Installation of Adjustable Fittings

TM 5-2420-224-20-1

When installing a packing, always protect it from cuts or nicks. Do not install packing

directly over threads. If available, install packing over a plastic or rubber thread guard

supplied with new fittings. If no thread guard is available, protect packing by wrapping

fitting threads with heavy, smooth, lint-free paper or tape.

If a backup washer is used with the packing, it must be free of cuts, nicks, and

distortion. An unserviceable backup washer can cause packing to distort or rupture when

hydraulic pressure is applied, resulting in a leak.

Always make sure packing is not damaged, twisted, or distorted after installation.

6. Installation of Adjustable Fittings.

a. Apply coat of lubricating oil (Appendix C, Item 22) to new packing.

INCORRECT METHOD

CORRECT METHOD

CAUTION

P a c k i n g must be located in groove and not on threads to prevent damage to

packings.

b. Using suitable thread guard, install packing (1) and backup washer (2) in groove.

c. Turn lock nut (3) down until lock nut just contacts backup washer (2).

d. Install fitting (4) in boss (5) until backup washer (2) makes contact with boss.

e. Position fitting (4) in desired position by backing fitting out up to one full turn. Hold fitting

(4) in desired position and tighten lock nut (3).