Fuerst FB42, Operator'S Manual

Page: 73 / 82

Maintenance Section 5-11
MAINTENANCE
FB42 08/01
© 2004
Alamo Group Inc.
MAINTENANCE
MAIN GEARBOX
1. Remove bearing (Ref. #8 Figure 8 ) from inside main housing. A special slide hammer puller (PROTO No. 4056)
or equal may be required to remove bearing. Press in new bearing using driving tube or pipe with approximate same
OD. as bearing. Seat outer race of bearing against shoulder in housing.
GEARBOX ASSEMBLY STEPS
Clean and scrape all gasket surfaces.
A.
1.
Insert output shaft assembly into main housing and press into place. NOTE : Use pipe or tube with approximate
same OD. as bearing and press into place by striking or pressing on tube.
2. Prelube lower bearing.
3. Place lower gasket in place and then carefully slide bearing retainer cap assembly down shaft.
4. Install bolts and lockwashers and torque to 40-50 ft. lbs.
B.
1.
Assemble three shims onto input shaft housing. Insert input shaft assembly into main housing by installing shaft
end into bearing in main housing. It may be necessary to rotate shaft to align gear teeth so that housing will install
completely.
2. Install washers and bolts and torque to 40-50 ft. lbs.
3. Gear backlash check procedure ( Figure 12 ). Install 1/2 x 3 capscrew through shear pin hole. Install flat washers
to take up 1/2" space and then install nut and tighten so bolt cannot move. Clamp gearbox to something solid so
it will not move when shaft is rotated by hand. Measure 1-1/2 inches from side of shaft to point on bolt and mark
(See
Figure 12 ). Set dial indicator at marked point, then while holding bottom shaft so it will not rotate, rotate the
input shaft back and forth noting extreme indicator reading. If total indicator deflection reading does not fall between
.006 to .018, then shims (Ref. #12
Figure 8 ) will have to be added to increase backlash or deleted to decrease
backlash.
FIGURE 12
INPUT
SHAFT
INDICATOR CHECK POINT
1-1/2