Bush Hog 280 - Manual (Page 16)

SECTION V
ASSEMBLY
IMPORTANT
Tighten all fasteners to specifications on Torque
Chart unless otherwise indicated.
5-1 3-POINT LIFT MODELS (285 & 286)
A. Attach A-frame struts to mounting brackets
using 5/8” x 2” capscrews and locknuts as shown.
(Figure 5-1)
B. Place flex link and pivot tube between top of A-
frame struts. Place support yokes on outside of A-
frame struts. Fasten together using 5/8” x 6” cap-
screw and locknut.
C. Position tailwheel bracket on rear of cutter deck
as shown. (Figure 5-1) Align holes in tailwheel weld-
ment with holes in support yokes and strongbacks.
Fasten with 5/8” x 6” capscrew and locknut on the
single tailwheel bracket.
D. Place flatwasher on wheel spindle. Install
wheel on tailwheel weldment securing with roll pin.
E. Bolt adjusting bracket to cutter deck using 5/8 x
2” capscrew and locknut.
F. Place tailwheel frame into desired position and
fasten with 1/2 x 1-3/4” capscrews, lockwashers and
nuts.
G. Install Category I lift pins in front holes in
mounting brackets and fasten with 1-1/8” fine thread
nut and lockwasher.
H. Attach clutch shield to gearbox as shown in
exploded drawing in Figure 5-6.
I. Remove pivot bolt from spline end of clutch.
Remove inspection cover from clutch shield.
J. 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.
K. Loosen eight nuts retaining clutch springs
1/3 turn or until spring can be turned with fingers.
L. With tractor at idle speed, engage tractor
PTO drive 2-3 seconds. Clutch should slip with-
out turning blades.
M. 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 PRO-
CEDURE.
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.
WARNING
Figure 5-1
Flex Link
Yoke
Tailwheel Bracket
Height Adjusting Bracket
Tailwheel
Assembly
Rear Safety
Chains
Clutch Shield
Driveline
Cat. I or II Hitch Pin
Front Safety Chains
15