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 TM 55-1905-221-14-3
6-5.4
STEERING SYSTEM HELM UNIT (Continued)
LOCATION/ITEM
ACTION
REMARKS
OVERHAUL
10. Helm Unit
NOTE
Use seal kit 5140.
a. Replace seals.
b. Replace check seat steel ball.
c.
Replace springs.
d. Replace packings.
e. To prepare all surfaces of the
meter section for reassembly
and insure that all edges of
the parts are burr free, place
a piece of 600 grit abrasive
paper face up on an extremely
flat, clean, hard surface.
The surface to be used for
this purpose should be as
flat as plate glass or better.
If the 600 grit paper is new
it should first be rubbed
down with a scrap steel part
to remove sharp grit which
would produce scratches. The
ends of the star gear can be
used for this purpose if
necessary. Then both sides
of the ring gear, both sides
of the plate, the 14 hole end
of the housing, and the flat
side of the end cap should be
cleaned lightly. Stroke each
surface across the abrasive
several times and observe the
part. Any small bright area
near an edge indicates a burr
which must be removed. Hold
the part so that contact with
6-52
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