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GB - 20
Cut is poor
1. Worn blade.
2. Too much grass is being
removed per cutting.
3. Grass is too wet.
4. Mowing speed is too fast.
1. Check blade (See
Maintenance).
2. Raise cutting height.
3. Allow grass to dry.
4. Mow slower.
Grass does not
disperse
evenly
1. Too much grass is being
removed per cutting.
2. Grass is too wet.
3. Mowing speed is too fast.
1. Raise cutting height.
2. Allow grass to dry.
3. Mow slower.
Mower does
not bag
clippings
1. Grass bag is overfilled.
2. Mulching plug is installed.
1. Empty grass bag and do not
allow it to overfill.
2. Remove mulching plug.
Wheel drive
does not
engage.
1. Wheel drive control not
engaged.
2. Drive belt out of position.
3. Drive belt worn or damaged.
4. Rear wheels in different cutting
heights.
5. Idler spring detached.
6. Wheel drive control cable
detached or broken.
7. Friction disc not adjusted
properly or damaged.
8. Bearings damaged.
9. Debris in gear set.
1. Engage wheel drive control.
2. Check drive belt. Adjust as
necessary (See Service and
Adjustments).
3. Replace belt (See Service
and Adjustments).
4. Adjust rear wheels to same
cutting height (See
Operation).
5. Attach idler spring to notch on
idler arm. Contact your
Dealer.
6. Check wheel drive control
cable. Adjust or replace as
needed. See Service and
Adjustments.
7. Contact your Dealer.
8. Contact your Dealer.
9. Contact your Dealer.
PROBLEM PROBABLE CAUSE CORRECTION
SERVICE PARTS
Always use genuine Gravely parts to keep
your mower running like new.
Mower Model 911530
Air Filter 21535600
Oil Filter 08266101
Spark Plug 21534100
Blade 01137000 (Standard)
01182400 (Tungsten)
Drive Belt 07217100
Friction Disc 03240700
ACCESSORIES
See your authorized Gravely dealer to add
these optional accessories.
71102400 Dethatcher
71102700 Mulchmaster Plug
71103000 Grass Bag
71103200 Rear Discharge Chute
71103500 Mulchmaster Mulching Kit
71103700 Leaf Shredder
71103900 Straight Axle Kit
71104100 Front Swivel Wheel Kit