Removing the Oil Pan on a Bobcat 873 Skid Steer Loader

[MikePhua]

The Bobcat 873 and Its Mechanical Layout
The Bobcat 873 was introduced in the late 1990s as part of Bobcat’s high-flow skid steer lineup, designed for demanding hydraulic applications and heavier lifting. With a rated operating capacity of 2,100 lbs and an operating weight of approximately 7,400 lbs, the 873 was powered by a 73 hp Deutz BF4M1011F diesel engine. This air-cooled, four-cylinder engine was known for its compact footprint and reliability under harsh conditions.
Bobcat, founded in North Dakota in the 1950s, revolutionized compact equipment with the skid steer concept. The 873 continued that legacy, offering vertical lift geometry, auxiliary hydraulics, and a spacious cab. However, its engine placement beneath the operator compartment and frame crossmembers makes certain service tasks—like oil pan removal—challenging without proper preparation.
Why Oil Pan Removal May Be Necessary
Removing the oil pan is typically required for:

• Replacing a damaged gasket causing oil leaks
  
• Inspecting or replacing the oil pump
  
• Cleaning sludge or debris from the sump
  
• Accessing crankshaft components for rebuilds
  

Symptoms that may prompt oil pan service:

• Persistent oil seepage around pan edges
  
• Low oil pressure readings despite full level
  
• Metallic debris found during oil changes
  
• Engine knocking or lubrication faults
  

A contractor in Alberta once discovered a cracked oil pickup tube in his 873 after noticing intermittent oil pressure drops. Removing the pan revealed the issue, and replacing the tube restored proper lubrication.
Preparation and Safety Before Disassembly
Before removing the oil pan:

• Park the machine on level ground and disconnect the battery
  
• Allow engine to cool fully to avoid burns
  
• Drain engine oil completely and dispose of it properly
  
• Remove rear engine access panel and any obstructing components
  
• Use proper lifting equipment if the engine needs to be raised slightly
  

Tools required:

• Metric socket set (typically 10mm to 13mm for pan bolts)
  
• Torque wrench for reinstallation
  
• Gasket scraper and sealant
  
• Oil catch pan and shop towels
  
• Optional: engine hoist or jack for clearance
  

A technician in Chile fabricated a custom cradle to support the Deutz engine while lifting the rear of the loader frame. This allowed safe access to the oil pan without removing the entire engine.
Step-by-Step Oil Pan Removal Procedure
The oil pan on the Deutz BF4M1011F is mounted with a series of perimeter bolts and sealed with a composite gasket. To remove:

• Drain oil and remove filter to prevent mess
  
• Disconnect any sensors or brackets attached to the pan
  
• Remove skid plate or frame crossmember if obstructing access
  
• Loosen bolts in a crisscross pattern to avoid warping
  
• Gently pry the pan using a plastic scraper or soft mallet
  
• Lower the pan and inspect gasket surface and sump contents
  

Important notes:

• Avoid using metal tools that may gouge sealing surfaces
  
• Do not force the pan if it resists—check for hidden fasteners
  
• Inspect oil pickup tube and pump screen for debris or damage
  

A fleet manager in Texas added a magnetic drain plug to his 873 after pan removal. This helped capture fine metal particles and monitor engine wear over time.
Cleaning and Reinstallation Tips
Before reinstalling the oil pan:

• Clean mating surfaces with brake cleaner or solvent
  
• Inspect bolt threads and chase if necessary
  
• Install new gasket and apply sealant only if specified by manufacturer
  
• Torque bolts evenly to spec (typically 18–22 Nm for M8 bolts)
  
• Refill oil and prime system before startup
  

Recommended oil type:

• SAE 15W-40 for most climates
  
• Use high-detergent diesel-rated oil meeting API CI-4 or higher
  
• Replace oil filter with OEM or matched aftermarket unit
  

A restorer in Ontario used a fiber-reinforced gasket and anaerobic sealant during reinstallation. The combination eliminated seepage and held up under high vibration conditions.
Post-Service Checks and Monitoring
After reassembly:

• Start engine and monitor oil pressure gauge
  
• Check for leaks around pan edges and drain plug
  
• Inspect for unusual noises or pressure fluctuations
  
• Recheck torque after first heat cycle if using non-locking bolts
  

Maintenance recommendations:

• Change oil every 250 hours or annually
  
• Inspect oil pan during each service for signs of seepage
  
• Keep service records and note any gasket replacements
  

A technician in Florida added a borescope inspection to his post-repair checklist. By viewing the sump interior after reassembly, he confirmed proper pickup tube alignment and gasket seating.
Conclusion and Recommendations
Removing the oil pan on a Bobcat 873 requires careful planning, mechanical awareness, and attention to sealing surfaces. While access is limited by the loader frame and engine placement, the task is manageable with the right tools and safety precautions.
Recommendations include:

• Drain oil fully and disconnect battery before starting
  
• Use proper lifting and support methods to access pan bolts
  
• Clean and inspect all components before reinstallation
  
• Torque bolts evenly and monitor for leaks after startup
  
• Document service actions and track oil pressure trends
  

With methodical execution, oil pan service becomes a gateway to deeper engine health—ensuring the 873 continues to perform with the durability and precision that define Bobcat’s compact loader legacy.