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KEY FEATURES DETAILS LITERATURE MANUAL
- PR75 can fracture or cut any type of existing pipe—water, sewer, or utility—and pull in new pipe with 75 tons of pullback force.
- The static PR75 has the power to fracture and replace not only clay and PVC but also pipe made of steel, ductile iron, and cast iron—all with minimal disturbance to the surrounding infrastructure.
DETAILS, PR75
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- The PR75's tremendous pullback force enables it to pull in pipe that is larger than the original, effectively increasing the infrastructure's capacity.
- Optional automatic rod device enables faster make-up times, for less operator fatigue and faster replacement of pipe.
- Optional extension frame provides exceptional setup flexibility and access to more jobsites.
- Compact size enables greater jobsite accessibility.
- Engineered with heavy-duty components designed to provide longer life, less wear, and less maintenance; reinforced steel shrouds protect each unit's cylinders from damage and debris.
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- Designed with a minimal number of moving parts and wear items, for easier operation, less maintenance, and greater productivity.
- Direction of the bore can be changed with the touch of a button.
- Comprehensive set of tools and accessories, everything from wrenches to grease, comes standard.
- Load-sensing hydraulics automatically shift the unit to high speed when there's no load, and downshift the unit when a load is introduced.
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SPECIFICATIONS, PR75
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PULLING UNIT
Pullback force
Length
Width
Height
Weight
Rod diameter
Rod weight
Rod length
ROD MAKE-UP DEVICE
Length
Width
Height
Weight
POWER PACK
Length
Width
Height
Weight
POWER
Engine: Kubota D1105E
Fuel: Diesel
Cooling medium: Liquid
Injection: Indirect
Aspiration: Natural
Number of cylinders: 3
Displacement
Bore
Stroke
Manufacturer's gross power rating (per SAE J1995)
Estimated net power rating (per SAE J1349)
Rated speed: 3000 rpm
HYDRAULIC SYSTEM
Main pump
Flow, max.
Pressure, max.
FLUID CAPACITIES
Fuel tank
Hydraulic reservoir
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U.S.
143,300 lb
102 in
15.7 in
31.5 in
3090 lb
1.97 in
33 lb
39.4 in
U.S.
23.6 in
15.7 in
19.7 in
408 lb
U.S.
59 in
38.6 in
37.4 in
1210 lb
U.S.
68.6 in3
3.07 in
3.09 in
26 hp
25 hp
U.S.
7.4 gpm
3600 psi
U.S.
5.3 gal
37 gal
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METRIC
637 kN
2.6 m
400 mm
800 mm
1400 kg
50 mm
15 kg
1 m
METRIC
600 mm
400 mm
500 mm
185 kg
METRIC
1.5 m
980 mm
950 mm
550 kg
METRIC
1.1 L
78 mm
78.5 mm
18.6 kW
19.4 kW
METRIC
25 L/min
250 bar
METRIC
20 L
140 L
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Specifications are general and subject to change without notice. If exact measurements are required, equipment should be weighed and measured. Due to selected options, delivered equipment may not necessarily match that shown. Contains patented features. |
Jobsite safety cannot be overemphasized. You're working on and around heavy equipment that you need to understand and respect. Below is a "Safety Matters" topic relevant to this Ditch Witch product. For other "Safety Matters" topics, plus safety videos and other important facts about jobsite safety, please visit our Ditch Witch Safe page.
Locating safety. Remember that you can verify locates with Ditch Witch electronic pipe and cable locators, and a sure way to verify the location of buried utilities is to expose the lines with a Ditch Witch vacuum excavator.
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 Safety Matters is intended to promote discussions of safety issues among underground construction professionals. |
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JOB RELATED, PR75
Stay Cool And Stay Alive
If you work outdoors, summer is one of your busiest times of the year because it’s typically the driest season and offers the most hours of daylight. But the sun providing all that productive daylight can be the biggest jobsite hazard you face all year. Excessive heat can bring down anyone who doesn’t take the necessary precautions.Keeping Your Fleet's Hydraulic Systems Running ProperlyIf your machine's hydraulic system isn't working, neither are you. Here are some common causes of hydraulic system breakdown and steps you can take to avoid them. New Trenchless Device Bursts Onto The SceneYour next rehab job doesn't have to tie up a crew of ten, cut off utility service to 2000 customers, or reroute 5:00 traffic. With the new line of Ditch Witch pipe bursting systems, upgrading water and sewer infrastructure is cleaner, less disruptive, and more affordable than ever.
