Woods Equipment MDO80-2 manual Gearbox Assembly, Gearbox Adjustment, Blade Spindle Repair Figure

nicks or bumps. If damage cannot be repaired by resur- facing with emery cloth, replace damaged part.

Inspect housings for damage, paying specific attention where seals seat. Replace housing if damaged area cannot be resurfaced with emery cloth.

Gearbox Assembly

(Refer to illustration on page 45.)

Bearing cups, cones and sleeves are a press fit. Press new bearing cups into vertical and horizontal housings. Press bearing cones onto vertical and horizontal shafts until they seat against machined surface next to gears.

Insert shafts into their respective housings and press bearing cones onto shaft until all free play is removed (similar to adjusting front wheel bearings on an auto- mobile).

Check adjustment by spinning housing. It should turn freely. If bearings are too tight, hold housing and rap gear shaft with lead or brass hammer. Readjust bear- ings. Proper bearing adjustment is essential to good bearing life. Do not leave bearings adjusted too tight. Bearings should turn freely without any noticeable end play.

Place O-ring seal over shaft and seat against bearing.

Press sleeve on shaft and down against bearing, but do not move bearing. Check bearing adjustment again by spinning housing. Readjust if necessary.

Protect surfaces where seal seats and tack weld sleeve to shaft.

Seal Installation

An improperly installed seal will leak and could result in gearbox failure. Clean area in housing where outer diameter of seal seats and apply a thin coat of Perma- tex.

Lubricate seal lip, position spring toward housing, and carefully guide over sleeve and shaft, using a blunt tool such as a letter opener. Use care to prevent seal lip from rolling under. Do not use a knife blade as it will nick and ruin seal.

Select a piece of pipe or tubing with an OD that will set on outside edge of seal cage but will clear housing. A driver that is too small will bow cage and ruin seal.

Carefully press seal into housing, preventing distortion to metal seal cage. Seat seal firmly against housing.

Gearbox Adjustment

Place a 1/32" thick gasket between the vertical and horizontal housing and gearbox housing. Horizontal housing must be positioned so breather hole is at top when gearbox is on cutter. Snug bolts and check gear mesh by shining a flashlight into the oil fill hole. The

small ends of the teeth on both gears should be flush with each other and there should be some backlash.

If the gear teeth are not aligned, add gaskets under one of the gear housings until they do.

Use a feeler gauge to check for .020 backlash between the teeth. Adjust by adding or subtracting even num- bers of gaskets of the same thickness from each hous- ing and the gearbox.

When all of the bolts are tightened, check the backlash again to ensure it did not change. If it is changed, add or subtract gaskets as necessary to obtain .020 back- lash between the teeth.

BLADE SPINDLE REPAIR (FIGURE 11)

Remove blades from crossbar and belts from pulley. Remove split taper bushing from pulley and remove pulley from spindle. Remove spindle from cutter. Remove set screw and flanged nut (1) from spindle. Block under washer (9) and housing and press blade carrier and spindle shaft out of housing.

Assembly

Press new cups (6) into spindle housing, seating them against housing bore shoulder. Place bottom end of spindle housing (18) up. Set bearing cone and sleeve

(5) on cup.

Coat area of spindle housing where seal seats with Permatex. Press seal (4) (with spring-loaded lip toward the center) into housing, using care to prevent seal cage distortion.

Place washer (9) on spindle crossbar and shaft. Remove bearing cones from housing. Lubricate bottom seal, turn housing right side up and press down onto spindle shaft. Fill housing cavity with a lithium grease of #2 consistency with a MOLY (molybdenum disulfide) additive.

Place washer (7) over shaft and seat. Seat bearing cone and sleeve (5) on bearing cup. Adjust bearings by pressing on shaft until all free play is removed (similar to adjusting front wheel bearings on an automobile).

Check adjustment by spinning housing; it should turn freely. If bearings are too tight, hold housing and rap spindle shaft with a lead hammer. Readjust bearings. Proper bearing adjustment is essential to good bearing life. Do not leave bearing adjusted too tightly. Bearings should turn freely without any noticeable end play.

When the bearings are adjusted, coat area of spindle housing where seal seats with Permatex and press seal (4) (with spring-loaded lip up) into housing using care to prevent seal cage distortion.

When the bearings are adjusted, tighten nut against sleeve and bearing (5). Insert brass plug (2) into hole in nut then tighten set screw (3) against brass plug (2).

15916 (Rev. 5/11/2007) Dealer Service 23