Exmark NAVIGATOR 4500-367 - Manual (Page 34)

Maintenance
Rear Caster Pivot Bearings
Pre-Load Adjustment
Remove dust cap from caster and tighten nyloc
nut until washers are flat. Back off 1/4 of a turn
to properly set the pre-load on the bearings. If
disassembled, make sure the spring disc washers are
reinstalled as shown in Figure 21.
Figure 21
1. Spring disc washers
Hopper Door Adjustment
Door Closing:
Loosen six door hinge nuts (see Figure 22).
Open door and place a 3/8 inch rubber strip or 3/8
inch diameter hose between the hopper and hopper
door (see Figure 22).
Close door and push tight against hopper.
Tighten hinge hardware. Open hopper door and
remove rubber strip.
Figure 22
1. Loosen door hinge
nuts-three per side 2. Place a piece of 3/8 inch
(9.5 mm) rubber on this
surface
PTO Brake Spring
Adjustment
PTO brake spring adjustment is only necessary if the
blower has been removed or replaced or if the PTO
drive idler arm has been disassembled.
1. Stop engine, wait for all moving parts to stop, and
remove key. Engage parking brake.
2. Locate the brake spring and thread the two jam
nuts out to the end of the brake spring rod (see
Figure 23).
3. Tighten jam nuts together at end of brake spring
rod.
Figure 23
1. Tighten jam nuts here
2. PTO Brake spring assembly
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