Page 6 - Troubleshooting Paper Mill Hydraulics Sample Excerpt 2

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

To verify that this accumulator is

operating properly, the side of the

shell can be felt. The bottom half or

two thirds should be hotter than the

top half. If heat is only felt at the

bottom, then this may mean that

the accumulator is overcharged. If

no heat is felt at all then the

pre-charge is too high, oil has

by-passed to the top of the piston

or all the nitrogen has leaked out. If

heat is felt all the way to the top,

then the accumulator is under

charged. Another check that can No. 5 Accumulator

be made is to install a charging rig

on the Schrader valve. The

pressure should not normally drop more than 100 – 500 PSI when the

accumulator is properly pre-charged.

Prior to working on or around the system, you should verify that all
pressure is bled out of the accumulator. When the pump is turned off,
the pressure can be bled out of the system by opening the no. 6
accumulator dump valve.

6 Accumulator Dump Valve

This valve is used to manually
dump the pressurized fluid in
the accumulator back to tank
when necessary to perform
maintenance on the system.
When the system is in normal
operation this valve should be
closed at all times.

Page 36 No. 6 Accumulator Dump Valve
Troubleshooting Papermill Hydraulics