(5) After the sample bottle is filled to the required level, close the drain. Allow any excess
or overflow to drain into the 'catch can'. (See appendix C, figure 6C)
(6) Replace and tighten cap on sample bottle.
(7) Replenish the quantity of oil drained from the component with clean new oil, if
necessary.
(8) Complete the Oil Analysis Request form in accordance with the instructions in Section
(9) Wrap it around the oil sample bottle. Secure with a rubber band and send sample to the
laboratory the same day as the sample is taken.
7-3. Special Sampling.
a. Hydraulic Systems. If an oil-sampling valve is not installed, one of following three
locations may be used to sample hydraulic systems. They are listed in order of preference.
(1) Use the tube method to sample the reservoir, provided the reservoir is part of the
circulating system.
(2) Use the drain method to drain the oil sample from the filter housing.
(3) Draw the sample from a line that circulates fluid. Be careful while disconnecting the
line in order to avoid contamination of the fluid.
b. Transmissions and Gearboxes. These can be sampled using the tubing method with the
following variations:
(1) Remove the magnetic plug and insert one end of the tubing into a clean sample bottle.
(2) Displace the check valve with the other end of the tube and draw off enough oil
through the tube to fill the bottle.
c. Swashplate Assembly.
(1) Disconnect the scissors and sleeve drive links from the swashplate outer ring assembly.
Lift the drive link out of the way and secure it.
(2) Using a soft, clean, lint-free cloth dampened with cleaning solvent, clean the inner and
outer ring assembly at the upper shield. Ensure all surface grit, sand, and other foreign materials
are removed. This will ensure an uncontaminated grease sample.
(3) Using a grease gun with a flexible hose to purge and lubricate the swashplate at
approximately 30-degree intervals until the assembly has rotated one full turn (360 degrees) to
7-5
