Production run
Toro 20339 partsSerial 314000001–314999999
The shortest of the nine 20339 listings, all open. It sells two parts we hold — blade 59534P and kit 20234 — and names three more inside the kit.
At your boundary
What changes at the edges of this run
Drive belts
—→38990at 315000001
No drive belt is among this range’s accessories. The next listing, 315000001–315999999, names 22 Inch Drive Belt for Recycler Mower 38990.
These two listings are consecutive, so the belt starts being offered at this serial. Every one of the seven later runs names it too.
Wheels and drive gears
—→59502at 315000001
Replacement Front Wheel Drive Internal Gear 59502 is absent here and present in the next listing.
It arrives on the same serial as the belt, the cover and the fuel treatment. Four unrelated parts appearing at once looks to us like a listing being filled in rather than four simultaneous design changes — an inference, since Toro gives no reason on the page.
In detail
This production run
A 20339 whose serial number starts 314 is the earliest run Toro publishes a parts listing for, and that listing is shorter than the other eight.
Of the parts this site holds records for, this listing offers two as things you can order: the 22 Inch Recycler Blade 59534P, and the Engine Maintenance Kit for Briggs & Stratton Engine 20234. No drive belt. No front-wheel drive internal gear. No cover.
It names three more without selling any of them, inside the kit’s own description: "The kit contains 20 oz. SAE 30 engine oil (#120-3306), a spark plug (#120-3305), an air filter (#120-3303) and a 0.5 oz. packet of fuel treatment (#130-2393)." So air filter 120-3303, spark plug 120-3305 and fuel treatment 130-2393 all appear on this page — as contents of the kit, not as lines you can add to a cart. That distinction is the whole of what this site can say about them: Toro tells you they are in the box, and does not tell you they fit your mower.
All four of those absences end in the very next listing, 315000001–315999999, and none of the four returns to being absent in any listing after it. The two runs are consecutive in Toro’s own list, so this is a real edge rather than a gap we are bracketing.
The honest reading is the uncomfortable one: we cannot tell you the 22 Inch Drive Belt 38990 fits a 314-series machine, and we cannot tell you it does not. The listing for these serials carries no belt. That is a fact about the catalogue and not about the mower, and this site records it as unknown rather than guessing in either direction.
The maintenance kit is still 20234 here, as it is for the 315 and 316 runs. It changes much later, at 400000000.
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
Engine Maintenance Kit for Briggs & Stratton Engine 20234
Listed by Toro as Engine Maintenance Kit for Briggs & Stratton Engine on its official parts page for model 20339, serial range 314000001–314999999.
Mower blades
22 Inch Recycler Blade 59534P
Listed by Toro as 22 Inch Recycler Blade on its official parts page for model 20339, serial range 314000001–314999999.
Grass bags
Grass Bag for Walk Power Mower 59305
Listed by Toro as Grass Bag for Walk Power Mower among the accessories on its parts page for model 20339, serial range 314000001–314999999.
Grass bags
Bag Replacement Kit 59307
Listed by Toro as Bag Replacement Kit among the accessories on its parts page for model 20339, serial range 314000001–314999999.
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.
38990 Not verified
Toro does not name 22 Inch Drive Belt for Recycler Mower (38990) among the accessories on its parts page for model 20339, serial range 314000001–314999999.
59502 Not verified
Toro does not name Replacement Front Wheel Drive Internal Gear (59502) among the accessories on its parts page for model 20339, serial range 314000001–314999999.
130-8148 Not verified
Toro does not name Briggs & Stratton EXi Engine Maintenance Kit Replacement (130-8148) among the accessories on its parts page for model 20339, serial range 314000001–314999999.
137-4837P Not verified
Toro does not name Replacement 11 in. Rear High Wheel for Push and Front Wheel Drive Lawn Mowers (137-4837P) among the accessories on its parts page for model 20339, serial range 314000001–314999999.
490-2012 Not verified
Toro does not name Smart Stow Cover (490-2012) among the accessories on its parts page for model 20339, serial range 314000001–314999999.
131-6572 Not verified
Toro does not name Premium Fuel Treatment (12 oz.) (131-6572) among the accessories on its parts page for model 20339, serial range 314000001–314999999.
38903 Not verified
Toro does not name SAE 30 4-Cycle Lawn Mower Engine Oil 32 oz (38903) among the accessories on its parts page for model 20339, serial range 314000001–314999999.
38916 Not verified
Toro does not name SAE 30 4-Cycle Summer Engine Oil 18 oz. (38916) among the accessories on its parts page for model 20339, serial range 314000001–314999999.
117-0066 Not verified
Toro does not name *OBS* Toro full synthetic 10W-30 engine oil (117-0066) among the accessories on its parts page for model 20339, serial range 314000001–314999999.
20601 Not verified
Toro does not name Striping Kit for Walk-Behind Mowers (20601) among the accessories on its parts page for model 20339, serial range 314000001–314999999.
If you are close to the edge
Serial numbers near a boundary
The top of this range is a sharp edge with a consecutive listing above it. If your serial is in the last few thousand, read the plate again — one digit decides whether Toro lists a drive belt for your machine at all.
Other runs
Other production runs of the 20339
Toro publishes 9 parts listings for this model number. We have opened 9.
Method
How we established this
We opened all nine of Toro’s parts listings for model 20339. The count comes from the serial-range selector the listings carry. The pages also carry accessories this site holds no record for, so this is a comparison within the categories it records rather than an exhaustive diff of what they list. One entry on the 315 and 316 listings, an XRef to 137-4837 under part number 119-0313, is not in this site’s dataset and no claim here depends on it.
The common mistake: Treating the shortness of this listing as evidence that the early machine had fewer serviceable parts. It is evidence about the listing and nothing more. What a parts listing omits is not a specification.
Provenance
Sources
Last verified against these sources on August 28, 2026.
- 1
Parts — 22in Recycler Lawn Mower with SmartStow, model 20339, serial range 314000001–314999999
The Toro Company · Primary source · Accessed August 20, 2026
Toro’s official parts listing for this model and serial range, reached from the serial-range selector on the model’s other listings. Within the part categories this site records, its accessory list names 20234, and does not name 38990, 59502, 130-8148, 137-4837P, 490-2012. The page carries further accessories this site holds no record for, among them engine oils, bags and fuel products other than 130-2393.
- 2
Engine Maintenance Kit for Briggs & Stratton Engine (Part # 20234)
The Toro Company · Primary source · Accessed August 31, 2026
Toro’s product page for the kit, and one of the few in this family that is a page for the number requested rather than for a part replacing it. It itemizes the kit: 20 oz. SAE 30 engine oil (120-3306), a spark plug (120-3305), an air filter (120-3303) and a 0.5 oz. packet of fuel treatment (130-2393). It carries no line saying this kit replaces another number or has been replaced by one. **Re-read 31 August 2026 and unchanged in every particular, including the 0.5 oz.** — which matters, because the page Toro serves for 130-8148 gives the same packet as .05 oz. Two further details this record had not held: the internal designation TORO WPM MAINT KIT - BRIGGS, and a Specifications row reading Service Pack Yes.
- 3
Parts — 22in Recycler Lawn Mower with SmartStow, model 20339, serial range 315000001–315999999
The Toro Company · Primary source · Accessed August 20, 2026
Toro’s official parts listing for this model and serial range, reached from the serial-range selector on the model’s other listings. Within the part categories this site records, its accessory list names 20234, 38990, 59502, 490-2012, and does not name 130-8148, 137-4837P. The page carries further accessories this site holds no record for, among them engine oils, bags and fuel products other than 130-2393.
- 4
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.