Installing The Mower; Adjusting The Blade Drive Belt; Adjusting The Height Adjustment Cable Rod Assembly - Toro 74590 Operator's Manual

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Figure 39
1. Idler pulley and idler arm
assembly
2. V–belt
3. Engagement spring
4. Rear hairpin clips
5. Rear pins
6. Remove the hairpin clips from the two rear pins and
remove the pins (Fig. 39). A pliers may be needed to
pull the second pin out.
7. Remove the hairpin clip from the front pin and remove
the pin (Fig. 39).
8. Remove the V–belt from the engine pulley (Fig. 39).
9. Slide the mower out from beneath the tractor.

Installing the Mower

Reverse the procedure for Removing the Mower, page 30.

Adjusting the Blade Drive Belt

Adjust the blade drive belt after the first 20 operating hours
and every 50 operating hours thereafter.
1. Remove the mower; refer to Removing the Mower,
page 30.
Note: It is not possible to adjust the blade drive belt
correctly without removing the mower.
2. Remove the V–belt pulley and idler arm assembly
(Fig. 39).
3. Remove the belt cover.
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6. Front hairpin clips
7. Front pin
8. Engine pulley
9. V-belt pulley
10. Front suspension M12
nuts
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4. Loosen the two hex nuts on the idler pulley (Fig. 40).
5. Adjust the M10 nut until the belt flexes 5 mm with 3 kp
of force (Fig. 40).
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Figure 40
Top View
1. Hex nuts
2. Mower belt
6. Tighten the two hex nuts on the idler pulley.
7. Reinstall the mower; refer to Installing the Mower,
page 31.
Adjusting the Height
Adjustment Cable Rod
Assembly
Check the front-to-rear blade slope every 100 hours, yearly,
or any time you install the mower. Before you check the
slope, set the air pressure in the front and rear tires to the
recommended inflation; refer to Tire Pressure, page 22. If
the front of the mower is not within a range of
3.5–10.5 mm (1/8–3/8 in.) lower than the rear of the
mower, adjust the blade slope using the following
instructions:
1. Park the machine on a level surface, disengage the PTO,
set the parking brake, stop the engine, and remove the
ignition key. Pull the wire off the spark plug(s).
2. Move the lower pin of the front adjustment suspension
into the bottom position of the slotted holes by
adjusting the 2 nuts (M12) on the front suspension
(Fig. 39).
3. Move the height-of-cut lever to position 1. The front
mower gauge wheels must rest on the ground.
4. Adjust the M8 locknut at the end of the height
adjustment rod assembly until the rod is slightly taut
(Fig. 41).
3. M10 nut