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C. Obstruction in pump can be indentified by a drop in pressure. If a drop in pressure is accom-
panied by a frothy or whitish discharge stream, blockage is in suction line or sump area. To
clear the pump:
1. Disengage (turn off) clutch and stop engine. Perform proper lockout/tagout proce-
dures.
2. Loosen suction pipe clamps. If material is in the tank, stuff a rag into the suction pip-
ing.
3. Remove clamp closest to pump.
NOTE:
If no water comes out, it means the obstruction is in sump area.
4. Reach into pump and remove obstruction. If jammed, the pump suction cover may
need to be removed.
5. Reassemble, removing rag plugging the suction piping.
D. Obstruction in sump area, which is located at the bottom of the tank on the inside where the
suction pipe is attached. There are three methods that can be used to remove an obstruc-
tion in the sump area. Use one of the methods described below:
1. Clear the sump by backflushing through the discharge plumbing with the water sup-
ply hose. This is the easiset method.
2. Remove the drain plug and run a long pole through the opening and into the sump
area. Remove the obstruction and replace the drain cap.
3. Use a pipe or pole through the loading hatch opening to dislodge the obstruction.
CAUTION
Do not turn the shaft backward with a pipe wrench. This will unscrew pump impeller from
pump shaft. Consequently, when clutch is engaged (turned on), the pump impeller will screw
onto pump shaft with a force great enough to break pump impeller. Failure to comply could
result in minor or moderate personal injury. Failure to comply could also result in product
or property damage.