Bush Hog 280 manual Blade Holder ASSEMBLY, Removal and Installation, Slip Clutch Operational Check

5. PTO Driveline - Disconnect PTO driveline, pull

Figure 4-1 Lubrication

the two sections apart, apply thin coat of multi-

purpose grease to inside of outer (female) sec tion. Reassemble sections and install. Pull each section to be sure driveline and shields are securely connected. Make certain PTO shielding is in good condition.

6.Gearbox - Add EP80W-90 gear oil as necessary to bring oil level to check plug on side of housing.

(4) Before Each Use

(1) Before Each Use

(5) Before Each Use

(3) Before Each Use

(2) Before Each Use

(6) Before Each Use

To remove yoke shield, rotate the two fasteners to allow shield to slide back.

WARNING

THE CUTTER CAN FALL FROM HYDRAULIC SYSTEM FAILURE. TO AVOID SERIOUS INJURY OR DEATH, SECURELY SUPPORT CUTTER BEFORE WORKING UNDERNEATH.

4-3 BLADE HOLDER ASSEMBLY, REMOVAL AND INSTALLATION

A. Remove cotter pin and blade holder assembly retaining nut.

B. Wearing heavy gloves, grasp blade holder and pull off shaft. If stuck, align bolt with access hole in top of cutter deck. Using hammer and a piece of pipe, strike blade bar. Rotate pan ato other blade bolt and strike blade bar. Repeat until blade holder comes off. Care should be taken not to damage blade bolt threads.

TO INSTALL:

A. Place blade holder assembly, washer and retaining nut on lower shaf . Torque nut to 450 ft./lbs. (609.7 Nm) using a 1-1/2” socket.

B. Using a sledge hammer, strike the blade pan firmly on each end (on or near the head of the blade bolt) several times, alternating ends between blows. Retighten to 450 ft./lbs. (609.7 Nm).

C. Install cotter pin. It may be necessary to tighten nut slightly to install cotter pin.

4-4 BLADE REPLACEMENT (Figure 4-2)

It is not necessary to remove the complete blade holder assembly to replace the blades. Blade bolts are accessible through a hole in the top of the cutter deck. Always replace both blades on a spindle using two blades having the same weight. Use only gen- uine Bush Hog replacement parts.

A. Raise cutter and securely block in position.

Figure 4-2 Blade Nut Removal

1-11/16” Socket

B. Remove nuts from blade bolts using a 1-11/16” socket through the access hole in the deck.

C. Inspect blade bolt shoulder for wear. Replace if necessary.

D. Assemble new blades to blade holder using blade bolts, nuts and lockwashers. Tighten nuts to 450 ft./lbs. Strike blade bolt head with heavy ham- mer to seat, then retighten.

E. Check to be sure blades swing 360° freely.

If blades will not swing freely, remove, locate problem, and repair. Operating cutter when blades will not swing freely will cause excessive vibration, damaging implement.

4-5 SLIP CLUTCH OPERATIONAL CHECK

After implement had been stored for 30 days or more, perform the following operational check:

A. Loosen eight nuts retaining clutch springs 1/3 turn or until spring can be turned with fingers.

B. With tractor at idle speed, engage tractor PTO drive for 2-3 seconds. Clutch should slip without

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