Quick Answer
The correct PTO clutch for a gasoline-powered Cub Cadet Ultima ZT1 42 depends on the mower’s complete 11-character model number and whether it has the stamped or fabricated 42-inch deck.
The stamped-deck models 17AREACS010, 17AREACSA10, 17AIEACSA10, and 17RIEACS010 use the 917-05121 PTO clutch, which replaces OEM number 717-05121.
The fabricated-deck ZT1 42 FAB models 17AREACEA10, 17AIEACEA10, 17RIEACE010, and 17BIEACEA10 use the 917-05209 PTO clutch, which replaces OEM number 717-05209.
The confirmed 42-inch mower-deck belt path is 754P06134. The original 17AREACS010 deck uses six-point-star blades and 918-04822B spindles. The later stamped and fabricated deck paths use S-center blades and 618P09260 spindles.
This guide is limited to the exact gasoline-powered model numbers shown below. Do not select a clutch using the ZT1 42 name or deck width alone.
Cub Cadet ZT1 42 PTO Clutch Table
Table tip: On mobile, swipe sideways to view the full fitment table.
| Model Name | Model Number | Deck Type | OEM PTO Clutch | Previous OEM Number | PTO Direct Product | Fitment Note |
|---|---|---|---|---|---|---|
| Cub Cadet Ultima ZT1 42 | 17AREACS010 | 42-inch stamped deck | 917-05121 | 717-05121 | 917-05121 PTO Clutch | Original stamped-deck model using the six-point-star blade and 918-04822B spindle path. |
| Cub Cadet Ultima ZT1 42 | 17AREACSA10 | 42-inch stamped deck | 917-05121 | 717-05121 | 917-05121 PTO Clutch | Later stamped-deck model using the S-center blade and 618P09260 spindle path. |
| Cub Cadet Ultima ZT1 42 | 17AIEACSA10 | 42-inch stamped deck | 917-05121 | 717-05121 | 917-05121 PTO Clutch | Kawasaki-powered stamped-deck model using the later S-center blade system. |
| Cub Cadet Ultima ZT1 42 | 17RIEACS010 | 42-inch stamped deck | 917-05121 | 717-05121 | 917-05121 PTO Clutch | Later Kawasaki-powered stamped-deck model using the S-center blade system. |
| Cub Cadet Ultima ZT1 42 FAB | 17AREACEA10 | 42-inch fabricated deck | 917-05209 | 717-05209 | 917-05209 PTO Clutch | Kohler-powered fabricated-deck model. Do not substitute the stamped-deck 917-05121 clutch. |
| Cub Cadet Ultima ZT1 42 FAB | 17AIEACEA10 | 42-inch fabricated deck | 917-05209 | 717-05209 | 917-05209 PTO Clutch | Kawasaki-powered AeroForce fabricated-deck model using the 917-05209 clutch path. |
| Cub Cadet Ultima ZT1 42 FAB | 17RIEACE010 | 42-inch fabricated deck | 917-05209 | 717-05209 | 917-05209 PTO Clutch | Kawasaki-powered fabricated-deck model using the later S-center deck-parts path. |
| Cub Cadet Ultima ZT1 42 FAB | 17BIEACEA10 | 42-inch fabricated deck | 917-05209 | 717-05209 | 917-05209 PTO Clutch | Later fabricated-deck model using the 917-05209 clutch and S-center deck system. |
Cub Cadet ZT1 42 Deck Parts Table
Table tip: On mobile, swipe sideways to view the full deck parts table.
| Model Path | Component | Quantity | OEM Part Number Path | PTO Direct Product | Fitment Note |
|---|---|---|---|---|---|
| All model numbers listed in this guide | 42-Inch Mower-Deck Belt | 1 | 754P06134 Replaces 754-06134 and 490-501-C081 |
Contact to inquire about product | This is the mower-deck belt. Do not confuse it with hydrostatic transmission belt 954-04317A. |
| Original stamped-deck model 17AREACS010 | Six-Point-Star Blade | 2 | 942-04312A / 942-04308A | 942-04312A / 942-04308A Replacement Mower Blades | Uses a six-point-star center hole. Cub Cadet’s current replacement family includes 942-04308A. |
| Original stamped-deck model 17AREACS010 | Star-Shaft Spindle Assembly | 2 | 918-04822B | 918-04822B Spindle Assembly | Uses a star-pattern spindle shaft and must be matched with six-point-star blades. |
| Later stamped and all FAB models listed above | S-Center High-Lift Blade | 2 | 742P05528 | Contact to inquire about product | Uses an S-shaped center hole. This blade belongs to the later 618P09260 spindle system. |
| Later stamped and all FAB models listed above | S-Center Xtreme Blade | 2 | 742P05177A-X | 742P05177A-X Xtreme Mower Blades | Optional Xtreme blade for the later S-center spindle system. |
| Later stamped and all FAB models listed above | S-Center Spindle Assembly | 2 | 618P09260 | Contact to inquire about product | Uses an S-pattern blade shaft. Do not substitute the earlier star-shaft 918-04822B spindle. |
Stamped Deck Versus Fabricated Deck
The 917-05121 and 917-05209 clutch paths are not interchangeable selections based only on the ZT1 42 name.
