Exmark 4500-370 Check for Loose Hardware, Check Tire Pressures, Change Gearbox Oil, Maintenance

Maintenance

Note: Blade driver flats must be aligned with the flats on the shaft when installing blade on the mower deck.

6.Lower the mower deck to the operation position (see section Lowering the Mower Deck to the Operation Position).

WARNING

Operating a mower deck with loose or weakened blade bolts can be dangerous. 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.

•Replace the blade bolt after striking a foreign object.

•Use only genuine Exmark replacement parts.

•Do Not lubricate the threads of the bolt or spindle before assembly.

•Torque the blade bolt to 85-110 ft-lb (115-149 N-m).

•Torque the shear bolts to 80-100 in-lb (922-1130 N-cm).

Check for Loose Hardware

Service Interval: Before each use or daily

1.Stop engine, wait for all moving parts to stop, and remove key. Engage parking brake.

2.Visually inspect machine for any loose hardware or any other possible problem. Tighten hardware or correct the problem before operating.

Check Tire Pressures

Service Interval: Every 40 hours

The front caster tires are semi-pneumatic and Do Not need to be inflated.

Note: Do Not add any type of tire liner or foam fill material to the tires. Excessive loads created by foam filled tires may cause failures to the hydro drive system, frame, and other components. Foam filling tires will void the warranty.

Change Gearbox Oil

Service Interval: After the first 50 hours

Every 100 hours thereafter

1.Stop engine, wait for all moving parts to stop, and remove key. Engage parking brake.

2.Place unit on a level surface.

3.Remove the gearbox and drive shaft assembly from the mower deck. Retain hardware for re-use.

4.Remove the large oil drain plug on the front of each of the three gearbox sections and drain oil (Figure 13).

Figure 12

1.1/2-20 x 2 1/4 blade bolt— torque to 85-110 ft-lb (115-149 N-m).

2.Washer

3.Shear bolts—torque to 80–100 in-lb (922-1130 N-cm)

4.Blade driver

5.1/4-20 nyloc nuts

Figure 13

1.	Small magnetic plugs	3. Small magnetic plug
	(front and back)	(front only)
2.	Large oil drain/fill plug

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