Ditch Witch JT60AT - Manual (Page 132)

Systems and Equipment - 132
JT60/JT60 All Terrain Operator’s Manual
Drilling Fluid
Funnel Viscosity
Viscosity is the measure of internal resistance of a fluid to flow; the greater the resistance, the higher the
viscosity. Viscosity of drilling fluids must be controlled.
To determine viscosity, you will need a Marsh funnel (p/n 259-267) and a measuring cup, available from
your Ditch Witch dealer.
1. Using wash hose and a clean container, take
a fresh sample of drilling fluid. The sample
must be at least 1.5 qt (1.4 L).
2. With finger over bottom of funnel, fill with fluid
from the container through the screen until
fluid reaches the bottom of the screen.
3. Move funnel over 1 qt (.95 L) container.
4. Remove finger from bottom of funnel and use
the stopwatch to count the number of
seconds it takes for 1 qt (.95 L) of fluid to
pass through the funnel. The number of
seconds is the viscosity.
5. Thoroughly rinse measuring cup and Marsh
funnel.
IMPORTANT: Make sure Marsh funnel is clean and free of obstruction and that you have a stopwatch
available for timing the viscosity.