Joy Mustang Heavyweight Track Drill

  DLT #: AT2614



Whether you drill rock to crush it, move it, or remove it, when you decide to select new drilling equipment there are really just two capabilities that interest you: high production capacity and availability. Whatever other qualities you expect in a track drill, these capabilities are indispensable. Your drilling equipment must have the ability to consistently put down hole at a rate that will keep you ahead of the competition. And your equipment must be able to stay on the job and work efficiently with minimum care. That's why, ever since its introduction in the mid-1960's, one heavyweight track drill has consistently offered availability and performance that surpasses all others in hole production in construction, quarrying, and open pit mining. That drill is the Mustang drill, the original Joy heavyweight track drill.

Today's Mustang track drill is still the same high performance heavyweight you've come to know over the years and more. We're sure that when you compare, you'll decide there's no comparison to the Mustang track drill, the leader in its field.


Firm Tripod Mounting

One of the important and widely copied design concepts of the Mustang track drill allows the tower lift cylinders to form the legs of a tripod to create a firm drilling platform. The widely spaced cylinder pivot points are main frame mounted for maximum rigidity. The exclusive Joy tripod mounting utilizes a hydraulically operated 5 foot feed extension to sting the tower to the ground, causing machine weight to transfer to the rear drive sprockets for solid three-point ground contact. The tower lift cylinders - which are an extension of the tripod - are independently extendable and provide lateral adjustment to compensate for pitching ground, thus keeping the tower in vertical alignment. The unique tripod mounting concept eliminates the need for leveling jacks still used on some heavyweight rigs.

Efficient Chain Feed

The chain feed assembly built as part of the tower operates through a heavyduty, 1-1/2 pitch, high fatigue roller chain powered by a 20 horsepower, high torque Pistonair motor driving a positive-acting worm gear transmission. The fully enclosed, grease lubricated transmission provides variable, constant feed rate for sustained penetration and 9100 pounds chain pull for quick retraction of multiple lengths of drill steel. A simple single bolt chain adjuster is provided for tightening the feed chain.


The heavyweight Mustang track drill is designed and built to move easily over rough terrain and set up quickly for drilling. This heavyweight has the ability, agility, and power to tram, maneuver, and set up quickly for deep hole, high production drilling in difficult and seemingly inaccessible locations. Much of its ability comes from a heavyweight chassis designed to perform like a mediumweight.


Heavy Duty Chassis Construction

Crawler side frames have 10 inch wide crawler pads that provide over 2100 square inches of solid ground contact for outstanding traction and sure-footedness in rough terrain. Added balance and stability comes from a 9-foot wide stance and low profile, low center of gravit main frame. Furthermore, the chassis is all working weight - no counterweights are required. The hefty ground-hugging chassis provides a stable platform for vertical or inclined drilling in uphill, downhill, or sidehill positions.

Durable Track Construction

Track frames are built to withstand hard usage and provide firm footing and stability needed for deep hole drilling. Heavy steel plate rockguards are standard, extending the full length of the side frame to provide strength and rigidity and to prevent rocks from jamming the tracks. Eight bottom idler rollers and one midpoint roller located topside give sure footing to each track and distribute the load evenly. Hardened track rollers, heat treated roller shafts and idlers are of solid alloy steel construction, with field replaceable bronze bearings. Thrust washers have grease seals to retain lubricant and keep out dirt and mud. Rear drive sprockets and front idlers are heavy, solid cast steel construction for strength and added working weight. Drive sprocket pillow blocks are reinforced cast steel and use bolt-on construction for convenient disassembly if necessary.

Track Adjustment

A unique track take-up device consisting of a single acting cylinder and compression spring is built into each side frame. The cylinder is grease pressurized to compress the spring and keep the tracks tight to help prevent tracks from jumping sprockets even in the toughest operating conditions. A grease gun is all that is needed to keep tracks properly tensioned, encouraging drillers to make the simple adjustment when needed. (Compare this to mechanical devices that require tools and frequent adjustment.) A cover over the grease fitting precludes accidental pressurizing by lubrication crews.

Independent Track Oscillation

An equalizer bar attatched transversely between the side frames allows the tracks to adjust independently to uneven terrain. The oscillation device is purely mechanical. There are no hydraulic hoses or connections to leak or break, no cylinder packings to replace, no trapped air to bleed. No adjustments are ever required and maintenance consists only of an occasional greasing.

