08-13-2025, 09:06 PM
Introduction to the Bobcat 873 Skid Steer Loader
The Bobcat 873 skid steer loader, introduced in the late 1990s, is a popular mid-sized loader known for its robust design and versatility in construction, landscaping, and agricultural tasks. It often features a Deutz engine, which provides strong power output, making it suitable for demanding load-and-carry operations. Despite its capabilities, some users report engine and hydraulic system quirks that warrant attention for optimal machine performance and longevity.
This guide offers detailed insights into the Bobcat 873’s technical characteristics, common mechanical and hydraulic issues, practical troubleshooting recommendations, terminology explanations, and maintenance tips. Real-world experiences and user scenarios provide useful context for operators and technicians managing these machines.
Key Specifications and Features of the Bobcat 873
Common Mechanical and Operational Issues
Terminology Explained
Practical Troubleshooting and Maintenance Recommendations
Case Story: Overcoming Hydraulic and Safety Interlock Challenges on a Bobcat 873
An operator acquiring a 1999 Bobcat 873 with 2700 hours faced initial issues including hard starting and intermittent loss of hydraulic engagement despite the engine running well. Investigation revealed clogged hydraulic filters neglected by the previous owner, as well as a faulty "Press to Operate" safety switch preventing some hydraulic controls.
After replacing the filters with genuine Bobcat parts and carefully bleeding the hydraulic system, flow and responsiveness improved significantly. The safety switch was accessed for cleaning and, eventually, replaced after failing testing. Subsequent operation restored full loader functionality without engine hiccups.
This real-life example highlights the importance of following manufacturer maintenance schedules for hydraulics and safety systems, especially when acquiring used machines with unknown service histories.
Summary List for Bobcat 873 Skid Steer Loader Owners
Additional Recommendations
Conclusion
The Bobcat 873 skid steer loader, while a capable and versatile machine, exhibits some common issues primarily related to its Deutz engine and hydraulic systems. Key concerns include timing belt and head gasket longevity, turbocharger wear, hydraulic filter clogging, and safety interlock malfunctions. Proper maintenance, careful inspection, and use of quality replacement parts are critical to keeping the 873 running reliably.
Real-world scenarios confirm that many operational challenges can be resolved with methodical troubleshooting of the hydraulic system and interlock controls. Operators and technicians should remain vigilant about fluid cleanliness, component wear, and electrical system health to ensure sustained productivity and safety.
This comprehensive overview combines technical detail, practical advice, terminology clarification, and user feedback to support effective management and maintenance of the Bobcat 873 skid steer loader.
The Bobcat 873 skid steer loader, introduced in the late 1990s, is a popular mid-sized loader known for its robust design and versatility in construction, landscaping, and agricultural tasks. It often features a Deutz engine, which provides strong power output, making it suitable for demanding load-and-carry operations. Despite its capabilities, some users report engine and hydraulic system quirks that warrant attention for optimal machine performance and longevity.
This guide offers detailed insights into the Bobcat 873’s technical characteristics, common mechanical and hydraulic issues, practical troubleshooting recommendations, terminology explanations, and maintenance tips. Real-world experiences and user scenarios provide useful context for operators and technicians managing these machines.
Key Specifications and Features of the Bobcat 873
- Engine:
- Often powered by a Deutz diesel engine (generally air-cooled or liquid-cooled turbocharged), known for substantial torque and fuel efficiency.
- Power output typically around 70 to 90 horsepower, depending on specific model year and configuration.
- Known engine vulnerabilities include timing belt, turbocharger, and head gasket wear requiring careful inspection.
- Often powered by a Deutz diesel engine (generally air-cooled or liquid-cooled turbocharged), known for substantial torque and fuel efficiency.
- Hydraulic System:
- Load-sensing hydraulics with dual pumps supporting boom lift, tilt functions, and auxiliary attachments.
- Hydraulic flow rates designed to handle moderate to heavy operational duties on site.
- Equipped with safety interlocks, such as the "Press to Operate" system requiring operator engagement before machine movement.
- Load-sensing hydraulics with dual pumps supporting boom lift, tilt functions, and auxiliary attachments.
- Operating Weight and Dimensions:
- Medium-weight loader, usually around 6,000 to 7,000 lbs operating weight.
- Compact footprint allowing operation in confined spaces and easy transportation.
- Medium-weight loader, usually around 6,000 to 7,000 lbs operating weight.
- Operator Controls:
- Steering levers or joystick controls, depending on model updates.
- Safety features include seat bar and pedal interlocks to prevent accidental operation.
- Dashboard includes warning lights, hydraulic and engine indicators, and diagnostic alerts.
- Steering levers or joystick controls, depending on model updates.
Common Mechanical and Operational Issues
- Deutz Engine Concerns:
- Head gasket failures due to engine overheating or timing belt problems.
- Turbocharger issues such as bearing wear leading to reduced boost and power loss.
- Timing belt replacement intervals critical to avoid catastrophic engine damage.
- Head gasket failures due to engine overheating or timing belt problems.
- Hydraulic System Complaints:
- Operators frequently report sluggish hydraulic response, especially under load, attributed to clogged hydraulic filters or air in the lines.
- Safety interlock "Press to Operate" button malfunction or failure causing inability to engage movement or hydraulics.
- Hydraulic pump noise (whining) under load indicating wear or cavitation.
- Operators frequently report sluggish hydraulic response, especially under load, attributed to clogged hydraulic filters or air in the lines.
