Exmark 4500-645 manual Pump Drive Belt Tension

Maintenance

		Figure 29
1.	Adjuster link	3. Adjuster
2.	Jam nut

For LZAS-LP Units: Loosen the whizlock nut on the side of the yoke and the jam nut on top. Fine tune the screw adjuster by turning it to get 3 inch (7.6 mm) height (see Figure 30).

To increase the height, turn the adjuster screw clockwise; to decrease, turn counterclockwise.

		Figure 30
1.	Whizlock nut	3.	Jam nut
2.	Adjuster screw	4.	Yoke

11.The back tips of the side blades should measure 3 1/4 inches (8.3 cm). Fine tune rear adjusters as required.

12.Re-measure until all four sides are the correct height. Tighten all the nuts on the deck lift arm assemblies.

13.Lower discharge deflector.

14.If the four deck links do not have enough adjustment to achieve accurate cut height with the desired rake, the single point adjustment can be utilized to gain more adjustment (see Figure 31).

Figure 31

1.Single point height adjustment bolt

2.Front height-of-cut plate mounting bolt

3.Rear height-of-cut plate mounting bolt

15.To adjust the single point system, first loosen the front and rear height-of-cut plate mounting bolts.

16.If the deck is too low, tighten the single point adjustment bolt by rotating it clockwise. If the deck is too high, loosen the single point adjustment bolt by rotating it counterclockwise.

Note: Loosen or tighten the single point adjustment bolt enough to move the height-of-cut plate mounting bolts at least 1/3 the length of the available travel in their slots. This will regain some up and down adjustment on each of the four deck links.

17.Re-tighten front and rear height-of-cut plate mounting bolts.

Important: Torque the front and rear height-of-cut plate mounting bolts to 27-33 ft-lb (37-45 N-m).

18.Repeat steps 9 through 13.

Pump Drive Belt Tension

Self-tensioning - No adjustment necessary.

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