The pedestal is free to rotate in the boom base
clevis, and the boom is free to swing up and down in
the pedestal; for example, the assembly is a universal
joint that permits the boom to be swung from side to
side or raised and lowered. A clevis, welded to the
bottom side of the boom tube, supports the piston end
of the lift cylinder, and a clevis, welded to the right side
of the boom tube, supports the piston end of the swing
cylinder.
DUMP AND SWING ASSEMBLY
The hydraulically powered dump and swing
assembly is used to support and position the drill guide.
The assembly permits 180-degree drill guide dump and
90-degree drill guide swing.
GUIDE SWING AND EXTENSION
MOUNTING
The hydraulically powered guide extension
assembly extends the drill guide for additional coverage
or places the drill guide foot piece firmly against the
ground for additional stability.
DRILL MOUNTING
The drill mounting consists of the drill guide, drill
mounting plate, centralizer/foot piece, feed chain, feed
motor assembly, and hose reel plate.
Drill Guide
The upper end of the guide is fitted with a hydraulic
feed motor.
A combination centralizer/foot piece is
bolted to the lower end of the drill guide.
Drill Mounting Plate
The drill is mounted on a drill mounting plate that
is clamped to and travels on the drill guide with the aid
of four roller bearings.
Feed Chain
The drill guide is fitted with a heavy-duty roller
chain for the drill mounting plate. The chain passes over
a sprocket on the lower end of the guide and a drive
sprocket in the feed motor on the upper end of the guide.
The chain has two chain joints at both ends, connected
at the bottom of the mounting plate with a link joint.
Feed Motor Assembly
The hydraulically powered feed motor assembly,
which incorporates a planetary gear drive unit, is bolted
at the upper end of the drill guide. A brake valve is
installed in the hydraulic circuit just before the hydraulic
feed motor. The brake valve absorbs the shock when the
hydraulic feed motor receives a shock load and prevents
spontaneous dropping of the drill. The feed motor feeds
the drill through the feed chain and drill mounting plate
up and down the drill guide. The feed motor is capable
of exerting a maximum pull up of 4,410 pounds.
Hose Reel Plate
All the hoses for the drill are connected by way of
the hose reel to the hose holder, which is attached to the
right medium part of the drill guide.
TRAVELING
To travel the crawler-mounted rock drill over long
distances, place the drill guide in a horizontal position,
as shown in figure 14-23. When traveling in a drill
pattern, keep the drill guide in a vertical position.
Traveling with the rock drill, using the tramming
control panel (fig. 14-24), is as follows:
1. Forward: Push both tramming control levers
forward.
Figure 14-23.—Rock drill travel position.
14-18
