| | 1991 - 1995 |
| PowerStar 40 Series | | Utility tractor |
|
Series map:
5640
6640
7740
78.7hp
90.7hp
100.3hp
| Transmission options |
| 8-speed constant mesh |
| 16-speed two-speed power shift |
| 12-speed synchronized |
| 16-speed four-speed power shift |
| Transmission |
| Transmission | EconoShift
|
| Type | constant mesh
|
| Gears | 8 forward and 2 reverse
|
| Clutch | dry disc
|
| Oil capacity | 69.6 qts
65.9 L
|
| Four gears (1-4), plus reverse, in two ranges (L/H). Optional creeper provided a third range. Tractor must be stopped and clutch used to shift gears or range. The eight-speed transmission was only used on the 6640S. |
| Speeds |
| With 16.9-34 rear tires. |
|
| Transmission |
| Transmission | Dual Power
|
| Type | two-speed power shift
|
| Gears | 16 forward and 4 reverse
|
| Clutch | dry disc
|
| Oil capacity | 69.6 qts
65.9 L
|
| Dual Power adds a two-speed power shift between direct drive and the lower Dual Power range to the basic eight-speed transmission. The Dual Power range is engaged by a switch on the dashboard. Dual Power was an option on the 6640S. |
| Speeds |
| With 16.9-34 rear tires. |
|
| Transmission |
| Transmission | SynchroShift
|
| Type | synchronized
|
| Gears | 12 forward and reverse
|
| Clutch | dry disc
|
| Four gears (1-4) in three ranges (L/M/H) with right-hand shuttle lever. Gear shifts are synchronized. Shifts between medium and high ranges are synchronized, but the tractor should be stopped to shift to or from low range. Synchronized shuttle shifting. The 12-speed SynchroShift was standard on the 6640 SL. Dual power was an option with the SynchroShift, turning it into a 24-speed transmission. |
| Speeds |
| With 16.9-38 rear tires. |
|
| Shift Pattern |
 |
| Transmission |
| Transmission | ElectroShift/Pulse Command
|
| Type | four-speed power shift
|
| Gears | 16 forward and reverse
|
| Clutch | wet disc
|
| Oil capacity | 64 qts
60.6 L
|
| Four power shift gears arranged in two synchronized ratio groups (1-4 and 5-8). Two synchronized ranges (low/high) and right-hand shuttle. Clutch must be used to shift range or move between the lower (1-4) and higher (5-8) gear ratio groups. Push-button power shifting between the four gears in a ratio group. Push-button de-clutching on the shuttle lever allow shifting without the foot clutch. The 16 power shift was standard on the 6640 SLE. |
| Speeds |
| With 16.9-38 rear tires. |
|
| Shift Pattern |
 |
| Page information |
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| TractorData is a family-owned small business located in Minnesota that has been providing reference information on tractors since 1999. |
| Peter Easterlund - owner/author |
| Email: Peter@TractorData.com |
| Updated on June 2, 2023 |
©2000-2024 - TractorData.com®. Notice: Every attempt is made to ensure the data listed
is accurate. However, differences between sources, incomplete listings,
errors, and data entry mistakes do occur.
Consult official
literature from the manufacturer before attempting any service or repair.
