Drive Chain Maintenance; Checking And Adjusting The Drive Chain - Toro MM E-S Series Operator's Manual

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Figure 41
1. Motor pulley
2. Idler pulley
3. Straightedge
Note: Both pulleys must be aligned flush with the
straightedge.
3. If the pulleys are not aligned do the following:
A. Move the clutch lever to the Off position.
B. Loosen the locknuts and setscrews that secure the
idler pulley to the idler shaft (Figure 41).
C. Using a soft-face mallet, tap the idler pulley
forward or backward along the idler shaft until
the motor pulley and the idler pulley are aligned
to the straightedge (Figure 41).
D. Tighten the setscrews and locknuts that secure the
idler pulley to the idler shaft (Figure 41).
4. Install the divider plate; refer to Installing the Divider
Plate (page 23).
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4. Idler shaft
5. Locknut
6. Setscrew

Drive Chain Maintenance

Checking and Adjusting the
Drive Chain
Service Interval: After the first 10 hours
Every 50 hours
The drive chain should have 5 to 10 mm (7/32 to 13/32 inch)
of flex when applying 6.8 kg (15 lb) of pressure at mid-span.
Checking the Drive-chain Tension
1. Remove the divider plate; refer to Removing the
Divider Plate (page 22).
2. Place a straightedge along the chain from 1 sprocket
to the other (Figure 42).
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1. Flex of 5 to 10 mm (7/32 to 13/32 inch)
3. With your finger, push on the chain with 6.8 kg (15 lb)
of pressure, midway between the sprockets (Figure 42).
4. Measure the distance from the chain to the straightedge;
the distance should be 5 to 10 mm (7/32 to 13/32
inch).
Note: If the chain tension needs adjustment, refer to
Adjusting the Drive-chain Tension (page 28).
5. Install the divider plate; refer to Installing the Divider
Plate (page 23).
Adjusting the Drive-chain Tension
Note: Adjusting the tension of the drive chain affects the
tension of the belts; adjust the belt tension after adjusting
the drive-chain tension.
1. Remove the divider plate; refer to Removing the
Divider Plate (page 22).
2. Loosen the nuts and bolts that secure the pillow-block
bearings for the idler pulley (Figure 43).
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Figure 42
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