Multiquip AP6 Series - Manual (Page 48)

PAGE 48 — AP6/AP8 SERIES TRASH PUMPS • OPERATION AND PARTS MANUAL — REV. #0 (06/11/14)
MAINTENANCE (PUMP)
PUMP MAINTENANCE
To ensure longer pump life and service, please follow the
pump maintenance guidelines as listed in Table 16 and on
preceding pages.
DRY PUMP VACUUM TEST
1. To perform the pump vacuum test do the following:
2. Perform all start-up steps without installing the hoses.
3. Block the suction with a plug or heavy rubber flap as
shown in Figure 38. An accurate vacuum gauge should
be installed in the plug or flap to check vacuum system
performance and pump vacuum gauge.
4. Place the ball valve on side of suction chamber in the
CLOSED position, this will isolate the venturi.
5. Start the engine and run at 1,800 RPM. Note the
maximum vacuum reading.
Table 16. Pump Maintenance
Interval Check
Daily
Check bearing housing.
Check mechanical seal oil reservoir.
Check vacuum pump seal oil reservoir.
Check water level in vacuum system and
anti-freeze concentration for weather
conditions.
Check for leaks and kinks in discharge hose.
Check pump volute. Flush with clean water.
Check strainer.
Every 250 Hours
Check if water is clean and anti-freeze is right
for conditions in vacuum system.
Check oil reservoirs for bearings, pump seal
and vacuum pump seal for contamination,
drain, and replace if necessary.
Check impeller bolt for tightness.
Every 500 Hours
Flush vacuum system water tank and fill with
clean water. Add antifreeze if necessary.
Check impeller condition and clearance. Adjust
clearance as needed.
Every 1000 Hours
Change oil in pump seal, pump bearing
housing, and vacuum pump seal reservoirs.
Inspect discharge check valve for wear.
Replace if necessary.
Every 2000 Hours Grease vacuum pump bearings.
6. Shut off the engine and check the vacuum reading.
The vacuum reading should be .75 to .9 bar or 25 to
27 in. hg. Vacuum reading should hold for about 3 to
10 minutes before dropping to zero.
7. If vacuum reading drops fast, check for leaks and repair
if necessary. Listen for leaks. If area is quiet, small air
leaks should be easy to hear.
Figure 38. Dry Pump Vacuum Test
NOTICE
The vacuum test will indicate the condition on the
impeller and wear ring. If this test fails, the pump must
be disassembled, and the impeller and wear ring
must be inspected for wear and clearance tolerances.
Reference replacing the impeller procedure in the
maintenance section of this manual.
-15
-30
-1
0
-5
in. Hg
kPa
WIKA
R
-100
-80
-60 -40
-20
PUMP VACUUM TESTER
25 IN. HG TRANSLATES
INTO 25 FEET OF LIFT
AT SEA LEVEL.
PLACE VACUUM TESTER
OVER PUMP INLET.
-25
-20
ACCEPTABLE READING
SHOULD BE BETWEEN
-27 AND -25 IN. HG.
(In. Hg = INCHES
OF MERCURY)
PUMP
VACUUM
TESTER