Belt Guide Adjustment; Adjust Safety Switch; Brake Adjustment - Exmark NAVIGATOR NV640KC Operator's Manual

Maintenance
Figure 11
1. Pump Drive Belt
2. Pump
3. Idler
5. Reinstall PTO Belts as stated in the PTO Belt
Replacement section

Belt Guide Adjustment

1. Stop engine, wait for all moving parts to stop, and
remove key. Engage parking brake.
2. Engage PTO lever.
3. Adjust belt guides as shown in Figure 12.
Figure 12
1. 1/8 inch (3 mm)
2. 7/16 inch (11 mm)
3. 1/8 inch (3 mm)
Clearance
4. Pump
5. Idler
6. Engine
4. Rotate wireform guide to
center belts in guide.
5. 1/4 inch (6 mm)
6. 5/16 inch (8 mm)

Adjust Safety Switch

Adjust all safety switches so plunger extends 3/16
inch to 1/4 inch (4.8 mm-6.4 mm) from switch body
when plunger is compressed (see Figure 13).
1. 3/16 inch to 1/4 inch (4.8 mm-6.4 mm)

Brake Adjustment

Check to make sure each brake is adjusted properly.
1. Pull the brake lever up and back to the engaged
position.
2. A gap must exist between the bottom of the brake
bolt head and the top surface of the brake swivel
as shown in Figure 14. If a gap does not exist,
adjust the linkage to a maximum gap of 1/2 inch
±1/8 inch (1.3 cm ±0.33 cm) as shown.
Brake Adjustment for Each Side (Separately)
1. Brake Lever in engaged
position
2. Loosen nut here
3. 1/2 inch ±1/8 inch (1.3
cm ±0.33 cm)
32
Figure 13
Figure 14
4. Brake Bolt
5. Brake Swivel