Exmark FR524 Operator's & Parts Manual page 19

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4.3.3 Caster pivot bearings pre-load adjustment:
a) Remove dust cap from caster and tighten nyloc
nut until washers are flat. Back the nyloc off 1/4
of a turn to properly set the pre-load on the
bearings.
Note: If disassembled, make sure the spring
washers are reinstalled as shown in Figure 16.
the deck chain screws up and down to correct the cut heights measured above.
Tighten the chain bolts in the deck lift arms making sure they don't move while
tightening.
Recheck the cut heights and that the tension on all the chains is approximately
equal. Make sure all chain attachment bolts are tight. Remove the 4 socket
head screws and return back to the literature bag.
FIGURE 15
14
FIGURE 16