MULTIQUIP QP40TH Specifications download pdf (Page 20)

PAGE 20 —QP40TH — PARTS & OPERATION MANUAL — REV. #1 (10/01/02)

QP40TH — MAINTENANCE (PUMP)

To perform the pump vacuum test do the following:

1. Remove the pump fill cap, 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 17 (next page), 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 (Figure 17) 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.

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.

Adjusting Impeller Clearance

1. If it is necessary to replace impeller or volute, be sure

clearance between impeller and volute is adjusted

correctly.

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. Remove spark plug

to make it easier to turn impeller.

25 in. Hg (inches of mercury)

translates into 25 feet of lift at

sea

level

NOTE

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.

6. To test the

flapper valve

, shut down 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.

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 1)

and drain any water left in the pump.

2. Loosen the two locking hand knobs (turn counter-

clockwise) 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.

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MULTIQUIP QP40TH Specifications Page 20

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