Bosch Rexroth SB23 Manuale utente

Repair instructions

RE 66133-10-R/05.2013

Replaces:

66130-10-R

66130-11-R

66132-10-R

66132-11-R

66134-10-R

English

Control valves SB23, SB33

Hitch control valves EHR23,

EHR33

Control block assembly

The data speciﬁed below only serve to describe

the product. Any information with regard to

use only refers to application examples and

recommendations. Data available in catalogs

are no guaranteed characteristics. The

information given does not exempt the user

from making own evaluations and tests. Our

products are subject to a natural process of

wear and aging.

speciﬁcations and other information set forth in

it, are the exclusive property of Bosch Rexroth

AG. It may not be reproduced or given to third

parties without its consent.

The cover shows an example conﬁguration. The

product supplied may therefore diﬀer from the

photo shown.

The original repair instructions were prepared

inGerman.

RE 66133-10-R/05.2013, SB23, SB33, EHR23, EHR33, Bosch Rexroth AG

3/16Contents

Contents

1 About this documentation 4

1.1 Validity of the documentation 4

1.2 Required and supplementary documentation 4

2 Safety instructions 5

3 General repair instructions 5

4 About this product 5

5 Assembly description 6

5.1 General instructions for the assembly 6

5.2 Control block disassembly 6

5.3 Control block assembly 8

5.3.1 Subplate assembly 9

5.3.2 Control valve and hitch control valve assembly 9

5.3.3 End plate assembly 10

5.4 Flange surface sealing element repair 11

5.4.1 Sealing elements for LS control blocks 11

5.5 Shuttle valve repair 13

5.6 Coupling ﬂange seals repair 14

4/16 About this documentation

Bosch Rexroth AG, SB23, SB33, EHR23, EHR33, RE 66133-10-R/05.2013

1 About this documentation

1.1 Validity of the documentation

These repair instructions apply to the following products:

•Control valves SB23-M, SB23-EHS, SB23-EHS1, SB33-EHS1, SB33-EHS2

•Hitch control valves EHR23-EM2, EHR33-EHS1, EHR33-EHS2

▶ Read this documentation completely and in particular chapter 2 “Safety

instructions” and chapter 3 “General instructions on damage to equipment and

the product” in the basic documentation, before working with the product.

1.2 Required and supplementary documentation

▶ Only start works at the product when you have been provided with the

documentation marked with the book symbol and you have understood and

observed it.

Table 1: Required and supplementary documentation

Title Document number Document type

Control block SB23, SB33

Contains the necessary basic information for assembly and repair

66133-01-R Repair instructions

Related documentation is available in the instructions speciﬁed above and also

from www.boschrexroth.com/mobile-hydraulics-catalog, if necessary.

Safety instructions 5/16

RE 66133-10-R/05.2013, SB23, SB33, EHR23, EHR33, Bosch Rexroth AG

2 Safety instructions

Please observe all safety instructions of the basic documentation 66133-01-R at all

times.

3 General repair instructions

General repair instructions are contained in the basic documentation 66133-01-R.

4 About this product

Information on the identiﬁcation and product description is contained in the basic

documentation 66133-01-R.

6/16 Assembly description

Bosch Rexroth AG, SB23, SB33, EHR23, EHR33, RE 66133-10-R/05.2013

5 Assembly description

5.1 General instructions for the assembly

Generally valid instructions are contained in the basic documentation 66133-01-R.

Disassembly and assembly is described using a control block with dummy block

segments with three tie rods.

The procedure for valves with ﬁve tie rods are the same.

Table 2: Dummy overview

Subplate

-KP, -VP

EHR valve

-EM2, -EHS1, -EHS2

SB valve

-M, -EHS1, -EHS2

End plate

-LS, -EHS

5.2 Control block disassembly

•Torque wrench with socket SW13mm

▶ Disassemble the control block according to the vehicle manufacturer’s instruction

and put it down on a clean and stable surface.

