Mower series / Cub Cadet
Cub Cadet PRO X 600 Series
The Cub Cadet PRO X 600 Series is a commercial stand-on mower: the PRO X 636, 648, 654 and 660 EFI. Decks run 36, 48, 54 and 60 inches. Kawasaki FS and FX engines make 18.5 to 34.5 hp. At J5 Tractors, our Conroe, Navasota, Normangee and Buna stores sell it.
At a glance
stand-on · 4 models: PRO X 636, PRO X 648, PRO X 654 and PRO X 660 EFI
- Deck size
- 36-60 in
- Engine
- Kawasaki FS or Kawasaki FX or Kawasaki FX EFI
- Engine horsepower
- 18.5-34.5 hp
- Transmission
- 12cc Hydro-Gear pumps / 240cc Parker wheel motors
- Top speed
- 8.5-10 mph
- Cutting height
- 1-5 in
- Fuel capacity
- 6-7.5 gal
- Drive
- Hydrostatic; lap bar steering
Sold at Conroe, Navasota, Normangee and Buna. Best for lawn and landscape crews, mowing all week, a wide deck on a stand-on.
Every model, side by side
| Specification | PRO X 636 | PRO X 648 | PRO X 654 | PRO X 660 EFI |
|---|---|---|---|---|
| Engine | ||||
| Engine | Kawasaki FS Series (600V) | Kawasaki FX Series (691V) | Kawasaki FX Series (801V) | Kawasaki FX Series EFI (820 EVO) |
| Engine horsepower | 18.5 hp | 22 hp | 25.5 hp | 34.5 hp |
| Displacement | 603 cc | 726 cc | 852 cc | 822 cc |
| Fuel capacity | 6 gal | 7.5 gal | 7.5 gal | 7.5 gal |
| Deck | ||||
| Deck size | 36 in | 48 in | 54 in | 60 in |
| Deck construction | 10 ga shell w/ 7 ga top & bottom reinforcement | 10 ga shell w/ 7 ga top & bottom reinforcement | 10 ga shell w/ 7 ga top & bottom reinforcement; 10-gauge steel | 10 ga shell w/ 7 ga top & bottom reinforcement; 10-gauge steel |
| Cutting height | 1.75-4.5 in | 1.5-4.5 in | 1.5-4.5 in | 1-5 in (1/4 in increments) |
| Blades | Two 18.5" high-lift blades, 1-1/2" of blade overlap | 3 17" long high-lift Marbain blades, 1-1/2" of blade overlap | Three 19" long high-lift Marbain blades, 1-1/2" of blade overlap | Three 21" long high-lift Marbain blades, 1-1/2" of blade overlap |
| Drive | ||||
| Transmission | 12cc Hydro-Gear pumps / 240cc Parker wheel motors | 12cc Hydro-Gear pumps / 240cc Parker wheel motors | 12cc Hydro-Gear pumps / 240cc Parker wheel motors | 12cc Hydro-Gear pumps / 240cc Parker wheel motors |
| Top speed (forward) | 8.5 mph | 10 mph | 10 mph | 10 mph |
| Top speed (reverse) | 4.25 mph | 5 mph | 5 mph | 5 mph |
| Size | ||||
| Front tires | 11x4-5 RF | 13x5-6" Reliance Run Flat carlisle | 13x5-6" Reliance Run Flat carlisle | 13x5-6" Reliance Run Flat carlisle |
| Rear tires | 21"x8.5"-10" | 24"x9.5"-12" | 24"x12"-12" | 24"x12"-12" |
| Comfort | ||||
| Suspension | None | Hand lever adjust, 3-position spring suspension foot platform | Hand lever adjust, 3-position spring suspension foot platform | Hand lever adjust, 3-position spring suspension foot platform |
| Current pricing | See PRO X 636 pricing | See PRO X 648 pricing | See PRO X 654 pricing | See PRO X 660 EFI pricing |
All specifications on this page were taken directly from Cub Cadet, the manufacturer. Figures from Cub Cadet PRO X 600 Series product comparison (specifications) and Cub Cadet series page, checked November 2, 2026: Cub Cadet PRO X 600 Series product comparison (specifications), Cub Cadet series page.
