Multiquip QP4TH Maintenance Pump, Pump Vacuum Test, Adjusting Impeller Clearance, Pump Cleaning

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MAINTENANCE (PUMP)

PUMP VACUUM TEST

CAUTION

DO NOT attempt to start the engine unless the pump has previously been primed with water. Severe pump damage will occur if pump has not been primed.

To perform the pump vacuum test do the following:

1.Remove the pump fill cap (See Figure 3), and fill the pump with water.

2.Start the engine as outlined in the initial start-up section, and wait for the pump to begin pumping.

3.As shown in Figure 18, place a water hose inside the discharge opening of the pump, and turn on the water. This flow of water into the discharge opening will prevent the pump from running dry.

4.Place the Pump Vacuum Tester (P/N 7000030) over the pump suction (inlet) opening (See Figure 18) with the vacuum gauge facing upwards. It may be necessary to apply a small amount of water around the rubber seal of the vacuum tester to make a good suction fit.

5.Check and make sure that there are no air leaks between the vacuum tester and the inlet port on the pump. If air leaks are present reseat vacuum tester.

6.Run the pump for a few minutes while monitoring the vacuum gauge. If the gauge indicates a reading between -25 and -20 in. Hg. (inches of mercury) then it can be assumed that the pump is working correctly.

NOTICE

25 in. Hg (inches of mercury) translates into 25 feet of lift at sea level.

7.If the vacuum tester gauge indicates a reading below -20 in. Hg, it can then be assumed that the pump is not functioning correctly, and corrective action needs to be taken.

8.To test the flapper valve, shutdown the engine. The vacuum tester should remain attached to the pump suction inlet port by vacuum.This indicates the pump's flapper valve is seating properly to hold water in the suction hose when the engine is stopped.This prevents backflow and allows for faster priming when the engine is restarted.

ADJUSTING IMPELLER CLEARANCE

1.If it is necessary to replace impeller or volute, be sure clearance between impeller and volute is adjusted

2.The impeller should be as close to the volute as possible without rubbing against it. Clearance is adjusted by adding or removing shims from behind the impeller.

3.Check clearance between impeller and insert by slowly pulling starter rope to turn impeller.

NOTICE

It is important not to remove too many shims or the clearance between the impeller and volute will become too wide and pump performance will be reduced. Remember as the impeller wear down, additional shims may be required to maintain the clearance between the impeller and insert.

4.Check the impeller every six months for wear, and for clearance between the impeller face and the volute. Also check the shaft seal for wear, as well as the shaft sleeve.

PUMP CLEANING

After pumping water containing large amounts of dirt and debris, perform the following:

1.Remove the drain plug from the pump housing (Figure 3) and drain any water left in the pump.

2.Loosen the two locking hand knobs (tur n counterclockwise) and remove clean-out cover.

3.Clean and remove dirt, debris from pump casing. Inspect impeller and volute for wear. Replace any damaged or worn parts.

CAUTION

The impeller may develop sharp edges. Use extreme care when cleaning around the impeller to prevent being cut..

PAGE 20 — QP4TH TRASH PUMP • OPERATION AND PARTS MANUAL — REV. #3 (01/29/14)

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Contents Model QP4TH This Manual Must Accompany the Equipment AT ALL TimesProposition 65 Warning QP4TH Trash Pump Operation and Parts Manual REV. #3 01/29/14 Table of Contents QP4TH Centrifugal PumpParts Ordering Procedures Ordering parts has never been easierSafety Information Safety MessagesGeneral Safety Pump Safety„ Never open the priming plug when pump Serious damage to the equipment or engineBefore servicing equipment Engine SafetyFuel Safety „ Use well-insulated gloves when picking up the battery Battery Safety Electric Start onlyTransporting Safety Emissions Information Label must remain with the engine for its entire lifeSpecifications Pump Specifications PumpDry Net Weight ModelHonda GX340K1QA2 Specifications EngineSpecifications Engines General Information Pump Components Discharge Port Connect a 4-inch discharge hose to this portMuffler Used to reduce noise and emissions Basic EngineInitial Servicing Inspection Engine Before StartingOil Type SeasonSetup Place the engine ON/OFF switch See in the on position OperationStarting the Engine Place the engine fuel valve lever See to the on positionPlace the fuel shut-off lever See in the OFF position Stopping the EngineAlways run engine at full speed while pumping Maintenance Pump Adjusting Impeller ClearancePump Cleaning Pump Vacuum TestPump Vacuum Tester Maintenance Engine Engine MaintenanceEngine Maintenance Schedule First EveryEngine AIR Cleaner DailyWeekly Engine OILSpark Arrester Cleaning Spark Arrester RemovalStorage Pump StorageTroubleshooting Engine Engine TroubleshootingSymptom Possible Problem Solution Difficult to start Operation not satisfactorySymptom Possible Problem Solution Troubleshooting ENGINE/PUMPPump Troubleshooting Sample Parts List Explanation of Code in Remarks ColumnSuggested Spare Parts Qty DescriptionPump Assembly 1466000130 14660407000482200240 0641400430Pump Assembly 1466251241 02054501000401450100 0451250080Engine Service Parts 17672ZE2W01 17672Z4H02017620ZH7023 17620Z4H020Terms and Conditions of Sale Parts Freight PolicyQP4TH Trash Pump Operation and Parts Manual REV. #3 01/29/14 HERE’S HOW to GET Help
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