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 TM 55-1905-222-14
6-14
REPAIR HELM UNIT (Continued).
3.
INSPECT METERING SECTION.
a.
Inspect end cap for cracks or other damage.
b.
Inspect set and plate (30) for burrs, nicks or
other damage. Remove minor defects or
replace entire part as necessary.
c.
Inspect spacer (28) and drive shaft (31) for
cracks, burrs, wear or other damage.
Repair/replace as necessary.
ASSEMBLY
1.
ASSEMBLE CONTROL SECTION.
a.
Position housing (16) in a vise with control end
up.
b.
Install check valve compression spring (25)
with large end down. Drop steel ball (24) into
the check valve hole and ensure that it rests on
top of the small end of the compression spring
(25).
c.
Install check valve seat (23) using a 3/16 hex
wrench. Tighten check valve seat. Test check
ball action by pushing ball with a small clean pin
against spring force. Ball need not be snug
against seat for proper functioning.
d.
Install new packing (22) and seal plug (21)
using a steady pressure.
e.
Install control spool (17) in control sleeve (18)
carefully, so that spring slots of both parts are
on the same end. Rotate while sliding parts
together. Spool should rotate freely in sleeve.
6-77
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