For example, seals consisting of hemp, teflon tape or cone-shaped screw
connections are not considered to be suitable, since this type of seal may
stress the connection thread at the motor to an unreasonably high extent
and/or damage it permanently.
The machine manufacturer is responsible for ensuring that the
coolant connection is tight and for verifying and accepting the
tightness after the motor has been installed.
Additionally, record regular monitoring of the proper state of the
cooling connection in the maintenance plan of the machine.
Quick coupling
It is also possible to use a quick coupling for the coolant port. The quick cou‐
pling features leak protection on either side and can be released even under
full pressure.
If a motor with this type of coolant port is ordered, all quick coupling parts are
included in the motor delivery. Based on the ambient conditions of the motor,
the user can select from two quick coupling mounting methods.
1. Method A: Lock nipple mounted on the motor side
2. Method B: Coupling mounted on the motor side
① Connection thread on the motor
②④⑦ Seal
③ Double nipple
⑤ Lock nipple
⑥ Coupling
⑧ Threaded adapter for tube
Fig. 9-10: Quick coupling mounting methods
First, connect the double nipple of the quick coupling with the
coupling or the sealing nipple of the quick coupling. Then screw
the double nipple into the connection thread on the motor. This
procedure prevents any multiple stress on the connection thread
in the motor during mounting.
When mounting the quick coupling, ensure
● the correct position of the seals and
● the tightening torques between the individual coupler components speci‐
fied below.
DOK-MOTOR*-IDYN*A*EXPD-IB05-EN-P Bosch Rexroth AG 47/69
Rexroth MAD and MAF Motors in EX px d Design acc. to ATEX Directive 2014/34/EU
Connection system
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