Waterous Arizona Operations
500-100 & 120-P Operations
Rev 1
Page 20 of 30
B. Pump
Observed
Symptom
Probable
Cause
Suggested Remedy
Pump fails to prime or
loses prime
Air leaks
Clean and tighten all Intake connections. Make sure intake hoses and
gaskets are in good condition.
Use the following procedure to locate air leaks:
1. Connect Intake hose to pump and attach Intake cap to end of hose.
2. Close all pump openings.
3. Open priming valve and operate primer until vacuum gage Indicates 22
in. Hg/.735 atmospheres. (If primer fails to draw specified vacuum, it may
be defective, or leaks are too large for primer to handle.)
4. Close priming valve and shut off primer. If vacuum drops more than 10
in. Hg/.334 atmospheres In 5 minutes, serious air leaks are indicated.
With engine stopped, air leaks are frequently audible. If leaks cannot be
heard, apply engine oil to suspected points and watch for break in film or
oil being drawn into pump.
1. Completely fill water tank (if so equipped).
2. Connect intake hose to hydrant or auxiliary pump.
3. Open one discharge valve and run in water until pump is completely
filled and all air is expelled.
4. Close discharge valve, apply pressure to system and watch for leaks
or overflowing water tank. A pressure of 100 psi is sufficient.
DO NOT EXCEED RECOMMENDED PRESSURE.
1. If pump has not been operated for several weeks, packing may be
dried out.
2. Close discharge and drain valves and cap intake openings.
3. Operate primer to build up a strong vacuum In pump.
4. Run pump slowly and apply oil to Impeller shaft near packing gland.
5. Make sure packing is adjusted properly.
Dirt on Intake strainer
Remove all leaves, dirt and other foreign material from Intake strainer.
When drafting from shallow water source with mud, sand or gravel bottom,
protect intake strainer In one of the following ways:
1 Suspend Intake strainer from a log or other floating object to keep It off
the bottom. Anchor float to prevent it from drifting Into shallow water.
2. Remove top from a clean barrel. Sink barrel so open end is below water
surface. Place Intake strainer Inside barrel.
3. Make an Intake box, using fine mesh screen. Suspend intake strainer
Inside box.
No oil In priming tank
With rotary primer, oil is required to maintain a tight rotor seal.
Check priming tank oil supply and replenish, if necessary.
