WACKER Group 0007659, Repair Manual

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Disassembly/Assembly Procedures PG Repair
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5.5 Inspection
Before disassembling the pump, check for conditions both outside and
inside the pump which could affect performance.
Inspecting conditions outside the pump:
• Check that the pump is operating within specifications
Remember that as suction lift and discharge head increases, pump
output is reduced.
• Check the type of fluid being pumped.
The pump will perform poorly if it is used to pump heavy sludges or
mud.
• Check the suction hose for leaks or damage.
A puncture or tear above the water line will make the pump difficult or
impossible to prime.
• Check that the suction hose is the correct type.
The suction hose must have strong rigid walls. Thin-walled collapsible
hoses like those used on the discharge side cannot be used.
• Check that the strainer hose lines are not blocked or restricted.
Remove any dirt, debris or vegetation which might interfere with the
fluid flow. If possible, flush the hoses with clear water at the end of
each operation and suspend the strainer in water, rather than resting
it in sand or mud. Check that the discharge hose is not kinked.
• Check that all the fittings and hose clamps on the suction line are
tight and sealed properly.
The fittings and clamps may loosen during operation. Add additional
clamps where necessary to ensure a good seal.
• Check that the pump case is filled with water and the prime plug
is sealed tightly before start up.
Inspecting conditions inside the pump:
• Check for debris and dirt inside the pump casing.
If allowed to accumulate, debris may restrict fluid flow through the
pump or impede the movement of the impeller.
• Check the engine operating speed— 3600 ±100 rpm.
As engine operating rpm falls, the pump capacity and discharge head
are reduced.