Danfoss Loop flushing valve Installation guide

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 diﬀerent ﬂow rating. Sauer-Sundstrand strongly recommends using all 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 Plug

O-Ring

Spring

Poppet

Loop

Flushing Plug

O-Ring

Loop Flushing

Spool Assembly

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 the charge pressure. If the charge pressure is greater than 18 bar, use the plug with two identifying grooves. If the charge pressure is less than 18 bar, use the plug with one identifying groove.

Loop Flushing Valve Components

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Relief Valve Plugs