TM 5-3810-307-24-1-2
Direct Drive System Direct Drive Assembly from Lower Cylinder. (Refer to Figure K-17.)
The direct drive assembly is normally removed as an assembly in order to access the impact block in
the lower cylinder and to remove the cushion rings, cushion compression ring, cushion housing guide
ring support, and/or cushion housing guide ring.
Removal.
a.
Remove the blow count recorder from the direct drive assembly (Page K-37).
b.
Remove the two lower gibs from the direct drive assembly (Page K-39).
c.
Secure and support the entire direct drive assembly (1, Figure K-17) with a sling or
chains wrapped around the bell housing of the lower drive housing.
d.
Remove the twelve lower cylinder to direct drive assembly bolts (2) securing the direct
drive assembly (1) to the flange on the lower cylinder (3).
e.
Remove the direct drive assembly (1) as an assembly (i.e. upper drive housing and
lower drive housing still bolted together) by sliding away from the impact block. Support
the impact block and prevent from falling out of the lower cylinder. Set the direct drive
assembly upright with the guide plate side down and rest on wood blocks.
NOTE
The cushion housing guide ring and cushion housing guide ring support
should remain in the top of the cushion housing of the direct drive
assembly. IF NOT, CAREFULLY USE A PRY BAR TO SLIDE THE
CUSHION HOUSING GUIDE RING AND CUSHION HOUSING GUIDE
RING SUPPORT AWAY FROM THE FLANGE OF THE LOWER
CYLINDER AND INTO THE TOP OF THE CUSHION HOUSING
BEFORE REMOVING THE DIRECT DRIVE ASSEMBLY.
Installation.
a.
Secure and support the direct drive assembly (1, Figure K-17) using a sling or chains
wrapped around the bell housing of the lower drive housing.
b.
Slide the direct drive assembly (1) over the impact block and align with the mounting
holes on the flange of the lower cylinder (3).
Place Loctite 272 (red) on the twelve lower cylinder to direct drive assembly bolts (2).
c.
Secure the direct drive assembly (1) to the lower cylinder (3) with ten lower cylinder to
direct drive assembly bolts (2). Tighten the bolts in an even pattern to avoid binding and
torque to 500 ftlb (677 Nm).
d.
Install the two lower gibs on the direct drive assembly (Page K-39).
e.
Install the blow count recorder on the direct drive assembly (Page K-37).
K-44 Change-1
