Service Kit Instructions
Series 42
Loop flushing valve
PURPOSE:
The loop flushing consists of the loop flushing shuttle valve and the loop flushing relief valve. The assemblies may be removed for cleaning and installation of new O-rings. The relief valve poppet may be exchanged for one with a di erent flowrating.Sauer-Sundstrandstronglyrecommendsusingall new hardware include in the kit.
PROCEDURE:
Loop Flushing Valve
1.Remove the loop flushing valve plug from the pump
housing (1 1/16 in Hex). Remove the O-ring from the plug.
2.Remove the loop flushing valve spool assembly from the housing.
3.Inspect the parts for damage or foreign material. The centering spring must be securely retained to the spool by the washer.
4.Install the loop flushing valve spool assembly into its bore. Install a new O-ring on the loop flushing plug and torque to 27-37 Nm (20-35 ft•lbf).
Loop Flushing Relief Valve
1.Remove the loop flushing relief valve external hex plug ( 5/8 in Hex) from the pump housing. Remove the O-ring from the plug.
2.Remove the spring and poppet from the housing.
3.Remove and discard all shims which are found between the spring and valve plug.
4.Inspect the poppet and mating seat in the housing for damage or foreign material. Inspect the orifice in the valve poppet.
6. Install a new O-ring on the valve plug. Reinstall the poppet, spring, and plug (with O-ring) into the pump housing. Torque plug to 21-34 Nm (15-25 ft•lbf).
Note: There are two valve plugs in each kit. In order to determine which plug to use it is necessary to know thechargepressure.Ifthechargepressureisgreater than18bar,usetheplugwithtwoidentifyinggrooves. Ifthechargepressureislessthan18bar,usetheplug with one identifying groove.
Loop Flushing
Relief Plug
O-Ring
Spring
Poppet
Loop
Flushing Plug
O-Ring
Loop Flushing
Spool Assembly
Loop Flushing Valve Components
18 bar and above |
below 18 bar |
Relief Valve Plugs
© Danfoss, 2013 |
BLN-10121 • Rev AA • September 2013 |
1 |
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