b.
Cleaning and Inspection.
(1)
Wash the exterior of the air motor with
cleaning solvent (Fed Spec P-D-680) and dry thoroughly.
(2)
Replace a defective air motor.
c.
installation.
(1)
Install the air motor as illustrated in figure
4-13.
(2)
Operate the rock drill (para 2-5) and check
for leaks.
Section Vlll. MAINTENANCE OF THE FEED MECHANISM AND
CENTRALIZER
4-22.
General
a.
Feed Chain. The feed chain assembly
built as part of the tower is operated by a high torque
Pistonair motor-, driven by a worm gear transmission. A
single bolt chain adjuster is provided for tightening the
feed chain.
b.
Centralizer. The centralizer is a ruggedly
built cast steel construction which locks and holds the
drill steel securely while drilling and pulling steel.
Horizontally hinged centralizer arms open and close
around the drill steel to pass couplings through the
centralizer.
4-23.
Feed Chain
a.
Removal.
(1)
Place the boom assembly in the horizontal
position.
(2)
Remove the feed chain as illustrated in
figure 4-14.
Figure 4-14. Feed chain, removal and installation.
4-25
