John Deere

GM20 Series Rear Discharge Grooming Mowers

Manufacturer: John Deere
Model: GM20 Series Rear Discharge Grooming Mowers

Maintain a clean and level look with efficient Grooming Mowers. Designed to give a smooth cut on lawns, sporting fields and golf courses.

  • 4 – 9 ft. (1.2 – 2.8 m) cutting widths
  • Single- or dual-belt drive
  • High blade speed for thorough cutting and uniform distribution
  • Cat. 1 iMatch compatible with kit

Choose from various cutting blades

Three blades per deck
Three blades per deck
#

To meet specific mowing needs, choose from two blade types:

  • Low lift
  • High lift (standard)

iMatch™ quick-hitch conversion kits for grooming mowers

iMatch quick-hitch
iMatch quick-hitch

The GM10, GM10E, and GM20 Grooming Mowers are only compatible with iMatch using a kit (code 9630).

Mulching kits for grooming mowers

Kit includes baffles, blades, and guard supports
Kit includes baffles, blades, and guard supports
#

A mulching kit is available as an attachment for field conversion. The mulching kit includes unique mulching blades, baffles, and guard supports to produce smaller clippings, which decompose faster than clippings that haven’t been mulched.

 

Operators should follow the one-third rule for cutting height when mulching in grass.

 

This mulching kit also does an excellent job when mulching leaves.

Gearbox with spiral gears

Highly engineered and rugged for extra strength
Highly engineered and rugged for extra strength
Gearbox cutaway
Gearbox cutaway

The rugged gearbox on the GM20 Series Standard-Duty Grooming Mowers feature highly engineered spiral gears to dramatically reduce noise, increase endurance, and transfer more power to the cutting blades.

Safety chain shield

Standard chain shield for added safety
Standard chain shield for added safety

GM20 Series Grooming Mowers come standard with a safety chain shield.

Anti-scalping roller conversion kits for GM10E, GM11, and GM20 Series Grooming Mowers

Anti-scalping roller attaches to front of deck
Anti-scalping roller attaches to front of deck
#

An anti-scalping roller kit can be ordered as an attachment for field conversion for FM and GM Series Grooming Mowers when it is not standard equipment. The roller is attached to the front of the cutting deck to help reduce scalping.

 

Each kit contains one roller.

Dimensions

Cutting width182.9 cm
72 in.
Overall machine width188 cm
74 in.
Cutting height2.5-12.7 cm
1-5 in.

Blade

CompositionHeat treated alloy steel
QuantityThree
Tip speed, average fpm5,099.91 m/min
16,732 fpm
Overlap2.9 cm
1.125 in.
Dimensions62.2x5.7 cm
24.5x2.25 in.
SpindlesQuantity
Three
Composition
Cast iron
Bearing
Shielded ball

Weight

Operational272.2 kg
600 lb
Shipping306.6 kg
676 lb

Caster Wheels

BearingsShielded roller
SolidSize
25.4x8.1 cm
10x3.2 in.
27.94x10.16 cm
11x4 in.
Yes
QuantityFour

Belts

QuantityTwo
Type5VX, polyester/cogged
AdjustmentSlotted track

Gearbox

Mower deck horsepower37.3 kW
50 hp
Ratio1:3.1

Hitch

CategoryCategory 1

Tractor Requirements

PTO rpm540 rpm
PTO horsepower14.9-37.3 kW
20-50 hp

Deck

Thickness8 gauge
4.176 mm
0.1644 in.
DischargeRear

Warranty

Gearbox1 year
Machine1 year
  • Working Width: 60 in. (152.4 cm)
  • PTO HP: 20 – 50 hp (14.9 – 37.3 kW)
  • Hitch: Cat. 1
Chris Vonholten

I felt like I had been doing business with Martin Tractor for years even though it was my first interaction with them.

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