Rotary Tillers Gearboxes

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Rotary Tillers Gearboxes – Replacement of Comer Code TB-278C

Rotary Tillers Gearboxes – Replacement of Comer Code TB-278C
  • Various (agricultural) applications
  • Mowers
  • Multi-row rotary tillers
Consists of
  • Gearbox
  • Without oil
Technical information
  • If you have any questions regarding performance at different speeds, please do not hesitate to contact us
  • When using for the first time, replace the oil after 50 operating hours
Max. output torque
100.8 daNm
Contains oil
Max. oil capacity
1.6 l
Max. oil change interval
500 h
Oil SAE viscosity grade
Housing material
Cast iron GG25
24 kg
Gear arrangement Reducing
5 – 6
Gear ratio
Input shaft Reducing
Input power KW / HP Reducing
36.8 / 50 kW/HP
Ratio Increasing
Ratio Reducing
1,6 : 1
Shaft X
41,45 mm hexagonal (C)
Shaft Z
1 3/8″ (6) (A)


Industry-standard mounting dimensions
Thread-in mounting style
Best-in-class backlash
Four gear ratios available (5:1, 10:1, 15:1, 25:1)
Mounting hardware is roofed for attaching to SureServo motors
Right-angle reducer utilizes a spiral bevel gear; motor could be located at a 90 deg. position from the reducer, providing a more compact footprint
Helical-cut planetary gears for calm procedure and reduced vibration
Uncaged needle roller bearings for high rigidity and torque
Adapter bushing connection for basic and effective attachment to many servo motors
High-viscosity, anti-separation grease will not migrate from the gears; no leakage through the seal
Maintenance free: you don’t need to replace the grease for the life of the unit
At nominal speed, service life is definitely 20,000 hours
Can be positioned in any orientation
5-year warranty


The gearbox is the principal mechanical component of the kinematic chain of agricultural machines. It is normally pushed by the tractor electrical power get-off through the PTO shaft and the gearbox drives. The running torque can also be transmitted to the gearbox by hydraulic motors or belt pulleys, in addition to chain gears.

Gearboxes constantly have 1 enter shaft and at the very least a single output shaft. If these shafts are positioned at 90° to every single other, the gearbox is an ORTHOGONAL ANGLE gearbox or a lot more typically called a appropriate-angle gearbox.

Agricultural gearbox te chnical requirements



1. There must be no mechanical damage or casting defects such as cracks and holes in any part of the agricultural gearbox.

2. The surface of the gearbox of the machine tool should be kept clean, and the surface finish of the shaft should not be lower than 76.

3. The ellipticity of each shaft hole of the agricultural machinery gearbox is not greater than 0.015-0.02mm.

4. The irregularity of the center line of each shaft hole is not more than 0.04mm, and the length is 100mm.

5. Wheelbase of agricultural machinery gearbox.

6. The relationship between the bearing hole and the bearing seat of the agricultural gearbox.

How to Maintain a PTO Gearbox?

If your PTO gearbox does not work properly, you will have to replace this agricultural gearbox. There are many reasons why you might want to change it. Here are some of the reasons. You will also need to check the compatibility. It will be difficult to find a PTO gearbox for a larger model. But if you are not sure, you should visit a dealer or technical support center to learn more.

Ensure that the working temperature of your PTO gearbox is below 102 degrees Celsius. Ensure that the torque figures in the technological chart of your PTO gearbox are constant – you will be operating the gearbox under intermittent conditions, so they can be over 20% higher than they are in normal operating conditions. You should also remember that you should always change the gear oil in your PTO gearbox if you are not using it for a long time.

You can buy PTO gearbox 90 degrees to use for agricultural machinery. These are useful for connecting gear pumps to your farm tractor. They are made of substantial mechanical resistance iron or shell-sound aluminum. They are made according to the ISO/DIN 3990-88 expectations. Besides, Stub teeth ensure that the resistance is high, and they run quietly. Theses PTO gearboxes are also made for higher power handling rates.
For 60 years we have been manufacturing PTO shafts, safety devices, torque limiters, gearboxes, speed multipliers and speed
reducers for agricultural mechanization.