20
GEARBOX ASSEMBLY
Place the rotor (1.1) on a flat surface. Lubricate the front and rear bearing areas of the drive and
idle shafts with grease. Insert the shafts into the rotor splines, for support. Heat the front
bearing to 250
o
F. Place the bearing over the shaft, after the bearing cooled.
Place the gearbox over the shafts.
Position the gearbox with wet end up. Insert the front bearing with shaft perpendicularly to the
gearbox. There should be a tight sliding fit between the gearbox and the bearing outer rings.
Press or soft hammer could be used.
Place the front bearing and tightened.
Rear bearing assemblies insert into the rear cover. There should be tight sliding fit.
Heat the inner ring of the rear bearing to 250
o
F. Place the inner ring over the shafts with the
flange end sliding over the shaft first.
Lubricate the gear area of the shaft and the face of the lock washer, with grease
Position both shaft gear keys to the 12:00 position.
Place the gear, lock washer (3.3) and lock nut (3.3) onto the shafts and hand tighten.
After the gears are installed, turn the shafts to make sure they turn freely and that the rotors
(1.1) are timed correctly.
Use a spanner wrench to tighten the gear lock nut (3.3) on the drive shaft. You can install the
rotors to hold the shafts in place while you tighten the nut.
Measure rolling torque with no load on bearing. Set the torque wrench to zero while rotating,
this will remove the load caused by the lip seal.
The bearing locknut should be tightened until the rolling torque on the shaft measures the
values in the following table.
Tighten the locknut (3.3) on the idle shaft, following the previous steps.
Measure the shaft endplay to be sure it is zero. If the endplay is not zero, repeat the tightening
steps. To repeat these steps, the locknut (3.3) will have to be backed off and the bearing will
have to be tapped to remove the loadings.
Install the liquid gasket to rear cover quad ring (4.12) and mount the rear cover(1.4) assembly
over the drive shaft extension onto the gearbox
Summary of Contents for AccuLAB Series
Page 1: ...Operating Maintenance Manual JEC AccuLAB Series Rotary Lobe Pumps...
Page 4: ...3...
Page 5: ...4...
Page 6: ...5...
Page 7: ...6...
Page 23: ...22 DIMENSIONAL DRAWING FOR BARE SHAFT...
Page 24: ...23 PARTS LIST EXPLODED VIEW...