Danfoss EH Service guide

MAKING MODERN LIVING POSSIBLE
Service Manual
Steering Unit
EH Electro Proportional Hydraulic Valve In-line Version
powersolutions.danfoss.com
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Revision History Table of Revisions
Date Changed Rev
Jun 2010 First edition AA
2 L1026660 • Rev BA • Mar 2014
Service Manual EH Electro Proportional Hydraulic Valve In-line Version

Contents

Exploded view
Exploded view EH valve with dynamic orifice (no PVFC Spool)...................................................................................... 4
Exploded viev EH Valve with PVFC Spool................................................................................................................................5
Tools
Tools......................................................................................................................................................................................................6
Dismantling
Dismantling the EH valve.............................................................................................................................................................. 7
Preassembly
Inspection, cleaning and replacement...................................................................................................................................13
Cleaning.......................................................................................................................................................................................13
Inspection and replacement.................................................................................................................................................13
Lubrication..................................................................................................................................................................................13
Reassembly
Reassembly of the EH valve........................................................................................................................................................14
L1026660 • Rev BA • Mar 2014 3
17
3
5
6
7
8
6
13
1
16
2
15
14
11
10
9
12
4
5
16
18
P301 292
Service Manual EH Electro Proportional Hydraulic Valve In-line Version

Exploded view

Exploded view EH valve with dynamic orifice (no PVFC Spool)

Spare parts list
Spare parts Item Number per unit Torque setting Nm
Valve housing 1 1 ­Main spool 2 1 ­PVE 3 1 ­Plug 4 1 50 ± 5 Filter 5 2 ­O-ring 6 3 ­O-ring 7 1 ­O-ring 8 1 ­Spring 9 1 ­PR cone 10 1 ­PR spool 11 1 ­Plug 12 1 15 ± 2 Pilot cone and spring 13 1 ­Adjusting screw 14 1 ­Protection plug 15 1 ­Plug 16 2 15 ± 2 Screw 17 4 8 ± 0.5 Throttle screw 18 1 1 ± 0.1
4 L1026660 • Rev BA • Mar 2014
18
15
14
13
17
12
11
10
8
9
3
7
8
5
6
16
2
4
1
P301 293
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Exploded view

Exploded viev EH Valve with PVFC Spool

Spare parts list
Parts Item Number per unit Torque setting Nm
Valve housing 1 1 ­Main spool 2 1 ­PVE 3 1 ­Plug 4 1 50 ± 5 Filter 5 1 ­O-ring 6 3 ­O-ring 7 1 ­O-ring 8 1 ­Spring 9 1 ­PR cone 10 1 ­PR spool 11 1 ­Plug 12 1 ­Pilot cone and spring 13 1 ­Adjusting screw 14 1 ­Protection plug 15 1 ­Plug 16 1 15 ± 3 Screw 17 4 8 ± 0.5 PVFC spool 18 1 -
L1026660 • Rev BA • Mar 2014 5
Service Manual EH Electro Proportional Hydraulic Valve In-line Version

Tools

Tools

Open-ended spanner (or socket wrench) 27 mm
Hexagonal socket spanners 2.5 mm, 4 mm, 5 mm
Calibration Torque wrench
Small screw driver
Magnetized tool
O-ring pick or similar
3 mm threaded screw
Bench vise
Tools are not available from Danfoss
6 L1026660 • Rev BA • Mar 2014
Service Manual EH Electro Proportional Hydraulic Valve In-line Version