Dependable Tramming Power, Safe Breaks

A pair of powerufl 14 horsepower, independently controlled Pistonair air motors provides tractor-type steering and tramming. The Joy-built high torque, radial air motors deliver more than ample power for moving quickly from hole to hole, climbing steep sidehills, or towing a big portable compressor. Oversized spring-loaded, air-released, band-type brakes stop the track drill automatically whenever the tram controls are released. Transmission gearing can easily be declutched for towing by means of a convenient hand lever mounted on top of each transmission.

And, unling some track drills with external brakes and exposed drive chains that are vulnerable to damage from weather and construction debris, brakes and transmission gearing on Mustang drills are oil sump lubricated and totally enclosed within an oil-tight case, to protect against rock dust and weather.

Centralizer

A massive, ruggedly built cast steel centralizer locks and hold the drill steel securely while collaring the hole. The centralizer has an additional function as part of the Steel Wrenching System: slotted centralizer bushings to engage the flatted couplings to hold the steels while uncoupling. When pulling steels, horizontally hinged centralizer arms automatically open and close around the drill steel as a the couplings pass through the centralizer.


Drilling Controls

Operating controls for the drill hammer, chain feed, and steel handling system are conveniently mounted on the left side of the tower, arranged in a logical manner for systematic one-man operation and close-in observation of drilling. An automatic feed pressure regulator is adjustable to maintain optimum penetration according to the formation being drilled; a unique device that provides a tolerance without sacrificing drilling performance.

Rotation

The rotation control valve includes a metered, slow rotation position for drilling in addition to a fast rotation position for overburden drilling and retracting. Rotation speed (rpm) can be fixed for repeatable, consistent hole-to-hole performance or it can easily be reset to accommodate changing drilling conditions. A feathered reverse rotation function provides for easy uncoupling of steels.

Feed

The feed control valve includes a regulated forward feed position for drilling in addition to a fast speed function for hole cleaning and steel handling. Feed control valve settings are adjustable and repeatable. This assures optimum hole-to-hole performance. The feed valve can readily be reset when drilling conditions change. A feathered fast retract contols affords easy uncoupling and fast steel handling.

It is important to note that feed and rotation control valves are each designed with four positive stops for precise control in neutral, controlled forward, full forward, and full reverse.

Tramming and Tower Controls

Controls for tramming and tower positioning are located on a single pedestal side-mounted over the tracks and function-oriented for easy operation. Tram controls for tractor-type maneuvering overhang the tracks so the operator can avoid walking close to the crawlers. All controls are spring-loaded "off" for safety and tram controls fold down to prevent accidental operation. Individual control levers operate each tower lift cylinder independently for raising and lowering of the tower from 12° above horizontal to 15° ahead of vertical plus lateral movement 10° each side of vertical to compensate for terrain variations. A third control lever operates the 5 foot feed extension cylinder to sting the tower to the ground and provide tripod stability for drilling.


Simple, Effective Hydraulic System

The Mustang track drill uses a simple closed circuit hydraulic system that opeartes only when hydraulic power is needed. No air pressure is wasted on running an idle system. A pressure-regulated, vane-type air motor powers a high capacity pump to supply hydraulic pressure as required for operating the tower lift cylinders, feed extension cylinder, and the cylinders that operate the steel handling system. The hydraulic system requires practically no attention other than occasional checking of the oil level in the reservoir, which is integral with the chassis main frame.

Hydraulic Safety

All hydraulic cylinders are double-acting and self-locking when not in operation. Additional protection is provided by pilot check valves that prevent cylinder movement, except when intended or in the event of line breakage. A pressure regulating valve limits pump motor air pressure for optimum system hydraulic pressure.

Exclusive Pressurized Air-Oil Lubrication System

Positive air stream lubrication of the drill engine, all air valves and air motors is accomplished with a unique lubricator fitting integral with the main air inlet. The lubricator, or injection oiler, directs a pressurized and filtered air-oil mixture to operating components.

Oil flow is adjustable for effective, positive lubrication without wasting oil. Oil is consumed only when components of the system are operating. The drill engine oil reservoir is built into the chassis main frame. This compact, integral design eliminates add-on tanks found on some track drills and contributes to the overall clean lines of the Mustang track drill.

Lubricator Fitting

The self-cleaning lubricator fitting keeps dirt out of the system to insure against machine breakdown. As shown in the illustration, inlet air passes through a fine wire mesh screen so that clean air only is delivered to operating components. When blow air to the drill is used, air rushes through the core of the strainer and any accumulation of dirt, pipe scale or flakes for hose lining is immediately blown out via the drill air tube. An optional shut off valve is available close coupled to the lubricator fitting.