Exmark FMD524 manual For Serial Nos ,000 539,999, Blade Bolt Installation

5.1.4Check mower blades.

Service Interval: Daily

a)Stop engine, wait for all moving parts to stop, and remove key.

b)Lift deck and secure in raised position as stated in Section 5.1.3.

c)Inspect blades and sharpen or replace as required.

For Serial Nos. 510,000 – 539,999:

d)Re-install the blades (if they were removed) by placing a block of wood between the front or rear baffles and the blade then torquing the blade bolts to 115-120 ft. lbs. (156-163 N-m). Be sure the spring disk washer cone is installed toward the bolt head. See Figure 5.

CAUTION

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)

DO NOT USE WRENCH HERE.

FOR BLADE INSTALLATION MAINTAIN 140-145 ft-lbs. (190-197 N-m) ON THIS NUT

FIGURE 5

BLADE BOLT INSTALLATION

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).

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