The John Deere 66 tractor hydraulic pump flow is 21 GPM, and hydraulic system pressure is 2,901 psi.
Hydraulic pump flow21 GPM
Implement flow21.4 GPM
Total hydraulic flow21.4 GPM
Hydraulic pressure2,901 psi
Hydraulic system typeopen-center
Hydraulic fluid capacity100 qt (25 gal)
John Deere 66 Hydraulic Flow Details
Hydraulic pump flow
21 GPM
Implement hydraulic flow
21.4 GPM
Total hydraulic flow
21.4 GPM
Hydraulic system pressure
2,901 psi
Hydraulic system type
open-center
Hydraulic fluid capacity
100 qt (25 gal)
Hydraulic Flow Comparison Chart
Hydraulic pump flow comparison
This model
21 GPM
Average
20.7 GPM
Low
3.7 GPM
High
110 GPM
Implement hydraulic flow comparison
This model
21.4 GPM
Average
21.2 GPM
Low
3.7 GPM
High
110 GPM
Total hydraulic flow comparison
This model
21.4 GPM
Average
19.9 GPM
Low
3.7 GPM
High
55 GPM
Hydraulic pressure comparison
This model
2,901 psi
Average
2,198.4 psi
Low
700 psi
High
4,200 psi
Hydraulic fluid capacity comparison
This model
25 gal
Average
12.1 gal
Low
1.2 gal
High
55 gal
John Deere 66 Extra Hydraulic Notes
Hydraulic flow note
The John Deere 66 should be matched to implements that fit its 21.4 GPM hydraulic-flow range.
Hydraulic pressure note
The John Deere 66’s hydraulic pressure is listed at 2,901 psi, which is strong tractor hydraulic pressure; flow still decides attachment speed while pressure affects force.
Rear remotes / SCV note
Rear remotes / SCVs depend on the tractor’s hydraulic package and options.
For hydraulic implements, match the implement to the available hydraulic flow (21.4 GPM), not just the number of remotes.
Check the operator manual or hydraulic package because SCV count can change by year, market and trim package.
Hydraulic system type note
System type matters on the John Deere 66: open-center affects how hydraulic flow and pressure are delivered to valves and implements.
Hydraulic fluid capacity note
For maintenance, the John Deere 66’s hydraulic fluid capacity matters more than flow rate because it affects oil changes, filter service and refill quantity.
Official information note
Mistakes do happen. Hydraulic flow, pump flow, implement flow, pressure, rear remote / SCV setup and fluid capacity can change by year, market, transmission, pump option, loader package and hydraulic package. Please check the operator manual and official deere.com website for official information.
