Company Brush Cutter User Manual

Dealer Service 27
MAN0963 (2/16/2012)
14. Inspect housing and caps for cracks or other
damage.
Gearbox Assembly
Refer to Figure 12.
1. Clean housing, paying specific attention to areas
where gaskets will be installed.
2. Wash housing and all components thoroughly.
Select a clean area for gearbox assembly. Replace
all seals, bearings, and gaskets. All parts must be
clean and lightly oiled before reassembling.
3. Insert both output bearings (12, 20) in the housing,
using a round tube of the correct diameter and a
hand press.
4. Slide output shaft (16) from the bottom through
both bearings (12, 20) until it rests against bottom
bearing (12).
5. Slide shims (9, 10, 11) over output shaft (16). Use
the same thickness of shims that were removed as
a starting point.
6. Place gear (17) onto output shaft (16) and secure
with the nut (18) and cotter pin (19). The output
shaft must have zero end play and rotational
torque of 20 to 30 LBS-IN without the lower seal.
Tighten nut (18) as needed.
7. Press bearing cup (20) into end of the housing
closest to the gear, using a round tube of the
correct diameter and a hand press. Install cap (4 or
21) and gaskets (7, 8 or 22, 23).
8. Place gear (32) and spacers (29, 24) through top of
housing and align gear (32) and shaft (5) so that
gear spline match the shaft spline.
9. While holding gear (32) in place, slide input shaft
(5) through gear (32) and press onto bearing cone
(20).
10. Press bearing (20) over input shaft (5).
11. Slide shims (7, 8 or 22, 23) over input shaft. Install
cap (4 or 21).
12. Check input shaft end float by moving the input
shaft (5) by hand. If end float is higher than 0.004",
insert shim between housing and cap that is
closest to the gear. Repeat until end float is less
than 0.004". Check rotational torque by hand. The
torque should be less than 2.2 lbs-inch.
13. Check that the gear backlash is .015/.025 at O.D.
of gear. Adjust the backlash by adding or removing
shims (9, 10, 11) from the output shaft (16).
14. Apply grease to lower seal lips (15) and press seal
(15) over output shaft (16), using a tube of the
correct diameter. Be sure not to damage the seal
lip.
15. Press in housing so that seal is recessed. Install
retaining ring (33).
16. Press in input oil seal (6), using tube of correct
diameter. Be careful not to damage seal lip.
17. Place top cover (26) on top of housing and secure
with six cap screws (25).
18. Check gearbox housing for leaks by plugging all
holes except one. Apply 4 psi compressed air and
immerse the gearbox in water to verify that there
are no leaks.
19. Remove gearbox from water and dry off with
compressed air. Fill gearbox with SAE 80W or 90W
gear lube to the center of the horizontal shaft.
Tighten all plugs.
Gearbox Installation
NOTE: Gearbox is heavy: do not attempt to move with-
out mechanical assistance.
1. Set gearbox on cutter and fasten with bolts and
nuts. Torque bolts to 300 lbs-ft.
2. Attach crossbar (Crossbar Installation, page 37).