Cleaning and Inspection.
Wash the exterior of the air motor with
cleaning solvent (Fed Spec P-D-680) and dry thoroughly.
Replace a defective air motor.
Install the air motor as illustrated in figure
Operate the rock drill (para 2-5) and check
Section Vlll. MAINTENANCE OF THE FEED MECHANISM AND
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
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
Place the boom assembly in the horizontal
Remove the feed chain as illustrated in
Figure 4-14. Feed chain, removal and installation.