/delivery line connections are
fully tightened.
6. Joint alignment, belt tightening and PTO shaft
inclination tolerances should remain within the
values indicated by the transmission Manufacturer.
7. Make sure the oil level is correct.
Note: in case the pump has not run for a long period of
time check the suction and delivery valves for scaling
(see paragraph 11.2).
10.2 Starting up
1. Pump and motor/engine should start offload, set the
regulating valve to zero or set the pressure line in
dump mode by means of proper dumping devices.
2. When starting the pump up for the first time or after
every wiring re-connection check for the proper
direction of rotation.
3. Check that the rotating speed does not exceed the
rated value.
4. Before putting the pump under pressure let it run for
some time until the oil flows freely.
5. Before stopping the pump release the pressure from
the system by operating the dump device or by
releasing the regulating valve and reduce RPM to a
minimum (diesel applications).
Note: in case of feeding by a centrifugal pump, make sure
that the plunger pump start only when the correct
inlet pressure is provided.
10.3 Water leakage
During operation a small amount of water (a few drops a
minute) is released from the pump fluid end; this leakage
is designed to provide lubrication for the pressure
packings. The leakage is drained out of the pump
through a hole in the lower cover (Fig. 6).
This hole must always be kept open.