TM 5-5420-228-24
HEU OR EARLY MODEL OVERHEAD CYLINDER REPAIR (Sheet 4 of 6)
1. Using dry cleaning solvent, clean all metallic parts.
2. Using rags, dry all parts.
3. Inspect all parts for damage or wear. Replace all unserviceable parts.
ASSEMBLY:
For HEU: Position packing installation tool (A) on piston rod (B). Install new seal pack assembly (B.1) on
1.
piston rod (B) and push it into overhead cylinder (C). Remove packing installation tool (A).
For Early Model: Install new preformed packing assembly (B.1) on piston rod (B) and push it into overhead
cylinder (C).
2.
Install new spacer ring (D) (Early model) or retainer (D) (HEU) and new preformed packing (E) on land ring (F).
3.
Position land ring (F) on piston rod (B) and aline holes with overhead cylinder (C).
4.
Manually install eight screws (G) into land ring (F) and overhead cylinder (C).
5.
Using 1-5/16 inch socket and torque wrench, alternately tighten eight screws (G) to 320-330 lb-ft (440-445 Nm).
6.
Manually install new wiper ring (H) in land ring (F).
7.
Manually install four 10/32 screws (J) in threaded holes (K) of bushing (L).
8.
Using spanner wrench on screws (J), tighten bushing (L) against land rings (F).
9.
Manually remove screws (J) from bushing (L).
TA251722
Go on to Sheet 5
Change 3
3-230.5
