Remanufacturing the Volvo 22737 Drop Box: A Complete Guide
Few components are as critical as the 22737 drop box when it comes to keeping Volvo articulated haulers running at peak performance. Found in models like the Volvo A25 and A30 series trucks, the drop box plays a vital role in transferring power from the transmission to the axles, ensuring proper torque distribution across tough terrain.
Over time, the heavy demands of construction, quarrying, and mining can wear down this drivetrain component. Instead of investing in a costly new unit, many fleet managers and equipment owners turn to remanufactured 22737 drop boxes as a reliable and cost-effective solution.
What Is a 22737 Drop Box?
The drop box—sometimes called a transfer case—is a gearbox mounted between the transmission and the drive axles. Its main functions include:
- Splitting torque between front and rear axles
- Providing gear reduction for maximum pulling power
- Allowing all-wheel-drive functionality in off-road conditions
The 22737 model is a heavy-duty version designed specifically for Volvo articulated dump trucks, built to handle high loads and continuous operation.
The Remanufacturing Process
Remanufacturing a 22737 drop box is not just a repair—it’s a complete rebuild that restores the unit to like-new performance. Below is the step-by-step process followed by leading specialists:
1. Inspection & Teardown
The drop box is fully disassembled. Every gear, shaft, and housing is inspected for cracks, wear, and defects. Worn-out parts are tagged for replacement.
2. Cleaning & Preparation
Reusable components are cleaned using industrial washing systems, bead blasting, or chemical baths. Machined surfaces are checked against OEM tolerances.
3. Component Replacement
- All bearings, seals, O-rings, and gaskets are replaced
- Worn gears, shafts, or housings are machined or replaced
- OEM-grade hardware is used to ensure integrity
4. Machining & Rebuilding
- Housings may be line-bored to restore alignment
- Damaged gear teeth are re-machined or replaced
- Shafts are reconditioned to factory tolerances
5. Reassembly
The unit is reassembled using precise OEM specifications. Clearances, backlash, and gear mesh are adjusted for optimal performance.
6. Testing
On a test stand, the drop box is run under load to check for proper operation, vibration levels, oil flow, and leaks.
7. Finishing & Quality Control
The unit is painted, labeled, and given a final inspection to confirm it meets or exceeds OEM standards.
Why Choose Remanufacturing?
Choosing a remanufactured 22737 drop box offers major advantages:
- Cost Savings – Often 40–60% less than buying new
- Faster Turnaround – Avoid long lead times for OEM parts
- Sustainability – Extends the life of existing components
- Warranty Backed – Reman units are tested and guaranteed
Final Thoughts
The Volvo 22737 drop box is a hardworking component designed for some of the toughest conditions in the industry. When wear and tear take their toll, remanufacturing offers a proven way to restore performance, reduce costs, and extend equipment life. For fleet managers, contractors, and operators, investing in a remanufactured drop box ensures reliability without the premium price of a brand-new unit.