Danfoss S42 P Installation guide

Brand: Danfoss

Model: S42 P

Type: Installation guide

Danfoss S42 P is a loop flushing valve kit designed for cleaning and maintaining hydraulic pumps. It enables easy removal and installation of the loop flushing shuttle valve and relief valve, allowing for thorough cleaning and replacement of O-rings. The kit includes all necessary hardware for a complete repair, ensuring optimal performance of your hydraulic system.

Danfoss S42 P is a loop flushing valve kit designed for cleaning and maintaining hydraulic pumps. It enables easy removal and installation of the loop flushing shuttle valve and relief valve, allowing for thorough cleaning and replacement of O-rings. The kit includes all necessary hardware for a complete repair, ensuring optimal performance of your hydraulic system.

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 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

Relief Valve Plugs

rab 81 wolebevoba dna rab 81

Spring

Poppet

O-Ring

O-Ring

Loop

Flushing Plug

Loop Flushing

Spool Assembly

Loop Flushing

Relief Plug

© Danfoss, 2013 BLN-10121 • Rev AA • September 2013 1

Service Kit Instructions

Series 42

Loop ﬂushing valve

1

Danfoss S42 P Installation guide

Brand: Danfoss

Model: S42 P

Type: Installation guide

Danfoss S42 P is a loop flushing valve kit designed for cleaning and maintaining hydraulic pumps. It enables easy removal and installation of the loop flushing shuttle valve and relief valve, allowing for thorough cleaning and replacement of O-rings. The kit includes all necessary hardware for a complete repair, ensuring optimal performance of your hydraulic system.

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