Water Quality; Care And Maintenance - Hardinge Talent 6/45 Maintenance Manual

pH
pH is a measure of a solution's alkalinity or acidity. There are two common methods used to
determine pH. One method is the use of special pH test paper and the other is a pH meter.
Water based coolants are designed to run within the pH range determined by the manufacturer.
The pH of water based coolants typically runs on the alkaline side of the pH scale. A drop in pH
indicates a growth of microbiological organisms. Typically, the pH range is between 8.5 and 9.2.

WATER QUALITY

The water quality is also an important factor toward achieving optimum coolant performance.
Water that contains dissolved minerals, bacteria, and other impurities can sometimes adversely
affect the coolant selected. An indication of water related problems is the formation of a soap like
scum which adheres to sumps, filters, and other surfaces. It is best to consult with your coolant
representative to determine your requirements.

CARE AND MAINTENANCE

A daily check of the concentration and pH will help keep the coolant at its optimum performance
level.
Make-up coolant should be added when needed and according to the manufacturer's
recommendation. This make-up coolant is necessary to provide additional fresh coolant which
contains the essential additives required to keep the coolant performing properly.
Clean and replace the coolant per the coolant manufacturers recommendations. Proper cleaning
of the machine is very important before refilling the tank with fresh coolant. Dispose of the used
coolant properly.
Bacteria live and cling to all wetted surfaces in the machine. Special cleaners, usually available
from your coolant supplier, are recommended to flush the system before refilling. These cleaners will
kill the bacteria left after draining the machine.
It also is recommended that a thorough cleaning, which includes scraping and removing any
sludge found on the bottom and hidden in the top panels of the coolant tank, be completed before
circulating cleaner through the system.
M-448B 4-3