▶ Pull the electric plug-in connections.

▶ Separately numerate the control block segments.

1. Loosen the nuts at the tie rods , and by turning them counterclockwise

and screw them oﬀ.

Similarly, for valves with ﬁve tie rods the nuts to .

2. Pull oﬀ the end plate via the tie rods.

Tool

Preparation

End plate disassembly

Assembly description 7/16

RE 66133-10-R/05.2013, SB23, SB33, EHR23, EHR33, Bosch Rexroth AG

Fig. 1: End plate disassembly

1. Remove spacers that might be available from the tie rod screws.

The spacers are only used in case of repair. See also chapter5.3.2 on page9.

2. Pull oﬀ the control block segments via the tie rods.

Fig. 2: Control block segment disassembly

1. Loosen the tie rods , and by turning them counterclockwise and screw

them out of the subplate.

Similarly, for valves with ﬁve tie rods the tie rods to .

Fig. 3: Subplate disassembly

Control block segment

disassembly

Subplate disassembly

8/16 Assembly description

Bosch Rexroth AG, SB23, SB33, EHR23, EHR33, RE 66133-10-R/05.2013

5.3 Control block assembly

•Torque wrench for 30 Nm with socket SW13mm

For control blocks in EHS version with continuous pilot oil bores Rx and R,

control block segments are needed with O-ring counterbore for the pilot oil

bores.

The O-ring counterbores are designed with diﬀerent diameters of the respective

following block segment.

For certain block combinations there are versions with O-ring counterbores

without continuous pilot oil bores.

If the control block segment ﬂange surface shows punching marks which have

been processed by means of a whetstone, a spacer must be threaded on the

tie rod screws , and (or to ). (In case of an Open Center control

block the spacer is threaded only on tie rod .)

Tool

Assembly description 9/16

RE 66133-10-R/05.2013, SB23, SB33, EHR23, EHR33, Bosch Rexroth AG

5.3.1 Subplate assembly

1. Only use original M8 tie rods by Rexroth (property class 10.9).

2. Screw in the tie rod screws to (or to ) manually to the ground by

rotating them clockwise.

3. Assemble the sealing elements according to chapter 5.4.

4. If necessary, install spacers on the tie rods.

Fig. 4: Subplate assembly

5.3.2 Control valve and hitch control valve assembly

Ideal is the ﬁrst position after the subplate.

A maximum of three SB valves should be ﬂanged between the Yport of the subplate

and the EHR valve.

1. Assemble the shuttle valve according to chapter 5.5.

2. Assemble the sealing elements according to chapter 5.4.

3. If necessary, install spacers on the tie rods.

4. Push the EHR valve over the tie rods according to the speciﬁed order, with the

opposite ﬂange O-ring side pointing at the subplate.

Fig. 5: EHR valve assembly

EHR hitch control valve

assembly

10/16 Assembly description

Bosch Rexroth AG, SB23, SB33, EHR23, EHR33, RE 66133-10-R/05.2013

1. Assemble the shuttle valve according to chapter 5.5.

2. Assemble the sealing elements according to chapter 5.4.

3. If necessary, install spacers on the tie rods.

4. Push the SB valves over the tie rods according to the speciﬁed order, with the

opposite ﬂange O-ring side pointing at the subplate.

Fig. 6: SB valve assembly

5.3.3 End plate assembly

1. Push the end plate over the tie rods to the stop with the ﬂange surface pointing

at the control block.

2. Screw the nuts without washers and/or locking washers onto the tie rod screws

manually by turning them clockwise.

3. Align the control block segments so that they face each other.

4. Preload the nuts with a torque of 5+1 Nm.

5. Tighten the nuts applying a torque wrench by turning the clockwise.

Tightening order ( with ﬁve tie rods, see Fig. 9).

Tightening torque MA= 25.5+2.5 Nm.

Fig. 7: End plate assembly

SB valve assembly

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