HYDRAULIC JOYSTICK CONTROL VALVE REPAIR - continued

TM 10-3930-673-34

16-22. HYDRAULIC JOYSTICK CONTROL VALVE REPAIR (CONT)

(6)

Remove metering capsule parts (20

through 27).

(a)

Remove plug (20) and parts (21

through 27) as an assembly from

housing (8).

(b)

Remove pin (21), spring seat (22),

and spring (23) from spool (24).

(c)

Remove back-up ring (25) and

preformed packings (26 and 27)

from plug (20). Discard back-up ring

and preformed packings.

b. Cleaning. See Cleaning Instructions

(Para 2-12).

c. Inspection.

TR01770

(1)

Inspect boot (1) for tears, stretching,

or signs of deterioration.

(2)

Inspect springs (17 and 23) for signs of stretching or distortion.

(3)

Inspect plungers (13) and spools (24) for burrs, nicks, or score marks.

(4)

Inspect bores in caps (10) and plugs (20) for burrs, nicks, or score marks.

(5)

Inspect nut (2), plate (4), and ball joint (5) threads for damage.

d. Assembly.

(1)

Apply a coat of lubricating oil to all internal sliding surfaces.

NOTE

Hydraulic joystick control valve contains four plunger capsule assemblies and four

metering capsule assemblies all four plunger capsule assemblies and metering capsule

assemblies are installed the same way.

(2)

Install metering capsule parts (20 through 27) in housing (8).

(a)

Assemble spool (24) to spring seat (22) using pin (21).

(b)

Install preformed packings (26 and 27) and back-up ring (25) on plug (20).

(c)

Place spring (23) on spool (24) and insert spool (24) in top of plug (20).

(d)

Install plug (20) and parts (21 through 27) as an assembly in housing (8). Tighten plug to 29 -

41 lb-ft (39.32 - 55.59 Nm).

16-128