WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 29
MAINTENANCE
PUMP VACUUM TEST
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 operation section,
and wait for the pump to begin pumping.
3. As shown in Figure 29, 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 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 correctly, and corrective action needs
to be taken.
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.
NOTICE
25 in. Hg (inches of mercury) translates into 25 feet of
lift at sea level.
PLACE
VACUUM TESTER
OVER PUMP
SUCTION PORT
ACCEPTABLE
READING SHOULD BE
BETWEEN
-25 AND -20 IN. Hg.
25 IN. Hg.
TRANSLATES
INTO 25 FEET
OF LIFT AT
SEA LEVEL
DISCHARGE PORT
Figure 29. Pump Vacuum Test
NOTICE
Vacuum test may be performed without water flowing
through the discharge port. However, it is recommended
to have water flowing to prevent any heat-up.
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