TM 5-5420-228-24
HEU OR EARLY MODEL LOCKING CYLINDER REPAIR (Sheet 3 of 4)
CLEANING AND INSPECTION:
WARNING
Cleaning agent specified is flammable. Use only in well ventilated areas. Keep away
from flames, sparks, or heat. Do not smoke while using. Prevent contact with eyes,
mouth, and/or skin. Wear rubber gloves when performing cleaning procedures.
1.
Using dry cleaning solvent, clean all metallic parts.
2.
Using rags, dry all parts.
3.
Inspect all parts for damage or wear.
4.
Replace all unserviceable parts.
ASSEMBLY:
For Early Model: Install preformed packing assembly (A) on piston rod (B).
1.
For HEU Model: Use installation tool (B.1) to install new seal pack assembly (A) on piston rod (B).
2.
Install new retainer (C) (Early Model) spacer ring (C) (HEU Model) and new preformed packing (D) on
land ring (E).
3.
Position land ring (E) on head (F) with holes alined.
4.
Using socket, loosely install eight screws (G).
5.
Using torque wrench, tighten screws (G) 30 to 40 lb-ft (40.6 to 54.2 Nm).
6.
Install new wiper ring (H) in bushing (J).
7.
Using spanner wrench in unthreaded holes (K) of bushing (J), tighten bushing to land ring (E).
8.
Install new wiper ring (L) (Early Model) or scraper (L) (HEU Model) on piston rod (B).
9.
Position retainer plate (M) on piston rod (B) and aline holes with threaded holes of bushing (J).
Go on to Sheet 4
TA251733
