4
PO-1775F
III. PUMP OPERATING INSTRUCTIONS
1. Fill the system with liquid before starting. Do not run the pump
dry; damage to the mechanical shaft seal may result. There are
no points on the pump which need lubrication. The mechani-
cal shaft seal is self lubricating, and designed to handle clean
liquids.
2. Make certain all pipe or hose connections are air tight. An air leak
in the suction line under ‘flooded suction’ operations will reduce
flow. An air leak in the suction line on a ‘suction lift’ installation
will prevent operation.
3. Always place the pump as close to the liquid to be pumped as
possible. Keep all lines as short and straight as possible. Avoid
sharp bends in hoses. Keep the pump on a level foundation.
4. If flexible hose must be laid across a roadway, protect it with
planking. Instantaneous shut off pressures applied when a
vehicle runs across an unprotected hose will cause “hydraulic
shock”. This shock can damage the pump and/or damage the
hose. See Figure #1.
5. When pumping dirty water or other liquids which may contain
solids, always use a pump strainer specified by the manufac
-
turer on the end of the suction line. In the case of ‘suction lift’
conditions, the strainer will have to be a combination foot valve
and strainer.
6. Drain the pump whenever there is danger of freezing.
7. Always use rubber feet under portable pump when operating
on a hard surface. This will prevent damage to the pump and
power unit.
8. Always flush out the pump at the end of operation if the liquid
being pumped may leave a solid or sticky residue in the pump.
If this is not done, damage to the pump may result.
IV. PUMP TROUBLE SHOOTING AND REPAIR
PROBLEM
1. Pump does not produce flow or has insufficient flow.
POSSIBLE CAUSE
a. Pump and suction line not completely filled. See Section I,
paragraph #18.
b. Leak in suction line.
c. Foot valve and strainer not completely immersed.
d. Mechanical shaft seal leaking air.
e. Impeller rotation incorrect (impeller should rotate counterclock-
wise when viewing through suction end).
f. Impeller speed (RPM) too low.
g. Worn impeller and/or volute. See Section V, paragraphs 4, 5,
and 6.
V. Pump Disassembly and Repair
NOTE: Pump may be disassembled and repaired using simple
“screwdriver maintenance”. See exploded view drawing at end
of manual for item numbers mentions.
1. Remove the six ¼” volute screws and nuts (items 21 & 4) and
remove the volute (item 17).
. Remove the large o-ring (item 7) from around the bracket (item
6).
3. Unscrew the impeller screw (item 16) and remove it along with
the small o-ring (item 8). Slide the impeller (item 16) and key
(item 7) off the shaft. (To facilitate removal of impeller, gently
force two screwdrivers 180° apart under the back of the impeller
and gently pry the impeller off the shaft).
NOTE: Impeller shims (item 30) may or may not have been used
on your pump. Check for these and save them for reuse.
4. One-half of the shaft seal (item 14) is in the impeller hub (item
15), and the other half (item 13) is mounted in the bracket (item
6) where the shaft protrudes. Only remove the impeller portion
of the seal and the bracket portion of the seal if you intend to
replace both seal elements with new parts. Always protect the
sealing surfaces from nicks, scratches and dirt.
5. Remove the four bracket screws (item 9) and the four small
o-rings (item 8), one on each screw. The bracket (item 6) may
now be removed. The bracket (stationary) portion of the shaft
seal (item 13) may now be
pressed
out from the backside of
the bracket. Use a round wooden plug 1-3/16” in diameter and
carefully press the seal out straight. If it is to be reused, carefully
check the face for nicks or scratches. If no damage is evident,
carefully store for reinstallation. Save the o-ring (item 11) which
surrounds the seal.
NOTE: If plugs (item 1) are installed over the bracket screw
heads (item 9), remove by screwing a volute screw (item 1)
into the plug and carefully pulling out.
Be careful not to strip
the threads which the screw forms in the plug.
REASSEMBLY
- READ THE FOLLOWING INSTRUCTIONS BE
-
FORE REASSEMBLY.
Reassembly involves putting the pump together in the reverse
order of the disassembly sequence described above.
FIGURE 1
LAY STURDY PLANKING ALONG
EACH SIDE OF THE HOSE WHEN
THE HOSE RUNS ACROSS ROADWAYS.
