Bush Hog RDTH 84 - 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 the spring
length should be set at 2-7/8”. (Figure 4-2).
To adjust the spring length, loosen or tighten the 1/2”
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
1/2” hex nuts on the spring adjustment rod.
C. Remove old belt.
D. Install new belt, referring to Figure 4-2. 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 length is 2-7/8”.
F. Replace right and left side shields.
4-3 BELT ADJUSTMENT
Figure 4-2 Belt Installation Diagram
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 center bolt securing blade and blade
bar to spindle. Blade and bar will come off as a unit.
Blade bar can then be removed from the blade.
D. Install new blade(s) as shown in Figure 4-3. Be
sure that blades are installed with offset in proper
direction. Tighten retaining bolts to 65 ft./lbs.
WEAR HEAVY WORK GLOVES TO PRO-
TECT HANDS FROM SHARP EDGES.
CAUTION
12
line and shields are securely connected. Make cer-
tain PTO shielding is in good condition.
40 HOURS
7. Spindle Assemblies - Apply 5 shots multi-pur-
pose grease with grease gun. Grease fittings for
spindles can be accessed through holes in the
shields.
Figure 4-3
Spindle Assy.
29” Blade
FRONT
Spring Idler
Blade Bar
1/2 x 1-3/4” Capscrew
1/2 x 1-1/2 UNF
G8 Capscrew
Safety Washer
Locknut
Bearing Washer
2-7/8”
1/2” Hex Nuts