All of these models were very similar.  All were based on a chassis with a mid-mount, reed valve motor (except JDX4 Special).  In 1973, all models had the bogie suspension/rubber track, while in  1974-1975 they used the new slide suspension/full width cleated track.  Most of the full width cleated tracks had issues, and were replaced with 2/3 cleated tracks.

Note: CCW and Kioritz are the same engine.  CCW (Canadian Curtis Wright) was the company that imported the engines to North America in the earlier years.  Starting in '74-'75 Deere bypassed them and used the manufacturer's name instead (Kioritz).  Kioritz is still in business making engines, and is associated with ECHO. 

Model Year 1973
TYPE CODE- JDX4B
Serial # Range: 2,551 - 20,000
Manufacture Dates: May to September 1972
Number Produced: 10353
Engine: Kohler K295-2AX
MSRP: $995
Specifications: 1973 JDX4

Model Year 1974 (Special)
TYPE CODE - JDX4C
Serial # Range: 20,001 - 30,000
Manufacture Dates: June to September, November 1973
Number Produced: 4533
Engine: CCW KEC-340/5
MSRP: $1295
Specifications: 1974 JDX4 Special
Notes: Switch from Salsbury to Comet clutch.  Switched from bogie to slide suspension.

Model Year 1975
TYPE CODE- JDX4D
Serial # Range: 30,001 - 55,000
Manufacture Dates:  July to November 1974, with a short run in February
Number Produced: 2180
Engine: Kioritz KEC-340/22A
MSRP: $1450
Specifications: 1975 JDX4
Notes: Styling & the fuel tank were updated for 1975.  The bumper & hood were updated, and the fuel tank changed from steel to polyurthane.


Model Year 1974
TYPE CODE- JDX6C
Serial # Range: 20,001 - 30,000
Manufacture Dates: June to November 1973
Number Produced: 5358
Engine: CCW KEC-400/22
MSRP: $1395
Specifications: 1974 JDX6

Model Year 1975
TYPE CODE- JDX6D
Serial # Range: 30,001 - 55,000
Manufacture Dates:  June, August, September 1974, with a short run in February
Number Produced: 1004
Engine: Kioritz KEC-400/22
MSRP: $1525
Specifications: 1975 JDX6
Notes: Styling & the fuel tank were updated for 1975.  The bumper & hood were updated, and the fuel tank changed from steel to polyurthane.

Model Year 1973
TYPE CODE- JDX8B
Serial # Range: 2,551 - 20,000
Manufacture Dates: June to November 1972
Number Produced: 10897
Engine: CCW KEC-440/21
MSRP: $1435
Specifications: 1973 JDX8

Model Year 1974
TYPE CODE- JDX8C
Serial # Range: 20,001 - 30,000
Manufacture Dates: June to November 1973
Number Produced: 4822
Engine: CCW KEC-440/22
MSRP: $1495
Specifications: 1974 JDX8
Notes: Switch from Salsbury to Comet clutch.  Switched from bogie to slide suspension.

Model Year 1975
TYPE CODE- JDX8D
Serial # Range: 30,001 - 55,000
Manufacture Dates: June to August 1974
Number Produced: 4133
Engine: Kioritz KEC-440/22A
MSRP: $1650
Specifications: 1975 JDX8
Notes: Styling & the fuel tank were updated for 1975.  The bumper & hood were updated, and the fuel tank changed from steel to polyurthane.  Came with a performance exhaust based on the 295/S.  An CDI conversion update kit was later added to most of the JDX8s to fix a plug-fouling issue, which consisted of a new stator, CDI box, and coils.