Champion 740 Rear Drum Removal and Service Strategy

[MikePhua]

Champion’s Grader Legacy and the 740 Series
Champion Road Machinery, founded in Canada in the early 20th century, built its reputation on durable motor graders used across North America and beyond. The 740 series, introduced in the late 1980s and refined through the 1990s, was a mid-weight grader designed for municipal road maintenance, forestry access, and construction site grading. With an operating weight around 30,000 lbs and a Cummins-powered drivetrain, the 740 offered a balance of power and maneuverability. Its rear axle and drum brake system were engineered for long service life but require specialized procedures when disassembly is needed.
Core Specifications

• Engine: Cummins 6CTA8.3, 215–250 hp
  
• Transmission: 8-speed powershift
  
• Rear axle: Tandem drive with planetary hubs
  
• Brake type: Internal wet disc or external drum (depending on variant)
  
• Drum diameter: Approx. 16–18 inches
  
• Drum mounting: Press-fit over splined axle shaft with retaining nut and washer
  

The rear drum assembly plays a critical role in braking and torque transfer. When removal is necessary—whether for bearing replacement, seal service, or brake overhaul—technicians must navigate tight clearances and heavy components.
Terminology Notes

• Drum Brake: A braking system where shoes press outward against a rotating drum to create friction.
  
• Axle Nut: A large threaded fastener securing the drum and hub to the axle shaft.
  
• Retaining Washer: A hardened steel washer that distributes load and prevents nut loosening.
  
• Splined Shaft: A shaft with ridges that mate with internal grooves in the drum to transmit torque.
  

Disassembly Strategy and Field Techniques
Removing the rear drum on a Champion 740 requires a methodical approach. The drum is press-fit over the splined axle and held by a large nut and washer. Over time, corrosion and torque loads can cause the drum to seize, making removal difficult.
Recommended steps:

• Remove the axle nut using a 3/4" or 1" drive socket and breaker bar
  
• Extract the retaining washer and inspect for wear or deformation
  
• Apply penetrating oil around the drum hub and splines
  
• Use a hydraulic puller or fabricated press tool to break the drum free
  
• Support the drum with a jack or sling to prevent sudden drop
  

In one case, a technician in Alberta fabricated a puller using a 1" steel plate drilled to match the drum bolt pattern. He welded a center boss and used a 20-ton bottle jack to press against the axle end. After heating the drum hub with a torch and applying tension overnight, the drum released with a loud pop.
Common Challenges and Solutions

• Stuck Drum: Caused by rust or spline galling. Use heat and hydraulic force.
  
• Deformed Washer: Replace with OEM-grade hardened steel to prevent future loosening.
  
• Damaged Splines: Clean with a wire brush and inspect for wear. Minor burrs can be filed.
  
• Brake Shoe Contamination: If oil seals leak, shoes may be saturated. Replace and clean thoroughly.
  

Preventive Maintenance Recommendations

• Inspect axle nuts and washers every 1,000 hours
  
• Apply anti-seize compound to splines during reassembly
  
• Replace seals and bearings during drum service to avoid repeat labor
  
• Torque axle nut to factory spec using calibrated wrench
  
• Record drum removal date and condition for fleet tracking
  

Anecdote from the Field
In Montana, a county road crew attempted to remove a rear drum using a chain and loader bucket. The drum refused to budge until they fabricated a puller from scrap grader blade steel. After two days of soaking and tensioning, the drum came off clean. They later added a drum removal kit to their service truck, saving hours on future jobs.
Champion’s Transition and Support
Champion was acquired by Volvo Construction Equipment in the late 1990s. While the 740 series is no longer in production, parts support continues through legacy dealers and aftermarket suppliers. Technicians working on these machines often rely on scanned manuals, community knowledge, and field improvisation.
Conclusion
Rear drum removal on the Champion 740 is a demanding but manageable task with the right tools and strategy. Understanding the drum’s press-fit design, spline interface, and retaining hardware is essential for safe and effective service. With proper preparation, technicians can overcome stuck components and restore braking performance. The 740’s enduring presence in fleets across North America is a testament to its rugged design—and the ingenuity of those who keep it running.