Offered here are new double-acting replacement control valves for the Bosch SB7 system, supplied as a complete set for easy retrofitting on a tractor.
The set is complete, as shown in the pictures. The valve fits a wide range of tractors and manufacturers and is compatible with all Bosch SB7 control valves. The valve can be switched between double-acting and single-acting operation.
This is a 5/4-way valve, like the original Bosch valves. It has the positions raise, neutral, lower, and float. The control valve can be switched between single-acting and double-acting operation using a grub screw on the back. The control valve has a hydraulic end-of-stroke shutoff on port A. This means that when the maximum pressure is reached, the control valve unlocks and automatically returns to the neutral position. This matches the function of the original SB7 control valves.
The raise (A) position is detented.
The lower (B) position is detented. Moving past the lower position engages the detented float position (consumer ports A and B are connected to each other and to the return line). The float position can be used as a detented lowering position with both double-acting and single-acting lift cylinders.
The control valve is easily integrated into the existing system using longer studs. The control valve has work ports on the bottom (as on the original) and on the top. The upper ports also allow it to be installed when there is little clearance near the steering knuckle.
It fits various tractor brands (list may be incomplete): IHC; Deutz; Fendt; Eicher; Schlüter; MB Trac; Güldner; Kramer; Lindner; Steyr; Porsche;