stopimg title="keepCool_img1" style="padding-right: 20px;" align="left" style="BORDER-BOTTOM: 0px solid; BORDER-LEFT: 0px solid; WIDTH: 260px; PADDING-RIGHT: 10px; HEIGHT: 195px; BORDER-TOP: 0px solid; align: left" alt="keepCool_img1" src="/uploadedImages/Left_Nav/Press_Room/Job_Related_List/1_KeepCool_260x195(1).jpg" border="0" />Catastrophic tornadoes and floods have grabbed recent headlines, but each year one weather phenomenon kills more people than tornadoes, floods, hurricanes, and lightning combined: heat.
According to the National Oceanic and Atmospheric Administration (NOAA), an average of more than 1,500 people in the U.S. die each year from excessive heat—yet it is the most preventable of weather-related deaths.
If you work in construction, summer is one of your busiest times of the year because it’s typically the driest season and offers the most hours of daylight. But the sun providing all that productive daylight can be the biggest jobsite hazard you face all year. No matter how tough you are or how used to the heat you think you are, excessive heat can bring down anyone who doesn’t take the necessary precautions.
The following information applies to anyone who is employed in an outdoor profession—construction workers in particular—but also applies to those who work in hot factories and anyone who spends time outdoors exercising, gardening, or laboring in any capacity during the summer months. (This is general information. More specific information can be found in the sources cited below.)
Know Your Chemistry
Our bodies dissipate heat by varying the rate and depth of blood circulation, and by expelling water through the skin and sweat glands. When we reach the danger zone, when our blood is heated above 98.6 degrees, we begin to pant—we’re literally “working like a dog.”
Sweating alone does little to cool the body, unless the sweat is removed by evaporation. But high relative humidity inhibits evaporation. When you’re checking the forecast for tomorrow, pay close attention to the heat index: the combination of relative humidity and air temperature. For example, if the air temperature is 96° F and the relative humidity is 65 percent, the heat index is 121° F. This is the heat your body really feels.
Heat disorders involve a reduction or collapse of our bodies’ ability to shed heat by circulatory changes and sweating, or a chemical (salt) imbalance caused by too much sweating. When heat gain exceeds the level the body can remove, or when the body cannot compensate for fluids and salt lost through perspiration, the temperature of the body's inner core begins to rise, bringing on various degrees of heat-related illnesses.
stopimg title="keepCool_img2" style="padding-left: 20px;" align="right" style="BORDER-BOTTOM: 0px solid; BORDER-LEFT: 0px solid; WIDTH: 260px; PADDING-RIGHT: 10px; HEIGHT: 195px; BORDER-TOP: 0px solid; align: right" alt="keepCool_img2" src="/uploadedImages/Left_Nav/Press_Room/Job_Related_List/2_KeepCool_260x195.jpg" border="0" />Ranking Heat Disorders
The severity of heat disorders is relative to a person’s age, weight, fitness, medical condition, and degree of acclimatization to the heat. For example, heat cramps in a 17-year-old may translate as heat exhaustion in someone who is 40, and heat stroke in a person over 60. Common heat disorders include:
- Sunburn. Along with being painful and irritating, sunburn can significantly retard the skin’s ability to shed excess heat. The best solution for sunburn is prevention, by applying sunscreen throughout the day.
- Heat cramps. Symptoms are painful spasms, usually in the muscles of the legs and abdomen, often preceded by profuse sweating.
- Heat rash. Also known as prickly heat, heat rash can occur in hot, humid environments where sweat is not easily removed from the surface of the skin by evaporation. Serious heat rash can be so uncomfortable that it inhibits sleep and impedes a worker’s performance.
- Heat exhaustion. Symptoms include heavy sweating, weakness, headache, fainting, vomiting, and skin that is cold, pale and clammy. It is possible to have a normal temperature with heat exhaustion.
- Heat stroke or sunstroke. This is the most serious health problem for workers in hot environments. Heat stroke occurs when sweating stops and the body can no longer rid itself of excess heat. Symptoms include an excessively high body temperature (106° F or higher); mental confusion or delirium; convulsions; hot, dry skin; strong and rapid pulse; and possible unconsciousness. Make no mistake: heat stroke can be fatal, and victims need immediate medical attention.
