Production run

Toro 20334 partsSerial 316000001–316999999

The only 20334 run that sits between two changes: the maintenance kit changed coming into it, the front wheel changes going out.

At your boundary

What changes at the edges of this run

Engine maintenance kits

20234→130-8148at 316000001

Kit 130-8148 is listed here; the preceding range listed 20234.

This change has already happened by the time your machine is in this range. The 20339 and the 20340 still list 20234 in their own 316 ranges, so this machine is ahead of those two.

Wheels and drive gears

59502→137-4833Pat 400000000

Front drive gear 59502 is still listed here. In the next range, Toro lists 8 Inch Front Wheel 137-4833P and does not list 59502.

The front of the machine changes one range later than the kit did. Working out "mine is a later machine" from the kit and ordering the front part on that basis means ordering from a listing that does not cover your serial number.

In detail

This production run

This range is the reason the 20334 has its own pages rather than a line on another machine's.

Two things change on this mower, and they change at different points. Coming into this range, the engine maintenance kit has already switched from 20234 to 130-8148 — that happened at 316000001, the first serial in this run. Going out of it, at 400000000, the front drive gear 59502 stops being listed and 8 Inch Front Wheel 137-4833P appears instead.

So a machine in this range sits on the newer kit and the older front part at the same time. That combination is the trap. Anyone who learns from the kit that their mower is "a later one" and then orders the front wheel to match is ordering from a listing that does not cover their serial number.

One thing the absence does not mean: Toro still lists 59502 for the 20339 in that machine's own 400 range, so the number is still published somewhere. It left this machine's listing, which is a narrower statement than it leaving the catalogue.

The traction assist part also changed at 316000001, from kit 108-8120 to handle 131-4590, and 131-4590 is what the next listing shows as well.

All fourteen of Toro's listings for this model are open to us.

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 316000001–316999999.
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 316000001–316999999.
Wheels and drive gears
Replacement Front Wheel Drive Internal Gear 59502
Listed by Toro as the Replacement Front Wheel Drive Internal Gear on its official parts page for model 20334, serial range 316000001–316999999 — the same range in which the maintenance kit has already changed.
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 316000001–316999999.
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 316000001–316999999.
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 316000001–316999999.
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 316000001–316999999.
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 316000001–316999999.

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 316000001–316999999; that range shows kit 130-8148 instead. Absence from a listing is not a statement that the part does not fit, so we make no claim either way.
108-8120 Not verified
Toro does not list kit 108-8120 on its parts page for model 20334, serial range 316000001–316999999; that range shows Traction Assist Handle 131-4590 instead. Toro does not state that one replaces the other.
137-4833P Not verified
Toro does not list front wheel 137-4833P on its parts page for model 20334, serial range 316000001–316999999; that range shows drive gear 59502.
59534 Not verified
Toro does not name 22 Inch Atomic Blade (59534) among the accessories on its parts page for model 20334, serial range 316000001–316999999.
120-3303 Not verified
Toro does not list engine maintenance kit 20234 among the accessories on its parts page for model 20334, serial range 316000001–316999999. 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 316000001–316999999. 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.
131-6572 Not verified
Toro does not name Premium Fuel Treatment (12 oz.) (131-6572) among the accessories on its parts page for model 20334, serial range 316000001–316999999.
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 20334, serial range 316000001–316999999.
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 20334, serial range 316000001–316999999.
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 316000001–316999999.
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 20334, serial range 316000001–316999999.
59310 Not verified
Toro does not name Replacement Bag (59310) among the accessories on its parts page for model 20334, serial range 316000001–316999999.
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 316000001–316999999.

If you are close to the edge

Serial numbers near a boundary

Both edges of this range are real boundaries, which is unusual. If your serial is near 316000001 or near 400000000, the part you need may be on the other side of one of them — and they are boundaries for different parts.

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 the full accessory lists on Toro’s parts pages for model 20334 under 315000001–315999999, 316000001–316999999 and 400000000–401999999, and recorded which parts differ in each direction, within the part categories this site records rather than across the whole accessory list. We cross-checked 59502 against Toro’s listing for the 20339 to establish that its absence here is a change to this machine rather than the part being withdrawn.

The common mistake: Treating one part’s boundary as the machine’s boundary. Across the fourteen listings now open, four different serials change something, and no single part accounts for them all.

Provenance

Sources

Last verified against these sources on August 19, 2026.

1
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.
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 315000001–315999999
The Toro Company · Primary source · Accessed August 17, 2026
Toro’s official parts listing for the earliest of the three ranges we verified. Lists 20234 (Engine Maintenance Kit for Briggs & Stratton Engine) and 108-8120 (TRACTION ASSIST KIT [PPG2]). Also lists 38991, 59534P, 59502, 59503 and 490-7462. The range selector on this page names thirteen further serial ranges for the same model number.
4
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.
5
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.