Bosch Rexroth 25TE Tank mounted return line filter

The tank-mounted return line filter with filter element according to Bosch Rexroth standards is located in the return line for direct attachment onto the tank of a hydraulic or lubrication system. Optionally, the filter can also be installed as an inline filter in a pipeline.

The filter basically consists of a filter cover (1), filter housing (2), filter element (3), as well as a bypass valve (3c). Optionally, the filter is equipped with a maintenance indicator (4). With an electrical maintenance indicator, the connection can be carried out via different mating connectors (5).

If the filter is used as an inline filter, a threaded ring (6) must be configured with the order data - additional data “M” and a maintenance indicator waivered. If necessary, the customer must provide an external differential pressure measurement.

During operation, the hydraulic fluid reaches the filter housing via the inlet; here, it flows through the filter element (3a) from the outside to the inside and is cleaned according to the filter rating. The dirt particles filtered out collect in the dirt retainer (3b) and in the filter element (3a).

Via the outlet, the filtered hydraulic fluid enters the tank. When the element becomes fully contaminated, the required element change is signaled by the maintenance indicator (4 or 5).
There are several maintenance indicators to choose from :

• Mechanical visual maintenance indicator

• The electrical maintenance indicator with three possible mating connectors (mating connectors are to be ordered separately)

• Electrical maintenance indicator ATEX with pre-assembled mating connector

Refer to “Maintenance indicator” for details.

Feature :

• Filters for tank mounting and inline installation
• Special highly efficient filter media
• Filtration of very fine particles and high dirt holding capacity across a broad pressure differential range
• High collapse resistance of the filter elements
• Optional equipment with different back pressure indicator
• Bypass valve in the filter element
• Filter element with integrated dirt retainer

Specification :

General :

Type/version			25TE
Size			0101	0201	0351	1C051
Component series			2X
Ambient temperature range 1)			-10 … +65 °C
Storage conditions	NBR seal 2)		-40 ... +65 °C
	FKM seal 2)		-20 ... +65 °C
Installation position			vertical
Filtration direction			From the outside to the inside
Fatigue strength according to ISO 10771	Load cycles		> 10⁵ with max. operating pressure
Material	Filter cover		Grey cast iron			DucCtile iron
	Filter housing		Grey cast iron			Ductile iron
	Bypass valve		Plastic PA 6
	Seals		NBR / FKM
Weight			3 kg	5.8 kg	12 kg	21.5 kg
Volume			0.5 l	1 l	2.5 l	6.2 l
Surface requirement for tank opening	Roughness depth	Rz max.	25 µm
	Flatness	tE max.	200 µm

¹⁾short periods down to -30 °C
²⁾max. relative air humidity 65 %

Important information on hydraulic fluids!

• For further information and data on the use of other hydraulic fluids, please refer to data sheet 90220 or contact us!

• Flame-resistant – containing water: Due to possible chemical reactions with materials or surface coatings of machine and system components, the service life with these hydraulic fluids may be less than expected. Filter materials made of filter paper P must not be used, filter elements with glass fiber filter material are to be used instead.

• Bio-degradable: If filter materials made of filter paper are used, the filter life may be shorter than expected due to material incompatibility and swelling.

Hydraulic :

Type/version		25TE
Size		0101	0201	0351	1051
Max. operating pressure		25 bar
Cracking pressure	Bypass valve	3 ±0.3 bar
Hydraulic fluid temperature range		-10 … +100 °C
Minimum conductivity of the medium		300 pS/m
Filtration direction		From the outside to the inside

Compatibility with permitted hydraulic fluids :

Hydraulic fluid		Classification	Suitable sealing materials	Suitable adhesive	Standards
Mineral oil		HLP	NBR	Standard	DIN 51424
Bio-degradable	Insoluble in water	HETG	NBR		VDMA 24568
		HEES	FKM
	Soluble in water	HEPG	FKM		VDMA 24568
Flame-resistant	Water-free	HFDU, HFDR	FKM		VDMA 24317
	Containing water	HFAS	NBR		DIN 24320
		HFAE	NBR
		HFC	NBR		VDMA 24317
	Skydrol	‒	EPDM	Special “H”	‒

Important information on hydraulic fluids!

• For further information and data on the use of other hydraulic fluids, please refer to data sheet 90220 or contact us!

• Flame-resistant – containing water: Due to possible chemical reactions with materials or surface coatings of machine and system components, the service life with these hydraulic fluids may be less than expected. Filter materials made of filter paper P must not be used, filter elements with glass fiber filter material are to be used instead.

• Bio-degradable: If filter materials made of filter paper are used, the filter life may be shorter than expected due to material incompatibility and swelling.

Tightening torques: (Dimensions in mm)

Mounting filter cover :

Series 25TE		0101	0201	0351	1051
Screw cover fastening		M5 x 20	M8 x 20	M10 x 25	M16 x 25
Quantity		4
Recommended property class of screw		8.8
Tightening torque with μtotal = 0.14	Nm	6 ± 0,6	25 ± 2,5	50 ± 5,0	150 ± 15

Tank mounting :

Series 25TE		0101	0201	0351	1051
Tank mounting screw		M5	M6	M8	M12
Quantity		4
Recommended property class of screw		8.8
Tightening torque with μtotal = 0.14	Nm	7 ± 0,7	13 ± 1,3	18 ± 1,8	60 ± 6

Maintenance indicator :

Series 25TE		0101	0201	0351	1051
Mechanical/visual maintenance indicator	Nm	30 ± 3
Electric maintenance indicator; brass	Nm	max. 40
Electric maintenance indicator; stainless steel ATEX	Nm	max. 70
Cubic connector screw M3 switching element EN-175301-803	Nm	0,5 ... 0,6
Threaded coupling for venting	Nm	max. 40

Complete filter without maintenance indicator :

Use/assignment		II 2G	II 2D
Assignment		Ex II 2G c IIC TX	Ex II 2D c IIC TX
The conductivity of the medium	min.	300pS/m
Dust accumulation	max.	-	0.5 mm

Electronic maintenance indicator in the intrinsically safe electric circuit :

Use/assignment		II 1G	II 1D
Assignment		II 1GD Ex ia IIC TX°C X; II 1GD Ex ia IIIC TX°C X
Perm. intrinsically safe electric circuit		Ex ia IIC	Ex ia IIIC
Switching voltage Ui	max.	20 V AC/DC
Switching current Ii	max.	200 mA
Switching power Pi	max.	1 W
Maximum surface temperature		-	100 °C 1)
Inner capacity Ci		neglectable
Inner inductivity Li		neglectable
Dust accumulation	max.	-	0.5 mm

¹⁾The temperature depends on the temperature of the medium in the filter and must not exceed the value specified here.