Figure 5-1. Adding Damping Oil to Balancing Arbor.

TM 55-4920-201-14

Figure 5-1. Adding Damping Oil to Balancing Arbor.

To fill arbor, remove both oil hole screws, using

b. Balancing arbor. part no. 2516 (7HEL053

1/16-inch

hex

wrench

(7HEL053

kit).

Using

kit). Use light mineral oil only in dash-pot of this

positive-pressure, pump-action oil can, pump oil

arbor. Do not use other than light mineral oil in this

into lower arbor oil hole until oil appears at level of

arbor assembly. One oil hole is located in aide of

upper arbor oil hole. Reinstall lower and upper

arbor

approximately

1-11/16-inches

below

in-

filler hole screws. If positive-pressure-type can is

dicator bushing; another is located in opposite side

not available, arbor dash-pot may be filled through

approximately 2- inches from lower end of arbor.

5-4