What Should Be Replaced While the Engine Is Out of a Bobcat 753G

[MikePhua]

Removing the engine from a Bobcat 753G presents a rare opportunity to address hidden wear points and aging components that are otherwise difficult to access. To maximize reliability and reduce future downtime, several systems should be inspected and refreshed while the engine bay is open.
Machine Overview and Engine Access Context
The Bobcat 753G is part of the G-series skid-steer loaders, introduced in the early 2000s. It features a liquid-cooled Kubota V2203 diesel engine, hydrostatic drive, and a compact frame ideal for landscaping, construction, and agricultural work. With over 100,000 units sold globally, the 753G remains a popular choice in rental fleets and owner-operator businesses.
Engine removal typically occurs during a rebuild, head gasket replacement, or major oil leak repair. Once the engine is out, technicians gain access to the rear frame, hydraulic lines, cooling system, and electrical harnesses—areas that are otherwise obstructed.
Critical Components to Replace or Inspect

• Motor Mounts
  Rubber isolators degrade over time due to heat and vibration. Replace all mounts to prevent future misalignment and excessive vibration.
  
• Hydraulic Hoses and Fittings
  Inspect for abrasion, cracking, and leaks. Replace any hoses showing signs of wear, especially those routed near the engine or under the loader arms.
  
• Cooling System Components
  • Radiator: Flush or replace if fins are clogged or corroded
    
  • Thermostat: Replace to ensure proper temperature regulation
    
  • Water pump: Inspect for bearing play and seal leakage
    
  • Hoses: Replace all coolant hoses, especially molded elbows
    
• Wiring Harness and Connectors
  Check for brittle insulation, corroded terminals, and melted sections. Replace damaged sections and apply dielectric grease to all connectors.
  
• Fuel Lines and Filters
  Replace rubber fuel lines and clamps. Install a new fuel filter and inspect the pickup tube in the tank for debris or corrosion.
  
• Starter and Alternator
  Test both components. If the starter shows signs of slow cranking or the alternator has weak output, replace them while access is easy.
  
• Drive Belt and Tensioner
  Replace the serpentine belt and inspect the tensioner pulley for smooth operation. A worn belt can cause charging and cooling issues.
  
• Engine-to-Hydrostatic Coupling
  Inspect the flex plate or coupler for cracks or wear. Replace if any signs of fatigue are present.
  
• Oil Cooler and Lines
  Clean the oil cooler and replace any lines showing signs of seepage. This helps maintain hydraulic fluid temperature under load.
  

Additional Recommendations

• Flush hydraulic fluid and replace filters to remove contaminants stirred up during disassembly.
  
• Clean the engine bay thoroughly, removing built-up debris and oil residue that can trap heat and accelerate corrosion.
  
• Check frame welds and loader arm pins for cracks or excessive play while visibility is improved.
  
• Label all connections during reassembly to avoid misrouting wires or hoses.
  

Field Insight and Practical Advice
A contractor in Alberta shared that during a winter rebuild of his 753G, he discovered two hydraulic hoses nearly worn through behind the engine—hidden from view during normal service. Replacing them prevented a costly failure during spring grading season. Another operator in Georgia used the downtime to install a block heater and upgraded battery cables, improving cold starts and electrical reliability.
Conclusion
Pulling the engine from a Bobcat 753G is more than a repair—it’s a strategic maintenance window. By proactively replacing wear-prone components and inspecting hidden systems, owners can extend machine life, improve performance, and avoid future breakdowns. The key is to treat the engine-out moment as a full-system refresh, not just a single fix.