Multiquip TRASH PUMP (hatz 1B40u-2203a diesel engine) Qp4tZt10p - Manual (Page 21)

qp4TzT10p/TMp16F/TMpXF Trash puMp • operaTion & parTs Manual — rev. #1 (08/29/11) — page 21
Maintenance
puMp vaCuuM TesT
To perform the pump vacuum test do the following:
1. Remove the pump fill cap (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 11, 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 11) 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, reset 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
8. 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.
NOTICE
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.
NOTICE
25 in. Hg. (inches of mercury) translates into 25 feet
of lift at sea level.
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.
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 wears 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.