Ametek Chandler Engineering 8040D10, Instruction Manual, Page: 17 / 52

SECTION 3 – MAINTENANCE 3-1
Section 3 - Maintenance
The operating life of the Consistometer can be extended measurably if operating and
maintenance instructions provided in this manual are adhered to. Avoidance of down time and
parts replacement depends on the proper cleaning, lubrication, replacement of filters, and
calibration of instrumentation and controls. The following procedures will correspond with
the maintenance schedule time intervals included in this manual.
After Every Test
Pressure Cylinder
Inspect the metal O-ring on the pressure cylinder seal shaft and wipe it free of cement
particles. (The ring will seal many times if the ring and seat are kept clean.) Replace the o-
ring if any nicks, pits, or dents are present. Coat the o-ring with a thin film of molybdenum
disulfide grease before installation.
The thread of cylinder plug has been lubricated with a molybdenum disulfide grease by the
factory. If molybdenum disulfide grease is not immediately available, a mixture of white lead
and lubricating oil will be a satisfactory substitute.
Potentiometer Mechanism
The potentiometer mechanism (Pot Mech) must be cleaned after every test. Using a nylon
brush, lightly brush down the unit with a mild dish washing soap. Clean all cement sediment
from the contact springs, resistor, and exterior surfaces. Rinse the assembly thoroughly with
water. Apply a light coat of mineral oil to the resistor surface and bearings to prevent
oxidation.
Slurry Cup
1. All components of the slurry cup must be cleaned and inspected thoroughly after every
test to ensure proper operation of the consistometer.
2. Inspect the plug for any wear such as dishing or rounding out of the inner taper. Excessive
wear of the tapered seat will prevent the proper centering of the paddle shaft and result in
binding the paddle to the interior wall of the slurry cup.
3. Inspect the shaft tip for wear and ensure that the shaft is straight. Excessive wear of the
sharp tip or a bent shaft will prevent the shaft from centering in the cup base plug. Either
of these conditions will result in binding of the paddle to the interior wall of the slurry cup.
4. Replace the paddle any time damage such as bent or broken vanes exists. The paddle
weight should be recorded before the first use. Weigh the paddle after every 20 tests.
When the original weight of the paddle has dropped by 20%, replace the paddle.
Thermocouple (Slurry Cup)
Inspect the thermocouple to insure that it is straight and the threaded collar is positioned with
two threads showing on the lower side. Inspect the threaded collar and gland nut for clean and
well formed threading. Worn threading on either part presents a safety hazard to the operator.