Many Bobcat 743 units still in use today experience age-related wear, maintenance issues, and component failures. Understanding the most common Bobcat 743 problems can help operators diagnose issues early, reduce downtime, and extend the machine’s working life.
743 Bobcat Problems
1. Engine Starting and Performance Problems
One of the most common complaints with the Bobcat 743 is difficulty starting, especially in cold conditions. Hard starting is often caused by weak glow plugs, worn injectors, air leaks in the fuel system, or a failing fuel lift pump. If the engine cranks but does not start easily, checking glow plug resistance and ensuring proper fuel delivery should be the first steps.
Engine power loss is another frequent issue. Operators may notice sluggish acceleration, reduced lifting power, or excessive black smoke from the exhaust.
These symptoms usually point to clogged fuel filters, restricted air intake, or worn injectors. Regular replacement of fuel and air filters is essential, especially since many 743 units operate in dusty environments.
2. Hydraulic System Issues
Hydraulic problems are among the most serious Bobcat 743 issues because they directly affect lifting, steering, and attachment operation. A common symptom is slow or weak lift and tilt functions. This is often caused by low hydraulic fluid levels, contaminated fluid, or a worn hydraulic pump.
Hydraulic leaks are also common due to aging hoses and seals. Over time, rubber hoses become brittle and develop cracks, leading to fluid loss and pressure drops. Leaks around the control valve or lift cylinders can cause uneven operation and should be addressed promptly to avoid further damage.
Another hydraulic concern is overheating. If the hydraulic oil becomes too hot, the machine may lose performance or shut down. This can be caused by a clogged hydraulic cooler, dirty oil, or excessive internal pump wear.
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3. Drive and Steering Problems
The Bobcat 743 relies on a hydrostatic drive system, which can develop problems as the machine ages. Operators may notice uneven steering, jerky movements, or loss of power on one side. These symptoms often indicate worn drive motors, air in the hydraulic system, or internal leakage in the hydrostatic pumps.
Chaincase issues are also common. Worn chains, low chaincase oil, or damaged sprockets can cause grinding noises and poor traction. Regular inspection and proper lubrication of the chaincase are critical for preventing costly repairs.
4. Electrical System Failures
Electrical problems are frequent in older Bobcat 743 machines due to corroded wiring, worn switches, and poor grounding. Common issues include non-functional gauges, intermittent starting, and failure of safety interlock systems.
A weak or failing alternator can cause battery drain, leading to repeated no-start situations. Corrosion at battery terminals or ground connections can also interrupt electrical flow. Keeping electrical connections clean and protected from moisture can significantly reduce these problems.
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5. Cooling System Concerns
Overheating is another issue many Bobcat 743 owners face. A clogged radiator or oil cooler is often the root cause, especially in machines used for land clearing or demolition. Dirt and debris can restrict airflow, causing engine temperatures to rise quickly.
Worn fan belts, faulty thermostats, or leaking coolant hoses can also contribute to overheating. Regular cleaning of cooling components and routine inspection of belts and hoses are essential preventive measures.
6. Loader Arm and Lift Cylinder Wear
Excessive play in the loader arms or uneven lifting can indicate worn bushings and pins. Over time, these components wear due to constant movement and heavy loads. Ignoring this issue can lead to poor bucket control and accelerated structural wear.
Lift cylinder leaks are another common problem. Seals degrade with age, allowing hydraulic oil to leak internally or externally. This results in drifting arms or reduced lifting capacity.
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7. Brake and Parking Brake Issues
The Bobcat 743 uses a mechanical parking brake system that can become unreliable over time. A weak or non-functional parking brake is often caused by worn brake discs, stretched cables, or improper adjustment. Regular inspection and adjustment can restore proper braking performance.
Preventive Maintenance Challenges
Many Bobcat 743 problems stem from deferred maintenance. Because these machines are older, parts wear faster, and neglected service intervals can quickly lead to failures.
Dirty fluids, clogged filters, and a lack of lubrication accelerate wear on critical systems.
Using the correct fluids, maintaining proper fluid levels, and following recommended service schedules can significantly reduce breakdowns and extend machine life.
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FAQs
What engine does a 743 Bobcat have?
The Bobcat 743 is powered by a Kubota V1702 diesel engine. It is a four-cylinder, liquid-cooled engine that produces approximately 36 horsepower and is known for good fuel efficiency and long service life when properly maintained.
How to tell if a Bobcat hydraulic pump is bad?
A failing hydraulic pump on a Bobcat 743 usually shows clear warning signs. Common symptoms include slow or weak lift and tilt functions, delayed response when operating the controls, jerky or uneven movement, and unusual whining or grinding noises from the hydraulic pump area. Overheating hydraulic oil and loss of pressure, even with proper fluid levels, can also indicate internal pump wear.
How much is a 743 Bobcat worth?
The value of a Bobcat 743 depends on its overall condition, operating hours, maintenance history, and whether it includes attachments. In general, most used Bobcat 743 machines sell in the mid to upper four-figure range, while well-maintained units in good working condition can reach the low five-figure range in some markets.
What year did Bobcat make the 743?
The Bobcat 743 was manufactured primarily during the 1980s and into the early 1990s. It was one of Bobcat’s popular mid-size skid steer loaders during that period and remains common on the used equipment market today.
What’s the lifting capacity of a 743 Bobcat?
The Bobcat 743 has a rated operating capacity of about 1,300 pounds. This rating represents 50 percent of the machine’s tipping load, making it suitable for general material handling, landscaping, and light construction tasks.
Final Thoughts
The Bobcat 743 remains a capable and dependable skid steer when properly maintained, but age-related problems are inevitable. Engine starting issues, hydraulic wear, drive system problems, electrical faults, and cooling concerns are among the most common challenges owners face. By understanding these issues and addressing them early, operators can avoid costly repairs and keep their Bobcat 743 working efficiently for years to come.
