Ariens 911086 - lm21, 911087 - lm21s User Manual

GB - 17

To remove drive belt:

1. Set the right rear wheel to its lowest 

cutting height, and the left rear wheel to 
the third cutting height. This position 
provides clearance between friction disc 
and drive sheave.

2. Remove belt from the idler, then the drive 

sheave, and finally, the engine pulley 
(Figure 10).

3. Pull belt through opening under mower 

pan and over blade.

4. Make sure the idler pulley turns and the 

idler arm moves freely.

5. Reinstall drive belt in reverse order. 

IMPORTANT: Be sure the belt seats in sheave 
and pulley grooves with the idler touching the 
back (flat) side of belt.

6. Adjust rear wheels to the same cutting 

height.

See Figure 11.

The wheel drive must start to engage when 
wheel drive control is between 1-1/2” and 2” 
(3.8 and 5 cm) away from the handlebar.

To check:

1. With engine off, select a slow speed.
2. Slowly pull unit backwards.
3. Slowly squeeze wheel drive control until 

wheels stop.

4. Measure the distance between the wheel 

drive control and handlebar at the 
handlebar indentation.

To adjust:

1. If the measurement is more than 2” 

(5cm), loosen the lower cable nut and 
then tighten the upper cable nut against 
the adjuster bracket.

2. If the measurement is less than 1-1/2” 

(3.8cm), loosen the upper cable nut and 
then tighten the lower nut against the 
adjuster bracket.

3. Recheck measurement with the slowest 

and fastest speeds selected.

4. Repeat adjustment until wheel drive 

control is properly adjusted.

IMPORTANT: If there is not enough thread 
length for proper adjustment, contact your 
Dealer for repairs before operating unit.

1. Blade
2. Bolt, Lock Washer & 

Flat Washer

3. Drive Belt
4. Idler
5. Drive Sheave
6. Engine Pulley

Figure 10

1

2

3

4

OM1250

6

5

1. Traction Cable
2. Handlebar Indentation
3. Cable Nuts
4. Wheel Drive Control

1-1/2" to 2"

2

4

3

1

OM0290

(3.8 to 5cm)

Figure 11