Production run

Toro 20334 partsSerial 405639614–406577036

The last 20334 run listing engine oil 117-0066. The run below it has an identical accessory list; the one above swaps the oil for 138-6053.

At your boundary

What changes at the edges of this run

Engine oil

117-0066→138-6053at 406577037

This range lists *OBS* Toro full synthetic 10W-30 engine oil 117-0066 and does not list 138-6053. The listing directly above it, 406577037–999999999, lists 138-6053 and not 117-0066.

The two listings are consecutive in Toro’s own selector, so the change sits at 406577037 rather than somewhere between unread runs. Toro also points the older number at the newer one: requesting the 117-0066 product page serves the 138-6053 page under “Replaces Product 117-0066”.

In detail

This production run

This is the last 20334 run for which Toro lists the older engine oil, 117-0066, which it names *OBS* Toro full synthetic 10W-30 engine oil. From 406577037 the listings show 138-6053 instead, and Toro states on its product page that the newer number replaces the older one.

The more useful thing about this range is what does not happen at its lower edge. Toro splits its listings at 405639614, and the run below this one — 404320000–405639613 — carries exactly the same accessories, part number for part number, with nothing added and nothing dropped. Within the categories this site records, a serial on either side of 405639614 is listed with the same accessories. The two pages also name the same Parts Catalog form number, 3423-540, and the same seven assembly-drawing titles. The split is real in Toro’s catalogue and changes nothing in the accessory list.

So this range has one edge that matters and one that does not, and they are at opposite ends of it. A reader whose serial falls here needs to know about 406577037 above and can ignore 405639614 below.

One caution that belongs on this page rather than the next. 117-0066 is not listed continuously up to this point: it is listed for 400000000–401999999 and absent from 402000000–404319999, a listing that also drops six other numbers at the same time — a bottled fuel, a fuel treatment, two SAE 30 oils and two bags — all of them back in the run above. We read that as a thin listing rather than an earlier boundary, and do not count this range as the second time the oil changed.

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.

Drive belts
22 inch Drive Belt for RWD Toro WPM 38991
Listed by Toro as 22 inch Drive Belt for RWD Toro WPM on its official parts page for model 20334, serial range 405639614–406577036.
Wheels and drive gears
8 inch Replacement Rear-Wheel-Drive Wheel for Lawn Mowers 59503
Listed by Toro as 8 inch Replacement Rear-Wheel-Drive Wheel for Lawn Mowers on its official parts page for model 20334, serial range 405639614–406577036.
Engine maintenance kits
Briggs & Stratton EXi Engine Maintenance Kit Replacement 130-8148
Listed by Toro as Briggs & Stratton EXi Engine Maintenance Kit Replacement on its official parts page for model 20334, serial range 405639614–406577036.
Handles and controls
Traction Assist Handle 131-4590
Listed by Toro as Traction Assist Handle on its official parts page for model 20334, serial range 405639614–406577036.
Fuel treatment
Premium Fuel Treatment (0.5 oz.) 130-2393
Listed by Toro as Premium Fuel Treatment (0.5 oz.) on its official parts page for model 20334, serial range 405639614–406577036.
Wheels and drive gears
8 Inch Front Wheel 137-4833P
Listed by Toro as 8 Inch Front Wheel on its official parts page for model 20334, serial range 405639614–406577036.
Mower blades
22 Inch Recycler Blade 59534P
Listed by Toro as 22 Inch Recycler Blade on its official parts page for model 20334, serial range 405639614–406577036.
Fuel treatment
Premium Fuel Treatment (12 oz.) 131-6572
Listed by Toro as Premium Fuel Treatment (12 oz.) among the accessories on its parts page for model 20334, serial range 405639614–406577036.
Engine oil
SAE 30 4-Cycle Lawn Mower Engine Oil 32 oz 38903
Listed by Toro as SAE 30 4-Cycle Lawn Mower Engine Oil 32 oz among the accessories on its parts page for model 20334, serial range 405639614–406577036.
Engine oil
SAE 30 4-Cycle Summer Engine Oil 18 oz. 38916
Listed by Toro as SAE 30 4-Cycle Summer Engine Oil 18 oz. among the accessories on its parts page for model 20334, serial range 405639614–406577036.
Engine oil
Toro full synthetic 10W-30 engine oil 117-0066
Listed by Toro as *OBS* Toro full synthetic 10W-30 engine oil among the accessories on its parts page for model 20334, serial range 405639614–406577036.
Grass bags
Replacement Bag 59310
Listed by Toro as Replacement Bag among the accessories on its parts page for model 20334, serial range 405639614–406577036.
Striping kits
Striping Kit for Walk-Behind Mowers 20601
Listed by Toro as Striping Kit for Walk-Behind Mowers among the accessories on its parts page for model 20334, serial range 405639614–406577036.

