LPLT Filter Press Instruction Manual
207128
Revision G, September 2012
25
8.3
Dead Weight Hydraulic Unit Maintenance
Always protect the stainless steel piston, especially when removing it.
Clean the fine mesh screen on the bottom of the water reservoir.
If the piston moves sluggishly during a test, remove the piston and O-ring from the
cylinder. Clean the O-ring groove in the cylinder. Examine the O-ring carefully
for torn or rough places, and, if the surface is damaged, replace it with a new O-
ring. Before replacing the O-ring and the piston, apply a light film of high-grade,
water-repellent grease.
In subfreezing weather, the water in the dead-weight assembly can be replaced by
an anti-freeze solution, such as propylene glycol and water; this does not adversely
affect the operation of the unit.
