Inspect gear shafts and sleeves. Pay specific attention to areas where seals seat. Check for cracks, grooves, 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
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 Permatex.
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
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, see Figure 11. 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, see Figure 11.
Place bottom end of spindle housing (18) up. Set bear- ing cone and sleeve (5) on cup.
Coat area of spindle housing where seal seats with Permatex. Press seal (4) (with
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 consis- tency with a MOLY (molybdenum disulfide) additive.
Place washer (7) over shaft and seat. Seat bearing cone and sleeve (5) on bearing cup, see Figure 11.
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.
15914 (Rev. 5/11/2007) | Dealer Service 23 |
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