Assembly and Adjustment. - TM-10-3930-618-340116

(d) Stroke each surface across the

abrasive several times and check the results. Any small

bright areas indicate a burr which must be removed.

When polishing the parts, hold them as flat as possible

against the abrasive. After 6-to-10 strokes across the

abrasive, check the part to see if it is polished. After

each part is polished, rinse clean in solvent', blow dry

with air, and place it where it can remain absolutely clean

until assembly.

(4) Replace all packing and oil seals.

Replace all other parts as authorized.

g. Assembly and Adjustment.

(1) General. Refer to figures 5-2 thru 5-6

when assembling and adjusting.

(2) Control assembly.

(a) Install clean wooden block in vise to

provide platform for assembly operations.

(b) Place housing (48) on wood

Figure 5-5. Installing centering spring set.

platform and drop check valve spring (47) into check

hole with large end down.

(I) Center spring set (42), alining each

spring so the entire set is flush with upper surface of

making sure it rests on top of small end of spring (47).

control spool and sleeve.

(d) Place check valve seat (45) on

(m) Install the cross pin (41) through the

3/16inch hex wrench and screw into a check hole so

spool and sleeve and push into place until pin is flush or

machined counterbore of seat is towards ball (46).

slightly below the sleeve diameter at both ends.

(e) Lower wood platform in vise and

(n) Place the housing (48) on a solid

place housing (48) on platform control end up. Clamp

surface with the port face down. Install the spool

vise jaws lightly across housing port surface.

assembly with the splined end of the spool (50) entering

(f) Torque seat (45) to 150 inch-pounds

the 14-hole end of the housing first. Push parts gently

and test ball (46) action by pushing against it with small,

into place with a slight rotating motion.

clean pin.

CAUTION

NOTE

Use extreme care so control

Ball need not be snug against seat to

assembly (38) does not lose alinement

function properly.

when entering housing (48).

(g) Carefully install the spool (50) into

(o) Install control assembly (38) in

the sleeve (49). Be sure that spring slots of both spool

housing bore until flush with 14-hole end of housing.

and sleeve are at the same end. Rotate spool carefully

CAUTION

while sliding parts together. Test for free rotation.

Do not pull control assembly beyond

CAUTION

flush position or cross pin (41)will

Spool must rotate smoothly in sleeve

drop into housing discharge groove.

with finger tip force applied at splined

(p) Turn splined end of control

end.

assembly (38), checking for free rotation.

(h) Clamp wooden platform in jaws, set

(q) Install new packing (43) and check

control spool and sleeve on platform and aline spring

plug (44) in check plug hole. Use steady pressure on

slots of both.

plug and rock it slightly so packing feeds in smoothly

(i) Stand control spool and sleeve on

without cutting.

end and insert a flat tool through slots or both parts.

(r) Install new packing (40) and seal

(j) Position three pairs of centering

(24) on spool (50).

springs (42), or two sets of three each, on bench so

(s) Seat cap locator bushing (39), large

extended edge is down and center section is together.

outside diameter up, against spool (50) evenly.

(k) Install one end of positioned spring

h. Mounting Plate.

set (42) on flat tool. Compress extended end of spring

(1) Check mounting plate seal grooves for

set and push it into control spool and sleeve, withdrawing

cleanliness and smooth condition.

flat tool at same time. See figure 5-5.

(2) Install and smooth down new quad ring

shaft seal (24) and oil seal (16) into mounting plate (17)

seal grooves.

5-7