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 TM 55-1905-221-14-3
6-5.4
STEERING SYSTEM HELM UNIT (Continued)
LOCATION/ITEM
ACTION
REMARKS
ASSEMBLY (Cont)
b. Drop check valve compression
Torque check
spring (18) into the check
seat to 150 lb.
hole with large end down.
in. (17.0 Nm).
Drop check ball (17) into
check hole and insure that it
rests on top of the small end
of the spring (18) within the
hole. Place the check valve
seat (16) on 3/16 hex wrench
and screw into threads within
check hole so that machined
counterbore of the check seat
is toward the ball. Tighten
check seat. Test check ball
action by pushing ball with
small clean pin against spring
force. Ball need not be snug
against seat for proper
function.
c.
Install spool (6) within
sleeve (7) carefully so that
spring slots of both parts
will be at same end. Rotate
while sliding parts together.
Test for free rotation. Spool
should rotate smoothly in
sleeve with finger tip force
applied at splined end. Bring
spring slots of both parts in
line and stand parts on end
of bench. Insert spring
installation tool (Part No.
J600057) through spring slots
of both parts. Position 3
pairs of centering springs
(20) (or 2 sets of 3 each) on
bench so that extended edge is
down and arched center section
is together. In this position,
center one end of spring set
6-54
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