Stanley Black & Decker SM50 Preoperation Procedures, Pump Operation, Cold Weather Operation

OPERATION

PREOPERATION PROCEDURES

CHECK POWER SOURCE

1.Using a calibrated flow meter and pres­sure gauge, make sure the hydraulic power source develops a flow of 7–12 gpm/26–45 Ipm at 1000–2000 psi/70–

140 bar.

2.Make certain that the power source is equipped with a relief valve set to open at 2100 psi/145 bar maxi- mum.

3.Make certain that the power source return­ pressure does not exceed 250 psi/17 bar.

4.Make sure the trash pump inlet is clear of debris. Remove any obstruction before operating. Refer to

PUMP CLEANING PROCEDURES.

CONNECT HOSES

1.Wipe all hose couplers with a clean lint­ free cloth before making connections.

2.Connect the hoses from the hydraulic power source to the couplers on the trash pump or trash pump hoses. It is a good practice to connect return hose first and disconnect it last to minimize or avoid trapped pressure within the trash pump motor.

NOTE:

If uncoupled hoses are left in the sun, pressure in- crease inside the hoses might make them difficult to connect. Whenever possible, connect the free ends of the hoses together.

3.Observe the arrow on the couplers to ensure that the flow is in the proper direction­. The female coupler on the trash pump is the inlet (pressure) coupler.

PUMP OPERATION

1.Observe all safety precautions.

NOTE:

The SM50 is not designed for use with a suction pipe inlet. The diameter of the suction screen at the bottom of the pump provides maximum pump ef- ficiency. Reducing the size of this inlet will greatly reduce pump performance.

2.Connect a hose fitted with a 3 inch/76.2 mm female camlock coupler to the pump outlet fitting. Make sure the fitting is securely tightened. For best perfor- mance, keep the hose as short as possible and lay it out to avoid sharp bends or kinks.

3.Lower the pump into the liquid to be pumped. Locate the outlet end of the discharge hose to disperse the liquid as required. Remove any kinks from the hose to assure maximum water flow.

10 ► SM50 User Manual

IMPORTANT

Never point the hose at bystanders.

4.Turn on the hydraulic power source. Watch for sol- ids in the liquid being pumped. If solids are exces- sive, the discharge flow might decrease. If this hap- pens, stop the pump and check for the cause of the problem.

Under some conditions, the liquid being pumped might be slowed enough so It can no longer push particles in the liquid. If this happens, particles can accumulate in the hose and backup the pumping chamber, causing further restriction. The impel- ler then acts as a “grinding wheel which causes acceler­ated pump wear. Reduced liquid flow can be caused by the following:

•The pump sinks into solids at the bottom of the hole.

•The end of the outlet hose is too high, causing an excessive lift height for the column of liquid being pushed by the trash pump. This slows the flow of liquid to a level where it can no longer carry solids out the end of the hose.

•The flow and pressure of hydraulic fluid to the pump is too low, which re­duces impeller speed.

A 20% decrease­ in hydraulic fluid flow can re- duce pump performance by 50%. When operat- ing at reduced hydraulic flow and pressure, the end of the outlet hose should not be more than 30 ft/9 m above the liquid.

5.When pumping is complete, set the hydraulic­ control valve to the “OFF” posi­tion. Lift the pump from the work area.

COLD WEATHER OPERATION

If the trash pump is to be used during cold weather, preheat the hydraulic fluid at low power source speed. When using the nor­mally recommended fluids, fluid should be at or above 50 °F/10 °C (400 ssu/82 centi- stokes) before use.

Damage to the hydraulic system or pump motor seals can result from use with fluid that is too viscous or thick.