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 name Engine Maintenance Kit for Briggs & Stratton Engine (20234) among the accessories on its parts page for model 20334, serial range 405639614–406577036.
59502 Not verified
Toro does not name Replacement Front Wheel Drive Internal Gear (59502) among the accessories on its parts page for model 20334, serial range 405639614–406577036.
108-8120 Not verified
Toro does not name TRACTION ASSIST KIT [PPG2] (108-8120) among the accessories on its parts page for model 20334, serial range 405639614–406577036.
59534 Not verified
Toro does not name 22 Inch Atomic Blade (59534) among the accessories on its parts page for model 20334, serial range 405639614–406577036.
120-3303 Not verified
Toro does not list engine maintenance kit 20234 among the accessories on its parts page for model 20334, serial range 405639614–406577036. This site reaches this component only as a content of that kit, so with the kit absent there is no route from Toro’s pages to this part for this range — a fact about the route, not about the machine.
120-3305 Not verified
Toro does not list engine maintenance kit 20234 among the accessories on its parts page for model 20334, serial range 405639614–406577036. This site reaches this component only as a content of that kit, so with the kit absent there is no route from Toro’s pages to this part for this range — a fact about the route, not about the machine.
138-6053 Not verified
Toro does not name Toro Full Synthetic 10W-30 Engine Oil (32 oz.) (138-6053) among the accessories on its parts page for model 20334, serial range 405639614–406577036.
59312 Not verified
Toro does not name BAG - REPL KIT 2009 RWD RC (59312) among the accessories on its parts page for model 20334, serial range 405639614–406577036.

If you are close to the edge

Serial numbers near a boundary

The edge that matters is the top one. A serial at 406577036 is in this range and Toro lists 117-0066 for it; one digit higher and the listing shows 138-6053. The lower edge at 405639614 separates two listings whose accessories are identical.

Where Toro puts the serial plate

Other runs

Other production runs of the 20334

Toro publishes 14 parts listings for this model number. We have opened 14.

Method

How we established this

We opened all fourteen listings Toro publishes for model 20334 and compared this range’s accessory list in full against both neighbours — 404320000–405639613 below and 406577037–999999999 above — then opened the product pages for both oil numbers. 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.

The common mistake: Assuming every serial range Toro publishes marks a change. This machine’s 405639614 split does not change the accessory list: the lists either side of it are the same.

Provenance

Sources

Last verified against these sources on September 18, 2026.

1
Parts — 22in Recycler Lawn Mower, model 20334, serial range 405639614–406577036
The Toro Company · Primary source · Accessed August 21, 2026
Toro’s official parts listing for this model and serial range, reached from the serial-range selector its own page carries. Of the parts this site holds, its accessory list names 38991, 59503, 130-8148, 131-4590, 490-7462, 130-2393, 137-4833P, and does not name 20234, 59502, 108-8120. The page carries further items this site holds no record for, among them engine oils, bags and a striping kit.
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 — 22" Personal Pace Electric Start Mower, model 20334, serial range 400000000–401999999
The Toro Company · Primary source · Accessed August 17, 2026
The later range. Still lists 130-8148 and 131-4590, so the maintenance kit does not change again here. It lists 137-4833P (8 Inch Front Wheel) and does not list 59502 — a second, separate boundary within the same model number.
4
Parts — 22in Recycler Lawn Mower, model 20334, serial range 402000000–404319999
The Toro Company · Primary source · Accessed August 21, 2026
Toro’s official parts listing for this model and serial range, reached from the serial-range selector its own page carries. Of the parts this site holds, its accessory list names 38991, 59503, 130-8148, 131-4590, 490-7462, 130-2393, 137-4833P, and does not name 20234, 59502, 108-8120. The page carries further items this site holds no record for, among them engine oils, bags and a striping kit.
5
Parts — 22in Recycler Lawn Mower, model 20334, serial range 404320000–405639613
The Toro Company · Primary source · Accessed August 21, 2026
Toro’s official parts listing for this model and serial range, reached from the serial-range selector its own page carries. Of the parts this site holds, its accessory list names 38991, 59503, 130-8148, 131-4590, 490-7462, 130-2393, 137-4833P, and does not name 20234, 59502, 108-8120. The page carries further items this site holds no record for, among them engine oils, bags and a striping kit.
6
Parts — 22in Recycler Lawn Mower, model 20334, serial range 406577037–999999999
The Toro Company · Primary source · Accessed August 21, 2026
Toro’s official parts listing for this model and serial range, reached from the serial-range selector its own page carries. Of the parts this site holds, its accessory list names 38991, 59503, 130-8148, 131-4590, 490-7462, 130-2393, 137-4833P, and does not name 20234, 59502, 108-8120. The page carries further items this site holds no record for, among them engine oils, bags and a striping kit.
7
OIL-30/10W-30 SYNTHETIC CK4 [QT] (Part # 138-6053), served at /product/117-0066
The Toro Company · Primary source · Accessed September 5, 2026
Requesting the 117-0066 product URL serves the page for 138-6053 under the line “Replaces Product 117-0066”, which is Toro stating the oil supersession directly rather than this site inferring it from which number sits against which serial range. Re-read 31 August 2026 and unchanged, and again 5 September 2026. Internal designation OIL-30/10W-30 SYNTHETIC CK4 [QT]. One bullet frames the oil for zero-turn riding mowers (TimeCutter MX, Titan, Titan MX) while the overview calls it the choice for any outdoor power equipment; the page names no walk-behind model. It does state a capacity — the title reads “(32 oz.)” and the first bullet repeats “10W-30 engine oil (32 oz.)” — corrected 5 September 2026 from an earlier reading that missed it.
8
OIL-30/10W-30 SYNTHETIC CK4 [QT] (Part # 138-6053)
The Toro Company · Primary source · Accessed August 28, 2026
The same page served at its own number, and it is the same page carrying that one “Replaces Product 117-0066” line — so Toro states the supersession once and either number reaches it, which is not the same as stating it from both directions. This page is now also the source for part 138-6053 itself: batch 13 created the pt_engine_oil category, so the clause that used to sit here — that engine oil is in no category this site records — stopped being true the moment that batch was staged.