Production run
Toro 20334 partsSerial 400000000–401999999
The front of the machine changes here: Toro lists 8 Inch Front Wheel 137-4833P for this range 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 we opened 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 appeared in both of the earlier ranges we opened. That is the second of the two boundaries visible in the three listings we opened, and it is not in the same place as the first.
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.
This is the latest of the three listings we have opened, out of fourteen Toro publishes.
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.
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.
Every run we opened
Unchanged across the runs we opened
59534P, 38991, 59503, 130-2393, 490-7462. Full detail on the 20334 page.
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.
Other runs
Other production runs of the 20334
Toro publishes 14 parts listings for this model number. We have opened 3.
Method
How we established this
We compared Toro’s parts listing for model 20334 serial range 400000000–401999999 against the 316000001–316999999 listing, recording 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
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
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.