Exmark Turf Tracer Operator's Manual page 24

POTENTIAL HAZARD
♦ Operating a mower deck with loose or weakened blade
bolts can be dangerous.
WHAT CAN HAPPEN
♦ A loose or weakened blade bolt could allow a blade
rotating at a high speed to come out from under the
deck, causing serious injury or property damage.
HOW TO AVOID THE HAZARD
♦ Replace the blade bolt after striking a foreign object.
(Use only Exmark replacement parts PN 103-0862 –
blade bolt and PN 103-0865 – spring disc washer).
♦ DO NOT lubricate the threads of the bolt or spindle
before assembly.
♦ Torque the blade bolt to 115-120 ft. lbs. (156-163 N-m)
BLADE BOLT INSTALLATION
(Serial Nos. 510,000 – 539,999)
For Serial Nos. 540,000 and Higher:
d) Re-install the blades (if they were removed) in the following order (See Figure 6):
1) Install bushing through blade with bushing flange on bottom (grass)
side of blade.
2) Install bushing/blade combo into spindle.
3) Install blade bolt and spring disc washer. Be sure the spring disc
washer cone is installed towards the bolt head. Place a block of wood
between front or rear baffles and the blade then torque the blade bolts
to 55-60 ft-lbs. (75-81 N-m).
CAUTION
FIGURE 5
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DO NOT USE WRENCH HERE.
FOR BLADE INSTALLATION MAINTAIN
140-145 ft-lbs. (190-197 N-m) ON THIS NUT