Reinstalling The Pump - Nordson 3400 Manual

B 2-16
Pump

Reinstalling the Pump

B2EN-02-[3-PUMP]-5
Follow this procedure to reinstall the pump assembly and to reinstall and
adjust the drive chain.
1. Check the pump gaskets for damage and replace if necessary. Then
position the pump insulator, gaskets, and pan on the hopper mount.
2. Install the pump assembly on the hopper mount. Tighten the
hex-head screws, washers, and lock washers to
12.20–13.56 NSm (9–10 ft-lb).
3. Remove the upper bearing mount.
4. Install the drive chain. Tighten the chain-tensioning screw just
enough to keep the chain on both sprockets.
5. Reinstall the upper bearing mount. Tighten the screws to
6.78–8.14 NSm (5–6 ft-lb).
NOTE: If the pump is properly installed, you should be able to rotate
the drive shaft clockwise by exerting a maximum torque of
0.56 NSm (80 in.-oz) or a maximum force of 62.5 oz. To measure
force, use a strain gauge to move the drive chain.
6. Adjust the drive chain slack as follows:
a. Adjust the height of the speed reducer sprocket so it is level with
the drive shaft sprocket.
b. With the chain attached to both sprockets and the speed reducer
screws snug but not tightened, adjust the chain-tensioning screw
to obtain the chain-deflection dimensions shown in Figure B 2-5.
Begin tightening the speed reducer screws that are closest to the
chain-tensioning screw and check the chain tension. If the chain
becomes too tight, loosen the same screws and turn the
chain-tensioning screw counterclockwise. Move the speed
reducer to decrease the chain tension.
41-3000
Issued 11/00
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