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 TM 55-1905-217-34
(12) Remove centering pin (15, fig. 4-27) from spool sleeve assembly. Push inside lower edge of spool (16) so
that spool moves toward splined end and remove carefully from sleeve. Push centering spring set (14) out of spring slot
in spool.
c. Cleaning, Inspection, and Repair.
(1) Clean all parts with solvent, (FED. SPEC. PD-680). Set parts on a clean paper towel to dry.
(2) Disassemble meter gear set (4, fig. 4-27) and clean with solvent.
(3) Inspect all moving surfaces to insure that they have not been scored or abraded by dirt particles or otherwise
disrupted. Smooth burnished surfaces are normal in many areas. Slightly scored parts can be cleaned with 600 grit
abrasive paper by hand rubbing only.
(4) 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 (4, fig. 4-27) can be used for
this purpose if necessary. Then both sides of the ring gear (4), both sides of the plate (3), the 14 hole end of the housing
(7) and the flat side of the end cap (5) 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 the abrasive is as flat as possible. (Do not push one edge down hard or the flatness will become rounded).
Check each part after 6 to 10 strokes across the abrasive. After polishing each part, rinse clean in solvent and blow dry.
Keep these parts absolutely clean until they are assembled.
d. Reassembly.
(1) Place clean wooden block across vise throat and place housing in vise with control end up. Clamp across port
surface lightly.
(2) Drop check valve spring (12, fig. 4-27) into the check hole with large end down. Drop check ball (11) into
check hole and insure that it rests on top of the small end of the spring within the hole. Place the check valve seat (10)
on hex wrench and screw into threads within check hole so that machined counterbore of the check seat is toward the
ball. Tighten check seat to 150 inch- pounds torque. Test check ball action by pushing ball with small clean pin against
spring force. Ball need not be snug against seat for proper function.
(3) Install spool (16) within sleeve (13) 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
through spring slots of both parts. Tool is available as Part No. 60057. Position 3 pairs of centering springs (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 into spring installation tool. Compress extended end of centering spring set and push into spool sleeve
assembly withdrawing installation tool at the same time. Center the spring set in the parts so that they push down evenly
and flush with the upper surface of the spool and sleeve. Install centering pin (15) through spool assembly. Push into
place until centering pin is flush or slightly below the sleeve diameter at both ends.
(4) Position the housing on a solid surface with the port face down. Start the spool assembly so that the splined
end of the spool enters the 14 hole end of the housing first. Be extremely careful that the parts do not cock out of
position while entering. Push parts gently into place with slight rotating motion. Bring the spool assembly entirely within
the housing bore until the parts are flush at the meter end or 14 hole end of the housing. Do not pull the spool assembly
beyond this point (to prevent the cross pin from dropping into the discharge groove of the housing). With the spool
assembly in this flush position, check for free rotation within the housing by turning with light finger force at the splined
end. Hold the parts in this flush position and rest the 14 hold end of the assembly on the protective block on the vise
throat and clamp lightly across the port face with the vise.
(5) Install a new seal (8) on the plug (9). Install the plug in the check hole with a steady pressure while rocking is
slightly so the seal (8) feed in smoothly without cutting.
(6) Position the cap locator bushing (19) with large O.D. chamfer UP partly into end of housing. Insure that it
seats against spool assembly flat and smooth by rotating with finger tips.
(7) Check the mounting plate (21) and shaft seal (20) carefully to insure that they are clean and in good condition.
Insure that the mounting plate seal grooves are clean and smooth. Each of these seals is slightly larger than its seal
groove so that they will be adequately retained in service. Push each gently into place and smooth down into seal
groove with finger tip. Thin oil seal (22) at exterior of mounting plate is a dirt exclusion seal
4-47
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