Hydraulics, rear selective control valves (SCVs)
Matching applications to hydraulic performance expectations is easy with John Deere hydraulics.
 
Equipment for base machine

  • 6230-6430 Open Operator Station (OOS) and Cab Tractors—single basic SCV (no detent - 101 Series) with standard couplers
  • 6230-6430 Premium Tractors—two standard SCV (2 detent - 200 Series) with deluxe couplers
  • 7130-7330 OOS and Cab Tractors—single basic SCV (no detent - 101 Series) with standard couplers
  • 7130-7530 Premium Tractors—two deluxe mechanical SCVs (3 detents - 300 Series) with deluxe couplers

Valves are located at the rear of the tractor and positioned parallel to one another. The valves are repositioned permitting increased drawbar visibility over previous models.
Rear SCV (base) for 6030 and 7030 Standard

Rear SCV (base) for 6030 and 7030 Standard

Rear SCV (base) for 6030 Premium and 7030 Premium

Rear SCV (base) for 6030 Premium and 7030 Premium

SCV position for 6030 and 7030 Tractors
 
Base SCV position

Base SCV position

The position of the one SCV valve that comes in base equipment for 6030 and 7030 Standard Tractors is in position 1, closest to the hydraulic block on the left-hand size.
 
Positions of additional SCVs

Positions of additional SCVs

The more SCVs that are ordered or added change the position of the SCV valves. The SCV positions read from left to right. The maximum number of rear-mounted SCVs is four.
 
Positions 1 and 2 are located on the left-hand side of the hydraulic block, with positions 3 and 4 located on the right. (Four rear SCV valves are available on premium models only.)
SCV configuration options
 
There are many different SCV configurations one can choose when ordering a John Deere utility tractor. Ordering codes differ in detent type (either 100, 200, or 300), type of coupler (standard or deluxe), and how many SCV valves come on the rear of the tractor.
100 Series - No detent
 
100 Series valve

100 Series valve

The 100 Series SCVs have detent in raise, lower, and float. The SCV will hold in detent until it's moved to neutral.
  • Four-position lever control with detent setup from the factory
  • Maximum flow up to 21 gpm
200 Series - 2 detent
 
200 Series valve

200 Series valve

1. Flow control
2. No detent
3. Continuous hydraulic motor
 
In addition to the features of the 100 Series mechanical valve, the 200 Series valve features:
  • Maximum flow infinitely adjustable [1] from 0 gpm to 29 gpm (only up to 21 gpm with the small pump)
  • Selectable detents allow switching between no detent (ideal for loader operation) [2] and mechanical detent (for continuous hydraulic motor operation) [3]
 
300 Series - 3 detent
 
300 Series valve

300 Series valve

4. Pressure controlled
 
In addition to the features of 200 Series mechanical SCVs, the 300 Series SCVs feature:
  • Maximum flow infinitely adjustable from 0 gpm to 29 gpm (only up to 21 gpm with the small pump)
  • Temperature-compensated adjustable flow continuously regulates the flow of oil between zero and maximum in both directions, regardless of oil temperature (this will give daylong constant speed operation of hydraulic motors without the need for adjustment)
  • Selectable hydraulic detent [4]—the SCV lever will remain engaged until a preset pressure is reached; it will then automatically kick out to the neutral position (this mode is particularly useful when repeated SCV operations are performed, such as turning a plough or drill marker cycling)


Flow control:
  • The control dial is located in the SCV and can be reached from the operator's seat by opening the rear window
  • It can be adjusted while oil is flowing
  • The load check valve on the lower port prevents loader and implement linkage creep
  • Flow rates can be adjusted from 0 gpm to 29 gpm, with reduced flow if more than one SCV is operated at the same time

Learn more about 3-detent electronic SCV control.

Standard vs. deluxe couplers
 
Standard couplers

Standard couplers

Deluxe couplers

Deluxe couplers

The standard coupler allows coupling and uncoupling of hydraulics with pressure from the implement side.
The deluxe coupler allows coupling and uncoupling of hydraulics with pressure from the tractor and/or implement side.
 
Mechanical vs. electrical
 
Mechanical (M-SCV) hydraulic features and options
 
Electronic (E-SCV) hydraulic features and options
 
Last Updated : 25-Aug-2011