Our topic today is Relief Valves for Sundstrand Sauer Danfoss Series 40 M46

Charge Check and High Pressure Relief Valves

Take off the charge check and high pressure relief valve hex plug.

Next to come off is the spring and check poppet or valve cartridge from the housing. Inspect the valve and mating seat in the housing for damage or foreign material. If the seat is damaged, you will need to replace the housing.

Several designs of charge check and high pressure relief valves have been used. Don’t attempt to mix the new with the old.

When replacing ball type charge check valves with the poppet type.

The valve poppet or cartridge, spring, plug and main housing were changed at date code 87-40 and are not individually interchangeable with newer parts.

Reinstall the valve cartridge, spring and plug (with oring) into the housing. Torque the plug to 30-70 ft.lbsf (41-95 Nm).

Charge Pressure Relief Valves

Take off the charge relief valve hex plug.

The spring and poppet come off from the housing. Don’t alter the shims or interchange parts with another valve. Make sure there is not  dust or dirt on the parts.

Reinstall with  poppet, spring and plug (with shims and Oring) into the housing. Torque the plug to 30-70 ft.lbs (41-95 Nm).

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