Bush Hog 965H Operator's Manual download pdf (Page 12)

Figure 4-3 Shear Bolt Blade Bolt

A. Raise cutter and SECURELY BLOCK IN

POSITION.

B. Remove nuts from blade bolts using a 1-5/16”

socket. Remove blades, bolts and washers.

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

420 ft./lbs. (569 Nm) It may be necessary to hold

blade bolt with pipe wrench. Strike head of bolt sev-

eral times with a hammer, 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, damag-

ing implement.

4-4 SHEAR BOLT REPLACEMENT

A. Refer to Figure 4 and slide yoke shield back.

B. Remove sheared bolt from input shaft using

hammer and punch.

C. Inspect retaining clip to make certain it is

securely installed in groove.

4-3 BLADE REPLACEMENT

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. To maintain proper balance always replace

both blades on a blade holder using two blades hav-

ing the same weight. Use only genuine Bush Hog

replacement blades. (Figure 4-3)

WARNING

DO NOT GET UNDER CUTTER UNLESS IT

IS SECURELY BLOCKED IN POSITION.

ACCIDENTAL FALL COULD CAUSE SERI-

OUS INJURY OR DEATH.

WARNING

FAILURE TO USE CORRECT SIZE SHEAR

BOLT MAY CAUSE PERSONAL INJURY OR

DEATH.

WARNING

FAILURE TO INSTALL RETAINING CLIP

WILL ALLOW DRIVELINE TO SWING

FREELY IF BOLT IS SHEARED CAUSING

POSSIBLE INJURY OR DEATH.

D. Install new 1/2 x 3” Grade 2 shear bolt and lock-

nut. Refer to torque chart on page 15.

E. Lock yoke shield securely into place.

4-5 BLADE HOLDER & GEARBOX

REMOVAL

A. Raise cutter using tractor 3-point lift. Turn off

tractor engine.

B. BLOCK CUTTER SECURELY INTO POSITION.

C. Remove cotter pin and blade holder retaining

nut. Wear heavy work gloves to protect hands from

sharp edges.

D. Grasp blade holder and pull off shaft. If neces-

sary, align blade bar with access hole in top of deck

and drive off with hammer and pipe. Care should be

taken not to damage threads on blade bolt.

E. Press all three tabs and slide yoke shield back.

(Figure 4-2)

F. Remove shear bolt and retaining clip. Slide yoke

off gearbox input shaft. (Figure 4-3)

G. Remove nuts securing gearbox to deck.

Remove gearbox.

4-6 BLADE HOLDER AND GEARBOX

INSTALLATION

A. Raise cutter using tractor 3-point lift. Turn off

tractor engine.

B. BLOCK CUTTER SECURELY INTO POSITION.

C. Attach gearbox to cutter deck using bolts and

flange nuts.

D. Install blade holder onto gearbox securing with

castellated nut and flat washer. Torque nut to 350

ft./lbs. (475 Nm). Wear heavy work gloves to protect

hands from sharp edges.

WARNING

DO NOT GET UNDER CUTTER UNLESS IT

IS SECURELY BLOCKED IN POSITION.

ACCIDENTAL FALL COULD CAUSE SERI-

OUS INJURY OR DEATH.

WARNING

DO NOT GET UNDER CUTTER UNLESS IT IS

SECURELY BLOCKED IN POSITION. ACCI-

DENTAL FALL COULD CAUSE SERIOUS

INJURY OR DEATH.

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Bush Hog 965H Operator's Manual Page 12

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