Bush Hog RTH 4-3BLADE REPLACEMENT, 4-4SL IP CLUTC H OPERATIONA L CHECK, 4-5SLIP CLUTCH ADJUSTMENT

4-3 BLADE REPLACEMENT

WARNING

	THE TIL LER C	AN FALL FRO		M
	HYDRAULI C SYSTEM FAI		LURE. TO
	AVOID SE RIOUS INJURY OR DEATH			,
	SECURELY SUPPORT TILLER BEFO RE
	WORKING UNDERNEATH.
Tiller blades should be		replaced when they have
approx imately 1/4” of wear			le ft on t	ip of

blade.(Figure 4-2) To replace blades, remove bolts securing blade. I nstall new b lade in its place. Blade must b e a ri ght or left corresponding to the blade removed. Tighten b lade bolts to 118 f t. lbs. Use only genuine Bush Hog replacement parts.

The RTN, RTNR and RTH are designed to accomo- date up to 6 blades per flange if desired.

4-4 SL IP CLUTC H OPERATIONA L CHECK

(IMPORTANT: Also refer to page 17)

After tiller has been stored for 30 days or more, perform the following operational check:

A. Loosen eight nu ts retaining cl utch spri ngs exactly one full turn.

B. With tiller blades firmly on ground and tractor at idle speed, engage tractor PTO drive for 2-3 sec- onds. Clut ch should slip without t urning blades. If clutch does not s lip, contac t your authorized B ush Hog dealer.

C. Retighten nuts to within 1/64” oforiginalposition. Initial spring length is1-3/32”(27.6mm).(Figure 4-3)

CAUTION

FAILURE TO RETI GHTEN S PRING NUTS TO ORIG INAL POSITION M AY CA USE DAMAGE TO TIL LER A ND/OR TRACTOR DUE TO I MPRO PE R SLIP CLUTCH TORQUE SETTING.

4-5 SLIP CLUTCH ADJUSTMENT

(IMPORTANT: Also refer to page 17)

The slip clutch is fact ory preset to the correct torque

for pro tecting implement and tractor. Perio dic

adjustment is r ecommended; refer to Section 4-4.

Should adjustment be needed, fi rst check to be sure all spring lengths are w ithin 1/64” of being the same. Initial spring length is 1-3 /32” (27.6mm) show n in Figure 4-3. I f necessary, l oosen nut on any spring that is unequal. Adjust al l eight spring re taining nuts 2/3 of a turn (2 flat s on a nut) and check clutch slip- page. If further adjustment is necessary, do so in 1/3 turn inc rements or c onsult y our Bus h Ho g dealer. Adjust only to provide sufficient torque to prevent slip- page unde r n ormal condition s. When rocks, roots, etc. are present, occasional slippage is normal for dri- vetrain protection.

Figure 4-2 Blade Wear

1/4”

Figure 4-3	1-3/32”
	(27.6mm)
Clutch Spring Length

4-6 RTN CHAIN ADJUSTMENT(Figure 4-4)

A. Turn tr actor off and set par king brake before making chain adjustment.

B. Block up tiller by placing wooded block under- neath the skids.

WARNING

THE TILLER CAN FALL FROM HYDRAULIC SYSTEM FAILURE. TO AVOID SERIOUS INJURY OR DEATH, SECURELY SUPPOR T TI LLER BEFORE WORKING UNDERNEATH

C. The drive chain on the Model RTN, RTNR ti ller is preset with the correct chain t ension when it leaves the fa ctory. Af ter a n exte nded per iod of us e the chain will w ear and i t will b e nece ssary to make adjustment to the chain through the chain adjusting bolt located on the outside of the chain case.

D. Measure the initial length of the ch ain tension fastener before beginning. Rotate t he bolt clockwise to t ighten t he c hain t ension bolt to remove excess motion of th e chain. Only s mall increments o f bolt turns should be made, then li sten for the amount of lost motion in the chain. To much chain ten sion and the rotor will be difficult to rotate.

DO NOT OVERTIGHTEN THE CHAIN TENSIONER. PREMATURE FAILURE CAN OCCUR TO T HE CHAIN OR BEARING IF OVERTIGHTENED.

		RTN Chain Tensioner Bar
	Figure 4-4
	Chain Adjustment
	Adjusting Bolt
Bears On This Pad

NOTE:

RTNR Tensioner Bar

And Adjusting Bolt Are

Located On Opposite

Side Of Chain Case

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