MYERS E110-14, Инструкции по безопасности, Страница: 11 / 20

26850A003
11
Explanation of the Service Chart
1. Pump priming is usually not necessary when the
pump is installed correctly. However, there are
certain unusual conditions which may make it
necessary to prime the pump to get the pumping
action started. Priming will be required under
conditions where it is impossible for the piston to
displace the air in the pump and replace it with
water. This could be caused by a high suction lift
(high from the water supply to the pump), the valves
being stuck on the seat, such as after pumping a
sticky fluid, or it might be caused by valves sticking
due to extreme corrosion of the valves and seats.
A pump will not prime readily if someone has
tampered with the valve springs causing them to
exert undue pressure of the valve plates against the
valve seats. When the pump appears to need
priming this condition can be checked by pouring
water into the cylinder body through one of the valve
cap openings or into the pump discharge opening at
the same time operating the pump to work the water
into the cylinder and valve passages.
2. Frequently a gate valve is installed in the suction
line between a tank or pressure line and pump
sediment chamber. This valve is usually installed in
the line to shut off the supply source for cleaning
sediment chamber or for pump repairs.
If this valve is closed or even partially closed it will
interfere with the flow of water to the pump suction
to such an extent that the pump will not perform to
full capacity. If the valve is partially closed it may
cause severe knocking and vibration of the pump
because the water cannot flow into the cylinder
cavities fast enough.
3. A sediment chamber should be installed in the
suction line between the gate valve and the pump
suction.
The strainers in these sediment chambers are of
more than adequate capacity to allow a free flow of
the liquid to the pump. However, because of its
normal function of collecting sediment the strainer
may become severely clogged and in some cases,
it will completely stop the flow of liquid to the pump.
The length of time the pump may operate before it
is necessary to clean the strainer will depend upon
the type of liquid pumped. After the pump has been
used a short period the operator will soon become
familiar with the amount of running time between
strainer cleanings.
WARNING : THIS PUMP MUST BE INSTALLED WITH A PRESSURE RELIEF VALVE IN DISCHARGE LINE
SERVICE CHART
SERVICE PROBLEM
A. Failure of pump to build pressure with discharge closed
B. Failure to hold pressure with discharge open
C. Pump is noisy
D. Pump gets hot
E. Pressure gauge shows abnormal fluctuation
POSSIBLE CAUSE OF PROBLEM E D C B A
1. Pump not primed X
2. Valve closed in suction line X X
3. Suction line or sediment chamber clogged X X X
4. Air leak in suction line X X X
5. Pressure regulator valve badly worn or not properly adjusted X X
6. Broken valves or springs X X X
7. Pump packing or valves badly worn X X X
8. Pressure regulator bypassed by open #1 valve X X
9. Pump cylinder body cracked X X X
10. Water in crankcase X
11. Worn connecting link inserts or wrist pin bushings X X
12. Lack of oil in crankcase X X
13. Foaming mixture in tank X X X
14. Regulator plunger sticking X
15. Foreign matter under pump valve X X X
16. Loose plunger rod X
17. Improper preload of crankshaft bearings X X
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