HYDRAULIC CONTROL VALVE ASSEMBLY.

TM 10-3930-623-34

2. Assemble back-up ring (12) and

preform

NOTE

packing (13) on cylinder stuffing box (10).

Complete installation of one spool

before installing second one.

3. Check insert plug (11) and insert new plug if

badly cut by cylinder threads.

2. Assemble new preform packing (27, figure 4-6)

into body recess with packing retainer (31).

4. Assemble packing set (9) in the stuffing box and

compress with packing gland (5). Assemble screws (6)

3. Assemble in order to spool lower end, spring

and lock washers (7).

seat (29) spring (30), second spring seat (29) and

retaining ring (28).

NOTE

4. Assemble cap (20) to valve body.

Packing set consists of five molded

rings which must be stacked as

5. Assemble new packing (27) to valve body upper

follows: bottom, flat side with white

spool bore.

stripe; second and fourth from top,

no color stripe; first and third from

6. Assemble packing retainer (26), wiper ring (25),

top, red stripe. Stack packing rings

retainer plate (22), control handle bracket (21) and

to nest on bottom ring. Insert ring

screws (23).

one first into stuffing box (10).

5. Press piston wiper ring (8) in packing gland.

7. Assemble regulator valve plunger seat (15),

plunger (14), poppet assembly (13), spring (12), pilot

6. Screw piston clevis end (1) on piston shaft and

seat (11), in order listed in pressure regulator bore of

assemble clamp screw (2), nut (3) and lock washer (4).

valve body.

7. Adjust tilt cylinder clevis to cylinder anchor pin

8. Assemble preform packings (6 and 8) and ring

holes center to center distance to 15-5/16 inch with

(7) to relief valve cap (5).

cylinder in fully retracted condition. Torque nut (3) to 75-

80 foot-pounds.

9. Lubricate packings with OE-10 engine oil and

assemble cap (5) to valve body. Carefully drop pilot

8. Plug ports to prevent entrance of foreign

plunger (10) and its spring (9) in cap bore.

materials.

10. Assemble adjustment s rew (4) in cap until it

meets spring (9). Assemble gaskets (2), nut (3), and

6-108. TILT CYLINDER INSTALLATION.

acorn nut (1) loosely on setscrew.

Refer to TM 10-3930-623-12.

NOTE

Pressure in hydraulic systems is

regulated by adjustment of setscrew

(4) with system filled and pump

operating. See paragraph 7-(91) for

instructions. After setting pressure,

nut (3) will be locked. Parts are

loosely installed to prevent loss.

11. Assemble plug and seal (35) to lower end of

pressure regulator bore.

12. Assemble check valve poppet (19), spring (18)

in check valve bore. Assemble preform packing (17) to

plug (16) and assemble to body.

6-109. HYDRAULIC CONTROL VALVE ASSEMBLY.

13. Plug all openings to prevent entrance of dirt until

CAUTION

valve is to be installed.

The linear valve spools are mated to

the valve body during manufacture.

14. Assemble operating handles (55 and 56, figure

Do not interchange spools between

4-2) to valve handle bracket (21, figure 4-6) with pin (57,

valve bodies. Replacement of either

figure 4-2) and cotter pin (58).

spool requires complete replacement

of the body with two mated spools.

15. Connect handle to valve spool with links (61),

1. Oil valve spools with OE-10 engine oil. Carefully

pins (59) and cotter pins (58).

slide spool into valve body from the top.

6-27