Danfoss FNR Installation guide

Service Kit Instructions

Series 90

FNR control installation procedures

This bulletin is intended to give instructions on assembling theFNRcontrolkit,emphasizingtheimportanceofthetank 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 includedandneedtobeinstalledbetweentheadapterplate and the solenoid valve assembly, as shown in the drawing. Thistankorificeisinstalledintothesolenoidvalveassembly 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.

ImportantNote: Iftankorificeisnotinstalledintothetank (or case drain) passage, the pressure limiter will not function properly. See SB-9305 for more details.

SomeFNR’sutilizeorificesinthe‘A’and/or‘B’passagesfor the purpose of stroking time in the application. Also, some FNRcontrolsutilizeapilotsupplyorifice/checkvalve,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 nomenclature 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 di cult 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. Remembertoincludethesealwasherifneeded.Torquethe 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).

Solenoid Valve

Assembly

Tank Orifice (included in kit)

A

B

Torque

4 ft lbs (5.4 Nm)

Seal Washer (Used on 30cc, 42cc,

	180cc, & 250cc)	P
	Torque	A	Tank Orifice
	12 ft lbs (16 Nm)
			T
			B
	Adapter Plate

Gasket

© Danfoss, 2014

BLN-10180 • Rev AA • Apr 2014

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