8110 Unimog MOD, v2

The first version of the Unimog 8110 was staying on the shelf for almost a year before I decided to improve it.

The front and rear axles remain the same. I added a second XL motor for driving and connected them both to the center differential. Unlike the original set, I decided to use a 28 bevel tooth differential here. The reason for this decision is the easier placement and connection of the XL motors.

I took non-original XL motors, which have higher RPM than the original ones, to achieve higher speed. The truck also got a center differential lock activated by a CaDA micromotor.

Unfortunately, the center differential turned out to be a weak point. Due to the lack of support, it sometimes made a crackling sound under load, especially when changing driving direction. A possible solution I thought of is to add two beams on the left and right instead of 14 tooth gears. But in this case, I would have lost the ability to lock the differential, which is necessary for the trial truck.

Specs

  • Steering: PF Servo motor, based on MOC-3286
  • Propulsion: 2 * PF XL motors (non-original with higher RPM) - both connected to the central differential
  • Full-time AWD with lockable center differential (CaDA micro motor)
  • Open differentials in axles (no locks)
  • Turning diameter (by wheels):
    • Central diff open: 120cm
    • Central diff closed: 125cm
  • Front PTO: PF L motor
  • Rear PTO: none
  • Without pneumatics
  • 3 PF receivers - 2 receivers operate on the same channel and each controls its own XL motor, the third receiver controls the front PTO and the central diff lock
  • Custom rear LED lights
  • Powered by 3 x 18650 LiPo batteries with a DC step down converter

Gearing:

20:28 (central differential) -> 12:28 (differentials in axles) -> 8:24 (portals)

Final ratio: 9.79:1

Photos