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The Bobcat 873 and Its Place in Compact Equipment History
The Bobcat 873 skid steer loader was introduced in the late 1990s as part of Bobcat’s 800 series, designed to offer higher lift capacity and improved operator comfort. Manufactured by Melroe Company, which later became part of Ingersoll Rand and eventually Doosan, Bobcat has been a pioneer in compact equipment since the 1960s. The 873 featured a vertical lift path, a rated operating capacity of 1,850 pounds, and a robust 73-horsepower Deutz diesel engine. With over 20,000 units sold globally, the 873 became a favorite among contractors for its balance of power, size, and reliability.
Throttle Lever Stuck at Constant Speed
One of the more frustrating issues reported by operators is a stuck throttle lever, which locks the machine at a single speed regardless of load or terrain. This problem can severely limit productivity, especially in tasks requiring variable speed control such as grading, trenching, or maneuvering in tight spaces.
The throttle lever in the Bobcat 873 is part of a mechanical linkage system that adjusts engine RPM via a cable connected to the fuel injection pump. When the lever becomes immobile, the root cause typically lies in one of two areas:
To diagnose the issue, follow these steps:
Operators familiar with earlier Bobcat models like the 843 may recall a simpler tensioning system using a single bolt and spring. This design allowed easy adjustment but was phased out in favor of more robust assemblies in the 50-series machines. The 873’s system, while more durable, requires precise washer placement and torque settings to maintain smooth operation.
Field Fixes and Preventive Measures
In one case from Tennessee, a contractor noticed his throttle would not hold position during long grading runs. He tightened the pivot bolt slightly and added a double nut to lock the tension. This simple fix restored full control and prevented further slippage.
To prevent future issues:
Throttle control is not just a convenience—it’s a safety feature. A machine stuck at high RPM can become dangerous during loading or transport. Conversely, low RPM may stall hydraulic functions mid-operation. In 2014, a landscaping crew in Oregon experienced a near-miss when a skid steer failed to decelerate approaching a trailer ramp. The cause was a seized throttle cable, which had gone unnoticed during routine checks.
Conclusion
The Bobcat 873 remains a workhorse in the compact loader category, but like all mechanical systems, it demands attention to detail. A stuck throttle lever may seem minor, but it reflects deeper wear in the control system. With proper inspection, lubrication, and timely replacement of components, operators can restore full functionality and extend the life of their machines. Whether grading a driveway or lifting pallets, throttle control is essential—and worth every minute of maintenance.
The Bobcat 873 skid steer loader was introduced in the late 1990s as part of Bobcat’s 800 series, designed to offer higher lift capacity and improved operator comfort. Manufactured by Melroe Company, which later became part of Ingersoll Rand and eventually Doosan, Bobcat has been a pioneer in compact equipment since the 1960s. The 873 featured a vertical lift path, a rated operating capacity of 1,850 pounds, and a robust 73-horsepower Deutz diesel engine. With over 20,000 units sold globally, the 873 became a favorite among contractors for its balance of power, size, and reliability.
Throttle Lever Stuck at Constant Speed
One of the more frustrating issues reported by operators is a stuck throttle lever, which locks the machine at a single speed regardless of load or terrain. This problem can severely limit productivity, especially in tasks requiring variable speed control such as grading, trenching, or maneuvering in tight spaces.
The throttle lever in the Bobcat 873 is part of a mechanical linkage system that adjusts engine RPM via a cable connected to the fuel injection pump. When the lever becomes immobile, the root cause typically lies in one of two areas:
- Lever Pivot Seizure: The pivot point where the lever rotates may rust or accumulate debris, preventing movement.
- Throttle Cable Binding: The cable itself may corrode internally or kink, restricting motion.
To diagnose the issue, follow these steps:
- Remove the throttle lever assembly by unbolting the two 3/8-inch fasteners securing it to the frame.
- Disconnect the cable from the lever and test each component independently.
- If the lever moves freely once disconnected, the cable is likely seized.
- If the lever remains stiff, inspect the pivot washers—typically three steel and one fiber washer—which provide tension and smooth rotation.
Operators familiar with earlier Bobcat models like the 843 may recall a simpler tensioning system using a single bolt and spring. This design allowed easy adjustment but was phased out in favor of more robust assemblies in the 50-series machines. The 873’s system, while more durable, requires precise washer placement and torque settings to maintain smooth operation.
Field Fixes and Preventive Measures
In one case from Tennessee, a contractor noticed his throttle would not hold position during long grading runs. He tightened the pivot bolt slightly and added a double nut to lock the tension. This simple fix restored full control and prevented further slippage.
To prevent future issues:
- Lubricate pivot points annually with lithium grease
- Inspect cable sheathing for cracks or wear
- Avoid pressure washing near control linkages
- Replace fiber washers every 1,000 hours to maintain tension
Throttle control is not just a convenience—it’s a safety feature. A machine stuck at high RPM can become dangerous during loading or transport. Conversely, low RPM may stall hydraulic functions mid-operation. In 2014, a landscaping crew in Oregon experienced a near-miss when a skid steer failed to decelerate approaching a trailer ramp. The cause was a seized throttle cable, which had gone unnoticed during routine checks.
Conclusion
The Bobcat 873 remains a workhorse in the compact loader category, but like all mechanical systems, it demands attention to detail. A stuck throttle lever may seem minor, but it reflects deeper wear in the control system. With proper inspection, lubrication, and timely replacement of components, operators can restore full functionality and extend the life of their machines. Whether grading a driveway or lifting pallets, throttle control is essential—and worth every minute of maintenance.