Prevention: The Best Solution
The number one method of avoiding heat disorders: avoiding heat. But for construction workers in the summer, this is simply not possible. So, here are some tips for staying cool and staying alive, beginning with the most obvious:
- Drink plenty of fluids. Your body needs water to keep cool. Drink water even if you don't feel thirsty. Proper hydration actually begins the day before a long, strenuous day in the sun. Before increasing your fluid consumption, consult a physician if you (1) have epilepsy or heart, kidney, or liver disease; (2) are on a fluid-restrictive diet; or (3) have a problem with fluid retention.
- Do not drink alcoholic beverages. Alcohol dehydrates your body. Enough said.
- Limit caffeine intake.
- Do not take salt tablets unless specified by a physician.
- Put less fuel on your inner fires. Foods that are heavy in protein increase metabolic heat production and also increase water loss.
- Dress as lightly as possible. You need protective clothing, of course, but consider light-colored fabrics, such as cotton, that breathe.
- When possible, take longer breaks than normal in a cool, shaded area. A rested worker is a more productive worker.
- Know the symptoms of heat illnesses. Use a buddy system to keep tabs on your fellow workers.
- Acclimate yourself to the heat. You can “get used to” the heat, to some degree. Workers, especially those who follow the advice above, can eventually develop some degree of tolerance. However, new employees and workers returning from an absence of two weeks or more should have a five-day period of acclimatization: 50 percent of the normal workload and time exposure the first day, gradually building up to 100 percent on the fifth day.
stopimg title="keepCool_img3" style="padding-left: 20px;" align="right" style="BORDER-BOTTOM: 0px solid; BORDER-LEFT: 0px solid; WIDTH: 260px; PADDING-LEFT: 10px; HEIGHT: 195px; BORDER-TOP: 0px solid; align: left" alt="keepCool_img3" src="/uploadedImages/Left_Nav/Press_Room/Job_Related_List/3_KeepCool_260x195.jpg" border="0" />Supervisor Obligations
There are precautions every employer should take when temperatures are high and the job involves physical work.
- Understand the signs of heat stress and permit workers to interrupt their work if they are extremely uncomfortable.
- Provide training about the hazards leading to heat stress and how to prevent them.
- If possible, schedule the heaviest workload for the coolest part of the day: early morning or late evening, when the sun is less intense.
- Make sure your workers have easy access to cool water—a minimum of one quart of water per hour, per worker.
- Schedule frequent rest periods with water breaks in shaded or air- conditioned areas.
- Routinely check on workers who are at risk of heat stress due to protective clothing and high temperature. Pay close attention to those who are at risk because of age and physical condition (including obesity and diabetes).
When A Fellow Worker Is Ill From The Heat
- Call a supervisor for help. If the supervisor is not available, call 911.
- Have someone stay with the worker until help arrives.
- Move the worker to a cooler/shaded area.
- Remove outer clothing.
- Fan and mist the worker with water; apply ice (ice bags or ice towels).
- Provide cool drinking water, if the worker is able to drink.
For more information about preventing and treating heat-related illness, consult these articles:
Sources for this article:
- National Oceanic and Atmospheric Association (noaawatch.gov)
- Occupational and Safety Health Administration (osha.gov)
If your machine's hydraulic system isn't working, neither are you. Here are some common causes of hydraulic system breakdown and steps you can take to avoid them.
stopimg title="SK650_1" style="padding-right: 20px;" align="left" alt="SK650_1" src="/uploadedImages/Left_Nav/Press_Room/Job_Related_List/SK650_1stopimg4Contamination
An estimated 75 percent of all hydraulic system failure is due to contamination, so change filters regularly. If filters become dirty too frequently, examine them. Metal shavings can indicate that a pump, motor, or other upstream component may be failing. Resin or sludge—type material usually means oxidation of the fluid, often caused by low fluid levels or damaged seals.
