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Green Dade Outdoor Fitment Guide
John Deere 42" Deck Rebuild Kits & Parts Guide
John Deere 42-inch lawn tractor decks can look very similar while using different spindle and blade families. A common deck belt or similar model name does not necessarily mean the complete rebuild kit is interchangeable.
This guide compares two major 42-inch configurations carried by Green Dade Outdoor and explains how our rebuild kits progress from the essential wear components to more complete packages with idler and spindle pulleys.
Important:
Do not select a rebuild kit based only on the words
L100, LA100, D100, E100 or 100 Series.
Confirm the complete mower model and compare the OEM numbers on your
spindles, blades, belt and pulleys before ordering.
Why John Deere 42" Deck Fitment Can Be Confusing
Many John Deere 42-inch lawn tractors use the same GX20072 / GY20570 belt family and even the same idler pulley references. However, the spindle assemblies and blades can still be completely different.
This is why a belt match alone is not enough to confirm a rebuild kit. The spindle and blade OEM families are some of the most useful identifiers when separating these configurations.
GY20050 / GY20785 Family
Used by the Green Dade GY20995 rebuild-kit family for selected L100, L105, L107, L108, L110, L111 and L118 42-inch applications.
GY20454 / GY20962 Family
A different spindle configuration used across selected 100 Series, D100, E100, LA100 and X100-series 42-inch applications.
Same Belt Does Not Mean Same Kit
Both families can use the GX20072 / GY20570 belt and related idler pulleys, while requiring different spindles and blades.
Start With the Spindle and Blade Family
1
Find your complete mower model.
Use the full model designation whenever possible rather than relying
only on “John Deere 100 Series” or deck width.
2
Compare the spindle OEM number.
Determine whether your existing spindle corresponds to
GY20050/GY20785 or GY20454/GY20962/GY21098.
3
Check the blade OEM family.
The older GY20995-style configuration uses GX20249/GY20567-style
blades, while the other family uses GX22151/GY20850-style blades.
4
Then determine how complete a rebuild you need.
Once the base deck configuration is confirmed, decide whether your
idler pulleys and spindle pulleys also need replacement.
Family 1: GY20995 / GY20050-GY20785 Configuration
Selected John Deere L100-Series 42" Decks
Common fitment includes L100, L105, L107, L108, L110,
L111 and L118, depending on the exact configuration.
The Green Dade 80-DK-004, 80-DK-012 and 80-DK-049 share the same basic GY20995-style deck configuration. Their main difference is how many of the deck's wear components are included.
Their core components use spindle references GY20050, GY20785 and GX20152, blade references GX20249, GY20567 and GX20433, and belt references GX20072 and GY20570.
| Component | 80-DK-004 | 80-DK-012 | 80-DK-049 |
|---|---|---|---|
| 2 × GY20050/GY20785-style spindles | Included | Included | Included |
| 2 × GX20249/GY20567-style blades | Included | Included | Included |
| GX20072/GY20570 belt | Included | Included | Included |
| GY20110/GY20629 idler pulley | — | Included | Included |
| GY20067/GY22172 idler pulley | — | Included | Included |
| M155979/GX20335 spindle pulleys | — | — | Included |
How to read this:
80-DK-004 is the core rebuild configuration. 80-DK-012 adds the two
deck idler pulleys. 80-DK-049 goes one step further and also includes
the two spindle pulleys.
Choosing Between 80-DK-004, 80-DK-012 and 80-DK-049
A
Your spindles, blades and belt need replacement, but the pulleys are still good.
Start with 80-DK-004.
B
Your deck idler pulleys are also worn or noisy.
80-DK-012 adds the GY20110/GY20629 and
GY20067/GY22172 idler-pulley families.
C
You want to replace the spindle pulleys as well.
80-DK-049 is the most complete of these three
configurations and adds the M155979/GX20335 spindle pulleys.
Family 2: GY20454 / GY20962 / GY21098 Configuration
John Deere 100, D, E, LA and X Series 42" Applications
Selected models include 102, 105, 107S, 115, 125, 135,
D100-D130, E100-E130, LA100-LA135 and X105-X145.
This family uses a different spindle and blade configuration from the GY20995/L100 family above.
Green Dade 80-DK-017 and 80-DK-038 use spindle references GY20454, GY20962, GY21098 and GX22186 with blade references GX22151 and GY20850.
They can still use the familiar GX20072 / GY20570 belt and the same two idler pulley families. This overlap is exactly why the belt alone should never be used to identify the correct rebuild kit.
| Component | 80-DK-017 | 80-DK-038 |
|---|---|---|
| 2 × GY20454/GY20962-style spindles | Included | Included |
| 2 × GX22151/GY20850-style blades | Included | Included |
| GX20072/GY20570 belt | Included | Included |
| GY20110/GY20629 idler pulley | Included | Included |
| GY20067/GY22172 idler pulley | Included | Included |
| GX20367/UC23728 spindle pulleys | — | Included |
The difference here is simple:
80-DK-017 already includes the spindles, blades, belt and both idler
pulleys. 80-DK-038 adds the two GX20367/UC23728 spindle pulleys.
