TM 5-3810-307-24-1-2
Inspection.
a.
Inspect the cushion housing guide ring (2, Figure K-19) for scoring, wear, or other
damage.
Installation.
a.
Slide the cushion housing guide ring (2, Figure K-19) into the cushion housing guide ring
support (1).
b.
With the direct drive assembly standing upright, install the cushion housing guide ring
support (1) and cushion housing guide ring (2) into the cushion housing of the direct
drive assembly. Use a soft-face hammer or a wood block to help tap into place.
c.
Install the direct drive assembly onto the lower cylinder (Page K-44).
Impact Block. (Refer to Figure K-20.)
The impact block is normally removed to inspect and to remove and inspect the impact block
compression rings.
Removal.
a.
Remove the direct drive assembly as an assembly from the lower cylinder and set aside
b.
Position a lifting device and sling approximately five inches (13 cm) behind the head of
the impact block (1, Figure K-20).
CAUTION
Place a piece of plywood (or other protective material) on the floor
beneath the impact block to prevent damage in the event any
components fall to the floor during lifting of the impact block.
c.
Raise the lifting device and sling slightly to carry the weight of the impact block (1).
WARNING
Remain clear when removing the impact block from the lower cylinder in
the event the impact block falls from the sling.
d.
Pull the impact block (1) clear of the lower cylinder (2).
e.
Place the impact block (1) on a wood block with the compression ring (3) grooves down.
Inspection.
a.
Inspect the impact block (1, Figure K-20) for pitting, mushrooming, or cracks.
b.
Inspect the impact block (1) for evidence of exhaust smoke (blow-by) escaping as
indicated by an area of black carbon on the impact block (as opposed to a shiny, well-
lubricated impact block). This would indicate defective impact block compression rings
(3).