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1-1 INTRODUCTION
We are pleased to have you as a Bush Hog cus-
tomer. Your 280 Series Rotary Cutter has been
carefully designed to give maximum service with
minimum down time. This manual is provided to
give you the necessary operating and maintenance
instructions for keeping your rotary cutter in top
operating condition. Please read this manual thor-
oughly. Understand what each control is for and
how to use it. Observe all safety precautions
decaled on the machine and noted throughout the
manual for safe operation of implement. If any
assistance or additional information is needed, con-
tact your authorized Bush Hog dealer.
1-2 DESCRIPTION
The 280 Series rotary cutters (Figure 1-1) are
designed for medium duty applications such as
grass, corn stalks and light brush. These cutters are
single spindle with two free-swinging blades. Free-
swinging blades reduce the shock of impact when a
stationary object is hit. Additional protection is pro-
vided by a slip clutch on the gearbox input shaft. A
round blade holder allows the cutter to “ride over”
stumps and similar immovable objects. Models 285
and 286 are attached to the tractor using a standard
Cat. I or II 3-point hitches. The 287 can use Cat. I
and II standard and quick hitch or semi-mount.
Standard equipment includes driveline shields,
clutch shields and front and rear discharge shields
(deflectors). NOTE: Dealer or purchaser may elect
to delete front and rear discharge shields (deflec-
tors) at their option. Refer to “WARNING” in Section
3-3.
NOTE
All references made to right, left, front, rear, top or
bottom are as viewed facing the direction of forward
travel with implement properly attached to tractor.
SECTION I
INTRODUCTION AND DESCRIPTION
Table 1 Technical Specifications
SERIES 285 286 287
Cutting Width 5’ 6’ 7’
Transport Width 66” 78” 90”
Length 103” 115” 127”
Hitch 3-Point Category I 3-Point Category I 3-Point Category I & 2
(Cat. II PIns Optional) (Cat. II PIns Optional) (Standard & Quick Hitch)
Cutting Height 1-1/2” - 10-1/2” 1-1/2” - 10-1/2” 1-1/2” - 10-1/2”
Cutting Capacity 2” Diameter 2” Diameter 2” Diameter
Driveshaft ASAE Category 4 ASAE Category 4 ASAE Category 4
Gearbox 540 RPM (90 HP) 540 RPM (90 HP) 540 RPM (90 HP)?
Blades 1/2” x 4” Uplift 1/2” x 4” Uplift 1/2” x 4” Uplift
Blade Tip Speed 12,397 fpm 14, 877 fpm 14,420 fpm
Blade Holder Round Round Round
Top Deck 10 Ga. Steel 10 Ga. Steel 10 Ga. Steel
Side Bands 1/4” x 8” 1/4” x 8” 1/4” x 8”
Minimum Tractor HP 30 40 50
Front & Rear Deflectors Belting is standard, chain deflectors are optional
Wheels Laminated Laminated Laminated
Approximate Weight (lbs.) 794 lbs.
1, 2 962 lbs. 1, 2 1247 lbs. 1, 3
1 - Weight includes deflector chains front & rear, 2 - Single tailwheel, 3 - Dual tailwheel
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Figure 1-1 Major Components
Support Yoke
Gearbox
Strongback
A-Frame
Strut
Skid
Front Belting
Driveline
Hitch Pin
7
Rear
Band
Flex
Link