MULTIQUIP QP4TH Specifications download pdf (Page 20)

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

PUMP VACUUM TEST

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.

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.

NOTICE

25 in. Hg (inches of mercury) translates into 25 feet of

lift at sea level.

MAINTENANCE (PUMP)

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.

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.

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 (turn

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.

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.

CAUTION

The impeller may develop sharp edges. Use extreme

care when cleaning around the impeller to prevent

being cut..

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MULTIQUIP QP4TH Specifications Page 20

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