Danfoss S90 P Installation guide

Brand: Danfoss

Model: S90 P

Type: Installation guide

Danfoss S90 P: Enhance Your Hydraulic System's Control and Efficiency

The Danfoss S90 P is a versatile and reliable FNR (forward-neutral-reverse) control assembly designed to provide precise and smooth directional changes in hydraulic systems. Engineered for durability and performance, this device offers several notable features and potential use cases:

Accurate Directional Control: The S90 P enables precise and responsive directional changes in hydraulic systems, ensuring smooth operation and enhanced productivity.
Pressure Limiter: Equipped with a pressure limiter, the S90 P safeguards your hydraulic system by preventing excessive pressure buildup, protecting components and extending their lifespan.

Danfoss S90 P: Enhance Your Hydraulic System's Control and Efficiency

Accurate Directional Control: The S90 P enables precise and responsive directional changes in hydraulic systems, ensuring smooth operation and enhanced productivity.
Pressure Limiter: Equipped with a pressure limiter, the S90 P safeguards your hydraulic system by preventing excessive pressure buildup, protecting components and extending their lifespan.

This bulletin is intended to give instructions on assembling

the FNR control kit, emphasizing the importance of the tank

oriﬁce, and installing the FNR control assembly onto the

Series 90 housing.

Note:

The seal washer included in the kit is not used on

all Series 90 displacements. It is only used on the

30cc, 42cc, 180cc, and 250cc displacements. It is

intended to seal the bolt hole passage, due to the

design of these displacements. The location of the

seal is shown in the drawing.

PROCEDURE:

Assembling the FNR control kit:

The location of the control passages are noted on the

drawings. ‘P’ is the pilot passage. ‘T’ is the tank (or case

drain) passage. ‘A’ and ‘B’ are the servo control passages

for the respective servos. All FNR’s have the tank oriﬁce

included and need to be installed between the adapter plate

and the solenoid valve assembly, as shown in the drawing.

This tank oriﬁce is installed into the solenoid valve assembly

ﬁrst, then the O-ring is installed over the oriﬁce, as shown.

Then install the other three O-rings into the solenoid valve

assembly as shown in the picture.

Important Note:

If tank oriﬁce is not installed into the tank

(or case drain) passage, the pressure limiter will

not function properly. See SB-9305 for more de-

tails.

Some FNR’s utilize oriﬁces in the ‘A’ and/or ‘B’ passages for

the purpose of stroking time in the application. Also, some

FNR controls utilize a pilot supply oriﬁce/check valve, which

is located on the bottom side of the adapter plate (pump

housing side). These oriﬁces are not included in this kit. If

they are needed, the “Oriﬁce Group” section of the nomen-

clature would call these items out.

Installing the FNR Control Assembly:

The adapter plate must be installed onto the housing ﬁrst.

If the solenoid valve assembly is assembled onto the

adapter plate ﬁrst, it will be diﬃcult to get the mounting

screws installed and torque them.

Place the gasket onto the housing. Then place the adapter

plate into position and install the six mounting screws.

Remember to include the seal washer if needed. Torque the

screws to 16 Nm (12 ft•lbf).

Install the solenoid valve assembly onto the adapter plate.

Install the four screws and torque to 5.4 Nm (4 ft•lbf).

Seal Washer

(Used on 30cc, 42cc,

180cc, & 250cc)

Tank Oriﬁce

(included in kit)

Tank Oriﬁce

Torque

4 ft lbs (5.4 Nm)

Torque

12 ft lbs (16 Nm)

Gasket

Adapter Plate

Solenoid Valve

Assembly

Series 90

FNR control installation procedures

BLN-10180 • Rev AA • Apr 2014

Service Kit Instructions

Danfoss S90 P Installation guide

Brand: Danfoss

Model: S90 P

Type: Installation guide

Danfoss S90 P: Enhance Your Hydraulic System's Control and Efficiency

Accurate Directional Control: The S90 P enables precise and responsive directional changes in hydraulic systems, ensuring smooth operation and enhanced productivity.
Pressure Limiter: Equipped with a pressure limiter, the S90 P safeguards your hydraulic system by preventing excessive pressure buildup, protecting components and extending their lifespan.

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Danfoss S90 P Installation guide

Danfoss S90 P Installation guide

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