Production run
Toro 20339 partsSerial 400000000–401999999
The later of two 20339 runs we opened: kit 130-8148 replaces 20234, and the rear wheel is sold here as a named product rather than the cross-reference the earlier run carries.
At your boundary
What changes at the edges of this run
Engine maintenance kits
20234→130-8148at 400000000
This range lists 130-8148; the 316000001–316999999 range lists 20234.
Both differences we found between the two listings land on this same serial, and the listings are consecutive.
In detail
This production run
Toro sells the rear wheel as a named product on this listing: Replacement 11 in. Rear High Wheel for Push and Front Wheel Drive Lawn Mowers, part number 137-4837P, with a description and a price.
The 316-series listing handles the same position differently. There the entry is a bare cross-reference — XRef: 137-4837 (Part # 119-0313) — labelled Genuine OEM Part, with no product name and no price. It is the only unnamed entry in that list. Whether 119-0313, the 137-4837 it points at, and the 137-4837P sold here are one wheel across three numbers or something less tidy, Toro does not say on either page, and we are not going to fill that in.
The maintenance kit is the change we can state plainly: 20234 on the earlier listing, 130-8148 here. Those two listings are consecutive, so that boundary sits exactly at 400000000.
Seven of the nine listings Toro publishes for this model number remain unopened.
Confirmed
What we have recorded for this serial range
We record the part categories this site covers. Toro’s own listing for this range carries other accessories besides.
Engine maintenance kits
Briggs & Stratton EXi Engine Maintenance Kit Replacement 130-8148
Listed by Toro as the Briggs & Stratton EXi Engine Maintenance Kit Replacement on its official parts page for model 20339, serial range 400000000–401999999.
Wheels and drive gears
Replacement 11 in. Rear High Wheel for Push and Front Wheel Drive Lawn Mowers 137-4837P
Listed by Toro as the Replacement 11 in. Rear High Wheel for Push and Front Wheel Drive Lawn Mowers on its official parts page for model 20339, serial range 400000000–401999999.
Not listed here
Listed for a neighbouring run, but not this one
Absence from a parts listing is not a statement that a part does not fit. It is the manufacturer not saying.
20234 Not verified
Toro does not list kit 20234 on its parts page for model 20339, serial range 400000000–401999999; that range shows kit 130-8148 instead.
Every run we opened
Unchanged across the runs we opened
59534P, 38990, 59502, 490-2012, 130-2393. Full detail on the 20339 page.
If you are close to the edge
Serial numbers near a boundary
If your plate reads just below 400000000 you are in the previous run, where Toro lists kit 20234 and handles the rear wheel as a cross-reference rather than as a product.
Other runs
Other production runs of the 20339
Toro publishes 9 parts listings for this model number. We have opened 2.
Method
How we established this
We compared Toro’s parts listing for model 20339 serial range 400000000–401999999 against the 316000001–316999999 listing, within the part categories this site records. Both pages carry accessories in other categories that we do not track, so this is not an exhaustive diff.
The common mistake: Reading 137-4837P as new to this range. The earlier listing does carry a rear-wheel entry; what changes is that Toro names and prices it here and does not there.
Provenance
Sources
Last verified against these sources on August 20, 2026.
- 1
The Toro Company · Primary source · Accessed August 17, 2026
Lists 130-8148 in place of 20234, and adds 137-4837P (Replacement 11 in. Rear High Wheel). Still lists 38990 and 59502.
- 2
The Toro Company · Primary source · Accessed August 17, 2026
Lists 20234 (Engine Maintenance Kit for Briggs & Stratton Engine), 38990 (22 Inch Drive Belt for Recycler Mower), 59534P, 59502 and 490-2012. The range selector names eight further serial ranges for this model number.