Waterous 500-100-P, Руководство по эксплуатации

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Waterous Arizona Operations 500-100 & 120-P Operations Rev 1
Page 22 of 30
Observed
Symptom
Probable
Cause
Suggested Remedy
Insufficient capacity
B. Engine and pump
speed higher than
specified for desired
pressure and
volume
(continued)
Transfer valve set
Improperly
(Does not apply to single
stage pumps.)
Place transfer valve In VOLUME (parallel) position when pumping more than
two thirds rated capacity.
When shifting transfer valve, make sure it travels all the way Into new
position. Failure of transfer valve to move completely into new position
will seriously impair pump efficiency.
Pump Impeller(s) or wear
rings badly worn
Install undersize wear rings if Impeller to wear ring clearance is within limits
indicated in MAINTENANCE INSTRUCTIONS. If not, install new
impeller(s) and wear rings.
Intake strainer, Intake
screens or impeller
vanes fouled with
debris
Remove intake strainer and hose, and clear away all debris.
Pressure backwash (preferably in parallel or "volume" position) will usually
clear impeller vanes when pump Is stopped.
Intake hose defective
On old intake hoses, the Inner liner sometimes becomes so rough it causes
enough friction loss to prevent pump from drawing capacity. Sometimes,
the liner will separate from the outer wall and collapse when drafting. It Is
usually Impossible to detect liner collapse, even with a light. Try drafting
with a new intake hose; if pump then delivers capacity, It may be
assumed that previous hose was defective.
Intake hose too small
When pumping at higher than normal lifts, or at high altitudes, use a larger
or additional Intake hoses.
Insufficient capacity
C. Engine speed
higher than
specified for desired
pressure and
volume
Truck transmission in too
low a gear
Consult vehicle instructions for correct pumping gear.
Pump usually works best with transmission in direct drive.
(Check both engine and pump speed, if possible, to be sure transmission Is
in "direct".)
Insufficient pressure
Pump speed too low
In general, the above causes and remedies for low pump capacity will also
apply to low pump pressure.
Check pump speed with a tachometer.
If pump speed is too low, refer to engine manufacturer's instructions for
method of adjusting engine speed governor.
Pump capacity limits pump
pressure
Do not attempt to pump greater volume of water at the desired pressure
than the pump is designed to handle.
Exceeding pump capacity may cause a reduction In pressure.
Exceeding maximum recommended pump speed will produce cavitations,
and will seriously Impair pump efficiency.
Flap valve stuck open
When pump Is In PRESSURE (series), discharge will bypass to first stage
Intake. Operate pump at 75 psi/52 bar, and rapidly switch transfer valve
back and forth between positions.
If this falls, try to reach valve with a stick or wire and work it free.