Maintenance
Adjusting Pre-Load
1. Adjust the two lock screws on the nut so that
the nut will have some drag when turned on the
spindle.
2. Apply red locktite to spindle nut, tighten to 40
ft. lbs., then turn the spindle 3-4 turns.
3. Back off nut 1/4 turn. Tighten to 35 ft. lbs.
4. Tap the top of spindle nut around it’s perimeter
with small hammer to set the spindle nut threads.
Tighten lock screws. Tap again. Do this until the
lock screws will not tighten further.
5. Top off with grease.
6. Apply o ring to motor end of spindle housing.
7. Be sure to apply red locktite to motor housing
bolts.
8. With the motor in place, pump grease into the as-
sembly through the grease whip until the hous-
ing is filled. Including grease used for assem-
bly, the assembly should take 3 tubes of grease.
US Mower recommends High Quality NLGI#0 Lithi-
um Base. (Calcium Base Grease is useful for very
wet conditions.)
Spindle Housing Maintenance
Other than keeping the bearings well greased, the single most important factor
to longevity of the spindle assembly is bearing pre-load. Bearing pre-load must be
maintained. Pre-load is provided by the spindle nut at the top of the spindle. The
torque on this nut should be close to 40 ft. lbs. Pre-load may need adjustment af-
ter several hard ground strikes. A helicopter like noise, when the plane of the
deck is changed, is a clear indication of the need for pre-load adjustment. If in
doubt, manually examine pre-load.
Set deck in a vertical position and grip edges of the blade bar while alternately
pulling hard on one side and pushing hard on the other. If any play can be detected
pre-load adjustment is needed.
Assembling the spindle housing
(USE HEAT TO REMOVE SPINDLE NUT
)
If the spindle housing assembly must be reassembled the following steps can help
ensure the performance and longevity of the unit:
1. Clean the housing and spindle, removing all metal chips, paint, dirt, used grease
and other contaminants.
2. Place the spindle housing motor side up insert small cup and flip over, insert
large race. Be certain races are completely bedded.
3. Pack large bearing with NLGI#0 Lithium grease and insert. Clean off excess
grease after inserting.
4. Insert spacer with widest lip facing up, apply retaining compound to inner bear-
ing where spindle goes. then insert spindle seal with solid face outward.
5. Press cleaned spindle down into spindle housing.
6. Flip housing over and fill cavity with grease.
7. Grease and Press in small bearing. Use retaining compound on inner surface.
8. Apply locktite 243 to set screws and screw into Spindle Nut.
9. Apply locktite 262 to threads and hand thread spindle nut onto spindle. (nut is
left hand thread and only goes on one way. If it doesn’t thread on, flip over and
hand thread on again). Follow adjusting Pre-Load Instructions below
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