The Most Important Comparison: Family 1 vs Family 2
| Part | GY20995 / L100 Family | 100 / D / E / LA / X Family |
|---|---|---|
| Spindles | GY20050, GY20785, GX20152 | GY20454, GY20962, GY21098, GX22186 |
| Blades | GX20249, GY20567, GX20433 | GX22151, GY20850 |
| Deck belt | GX20072, GY20570 | GX20072, GY20570 |
| Large idler | GY20110, GY20629 | GY20110, GY20629 |
| Small idler | GY20067, GY22172 | GY20067, GY22172 |
| Spindle pulley | M155979, GX20335 | GX20367, UC23728 |
This table shows why fitment can be deceptive:
the belt and idler pulleys can match across both families while the
spindles, blades and spindle pulleys are different.
Always verify the complete combination.
Common Symptoms of Worn 42" Deck Components
Uneven Cutting
Worn spindle bearings, damaged blades or excessive spindle play can contribute to an uneven cut.
Grinding or Bearing Noise
Rough bearings or noisy spindle assemblies often become more obvious as blade speed increases.
Belt Keeps Coming Off
Check belt condition, routing, idler wear, spindle pulleys and deck alignment before replacing only the belt.
Wobbling Pulleys
Excessive pulley movement can affect belt tracking and may indicate pulley, bearing or spindle wear.
Excessive Vibration
Bent blades, worn spindle bearings or damaged pulleys can introduce vibration into the mower deck.
Multiple Worn Parts
When several wear components have reached the end of their service life, a rebuild kit can be more practical than individual replacement.
Shop John Deere 42" Rebuild Kit Configurations
42" Deck Rebuild Kit John Deere L100 L110 L118 Sabre Scotts GY20995
Core GY20995 configuration with GY20050/GY20785-style spindles, GX20249-style blades and GX20072/GY20570 belt.
$59.52
In stock
Check Fitment & Shop
42" Complete Deck Rebuild Kit John Deere L100 L110 L118 GY20995
Same GY20995 core configuration as 80-DK-004, with both deck idler pulleys added.
$71.00
In stock
Check Fitment & Shop
42" Complete Deck Rebuild Kit John Deere L100 L108 L110 L111 L118 GY20995
Most complete GY20995 configuration here, adding both idler pulleys and M155979/GX20335 spindle pulleys.
$79.00
Currently unavailable
Check Fitment & Shop
42" John Deere 100 Series 102 D105 E100 LA100 X105 Deck Rebuild Kit
GY20454/GY20962 spindle family with GX22151/GY20850 blades, belt and both deck idler pulleys.
$62.10
Currently unavailable
Check Fitment & Shop
42" John Deere 100 Series 102 D110 E120 LA100 X105 Deck Rebuild Kit
More complete version of the GY20454/GY20962 configuration, adding GX20367/UC23728 spindle pulleys.
$103.50
Currently unavailable
Check Fitment & Shop
Useful OEM Numbers to Compare
GY20995-family spindles
GY20050
GY20785
GX20152
GY20050
GY20785
GX20152
GY20995-family blades
GX20249
GY20567
GX20433
GX20249
GY20567
GX20433
GY20454-family spindles
GY20454
GY20962
GY21098
GX22186
GY20454
GY20962
GY21098
GX22186
GY20454-family blades
GX22151
GY20850
GX22151
GY20850
Common deck belt
GX20072
GY20570
Approx. 103-3/4"
GX20072
GY20570
Approx. 103-3/4"
Common idler pulleys
GY20110
GY20629
GY20067
GY22172
GY20110
GY20629
GY20067
GY22172
GY20995-family spindle pulleys
M155979
GX20335
M155979
GX20335
GY20454-family spindle pulleys
GX20367
UC23728
GX20367
UC23728
Frequently Asked Questions
Do all John Deere 42" lawn tractors use the same deck rebuild kit?
No. Multiple John Deere model families use 42-inch decks, and some share belts and idler pulleys while using different spindles and blades. Confirm the complete OEM combination before ordering.
What is the difference between 80-DK-004 and 80-DK-012?
They use the same basic GY20995-style spindle, blade and belt configuration. 80-DK-012 adds the two deck idler pulleys.
What is the difference between 80-DK-012 and 80-DK-049?
Both include the core GY20995 components and the two idler pulleys. 80-DK-049 also includes two M155979/GX20335 spindle pulleys.
What is the difference between 80-DK-017 and 80-DK-038?
Both use GY20454/GY20962-style spindles, GX22151/GY20850 blades, the GX20072/GY20570 belt and both idler pulleys. 80-DK-038 additionally includes GX20367/UC23728 spindle pulleys.
If my mower uses belt GX20072, can I use any of these kits?
No. GX20072/GY20570 is used by more than one deck configuration. You must also verify the spindle and blade OEM families.
How can I tell the two spindle families apart?
Compare the part number on your existing spindle or your mower's parts diagram. One family replaces GY20050/GY20785, while the other replaces GY20454/GY20962/GY21098.
Should I buy the most complete kit automatically?
Not necessarily. First confirm fitment, then inspect the idler and spindle pulleys. If those parts are still in good condition, a smaller configuration may be sufficient.
Does a matching 42-inch deck size guarantee compatibility?
No. Deck width is only one part of fitment. Spindles, blades, pulleys, belt routing and OEM references can differ between 42-inch decks.
What information should I have before contacting Green Dade?
Have your complete mower model number and, whenever possible, the OEM numbers from the spindle, blade, belt and pulleys. This makes fitment identification much more reliable.
Still Not Sure Which John Deere 42" Deck You Have?
Compare your complete mower model and OEM numbers with the two configurations above before ordering.
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