Bush Hog RDTH SERIES RDTH 60 Operator's Manual download pdf (Page 14)

Belt tension should be checked every 40 hours to

get maximum life from drive belt and best perfor-

mance from cutter. Belt tension is adjusted by

increasing or decreasing the length of the spring on

the moveable idler. For proper belt tension on the

60” mowers, the spring length should be set at 6-

5/8”. For proper belt tension on the 72” mowers, the

spring length should be set at 7-7/8”. (Figure 4-2).

To adjust the spring length, loosen or tighten the 3/8”

hex nuts on the spring adjustment rod until the cor-

rect spring length is reached.Use only genuine Bush

Hog replacement parts.

4-4 BELT REPLACEMENT

A. Remove right and left side shields.

B. Relieve spring tension by loosening the two

3/8” hex nuts on the spring adjustment rod.

C. Remove old belt.

D. Install new belt, referring to FIGURE 4-2. (Also

refer to the decal on the mower deck) Be sure that

the belt is properly positioned in all sheave grooves.

E. Adjust tension on the belt by adjusting the

length of the spring on the moveable idler. The cor-

rect spring lengths are 6-5/8” and 7-7/8” for the 60”

and 72” mowers respectively.

F. Replace right and left side shields.

4-3 BELT ADJUSTMENT

Figure 4-2 Belt Diagram

Spring Idler

4-5 BLADE REPLACEMENT

A. Raise cutter using tractor hydraulics and

SECURELY BLOCK INTO POSITION.

B. Set parking brake, turn off tractor and remove

key

C. Remove bolt and cup washer securing blade to

spindle. Remove blade.

D. Install new blade(s) as shown in Figure 4-3

with concave side of cup washer against blade. Be

sure that blades are installed with offset in proper

direction. Tighten retaining bolts to 76 ft./lbs.

WEAR HEAVY WORK GLOVES TO PRO-

TECT HANDS FROM SHARP EDGES.

CAUTION

7. Spindle Assembly - Apply 5 shots multi-purpose

grease with grease gun. Grease fittings for spindles

should be accessed by removing the plastic plugs in

the shields. After completing lubrication, replace

plastic plugs.

Figure 4-3

Spindle Assy.

Blade Washer

Blade

Cup Washer

Blade Bolt

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Bush Hog RDTH SERIES RDTH 60 Operator's Manual Page 14

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