Dismantling

Dismantling the EH valve

Remove the 4 screws (17) and pull PVE (3) from the housing. (5 mm hexagon spanner).
Carefully pries lose the o-ring seals (6, 7, and 8) and Screen Mesh Filter (5) from PVE.
Fasten housing in a vice and remove the spool retainer plug (4) using a 27 mm spanner or socket wrench.
L1026660 • Rev BA • Mar 2014 7
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Dismantling
Remove spool (2) by holding the centering spring and pull out slowly.
Remove the PVFC spool retainer plug (16) using a 5 mm  Allan key.
This only applies to units with PVFC spool.
Insert a 3 mm threaded screw into the end of the PVFC spool (18) and use to remove the spool from the housing.
8 L1026660 • Rev BA • Mar 2014
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Dismantling
Screw out the pressure reducing valve plug (12) with a 5 mm  Allan key.
Remove the Pressure Reducing spool (11) from the cavity.
Remove the Pressure Reducing poppet (10) with a magnetized tool.
L1026660 • Rev BA • Mar 2014 9
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Dismantling
Remove the Pressure Reducing spring (9) with O­ring pick or similar.
Pries of the Pilot Relief Valve plastic protection cover (15) with a small screw driver or O-ring pick.
Then remove the Pilot Pressure relief valve adjusting screw (14) with a 5 mm  Allan key.
10 L1026660 • Rev BA • Mar 2014
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Dismantling
Remove Pilot Relief Valve poppet/spring unit (13). (Use O-ring pick or similar).
Screw out the Dynamic Orifice sealing plug (16) with a 5 mm  Allan key if it has been installed.
This only applies to units with dynamic orifice (i.e. units without PVFC spools).
Pries out the “screen mesh” filter (20) with a small pick or small screw driver.
This only applies to units with dynamic orifice (i.e. units without PVFC spools).
L1026660 • Rev BA • Mar 2014 11
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Dismantling
Remove the Load Sense orifice plug (21) with a 2.5 mm  Allan key.
This only applies to units with dynamic orifice (i.e. units without PVFC spools).
12 L1026660 • Rev BA • Mar 2014
Service Manual EH Electro Proportional Hydraulic Valve In-line Version

Preassembly

Inspection, cleaning and replacement

Cleaning

Clean all parts carefully in low aromatic kerosene.

Inspection and replacement

Check all parts carefully and make any replacements as necessary. All O-rings and screen filters must be replaced.

Lubrication

Before assembly, lubricate all parts with hydraulic oil.
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Service Manual EH Electro Proportional Hydraulic Valve In-line Version

Reassembly

Reassembly of the EH valve

If the EH valve has the PVFC spool (18) option, make sure it is lubricated with a thin film of oil. Carefully insert the spool (18) into the bore. Ensure that only minimal force is applied by your fingers.
Screw the PVFC retainer hexagonal plug (16) into the housing with a 5 mm  Allan key and tighten. Remember to lubricate the O-ring with light weight grease.
Make sure that the main directional spool (2) is lubricated with a thin film of oil. Carefully insert the spool (2) into the bore held by the spring end and ensure that only minimal force is applied by hand.
14 L1026660 • Rev BA • Mar 2014
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Reassembly
Mount the EH housing in a vice and screw the spool retainer plug (4) into the housing and tighten with 27 mm Torque wrench. Remember to lubricate the O-ring with a small amount of grease.
Insert PV poppet/spring unit (13) into the housing.
Then screw in PV pressure adjustment setting screw (14) with 5 mm  hexagon socket spanner. Make sure O-ring is lubricated.
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Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Reassembly
Press fit the plastic protection plug protection plug into the cavity. This will have to be done after the PV adjustment screw (14) is set to the required pressure on a test bench.
Insert the Pressure reducing spring (9) into the housing.
Then the PV poppet (10) must be inserted into the spring, stem end first.
16 L1026660 • Rev BA • Mar 2014
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Reassembly
Then insert the PR valve spool (11) ensuring that the end with the larger opening fits against the rounded head of the poppet (10). Remember to lubricate the spool first with a thin film of oil.
Screw in RP retaining plug (12) with 5 mm  Allan key. Make sure O-ring is lubricated.
If your EH valve has a dynamic orifice function then screw the plug (18) into housing with 2.5 mm  Allan key.
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Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Reassembly
Then insert replacement filter screen (5), dome side first.
Screw the dynamic orifice cover plug (16) into housing with 4 mm  Allan key.
Carefully place the “screen mesh” filter (5) dome first into the PVE housing, followed by the O-rings (6, 7 and 8).
Remember to use a light grade grease to keep the O-rings in place.
18 L1026660 • Rev BA • Mar 2014
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Reassembly
Mount the PVE (3) to EH housing with the four cap screws (17) and tighten with 5 mm  Allan key.
L1026660 • Rev BA • Mar 2014 19
Danfoss Power Solutions is a global manufacturer and supplier of high-quality hydraulic and
electronic components. We specialize in providing state-of-the-art technology and solutions that excel in the harsh operating conditions of the mobile off -highway market. Building on our extensive applications expertise, we work closely with our customers to ensure exceptional performance for a broad range of off -highway vehicles.
We help OEMs around the world speed up system development, reduce costs and bring vehicles to market faster. Danfoss – Your Strongest Partner in Mobile Hydraulics.
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L1026660 • Rev BA • Mar 2014 www.danfoss.com
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Danfoss A/S, 2014
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