Exmark 000 & higher, 920 manual Pump Drive Belt Tension, Deck Belt Tension

Maintenance

the chain bolts in the deck lift arms making sure they don’t move while tightening.

9.Loosen the four nuts which secure the front swivels (two per side) until the front chains are loose and front of deck is supported by the 3/4 inch (19 mm) block. Do Not loosen the front chain hardware.

10.On left side, adjust front swivel using the locking nut behind the swivel until the front chain is tight and all slack is removed from linkage. Do Not lift front of deck off 3/4 inch (19 mm) block. Secure front swivel using locking nut in front of swivel.

Repeat for right side.

11.Recheck that the 3/4 inch (19 mm) blocks fit just snugly under the brackets and that the tension on all the chains is approximately equal. Make sure all chain attachment bolts are tight. Reposition anti-scalp rollers and tighten securely.

Figure 17

1.Apply downward pressure here

2.Place locking pliers here to hold spring

3.13–1/2 inches (34.3 cm) for cut heights at 2 inches or above or 14 inches (35.6 cm) for cut heights below 2 inches

4.Remove force on deck springs by loosening nuts here

5.Swivel

6.Front of unit

7.Socket head adjusting screw

8.Jam nut

12.Raise deck lift lever to the 5 inch (12.7 cm) cutting height position (Figure 9). Adjust spring compression until proper distance is obtained between the two large washers (Figure 17). Adjustment is made by turning the nut at the front of each spring (clockwise will shorten the spring, counterclockwise will lengthen the spring). Lock in position with jam nuts.

Note: When above adjustments have been made, the front of the deck will be slightly lower than the rear of the deck.

Pump Drive Belt Tension

Self-tensioning - No adjustment necessary.

Deck Belt Tension

Self-tensioning - No adjustment necessary.

Mule Drive Belt Tension Adjustment

Self-tensioning idler, adjust as follows:

1.Stop engine, wait for all moving parts to stop, and remove key. Engage parking brake.

2.Check to make sure the center of the bolt head in the center of the spring loaded pulley, on left side engine deck support, is positioned between the centers of the two alignment holes in the left support plate (Figure 18 and Figure 19). It is necessary to adjust the belt tension when the center of the bolt head is at or below the center of the bottom alignment hole.

3.When adjustment is necessary, loosen the idler pulley on the right-hand side so it can move up and down in the slot.

Place a wrench on the 3/8 inch nut in the center of the spring loaded pulley and apply upward pressure to relieve tension on the spring (a 1/2 inch drive breaker bar and 9/16 inch socket works best).

Reposition the adjusting pulley to the bottom of the slot.

Note: When installing a new belt, it is necessary to reposition the right adjusting pulley upward in the slot in order to position the center of the spring loaded pulley between the alignment holes.

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