BJM Pumps PGV220-575T User Manual
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6) Water leakage into oil chamber
Worn or abnormal shaft seal
Considerably worn or
vital
abnormality.
Replace the shaft seal.
7) Water leakage into motor chamber
Worn or abnormal shaft seal
Refer to (6)
Loosened cable packing gland
Re tighten
Tear cable
Repair or replace a torn portion.
Where water has leaked into the
motor chamber, stator and rotor
must be inspected to check for their
abnormality and, in many cases, re-
dried. Checking by electric
technician is preferred.
Inspection immediate after operation-start- This inspection is performed to judge the
sealing performance of the shaft seal. Carry out this inspection about one week after
startup of the operation.
1. Oil chamber check- The sealing performance can be judged by contamination
degree of the sealing oil depending on the quantity of water leakage into the oil
chamber.
•
The upper oil box located at the center part of the pump is provided with
two oil plugs spaced at 180° from each other (one is located upside from
the shaft center and other located downside from the shaft center) as
illustrated in Fig. 3.
•
As illustrated in Fig. 3, locate a proper chute and a proper oil pan just
under the downside plug to discharge the oil from the oil chamber.
•
After that, unscrew off the plug to discharge and take the oil into the oil
pan.
•
When oil flow from the chamber is not smooth, unscrew off the upside
plug to intake the air into the chamber.
•
Use a transparent oil pan.
•
Take (sample) a small quantity of oil into the pan. (Small quantity is
sufficient for oil analysis).
•
The sampled oil looks like cloudy emulsion when the mixture ration with
leaked water is small and is separated from the water when it is 5% and
over.
•
Inspect the sampled oil based on the above criterion and determine further
periodic oil inspection interval according to the obtained result.
2. Recommended oil brand-When the oil must be replaced with fresh one upon
above inspection or further periodic inspection, use the oil recommended below.
ISO 32 NSF Food Grade Mineral Oil