Exmark NAVIGATOR 4500-367 - Manual (Page 33)

Maintenance
Figure 19
1. To increase steering responsiveness hook
pump control sprints directly on anchor bolt.
To decrease steering responsiveness hook pump
control springs on anchor tabs as shown.
Tracking Adjustment
See Motion Control Linkage Adjustment section
PTO Drive Pulley Alignment
PTO drive pulley alignment is necessary for any of
the following conditions:
• The blower has been removed or replaced.
• The engine mounting bolts have been loosened
or the engine has been moved or replaced.
• The jackshaft mounting bolts have been loosened
or the jackshaft has been moved or replaced.
1. Stop engine, wait for all moving parts to stop, and
remove key. Engage parking brake.
2. Move the speed control lever to the neutral
position.
3. Disengage the PTO lever.
4. Remove fuel tank mounting nuts and swing out
fuel tank.
5. Verify that the blower is installed and secured
tightly.
6. Loosen the 4 engine mounting bolts.
7. Unhook the pump belt tension spring.
8. Loosen the 4 jackshaft mounting bolts.
9. Measuring from the blower pulley as a baseline,
move the engine and jackshaft until the rear
surface of all 3 pulleys are aligned within 1/32
inch to 1/16 inch (0.8-1.6 mm). Use a straight
edge to align all three surfaces (see Figure 20).
Figure 20
1. Align three pump drive
pulley surfaces shown
with this pattern within
1/32 inch to 1/16 inch
(0.8-1.6 mm). 2. Align three PTO 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 20).
4. Re-tighten pulley set screws and recheck
alignment.
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