10 ► User Manual
If symptoms of poor performance develop, the following chart can be used as a guide to correct the problem.
When diagnosing faults in operation of the tool, always make sure the hydraulic power source is supplying the cor-
rect hydraulic flow and pressure as listed in the table. Use a flowmeter know to be accurate. check the flow with the
hydraulic fluid temperature at least 80 °F/27 °C.
Sinker drill will not work
No hydraulic fluid flow or
pressure.
Turn on power unit and check that 7–11
gpm/26-40 lpm at 2000 psi/140 bar is
Impeller jammed with debris. Clean the pumping chamber.
Defective inlet/ return hose
Check and adjust the hose.
Improper hydraulic fluid flow.
Check that 7–11 gpm/26–40 lpm at
2000 psi/140 bar is available
Sinker drill inlet hose or coupler
restricted.
Remove restriction and thoroughly clean.
restricted.
Straighten the hoes. If the hose must bend
at the top of the hole, use a piece of split
rigid conduit with large diameter of the
expanded hose. This keeps the hose from
kinking. Use a 90° 4-inch pipe elbow on the
trash pump outlet if necessary.
The temperature of the hydraulic
oil is too high(>60°C)
Use a cooling device to cool
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