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3-4
MAINTENANCE OF CONSISTOMETER
• Bronze bearing: Remove and clean all cement from the OD and ID of the bearing. Clean
all cement from the perimeter weep holes. Replace the bronze bearing if when the upper
collar has lost .030" off its original height.
• Thrust ring: Replace the ring if a groove is present on the lower side. The lower surface
should be flat with no cutting or gouging occurring from contact with the bronze bearing
collar.
• O-ring & Backup ring: Replace at every cleaning or any time the drain plug is removed.
Before the center shaft of the Magnetic Drive is reinstalled, the drain plug should be screwed
in (but not tightened) and the drive filled with clean oil. Then install the center shaft, and
pressurize the cylinder with oil (air supply pressure only) to ensure that air is not trapped in
the lower part of the drive. Oil passing by the plug will purge the air.
High Pressure Filter
Disassemble and clean as follows.
Cleaning is best achieved using an ultrasonic bath filled with a citric acid solution.
Thermocouple and Temperature Control System
API specs require that the temperature measuring system be verified for accuracy monthly. No
equipment is supplied with the unit for performing these tests. Review your API specs for
details and contact Chandler Engineering.
Three Months
Oil & Filter
The mineral oil in the reservoir should be drained and replaced when it becomes dirty. At the
same time, the oil filter element should be replaced. A drain plug is provided on the oil
reservoir, and a fill plug is located on top. Additions of mineral oil may be made by pouring
oil into the pressure cylinder. The oil level in the reservoir should be kept at 3/4 full. The
mineral oil supplied with the instrument is white technical oil (API gravity approximately 24.2,
pour point 40°C, flash 214°C, and viscosity 60 to 63 SSU at 38°C). This oil may be ordered
from the factory.
Drive Motor
API requires that the speed be checked and maintained at 150 rpm +/- 15 rpm. A motor speed
adjustment screw is located on the rear of the electrical cabinet. A tachometer for this test is
user supplied.
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