- Electrical Control and Sensor Challenges:
- Faulty or worn safety interlock switches affecting machine start and operation.
- Wiring harness aging causing intermittent control issues or erratic gauge readings.
- Faulty or worn safety interlock switches affecting machine start and operation.
- Maintenance Access and Serviceability:
- Filters (hydraulic and engine oil) sometimes difficult to access or tightly secured, complicating regular servicing.
- Cooling system checks critical due to engine overheating history.
- Filters (hydraulic and engine oil) sometimes difficult to access or tightly secured, complicating regular servicing.
Terminology Explained
- Deutz Engine: A diesel engine brand characterized by air or liquid cooling and turbocharging for performance efficiency.
- Load-Sensing Hydraulics: A hydraulic system that adjusts output based on demand to improve fuel efficiency and response.
- Head Gasket: A critical sealing component between engine block and cylinder head, preventing coolant and combustion gas leaks.
- Turbocharger: A device that increases engine air intake pressure, enhancing power output.
- Press to Operate System: Safety interlock requiring manual engagement before allowing machine movement or operation.
- Hydraulic Cavitation: Formation of vapor bubbles in the fluid that can cause damage and reduce pump efficiency.
- Interlock Switches: Safety devices that prevent machine operation unless certain conditions (like seat bar down) are met.
Practical Troubleshooting and Maintenance Recommendations
- Engine Care:
- Replace timing belts and inspect head gaskets as per manufacturer intervals or if signs of oil or coolant mixing appear.
- Monitor turbocharger condition; listen for unusual whines or loss of power suggesting bearing wear.
- Regular coolant system flushing and thermostat checks to avoid overheating.
- Replace timing belts and inspect head gaskets as per manufacturer intervals or if signs of oil or coolant mixing appear.
- Hydraulic System Upkeep:
- Change hydraulic filters regularly to prevent flow restrictions and pump strain.
- Bleed air from hydraulic lines thoroughly post maintenance to restore smooth operation.
- Inspect and test the "Press to Operate" switch and related relays or solenoids; clean and repair worn contacts.
- Change hydraulic filters regularly to prevent flow restrictions and pump strain.
- Electrical System Health:
- Examine wiring harnesses for corrosion, damage, or loose connectors.
- Test and replace worn safety interlock switches to ensure operator safety and machine compliance.
- Examine wiring harnesses for corrosion, damage, or loose connectors.
- Operator Control Adjustments:
- Verify steering lever and pedal interlocks return properly to neutral. Lubricate and adjust as needed.
- Perform routine checks of instrument panel warning lights and sensor calibrations.
- Verify steering lever and pedal interlocks return properly to neutral. Lubricate and adjust as needed.
Case Story: Overcoming Hydraulic and Safety Interlock Challenges on a Bobcat 873
An operator acquiring a 1999 Bobcat 873 with 2700 hours faced initial issues including hard starting and intermittent loss of hydraulic engagement despite the engine running well. Investigation revealed clogged hydraulic filters neglected by the previous owner, as well as a faulty "Press to Operate" safety switch preventing some hydraulic controls.
After replacing the filters with genuine Bobcat parts and carefully bleeding the hydraulic system, flow and responsiveness improved significantly. The safety switch was accessed for cleaning and, eventually, replaced after failing testing. Subsequent operation restored full loader functionality without engine hiccups.
This real-life example highlights the importance of following manufacturer maintenance schedules for hydraulics and safety systems, especially when acquiring used machines with unknown service histories.
Summary List for Bobcat 873 Skid Steer Loader Owners
- Monitor engine coolant and oil regularly to detect early leaks or head gasket issues.
- Change timing belt on schedule to avoid engine damage risks.
- Inspect turbocharger performance and replace if loss of boost or noise occurs.
- Replace hydraulic filters proactively to maintain smooth operation.
- Bleed air carefully from hydraulic circuits after any fluid or component replacement.
- Check and maintain "Press to Operate" interlock system for operator safety and machine control.
- Inspect wiring harnesses and electrical connectors regularly for signs of wear or damage.
- Use OEM or high-quality aftermarket parts for replacements to ensure reliability.
- Keep a log of maintenance and repairs to inform future diagnostics.
- Train operators in early fault detection and correct operation procedures.
Additional Recommendations
- Obtain and use the Bobcat 873 service and operation manuals for detailed maintenance procedures and safety practices.
- Seek professional diagnostic tools or dealer assistance for unresolved hydraulic or electrical problems.
- Document all repair and maintenance work for potential resale or warranty needs.
- Consider upgrading hydraulic filters and safety switches with improved aftermarket parts for better durability.
- Participate in user forums or local operator groups to share experiences and tips on the Bobcat 873.
Conclusion
The Bobcat 873 skid steer loader, while a capable and versatile machine, exhibits some common issues primarily related to its Deutz engine and hydraulic systems. Key concerns include timing belt and head gasket longevity, turbocharger wear, hydraulic filter clogging, and safety interlock malfunctions. Proper maintenance, careful inspection, and use of quality replacement parts are critical to keeping the 873 running reliably.
Real-world scenarios confirm that many operational challenges can be resolved with methodical troubleshooting of the hydraulic system and interlock controls. Operators and technicians should remain vigilant about fluid cleanliness, component wear, and electrical system health to ensure sustained productivity and safety.
This comprehensive overview combines technical detail, practical advice, terminology clarification, and user feedback to support effective management and maintenance of the Bobcat 873 skid steer loader.
