According to the motor mounting type, there are 2 types of drilling mud agitators for mud system: Direct connection mud agitator and Coupling connection mud agitator.
Type 1: Direct connection mud agitator. The motor is mounted on a mounting plate with flange to gearbox reduce. It is the most popular type. The design is sample, but reliable. Most agitator supplier utilize direct motor connection design.
Type 2: Coupling connection mud agitator. The motor and connected to gearbox reduce via a coupling set. So the motor is not direct connected to the gearbox reducers.
The Coupling connection mud agitator has a coupling to protect the reducer and motor. In normal situation, clients only need to check and maintain the coupling set. However, there are additional wearing parts of the coupling. The disadvantage of the coupling agitator is that the coupling and its accessories need to be regularly checked on the drilling mud system. Once the coupling or accessories are damaged, they should be replaced in time, otherwise the motor and reducer will be damaged quickly.
The advantage of the direct agitator is that it is less maintenance as long as the gear oil is added. The disadvantage is that once damaged, either the reducer is damaged or the roller key of the motor shaft is damaged. It is difficult to repair. And the repair cost is high.
However, the probability of such a failure is very low and it belongs to an abnormal situation. According to the feedback records on the site, the damage probability of the agitator caused by not replacing the coupling parts in time is much higher than that of the direct connected agitator. Therefore, GN Solids Control recommended direct connect agitators. GN Solids Control standard agitator models are direct motor connection type. And most popular agitator brands provide direct connection agitator. They do not offer coupling connection agitators.