Crane Plumbing 8XSE-HA Section E Preventative Maintenance, Section F Service and Repair

D-3.2) Insulation Test:

Before the pump is put into service, an insulation (megger) test should be performed on the motor. The resistance values (ohms) as well as the voltage (volts) and current (amps) should be recorded on the start-up report.

D-3.3) Pump-Down Test:

After the pump has been properly wired and lowered into the basin, sump or lift station, it is advisable to check the system by filling with liquid and allowing the pump to operate through it’s pumping cycle. The time needed to empty the system, or pump-down time along with the volume of water, should be recorded on the start-up report.

SECTION E: PREVENTATIVE MAINTENANCE

As the motor is Air-filled, no lubrication or other maintenance is required, and generally Barnes Pumps will give very reliable service and can be expected to operate for years of normal sewage pumping without failing. However, as with any mechanical piece of equipment a preventive maintenance program is recommended and suggested to include the following checks:

1)Test moisture detector control “Test Switch” for continuity of circuit. Water in the seal chamber will

energize a seal leak warning light at the control panel. This is a warning light only and does not stop the motor. It indicates the seal has leaked and must be repaired. This should be done within 2 or 3 weeks to prevent further damage. See section D-2.3.

2)Inspect impeller and body for excessive build-up or clogging and repair as required per section F-1.

3)Inspect outer shaft sealÿand replace as required per section F-2.

4)Check motor for ground leakage and proper amp draw. Motor and inner seal repair per section F-3.

SECTION F: SERVICE AND REPAIR

NOTE: All item numbers in ( ) refer to Figures 7 & 8.

WARNING ! - Electrical power to the pump motors must be disconnected and locked out to prevent any dangerous electrical hazards or personnel danger before any service work is done to the pump.

CAUTION ! - Operating pump builds up

heat and pressure; allow time for pump to cool to room temperature before handling or servicing.

F-1) Impeller and Volute Service:

F-1.1) Disassembly and Inspection:

To clean out the pump body (1), or clean out or replace impeller (7), or replace wear ring (1F) and impeller ring (8), disconnect power, remove hex nuts (5) and vertically lift motor assembly from the pump body (1), and then lift out back plate (12). Clean out the pump body, if necessary, examine wear ring (1F) and replace if worn. If the wear ring (1F) requires replacing, split the wear ring (1F) and remove, be careful not to damage the suction cover (1E). Clean and examine impeller

(7)for pitting or wear, also check impeller ring (8) for scaring or excessive wear, replace if required.

NOTE: If impeller (7) is replaced, also replace impeller ring

(8). If only the impeller ring (8) requires replacing, split the ring and remove, be careful not to damage impeller.

To remove Impeller (7), removing cap screw (10) (or nut) and washer (9) (and spring washer (11) if so equipped). The impeller is keyed onto the shaft with a square key (6) and to remove, pull impeller straight off the shaft using a wheel puller if required. Inspect gasket (1H) if suction cover (1E) has been removed, and replace if cut or damaged. Before reinstallation, check the motor shaft and impeller bore for damage.

F-1.2) Reassembly:

To install wear ring (1F) first apply retaining compound to the bore of suction cover (1E) and then press wear ring (1F) into bore of suction cover (1E) until seated. Position gasket (1H) on volute, and locate suction cover (1E) on volute (1), apply thread locking compound to socket head screws (1D)ÿand tighten into volute (1). To install impeller (7), first apply retaining compound to groove at bottom of impeller and press impeller ring (8) on impeller (7), then apply a thin film of oil to motor shaft and slide impeller straight onto shaft, keeping keyways lined up. Drive key (6) into keyway. Locate spacer (9), and Lock-spring washer (11) on shaft, apply thread locking compound to cap screw (10) threads, thread cap screw (10) into shaft and torque to 35 ft. lbs. Rotate impeller to check for binding.

Install impeller and motor assembly over studs and onto volute (1). Apply thread locking compound to threads of each stud (3). Position lockwasher (5) on studs (3) and thread nut (4) onto stud (3) and torque to 24 ft. lbs. Check for free rotation of motor and impeller.

F-2) Outer Shaft Seal Service:

CAUTION! - Handle seal parts with extreme care. DO NOT scratch or mar lapped surfaces.

FIGURE 4

10