KIOTI · COMPACT TRACTOR ATTACHMENTS
The base CK4020 family offers 33.3–34.8 PTO hp, yet carries the same brochure lift rating as the smaller CK2620. Upper power limits exclude some compact chippers, and ambiguous mower power ranges still need clarification.
By Acreage Equipment · Reviewed November 6, 2026 · Specification research, not a field test
PTO WOOD CHIPPERS FOR THE CK4020
11 of 19 pto wood chippers we track pass the published power, hitch and speed screen on at least one configuration. Each still has a detail to confirm with the seller.
PTO chipperWoodland Mills
6″ max. chip diameter · 20–50 PTO hp
Confirm the conflicting tractor specifications in your serial-specific manual; official source values differ.
PTO chipperFarmry
5″ max. chip diameter · 15–45 engine hp
Confirm the conflicting tractor specifications in your serial-specific manual; official source values differ.
PTO chipperFarmry
5″ max. chip diameter · 15–45 PTO hp
Resolve the conflicting published specifications for the exact model revision.
PTO chipperWallenstein
5″ max. chip diameter · 30–55 engine hp · current U.S. page (manual table: 40–55 hp for the BX52R)
Confirm the correct attachment and driveline configuration for the tractor’s PTO speed; listed speed options are discrete settings.
PTO chipperFarmer-Helper
4″ published feed-capacity short side, inches · 15–45 PTO hp in current index-linked manual; older/page conflicts retained
Confirm the complete operating weight; a shipping weight cannot establish the attachment load.
PTO chipperFarmer-Helper
6.5″ manual feed-opening short side, inches · 25–45 PTO hp in current index-linked manual; older capacity/range conflicts retained
Confirm the complete operating weight; a shipping weight cannot establish the attachment load.
5 more possible options in the full comparison table — see all.
FLAIL MOWERS FOR THE CK4020
19 of 23 flail mowers we track pass the published power, hitch and speed screen on at least one configuration. Each still has a detail to confirm with the seller.
Flail mowerFarmer-Helper
37″ cutting width, inches · 15–45 PTO hp on the product page; manual lists the 15-PTO-hp minimum and a 45-hp gearbox
Confirm the conflicting tractor specifications in your serial-specific manual; official source values differ.
Flail mowerFarmer-Helper
41″ cutting width, inches · 16–45 PTO hp on the product page; manual lists the 16-PTO-hp minimum and a 45-hp gearbox
Confirm the conflicting tractor specifications in your serial-specific manual; official source values differ.
Flail mowerFarmer-Helper
48″ cutting width, inches · 20–45 PTO hp on the product page; manual lists the 20-PTO-hp minimum and a 45-hp gearbox
Confirm the conflicting tractor specifications in your serial-specific manual; official source values differ.
Flail mowerFarmry
45.3″ cutting width · 15–35 hp · basis unclear
Ask the manufacturer whether the horsepower range means engine or PTO power.
Flail mowerFarmry
53.1″ cutting width · 15–35 hp · basis unclear
Ask the manufacturer whether the horsepower range means engine or PTO power.
Flail mowerFarmry
61″ cutting width · 15–35 hp · basis unclear
Ask the manufacturer whether the horsepower range means engine or PTO power.
13 more possible options in the full comparison table — see all.
Manual
Base U.S. CK4020 manual and CK4020H hydrostatic CK20 models; excludes SE, SEH, cab, preceding CK10 and newer CK40-series models. No production-year cutoff is established.
HST, three ranges
Base U.S. CK4020 manual and CK4020H hydrostatic CK20 models; excludes SE, SEH, cab, preceding CK10 and newer CK40-series models. No production-year cutoff is established.
Current base-model webpage says 12 forward / 12 reverse; current linked base CK20 brochure says 9F/3R. The brochure's SE row separately says 12 x 12.
Use Manual as the transmission label, omit a verified gear count, and retain exact model/serial check. Do not assume the webpage is the SE variant.
Some current HST/CK3520 web tables label steering Mechanical while the brochure says Hydraulic Power Steering; brochure merges Dry Dual Stage clutch across base models while HST web pages say Dry Single Stage.
Do not publish steering/clutch specifics as verified in this batch. These inconsistencies do not change the corroborated PTO horsepower and hitch-category facts.
FOLLOW THE NUMBERS
Research record reviewed November 6, 2026. Confirm the current manual and the exact revision supplied with your machine.
FROM YOUR TRACTOR TO THE JOB
The CK4020 has 39.6 gross engine hp and either 34.8 or 33.3 PTO hp. That creates an unusual Farmry LFS question: PTO power falls within its advertised 15–35 hp range while engine power exceeds it. Until the maker states the basis, the answer stays unresolved.
Read the guide →FIELD GUIDEThe base CK4020 has 34.8 PTO hp with manual transmission; CK4020H has 33.3. Both exceed the 30 PTO-hp maximum on WC46 and TFG55, yet both remain below WC88’s 35 PTO-hp minimum. WC68 clears these published power boundaries. That makes this a useful case where moving up through the chipper sizes does not create an uninterrupted list of options.
Read the guide →