3
MAINTENANCE
(a) LUBRICATION:
1)
The pump requires no lubrication.
2)
For gasoline or diesel engines, refer to the instructions
provided by the engine manuafacturer.
(b) REPLACING SEALS:
To disassemble:
1)
Remove four nuts (8) and washers (23) and dismount
the front casing (1).
2)
Remove the volute (7).
3)
Inspect the seal (11) on the suction side of the volute.
It should be replaced if damaged.
4)
Check ‘O’ Ring (10) in the groove of the front casing
(1). It should be replaced if damaged.
5)
Unscrew the impeller (2) in a counter-clockwise direc-
tion.
6)
Slip the rotating seal (12) with the sleeve (13) off of the
engine shaft.
7)
Inspect the ceramic seat (12A) fixed in the rear casing
(3). If it is worn or damaged, it should be replaced.
Unbolt the rear casing from the engine and push the
ceramic seat out of its housing in the rear casing from
the engine end. Care must be taken so that the shaft is
not damaged in the process.
To reassemble:
1)
Clean all parts thoroughly before reassembly.
2)
Oil the rubber cup on the ceramic seat (12A) and push
it into the rear casing groove using thumbs only. Make
sure that the smooth surface of the ceramic seat faces
outwards.
3)
Assemble the rear casing (3) to the engine being very
careful so as not to damage the ceramic seat. Do not
forget the lock washers or washer seals when assem-
bling the rear casing to the engine.
4)
Slide the rotating seal (12) onto the sleeve and then
slide the sleeve onto the shaft.
5)
Screw on the impeller (2).
6)
Position the volute (7) into the rear casing so that it
seats properly into the location diameter of the rear
casing. The volute is prevented from rotation by its
anti-rotation rib which seats into the slot on the side of
the rear casing. It may be necessary to tip the pump
rearwards to keep the volute in position until the front
casing is in position.
7)
Slide the seal (11) on the shoulder of the volute.
8)
Place the ‘O’ Ring into the groove of the front casing.
9)
Assemble the front casing with the rear casing.
CAUTION
•
Whenever the pump is dismantled and then reassembled,
always check to see that the impeller rotates freely within the
volute.
•
All models have a flinger on the shaft (14). This flinger must
not be removed.
PROBLEM
CAUSE
• No discharge
1) Pump not properly primed.
2) Speed to low.
3) Suction lift greater than that for which the pump was designed.
4) Discharge too high.
5) Collapsed or plugged suction hose.
• Reduced capacity and/or head
1) Air leaks in suction line.
2) Clogged impeller.
3) Strainer or foot valve not properly submerged.
4) Excessively worn impeller.
5) Speed too low.
6) Suction lift too great or insufficient NPSH. NPSH, Net Positive
Suction Head is the total suction head in feet of liquid (absolute) less
the vapor pressure of the liquid in feet (absolute).
7) Partially collapsed or plugged suction line.
• Pump loses prime
1) Air leaks in suction line.
2) Excessive amount of air or gas in liquid.
3) Loose seal (11) due to shrinkage or damage.
4) Suction pipe insufficiently submerged.
5) Suction lift too great.
6) Check if valve may be worn or have dirt lodged between the rubber
flap and the valve seat. This prevents the valve from retaining a
sufficient amount of water in the casing for proper priming.
• Excessive power consumption
1) Speed too high.
2) Specific gravity or viscosity of liquid too high.
• Noise
1) Suction and discharge piping not properly supported and anchored.
2) Cavitation - check NPSH.
TROUBLESHOOTING CHART
