Stanley Black & Decker SM50 user manual Troubleshooting, Problem, Cause, Solution

TROUBLESHOOTING

If symptoms of poor performance develop, the following chart can be used as a guide to correct the problem.

When diagnosing faults in operation, always make sure the hydraulic power source is supplying the correct hydrau- lic 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.

PROBLEM	CAUSE	SOLUTION
Pump will not start.	No hydraulic fluid flow or pressure.	Turn on power unit and check that 7–12
		gpm/26–45 lpm at 1000-2000 psi/70–140
		bar is available at the pump.
	Defective couplers.	Check the couplers. Replace if necessary.
	Impeller jammed with debris.	Clean the pumping chamber as described in
		the Maintenance section in this manual.
	Impeller rubbing against wear	Check and adjust the impeller clearance as
	plates.	described in the Service Manual.
	Defective hydraulic motor.	Repair or replace motor.
Poor pump performance.	Hydraulic flow reversed.	Check that the hoses are correctly
		connected to the pump motor ports. The
		female coupler should be connected to the
		“IN” port. The return fluid must never flow
		through a reversing valve.
	Improper hydraulic fluid flow.	Check that 7–12 gpm/26-45 lpm at 1000–
		2000 psi/70–140 bar is available at the trash
		pump. A 20% decrease in flow can result in
		a 50% decrease in pump performance.
	Pump submersed in sediment.	Lift the pump from the bottom of the hole or
		chamber. Use a flat support under the pump
		if necessary.
	Trash pump inlet restricted.	Remove suction screen and thoroughly
		clean. Reassemble.
	Discharge hose kinked or	Straighten the hose. If the hose must bend
	restricted.	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.
	Discharge hose too small.	Use a 3-inch diameter fire hose.
	Water lift too high.	Lower the outlet end of the discharge hose.
		Increase hydraulic flow (12 gpm/45 lpm
		max).
	Impeller worn or damaged.	Check impeller for damage and excessive
		wear. Replace if necessary.
	Pump not matched to application	Obtain higher capacity pump.
	Hose used on suction side of	Remove. Use no plumbing on suction side
	pump.	of pump.
Poor pump performance	Too many solids in the water.	Reduce solids content. Increase pump
with excessive wear.	Water speed out of the hose may	speed.
	be too slow, therefore hose and
	pump load up with solids.
		SM50 User Manual ◄ 13