Getting a 1998 Bobcat 753 Ready for Real Work

[MikePhua]

The Bobcat 753 and Its Compact Loader Legacy
The Bobcat 753 skid steer loader was introduced in the mid-1990s as part of Bobcat’s push to refine its compact equipment lineup. With a rated operating capacity of 1,500 pounds and a 43-horsepower diesel engine—typically an Isuzu or Kubota—the 753 became a favorite among landscapers, contractors, and property owners. Its nimble frame, mechanical simplicity, and hydraulic versatility made it ideal for tight jobsites and multipurpose use.
Bobcat, founded in North Dakota in 1947, revolutionized the compact loader market with its original M60 in the 1960s. By the time the 753 rolled out, the company had already sold hundreds of thousands of machines globally. The 753 was part of the “B-series” generation, known for improved operator comfort and better hydraulic flow.
First-Time Ownership and Service Priorities
Purchasing a used 753—especially a 1998 model—requires a methodical approach to servicing. Without a known maintenance history, the first priority is a full fluid and filter change. This includes:

• Engine oil and filter
  
• Hydraulic oil and filter
  
• Fuel filter
  
• Air filter
  
• Radiator coolant
  
• Chain case oil
  

The chain case, often overlooked, tends to accumulate water over time due to condensation and environmental exposure. Milky oil is a common sign of contamination. Draining it requires removing the front plug and lifting the rear end to allow full evacuation. Expect about 10 gallons of fluid.
Terminology and Component Notes
- Chain Case: A sealed compartment housing the drive chains and sprockets. Requires periodic oil changes to prevent wear.
- Case Drain Filter: A small copper filter located near the hydraulic motors or tank, responsible for capturing fine debris from motor leakage.
- Pintle Arm: A linkage component in the steering system that affects neutral positioning and directional control.
- Throttle Linkage: Mechanical connection between the hand throttle and engine governor, critical for maintaining RPM under load.
Drive Behavior and Pivoting Issues
After servicing, some operators notice that the machine drives smoothly forward and backward but shakes or sputters when pivoting—where one wheel moves forward and the other backward simultaneously. This behavior can stem from:

• Low hydraulic fluid
  
• Dirty or clogged case drain filters
  
• Loose drive belt
  
• Improper throttle setting
  
• Uneven tire pressure
  

Running the machine at idle exacerbates the issue. These machines are designed to operate at ¾ to full throttle during movement, especially when turning. Low RPMs reduce hydraulic pump output and cause the drive motors to strain, leading to vibration and noise.
One operator noted that the machine performed well when cold but began to whine and shake after warming up. This suggests a possible restriction in the hydraulic flow—often traced to inline filters or worn pump components.
Steering Linkage and Neutral Plate Alignment
Loose steering levers or uneven response can indicate wear in the pintle arms or misalignment of the neutral plate. If one lever moves more than the other before engaging, the machine may creep or steer unevenly. Checking for play in the linkage and inspecting the pintle arms for wear is essential.
Adjustments can be made by loosening the linkage bolts and realigning the arms to ensure equal engagement. This improves control and reduces stress on the hydrostatic system.
Cleaning and Cab Maintenance
Under-cab cleaning is often neglected but critical for long-term reliability. Dirt and grease buildup around hydraulic lines and motor compartments can trap heat and accelerate wear. Using a hot water pressure washer with detergent—such as a Hotsy system—can blast out debris without damaging sensitive components.
Drain holes near the drive motor plates allow water and grime to escape. Removing side covers provides better access for cleaning and inspection.
Recommendations for New Owners
To get the most out of a used Bobcat 753:

• Perform a full fluid and filter change before first use
  
• Run the machine at proper throttle settings during operation
  
• Inspect and adjust steering linkage for neutral alignment
  
• Clean under the cab and around drive motors thoroughly
  
• Monitor tire pressure to ensure balanced turning
  
• Replace case drain filters and inspect hydraulic hoses for wear
  

If the machine shakes during pivoting, check for belt tension, throttle response, and hydraulic restrictions. A squealing belt may indicate slippage, especially under load.
Conclusion
The Bobcat 753 remains a capable and enjoyable machine for property maintenance, landscaping, and light construction. With proper servicing and attention to hydraulic behavior, even a 1998 model can deliver years of reliable performance. For first-time owners, the learning curve is steep—but the satisfaction of mastering a skid steer is worth every drop of hydraulic oil. In compact equipment, precision starts with preparation—and the 753 is ready to prove it.