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Installation, Operation and Maintenance Manual
Unimaster Dust Collectors – Series UMA 40-750
33
MAINTENANCE
Renewal of fan bearings (fig. 13)
1 Isolate electrical supply and remove fan chamber lid.
2 Disconnect electrical wiring to terminal box.
3 Remove the four bolts securing the motor drive bed-plate and withdraw the
complete assembly from the unit case.
4 Loosen, but do not remove, the four socket screws in the base flange and
withdraw drive cover.
5 Remove drive belt.
6 Remove the six nuts securing flange of bearing housing to the bed-plate and
withdraw the housing.
7 Remove fan pulley and the six bolts securing the fan case.
8 Remove fan impeller and fan case.
9 Remove end caps and spacers from fan bearing housing.
10 Remove fan bearings.
11 Fit new bearings, ensuring that the fan end bearing is flush with bearing
housing.
12 Flush out bearings with a degreasing solvent (a special high temperature
grease is required as step '14').
13 When inside of bearings is dry, apply a small amount of light oil to the bearings
and spin the shaft round.
14 Repack with Shell Alvania ET3 grease (or equivalent) as shown in figure
13.
15 Secure bearing end caps and reassemble all other items to shaft, tightening
up securely.
16 Refit fan unit to bed-plate. (Air discharge towards motor).
17 Tension drive belt as shown in figure 14.
18 Replace drive cover and tighten four socket screws.
19 Reconnect electrical wiring to terminal box.
20 Recheck fan rotation (see fig. 14).
Figure 14 V-belt tensioning (UMA 40MM)
2 kg force should give
6 mm deflection