Pump Drive Pulley Alignment; Rear Caster Pivot Bearings Pre-Load Adjustment; Hopper Door Adjustment - Exmark NAVIGATOR NV640KC Operator's Manual

Maintenance
inch to 1/16 inch (0.8-1.6 mm). Use a straight
edge to align all three surfaces (see Figure 21).
Figure 21
1. Align three pump drive
pulley surfaces shown
with this pattern within
1/32 inch to 1/16 inch
(0.8-1.6 mm).
10. Tighten the four engine mounting bolts and four
jackshaft mounting bolts. Check alignment after
tightening.
11. Re-install pump belt tension spring.
12. Swing fuel tank in and re-install tank mounting
nuts.
13. Complete the Pump Drive Pulley Alignment
section.

Pump Drive Pulley Alignment

Pump drive pulley alignment is necessary for any of
the following conditions:
• The engine mounting bolts have been loosened or
the engine has been moved or replaced.
• The pump pulleys have been loosened, moved,
or replaced.
• The PTO pulley alignment has been performed
(see PTO Drive Pulley Alignment section).
1. Stop engine, wait for all moving parts to stop, and
remove key. Engage parking brake.
2. Loosen set screws on both pump pulleys.
3. Using a straight edge, align each pump pulley with
the engine pulley by sliding along the pump shaft
(see Figure 21).
4. Re-tighten pulley set screws and recheck
alignment.
2. Align three PTO drive
pulley surfaces shown
with this pattern within
1/32 inch to 1/16 inch
(0.8-1.6 mm).
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 22.
1. Spring disc washers

Hopper Door Adjustment

Door Closing:
Loosen six door hinge nuts (see Figure 23).
Open door and place a 3/8 inch rubber strip or 3/8
inch diameter hose between the hopper and hopper
door (see Figure 23).
Close door and push tight against hopper.
Tighten hinge hardware. Open hopper door and
remove rubber strip.
36
Figure 22