Bush Hog 280 manual SEMI-MOUNT Model, Quick Hitch Model

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 Section4-6.

WARNING

OVER-TIGHTENING SPRING NUTS MAY CAUSE DAMAGE TO IMPLEMENT AND / OR TRACTOR DUE TO INCOR-

RECT SLIP CLUTCH TORQUE

SETTING. ALWAYS FOLLOW THE 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.

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.

IPlace 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.

WARNING

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.

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