Page 4 - Troubleshooting Paper Mill Hydraulics Sample Excerpt 2

No. 3 P.M. Winder Power Supply and Rider Roll

become greater resulting in higher case flow. Thus case flow will
increase as the pump becomes more worn. The most effective way to
track pump wear is by measuring the amount of case flow. When
relatively new, case flow should be approximately 1 – 3%, or about
.47 – 1.4 GPM, of the total output. If case flow increases to as much
as 10% of the total pump volume, or about 4.7 GPM, the pump should
be replaced. The case drain line can be removed and ported into a
5-gallon bucket to check the flow rate. A flow meter has been installed
in the case drain line for convenient regular measurement of case
flow.

2 Flow Meter

This flow meter will provide a visual indication of the amount of oil that
is bypassing inside the no. 1 pump. Normally 1-3 % of the maximum
pump volume, or about .47 – 1.4 GPM, should be indicated by this
meter. When the bypassing increases to 10% of the maximum pump
volume, or about 4.7 GPM, the pump should be changed.

2A Flow Meter

This flow meter will provide a visual indication of the amount of oil that
is bypassing inside the no. 1A pump. Normally 1-3 % of the maximum
pump volume, or about .47 – 1.4 GPM, should be indicated by this
meter. When the bypassing increases to 10% of the maximum pump
volume, or about 4.7 GPM, the pump should be changed.

3 Pressure Filter

This pressure filter traps contaminants generated by the no. 1 and/or
no. 1A pump(s). When operating at high pressure, normal pump wear
can generate enough contamination to damage downstream
components. The element’s condition should be checked regularly
by observing the visual indicator. This filter should be checked and
changed on a scheduled basis. If not already in place, such a filter

Page 34 Troubleshooting Papermill Hydraulics