Alamo GR72 User Manual

GR60/72   02/07

Operation Section 4-40

© 2007 Alamo Group Inc.

Not Cutting Clean

Blades dull.

Sharpen or replace Blades.

Blade rotation incorrect.

Use correct Blade for Carrier.

Using Straight Blades

Use Fan Blades in grass.

Carrier RPM too low.

Increase PTO speed.

Mower not leveled. 

Adjust machine level (in very heavy

weeds, 1/2” to 1” low in front).

Tires mashing down grass.

Use offset Adapter to move Mower to

the left.

Ground speed too fast.

Reduce ground speed.

Blades locked back.

Free blades.

Blades riding up due to Blade

Replace Blade Bolts.

Bolt wear.
Blades bent up.

Replace Blades.

Breaking Blade Bolts

Operating with loose Blade Bolts.

Tighten Blade Bolts to 300 ft./lbs.

(Left Hand Threads).

Worn Blade Bolt.

Replace Bolt.

Cutting Too High

Blades bent up.

Replace Blades.

Blade Bolt Bushing broken or 

Replace or reweld Bushing.  Weld with

loose.

E7018 low Hydrogen rods.

Blade Carrier bent.

Straighten or replace Blade Carrier.

Blades on upside down.

Turn Blades right side up and tighten.

Mower Vibrates

Blade locked back.

Loosen locked Blade.

Drivelines not phased.

Replace Driveline.

Blade broken.

Replace Blades in sets.

Blade Carrier bent.

Repair or replace Carrier.

Blade Hub not properly seated

Remove Hub, check Key and Shaft,

on Shaft.

and replace or seat properly.

New Blade matched with worn Blade. Replace Blades in sets.

Mower Windrowing

Cutting heavy material.

Raise Mower and reduce ground

speed.