Hale Rear Mount - Manual (Page 4)

5. Open throttle gradually until the desired pressure is reached. Regulate valve for
cooling engine and set the pressure governor or relief valve. As the throttle is
opened, the pressure should build up as the engine speed increases. Should the
engine speed go up without a corresponding increase in pressure, the pump is
cavitating or “running away” from the water. There are two possibilities that can lead
to this condition.
a. The first can occur only on high vertical lifts with several short lines. Having large
tips and thereby pumping large volumes. The remedy for this is to reduce flow.
b. The second occurs when pumping air with water due to air leaks. Even though
primed, air leaks can cause rough operation and an increase of engine speed
without a corresponding increase in the pressure. If this is the case, eliminate air
leak as described under maintenance.
If a shutdown is needed when working from draft – for changing discharge hose or for any
other reason – simply lower the pressure to about 30 Psi and close discharge valves.
Closing the discharge valves will prevent pump from losing its water if there are no air leaks.
To resume pumping, simply open the discharge valves and throttle. If the pump gets hot
from continued churning without flow, open a discharge valve periodically to release hot
water or disengage pump.
WORKING FROM BOOSTER TANK
1. Close all pump discharges.
2. Open the valve between the tank and pump suction.
3. With engine at idle, engage pump.
4. Engage priming pump, prime and proceed as described under “Working from Draft”.
5. When pumping from tank, avoid cavitation. Small suction piping will not handle large
volumes.
FINAL TEST BEFORE HOUSING PUMPER
After the instructions on maintenance and lubrication have been followed, close all discharge valves
booster line valves and drain valves. Tighten suction caps. Engage pump and prime until compound
gauge shows about 20 inches of vacuum. If vacuum falls more than 10 inches in 10 minutes, it is
an indication of an air leak which must be eliminated before pump can be considered in serviceable
condition. Air leaks may often be detected by ear if the engine is stopped.
It is advisable to test the suction hose by this same method at frequent intervals. This can be done
by attaching the suction hose to the pump and placing suction tube caps on end of suction hose in
place of strainer.
If air leaks can not be detected by the above vacuum test, it is advisable to test the pump
hydrostatically. To do this, connect the pump to a source of water, such as a hydrant, and look for
leaks
NOTES
Air leaks will cause high engine speed in relation to pressure.
Foreign matter in impellers will cause high engine speed and less than normal volume.
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