Use clean tools and equipment, and always thoroughly clean hydraulic components before you remove, repair, or reinstall them. When you disconnect a hydraulic line, cap the end to keep contamination out while you're servicing the system. When you put the system back together, always install a new filter.
stopimg title="SK650_2" style="padding-left: 20px;" align="right" alt="SK650_2" src="/uploadedImages/Left_Nav/Press_Room/Job_Related_List/SK650_2stopimg4Low or Dirty Fluid
Low fluid levels can cause everything from sluggish cylinder operation to catastrophic pump cavitation, so check the fluid regularly (with the engine off and the fluid cool) and maintain the proper level. Always use the right fuel for your system.
Murky or cloudy fluid usually indicates water or air in the system. Water can come from condensation, and excess air can be a result of low fluid levels, a damaged seal, or a crack in a suction hose.
Other System Components
Sometimes the obvious causes of hydraulic system trouble get overlooked. Try these preliminary checks:stopimg title="SK650_3" style="padding-right: 20px;" align="left" alt="SK650_3" src="/uploadedImages/Left_Nav/Press_Room/Job_Related_List/SK650_3stopimg4
- Check the hydraulic fluid level with the engine off and the fluid cool.
- With the engine stopped, check for leaks around seals, castings, and hydraulic connections.
- Check for kinks in hydraulic lines.
- Check for a plugged or damaged fluid cooler or fluid filter.
- Check the electrical connections to solenoid valves. The problem may not be hydraulic after all.
When in doubt, you can always find factory—trained technicians at your Ditch Witch dealership, professionals whose only business is keeping Ditch Witch equipment healthy.
stopimg title="52a" style="padding-right: 20px;" align="left" alt="52a" src="/uploadedImages/Left_Nav/Press_Room/Job_Related_List/52astopimg4Your next rehab job doesn't have to tie up a crew of ten, cut off utility service to 2000 customers, or reroute 5:00 traffic. With the new line of Ditch Witch pipe bursting systems, upgrading water and sewer infrastructure is cleaner, less disruptive, and more affordable than ever.
Ditch Witch PR50, PR75, and PR95 pipe bursting systems can fracture or cut any type of water, sewer, or utility pipe (with outside diameters of 4-16 inches) and pull in new pipe with 50, 75, or 95 tons of pullback force, respectively. Ditch Witch pipe bursting systems are static as opposed to pneumatic, which characterizes the majority of pipe bursting systems on the market. Although they can be less expensive, pneumatic pipe bursting systems do not have the power or the pipe-cutting capabilities of static models, and can only replace "fracturable" pipe such as clay and PVC, typically used in sewers. Ditch Witch pipe bursting systems efficiently replace not only fracturable pipe but also pipe made of steel, ductile iron, and cast iron—all with minimal disturbance to the surrounding infrastructure.
During the pipe-bursting process, a replaceable bursting head is attached to the leading edge of the new pipe. As the bursting head is pulled back, the existing pipe is burst or split, the fragments are forced outward into the soil, and the new pipe is pulled into place along the same path as the existing utility (see graphic). The tremendous pullback force of Ditch Witch pipe bursting systems—from 99,200 to 187,400 lb—enables them to pull in pipe that is larger than the original, which effectively increases the infrastructure's capacity.
Ditch Witch pipe bursting systems are designed to increase the operator's productivity, too. An optional rod make-up device enables faster make-up times, helps the operator replace more feet per minute, and also minimizes operator fatigue. An optional extension frame provides greater setup flexibility on a variety of jobsites.
The relatively small footprint of these units minimizes disruption of adjacent utilities. But small doesn't mean fragile—each Ditch Witch PR model is engineered with heavy-duty frames and components designed to provide longer life, less wear, and less maintenance. Among its many reinforced components are heavy-duty steel shrouds that protect each unit's cylinders from damage and debris.
Ditch Witch pipe bursting systems also have few moving parts and wear items, making them easy to operate and maintain. For example, comparable models require the operator to pull and move pins to change the direction of the bore, while Ditch Witch pipe bursting systems can be switched from push to pull with the touch of a button (PR50 and PR75) or lever (PR95).
To address situations commonly encountered on the jobsite, a comprehensive set of tools and accessories—everything from wrenches to grease—comes standard with each model. Other standard features include quiet, fully enclosed power packs with load-sensing hydraulics that automatically shift the unit to high speed when there's no load, and downshift the unit when a load is introduced.
Published in the Summer 2006 issue of The Underground.
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