Four decks, four engines
The 636 is the small one. It runs an 18.5 hp Kawasaki FS 600V, two 18.5-inch blades and a 6-gallon tank. It reaches 8.5 mph forward and 4.25 mph in reverse, and cuts from 1.75 to 4.5 inches.
The 648 and 654 step up to Kawasaki FX engines: 22 hp on the 648 and 25.5 hp on the 654. The 660 EFI runs a 34.5 hp fuel-injected Kawasaki FX 820 EVO. Those three carry 7.5 gallons and reach 10 mph forward, 5 in reverse. Each spins three Marbain blades, 17, 19 or 21 inches long.
The 648 and 654 cut from 1.5 to 4.5 inches. The 660 EFI goes from 1 to 5 inches in quarter-inch steps.
Built for the crew that mows all week
Each PRO X 600 drives through 12cc Hydro-Gear pumps and 240cc Parker wheel motors. The deck's a 10-gauge shell with 7-gauge reinforcement top and bottom. The blades overlap by an inch and a half, so the passes they cut meet.
On the 648, 654 and 660 EFI, the foot platform rides on springs. A hand lever sets it to one of three positions. You'll notice it by the end of a full day on your feet, and so will your knees.
Buyers at our Conroe store include landscape crews and construction outfits, along with small landowners. If you're running a crew, a stand-on's easy to step on and off at every gate. The 60-inch 660 EFI is the one for the widest open lots. Want a smaller stand-on with a Kohler engine? Look at the PRO X 400 Series.
Looking for pricing?
Current pricing is on our live inventory page at j5tractors.com, where our Conroe, Navasota, Normangee and Buna stores list the Cub Cadet mowers they have. Check the PRO X 636, PRO X 648, PRO X 654 and PRO X 660 EFI there, then call the store to see one.
Financing
Financing for the Cub Cadet PRO X 600 Series starts with our easy online credit application. It works for new and pre-owned machines.
Reach out to our sales team
- Gene Crye and Andrew LilleyConroe store(936) 441-8110
- Bryan LathamNavasota store(936) 825-8722
- Gavin Johnson and Cody JohnsonNormangee store(936) 396-6032
- George Holder and Steve JeterBuna store(409) 994-3522
Questions people ask
Which model in Cub Cadet's PRO X 600 Series is fuel injected?
The PRO X 660 EFI. It runs a Kawasaki FX Series EFI 820 EVO of 822 cc, rated at 34.5 hp. You get that with a 60-inch deck, three 21-inch Marbain blades and a 7.5-gallon tank. It's also the one PRO X 600 that cuts from 1 to 5 inches.
Is the Cub Cadet PRO X 636 built like the bigger PRO X 600 models?
Mostly. It shares the 10-gauge deck shell with 7-gauge reinforcement, and the 12cc Hydro-Gear pumps with 240cc Parker wheel motors. It's smaller where you'd expect: an 18.5 hp Kawasaki FS, a 36-inch deck and a 6-gallon tank. It has no spring suspension on the platform, and it tops out at 8.5 mph.
How long are the blades on Cub Cadet's PRO X 654?
Three 19-inch high-lift Marbain blades, overlapping by an inch and a half. They spin under a 54-inch deck with a 10-gauge shell and 7-gauge reinforcement. The 654 runs a 25.5 hp Kawasaki FX 801V and reaches 10 mph. When it's time for new blades, bring your model number to the parts counter.
How much does a Cub Cadet PRO X 600 Series mower cost?
We keep current pricing on our live inventory page at j5tractors.com, where our Conroe, Navasota, Normangee and Buna stores list the Cub Cadet mowers they have. Pricing depends on the model and how it's equipped, so check the listing for the PRO X 636, PRO X 648, PRO X 654 and PRO X 660 EFI. If the one you want isn't listed, call the store.
More Cub Cadet series
- Ultima Series Z42-54 in
- Ultima Series ZS42-60 in
- Ultima Series ZT42-60 in
- Ultima Series ZTX48-60 in
- Ultima Series ZTXS48-60 in
- PRO Z 700 Series54-60 in
- PRO Z 900 Series60-72 in
- PRO X 400 Series34-48 in
- PRO X 600 Series36-60 in
Cub Cadet pricing and inventory · Commercial Mowers · Mower Financing · Every series
