Precautions for Installing Rack and Pinion Hoist Safety Device
1. The installation bolts cannot be lower than Grade 8.8, and the 4 bolts should be tightened evenly. Normally, the construction lifts centrifugal brake SAJ3.0 use M14 bolts and SAJ4.0 use M16 bolts.
2. After installation, observe the meshing of gear and rack, ensure the clearance of the gear and rack tooth surface is in the range of 0.2~0.5mm. By visual inspection, there should be tooth side gap of gear surface. When rotating the Safety Device gear by hand, a slight swing should be felt. The tooth side clearance can also be measured by lead pressure method.
3. The normally closed contact of limit switch must be connected to the safety circuit of rack and pinion hoist (the circuit that is connected in series with the emergency stop button). It must be done!