M-SERIES OPTIONAL INTEGRAL RELIEF VALVE
An optional, integral pressure relief valve is offered with the Sheppard M-Series steering gear. The relief valve
cartridge is located in the bearing cap. The valve limits the maximum operating pressure in the steering system.
In most cases, the hydraulic supply pump will have a maximum relief pressure setting higher than the integral
relief valve in the steering gear.
When maximum relief pressures are reached in the steering system, the excess pressure is relieved within the steer-
When oil pressure exceeds the maximum relief pressure setting of the pilot-operated relief valve, the valve opens.
Excess pressure is bled off into the oil return circuit through the return port of the steering gear.
The relief valve cartridge can be removed for cleaning and inspection. Remove the relief valve nut and cartridge
assembly. At this time the strainer can also be cleaned and inspected.
The relief valve cartridge can not be disassembled and must be replaced if bad.
The O-rings and strainer are replaceable and are included as part of the complete seal kit.
Never use old seals or O-rings. Use the complete seal kit.
To install the relief valve cartridge in the bearing cap, insert the cartridge assembly into the relief valve bore
and torque the valve nut to 35 ft./lbs.