5
OGP 2HP DISASSEMBLY
Visual Inspection of Pump
Quick visual inspections can save time. A visual Examination of the pump for damage to cords, controls,
or cutter, and a thorough electrical check should be performed to determine a pumps condition.
Cut Cords
Check the cord(s) for any cuts or gouges. If there is any noticeable damage, do not use the cord, remove,
and install a new cord if applicable.
Megger the Pump Leads - (Megohmmeter)
This test is to determine the resistance of the cord and motor insulation. The meter will test zero Ω if the
insulation is damaged or breaking down thus allowing current to fl ow through the insulation.
This test can best be performed if the pump leads are disconnected from the control panel, or the junction
box. To perform this test, touch one lead to the green ground. Touch the other lead to the black wire.
Repeat this test with ground to white. To pass this test, a pump set must have a reading of 5mΩ or higher
on all leads. Note that a “0” reading indicates a dead short.
CAUTION: After performing a megger test ALWAYS discharge cord set leads to ground.
Dielectric Withstand Test (Hi-Pot Test)
This test ensures that the insulation and/or spacings between live and isolated parts is suitable for
operating voltage. This test is especially useful in detecting inadequate insulation which may not be readily
visible (such as between windings within a motor) or due to some other failure (eg. Pinched wire, stray
strands, nicked motor insulation)
This test uses a very high potential (usually 1000 volts + twice the rated voltage) to stress the insulation
system of the pump and motor to verify its integrity. Because it stresses the insulation, it is actually a
destructive test and should only be used on a limited basis. Repeated testing will cause the insulation to
break down and fail.Touch the green ground lead from the pump to one of the meter leads, and the other
meter lead to one of the power leads. Repeat this test with all of the power leads.
CAUTION: After performing a Hi-Pot test, ALWAYS discharge cord set leads to ground.
