MYERS E110-14, Инструкции по безопасности, Страница: 13 / 20

26850A003
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12. Lack of sufficient oil in crankcase can quickly
cause failure of pump power end and result in
extensive repairs. Oil level should be checked
periodically during normal operation as well as when
maintenance work of any nature is performed.
Insufficient oil will first be indicated by excessive
heat and should be corrected immediately.
13. A foaming mixture will sometimes have the same
effect as a small air leak in the suction line. This is
because various quantities of the foam are drawn
through the suction line into the pump disrupting the
normal flow of water.
14. Pressure regulators may become sluggish in action
due to the plunger sticking or fitting too tightly in its
cylinder. This condition may be caused by an
accumulation of chemicals collecting in and around
the plunger, or may be due to excessive corrosion
of the plunger parts. To check this condition,
remove and clean the plunger. After cleaning the
plunger, parts should be covered with a waterproof
grease before assembling.
In some cases there is a tendency for the pressure
regulator to chatter or vibrate excessively. This is
an indication of unstable operation due to nozzling
in the high or low capacity range of the regulator; the
nozzling requirements should be at least 50% and
not exceed 90% of pump capacity.
Due to nozzle wear, the system requirements may
exceed the 90% limit, resulting in cycling or ham-
mering of the regulator. This can readily be checked
by replacing the worn nozzle.
15. If a large piece of foreign matter becomes lodged
between a pump valve and valve seat or if some-
thing of this kind becomes wedged in so that it
prevents the valve from operating normally we can
expect a drastic drop in capacity and considerable
surge or pulsation will be noticed in the discharge
line. To correct a condition of this kind it is usually
necessary to examine each valve in the pump until
the offending condition is located. The use of clean
liquid and seeing that the suction strainer is in
proper condition will prevent trouble of this kind.
16. Noisy pump operation will sometimes be caused by
a piston rod being loose in the crosshead. This will
only become evident after the rod becomes so
extremely loose that some end motion can be found
between the rod and crosshead. A noise of this
kind usually has a regular cadence timed with each
stroke. When this condition occurs it is always
necessary to replace both the rod and the cross-
head.
17. More than the recommended amount of preload to
the crankshaft bearings will reduce bearing life,
require more power, and generate more heat. Less
than the recommended preload may cause a knock
timed with the crankshaft rotation. Check for loose
bolts on the crankshaft end caps or adjust shims to
obtain proper bearing preload.
Worn roller bearings will continue to run for a long
time but will introduce wear particles into the oil
(which can cause other damage), may cause
overheating, and may or may not cause a notice-
able noise. Check oil regularly, check for wear
particles when changing oil.
UNUSUAL CONDITIONS WHICH MAY CAUSE
TROUBLE
Pinion shaft breakage on the drive side of the pump
may be caused by having the pulley or sprocket
positioned too far away from the pump bearing. It may
also be caused by a loose drive chain if the pump is
chain driven.
If the V-belts have a tendency to wear rapidly, it may be
due to having the belt tightener pulley adjusted too far
into the belt, throwing a reverse bend in the belt where it
passes over the pulley. If very much reverse angle
seems necessary to keep the belt tight, other provi-
sions should be made for tightening, such as placing
shims under the pump base or otherwise spreading the
drive centers enough to take up the belt length. On
multiple V-belt drives, a complete set of belts should be
installed when making a replacement. Further, all the
belts in one set should be checked for length and
accurately matched to avoid placing an undue load on
any one belt.
F. E. Myers, 1101 Myers Parkway, Ashland, Ohio 44805-1969
419/289-1144, FAX: 419/289-6658, www.femyers.com
Myers (Canada), 269 Trillium Drive, Kitchener, Ontario N2G 4W5
519/748-5470, FAX: 519/748-2553
CALL 1-800-577-8111 FOR SALES AND SUPPORT