Table 4-1. Organizational Preventive Maintenance Checks and Services for Crawler-mounted Rock Drill
Not Fully Mission
Air Hose Connections
Check all air hose connections and
tighten if necessary.
Check track suspension for proper
adjustment. Track should sag approx.-
mately 1 in. at a point midway between
the two sprockets. Adjust if needed (see
Slide Bar Shims
Measure clearance between slide bar
and feedshell channel. If clearance is
greater that 1/8 in., remove slide bar and
adjust shims until clearance is less than
1/8 in. (see paragraph 5-12). Repeat for
all four slide bars.
Close centralizer and measure inside d i-
ameter of bore. Replace centralizer
blocks when inside diameter is greater
than 2 in.
Check torque on side rod mounting
nuts. Gradually tighten to 150 lb-ft.
Boom Drill Carriage
Inspect feed chain for proper tension.
Adjust if necessary (see paragraph 4-23
Drifter Drill Cradle
Inspect wear plates and shims for appar-
ent wear. Replace if needed.
Inspect hydraulic hoses for leaks or ot h-
er damage. Replace defective hoses.
Inspect centralizer bushings for appar-
ent wear (not applicable to units
equipped with retrofit kit). Replace if