Bush Hog RDTH60 - Manual (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
12
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