The four stamped-deck models listed in this guide use 917-05121. The four ZT1 42 FAB models use 917-05209. Confirm the complete model number from the mower identification label before ordering.
Blade and Spindle Production Change
Original model 17AREACS010 uses the six-point-star blade system with 918-04822B spindles. Its original blade number is 942-04312A, with 942-04308A in the current replacement family.
The later stamped-deck models and all fabricated-deck models in this guide use the S-center system. The standard blade path is 742P05528, the Xtreme option is 742P05177A-X, and the matching spindle is 618P09260.
Do not mix six-point-star blades or spindles with S-center blades or spindles.
Before Ordering
- Confirm the complete 11-character mower model number from the identification label.
- Use 917-05121 only for stamped-deck models 17AREACS010, 17AREACSA10, 17AIEACSA10, and 17RIEACS010.
- Use 917-05209 only for fabricated-deck models 17AREACEA10, 17AIEACEA10, 17RIEACE010, and 17BIEACEA10.
- Use 754P06134 for the confirmed 42-inch mower-deck belt path.
- Do not mistake transmission belt 954-04317A for the mower-deck belt.
- Inspect the original blade center hole before ordering blades or spindle assemblies.
- Use star-center blades with 918-04822B spindles only on original model 17AREACS010.
- Use S-center blades with 618P09260 spindles on the later stamped and fabricated models.
- Do not order a PTO clutch using only the ZT1 42 name or 42-inch deck width.
- Do not use this guide for the battery-powered Cub Cadet ZT1 42E.
Common Symptoms
- Blades will not engage when the PTO switch is pulled
- PTO clutch clicks but the deck belt does not begin turning
- Blades engage when cold but stop after the mower warms up
- PTO clutch slips or produces a burning smell
- Mower-deck belt squeals, slips, or repeatedly jumps off
- Blade center hole does not seat correctly on the spindle shaft
- Spindle bearings produce grinding noise or excessive vibration
- Uneven cut quality caused by worn blades or spindle assemblies
FAQ
What PTO clutch fits Cub Cadet ZT1 42 model 17AREACS010?
Model 17AREACS010 uses the 917-05121 PTO clutch. It does not use 917-05209.
Which Cub Cadet ZT1 42 models use PTO clutch 917-05121?
The confirmed stamped-deck models are 17AREACS010, 17AREACSA10, 17AIEACSA10, and 17RIEACS010.
Which Cub Cadet ZT1 42 models use PTO clutch 917-05209?
The confirmed fabricated-deck models are 17AREACEA10, 17AIEACEA10, 17RIEACE010, and 17BIEACEA10.
What does Cub Cadet PTO clutch 917-05121 replace?
The 917-05121 PTO clutch replaces previous OEM number 717-05121.
What does Cub Cadet PTO clutch 917-05209 replace?
The 917-05209 PTO clutch replaces previous OEM number 717-05209.
Can I replace a 917-05121 clutch with a 917-05209 clutch?
No. These are separate OEM clutch paths used on different ZT1 42 model families. Match the clutch to the mower’s complete 11-character model number.
What mower-deck belt fits the Cub Cadet ZT1 42 models in this guide?
The confirmed 42-inch mower-deck belt path is 754P06134. It replaces previous numbers including 754-06134 and packaged belt number 490-501-C081.
Is 954-04317A the mower-deck belt?
No. Part number 954-04317A is a hydrostatic transmission drive belt. It is not the belt driven by the PTO clutch for the mower deck.
What blades and spindles fit original model 17AREACS010?
Original model 17AREACS010 uses two six-point-star blades in the 942-04312A / 942-04308A replacement family and two 918-04822B spindle assemblies.
What blades and spindles fit the later ZT1 42 models?
The later stamped and fabricated deck paths use two 742P05528 S-center blades and two 618P09260 spindle assemblies. The 742P05177A-X Xtreme blade is the matching Xtreme option.
Can I install an S-center blade on a 918-04822B spindle?
No. The 918-04822B spindle has a star-pattern shaft. Use it only with the matching six-point-star blade system.
Can I replace a 618P09260 spindle with a 918-04822B spindle?
No. The two spindle systems use different blade-shaft patterns and must not be mixed.
Does this guide include the Cub Cadet ZT1 42E?
No. The ZT1 42E is battery powered and does not use either gasoline-engine electric PTO clutch path covered in this guide.
Is there one deck kit that fits every Cub Cadet ZT1 42?
No. The blade and spindle system changed during production. Confirm whether the mower uses the original six-point-star system or the later S-center system before ordering deck parts.