Exmark Lazer Z Operator's Manual page 40

c) Lubricate front caster pivots once a year. Remove hex plug and cap.
Thread grease zerk in hole and pump with grease until it oozes out around
top bearing. Remove grease zerk and thread plug back in. Place cap
back on.
5.1.17 Lubricate caster wheel hubs:
Service Interval: Once Yearly
a) Stop engine, wait for all moving parts to stop, and remove key.
b) Remove caster wheel from caster forks.
c) Identify the caster assembly. Two different caster wheel assembly versions
have been used on the unit. Reference Figure 7 to determine if caster
wheel assembly "A" or "B" is installed on the unit.
For units with caster wheel assembly version "A" (round spacers):
a) Disassemble the caster wheels, pry out seals, and inspect bearings for
wear or damage and replace if necessary.
b) Pack the bearings with NGLI grade #2 multi-purpose gun grease.
c) Insert (1) bearing, (1) new seal, and (1) bearing spacer.
NOTE: Seals (Exmark PN 103-0063) must be replaced.
d) Insert Caster Spacer.
e) With open end of wheel up, fill area inside wheel around caster spacer with
NGLI grade #2 multi-purpose gun grease.
f) Insert the second (1) bearing, (1) new seal, and (1) bearing spacer.
g) Put wheel and tire assembly on the unit and adjust by tightening the nyloc
nut until wheel will not turn freely. Back nut off 1/6 of a turn so the wheel
will just turn with a slight amount of drag.
IMPORTANT: To prevent seal and bearing damage, check the bearing
adjustment often. Spin the caster tire. The tire should not spin freely
(more than 1 or 2 revolutions) or have any side play. If the wheel spins
freely adjust per step g).
For units with caster wheel assembly version "B" (end cap and spacer nut with
wrench flats):
a) Remove seal guards from the wheel hub.
b) Remove one of the spacer nuts from the axle assembly in the caster wheel.
Note that thread locking adhesive has been applied to lock the spacer nuts
to the axle. Remove the axle (with the other spacer nut still assembled to
it) from the wheel assembly.
c) Pry out seals, and inspect bearings for wear or damage and replace if
necessary.
FIGURE 7
CASTER WHEEL ASSEMBLY
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