4
Mechanical installation
Installing the gear unit
Assembly and Operating Instructions – Explosion-Proof Gear Units
35
77 – 107
max. 0.5 mm
137/147
max. 0.7 mm
157 – 187
max. 0.8 mm
Do not twist housing legs and mounting flanges against each other. Observe the per-
mitted overhung and axial loads! Observe the chapter "Project Planning" in the gear
unit/gearmotor catalog for calculating the permitted overhung and axial loads.
Strength class of
the screws
Always mount gearmotors using screws of strength class 8.8. The gearmotors in
flange-mounted design and in foot-/flange-mounted design listed in the following table
are an exception. Always use screws of strength class 10.9 for these gearmotors. Use
suitable washers.
Gear unit
Ø flange
mm
Strength class of the
screws
RF37/R37F
120
10.9
RF47/R47F
140
RF57/R57F
160
FF/FAF77
KF/KAF77
250
FM/FAM67, FM/FAM77
KM/KAM67, KM/KAM77
300
FM/FAM87
KM/KAM87
350
FM/FAM97
KM/KAM97
400
RF147
FM/FAM107
KM/KAM107
450
RF167
FM/FAM127
KM/KAM127
550
FM/FAM157
KM/KAM157
660
RZ37 – RZ87
60ZR – 130ZR
Corrosion protec-
tion for screw con-
nections
Use plastic inserts (2 – 3 mm thick) if there is a risk of electrochemical corrosion
between the gear unit and the driven machine. The material used must have an elec-
trical leakage resistance < 10
9
Ω. Electrochemical corrosion can occur between vari-
ous metals, for example, cast iron and stainless steel. Also install the bolts with plastic
washers! Additionally ground the housing. Use grounding screws on the motor.
24804134/EN – 05/2018
