Production run

Toro 20334 partsSerial 400000000–401999999

The front of the machine changes: Toro lists 8 Inch Front Wheel 137-4833P here and stops listing drive gear 59502. The maintenance kit does not change again.

At your boundary

What changes at the edges of this run

Wheels and drive gears

59502→137-4833Pat 400000000

This range lists 137-4833P and does not list 59502; the preceding range lists 59502 and not 137-4833P.

Toro names 59502 an internal gear and describes it as an 8-in. wheel assembly, and names 137-4833P a front wheel. Ordering the wrong one for your range is a real risk, and Toro does not say whether either substitutes for the other.

In detail

This production run

By the time a 20334 reaches this range, its engine maintenance kit has been 130-8148 for a full production run — that changed back at 316000001. What changes here is the front of the machine.

Toro lists 8 Inch Front Wheel 137-4833P for this range. It does not list Replacement Front Wheel Drive Internal Gear 59502, which Toro names in the two ranges directly below this one and in no other listing of the fourteen. That is the last of the four boundaries the 20334 shows across those fourteen listings, and none of the other three sits at this serial.

We are recording the disappearance as unknown rather than as a statement that 59502 no longer fits, and there is a specific reason to be careful here: Toro still lists 59502 for the 20339 in that machine's own 400 range. The number is still published there. It has stopped appearing on this machine's listing, and Toro does not say why.

The blade, the drive belt and the rear wheel are unchanged from the earlier ranges. The traction assist handle 131-4590 matches the 316 listing but not the 315 one, which shows kit 108-8120 instead — that part changed a range earlier, at 316000001.

Toro publishes fourteen listings for the 20334, and this site has opened all fourteen.

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 20334, serial range 400000000–401999999. The same kit appears in the preceding 316-series range, so the kit does not change again here.
Handles and controls
Traction Assist Handle 131-4590
Listed by Toro as the Traction Assist Handle on its official parts page for model 20334, serial range 400000000–401999999.
Wheels and drive gears
8 Inch Front Wheel 137-4833P
Listed by Toro as the 8 Inch Front Wheel on its official parts page for model 20334, serial range 400000000–401999999.
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 400000000–401999999.
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 400000000–401999999.
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 400000000–401999999.
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 400000000–401999999.
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 400000000–401999999.
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 400000000–401999999.
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 400000000–401999999.
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 400000000–401999999.
Grass bags
Replacement Bag 59310
Listed by Toro as Replacement Bag among the accessories on its parts page for model 20334, serial range 400000000–401999999.
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 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 20334, serial range 400000000–401999999; that range shows kit 130-8148.
108-8120 Not verified
Toro does not list kit 108-8120 on its parts page for model 20334, serial range 400000000–401999999; that range shows Traction Assist Handle 131-4590.
59502 Not verified
Toro does not list 59502 on its parts page for model 20334, serial range 400000000–401999999; that range shows 8 Inch Front Wheel 137-4833P instead. The gear is still listed for the 20339 in its own 400-series range, so this is a change to this machine rather than the part being withdrawn.
59534 Not verified
Toro does not name 22 Inch Atomic Blade (59534) among the accessories on its parts page for model 20334, serial range 400000000–401999999.
120-3303 Not verified
Toro does not list engine maintenance kit 20234 among the accessories on its parts page for model 20334, serial range 400000000–401999999. 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 400000000–401999999. 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 400000000–401999999.
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 400000000–401999999.

If you are close to the edge

Serial numbers near a boundary

If your serial is just below 400000000 you are in the previous range, where Toro lists the drive gear rather than the front wheel. The two are different parts with different names, so check the plate rather than rounding.

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 compared Toro’s parts listing for model 20334 serial range 400000000–401999999 against the 316000001–316999999 listing, recording, within the part categories this site records, every part present in one and absent from the other, then opened Toro’s 20339 listing to establish that 59502 is still published for that machine.

The common mistake: Reading a part’s absence from a later listing as the part being discontinued. Toro does not say that, and the number is still listed for a sibling machine.

Provenance

Sources

Last verified against these sources on August 19, 2026.

1
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.
2
Parts — 22" SMARTSTOW Variable Speed High Wheel Lawn Mower, model 20339, serial range 400000000–401999999
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.
3
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.
4
Parts — 22" Personal Pace Electric Start Mower, model 20334, serial range 316000001–316999999
The Toro Company · Primary source · Accessed August 17, 2026
The next published range. Lists 130-8148 (Briggs & Stratton EXi Engine Maintenance Kit Replacement) and 131-4590 (Traction Assist Handle) where the previous range listed 20234 and 108-8120. Still lists 59502; 137-4833P does not appear.