Semi-Mount Model (287); Quick Hitch Model (287) - Bush Hog 280 Series Operator's Manual

5-3 SEMI-MOUNT MODEL (287)

A. For mounting dual tailwheels, position tailwheel
brackets at the rear tubes located in the strong-
backs. (Figure 5-2) Align holes in tailwheel weld-
ment with holes in strongback. Install pivot bushings
and fasten with 3/4" x 8" capscrews and flange lock-
nuts. Pin ratchet or lift cylinder (8" stroke) to axle
and deck assembly.
B. Place flatwashers on wheel spindles. Install
wheels on tailwheel weldment securing with roll pins.
C. Refer to Figure 5-3 and arrange lift pin and
spacers as shown. Fasten lift pin with klick pin.
D. Attach clutch shield to gearbox as shown in
exploded drawing in Figure 5-6.
E. Remove pivot bolt from splined end of clutch.
Remove inspection cover from clutch shield.
F. Slide clutch onto gearbox input shaft aligning
bolt hole with slot in input shaft. Fasten with pivot
bolt, lockwasher and nut. Torque to 30 ft./lbs.
G. Loosen eight nuts retaining clutch springs
1/3 turn or until spring can be turned with fingers.
H. With tractor at idle speed, engage tractor
PTO drive 2-3 seconds. Clutch should slip with-
out turning blades.
I. Retighten nuts to original position. If adjust-
ment is necessary, refer to Section 4-6.
WARNING
OVER-TIGHTENING
MAY CAUSE DAMAGE TO IMPLEMENT
AND / OR TRACTOR
RECT SLIP
SETTING. ALWAYS
PROPER ADJUSTMENT PROCEDURE.
J. Fill gearbox with EP80W-90 gear oil to check
plug on rear of gearbox. Allow time for oil to
seep through bearings into lower housing.
Replace temporary plug with vent plug supplied
in operator's manual package.

5-4 QUICK HITCH MODEL (287)

(Refer to Figure 5-2 and Photo in Section II,
Preparation For Use. Also refer to exploded
drawing on page 21.)
A. Attach A-frame struts to mounting brackets
using 5/8" x 2" capscrews and locknuts.
B. Top plates can be secured to the A-frame struts
using two 5/8" x 5-1/2" capscrews and locknuts and
spaced by 2-3/8" diameter by 2-1/16" long bushing.
Install a 1" x 4-1/2" capscrew and a 1-1/4" diameter
by 2-1/16" long bushing and a nut and lockwasher to
the front portion of the top plate.
C. Align holes in the pivot arm installing a 1" diam-
eter by 1-1/16" long bushing and securing with a
3/4" x 4" capscrew, lockwasher and nut.
SPRING NUTS
DUE TO INCOR-
CLUTCH TORQUE
FOLLOW THE
D. Attach support yokes to the outside of the pivot
arm using two 1" diameter x 11/16" long bushings,
3/4" x 2-1/2" capscrews, lockwashers and nuts.
E. Attach the opposite ends of the support yokes
over the welded strongback tubes which are located
closest to the gearbox using 5/8" x 8" capscrews,
flatwasher and locknut.
F. For single tailwheel mounting position tailwheel
bracket on rear of cutter deck as shown. (Figure 3-
1) Align holes in tailwheel weldment with holes in
support yokes and strongback tubes (tubes located
closest to the gearbox). Fasten with the 5/8" x 8"
capscrews, flatwasher and locknut.
G. Place flatwasher on wheel spindle. Install
wheel on tailwheel weldment securing with roll pin.
H. Bolt adjusting bracket to cutter deck using 5/8"
x 2" capscrew and locknut.
I Place tailwheel frame into desired position and
fasten with 1/2" x 1-3/4" capscrews, lockwashers
and nuts.
J. For mounting dual tailwheels, position tailwheel
brackets at the rear tubes located in the strong-
backs. (Figure 3-2) Align holes in tailwheel weld-
ment with holes in strongback. Install pivot bush-
ings and fasten with 3/4 x 8" capscrews and flange
locknuts. Pin ratchet or lift cylinder to axle and deck
assembly.
K. Install lift pins and spacers according to Figure
5-3. Fasten lift pin with klick pin.
L. Attach clutch shield to gearbox as shown in
exploded drawing in Figure 5-6.
M. Remove pivot bolt from splined end of clutch.
Remove inspection cover from clutch shield.
N. Slide clutch onto gearbox input shaft aligning
bolt hole with slot in input shaft. Fasten with pivot
bolt,lockwasher and nut. Torque to 30 ft./lbs.
O. Loosen eight nuts retaining clutch springs
1/3 turn or until spring can be turned with fingers.
P. With tractor at idle speed, engage tractor PTO
drive 2-3 seconds. Clutch should slip without
turning blades.
Q. Retighten nuts to original position. If adjust-
ment is necessary, refer to Section 4-6.
OVER-TIGHTENING SPRING NUTS MAY
CAUSE DAMAGE TO IMPLEMENT AND / OR
TRACTOR DUE TO INCORRECT SLIP CLUTCH
TORQUE SETTING. ALWAYS FOLLOW THE
PROPER ADJUSTMENT PROCEDURE.
N. Fill gearbox with EP80W-90 gear oil to
check plug on rear of gearbox. Allow time for oil
to seep through bearings into lower housing.
Replace temporary plug with vent plug supplied
in operator's manual package.
17
WARNING