Danfoss EH Series User manual

MAKING MODERN LIVING POSSIBLE
Service Manual
Steering Unit
EH Electro Proportional
Hydraulic Valve In-line Version
powersolutions.danfoss.com

Revision History Table of Revisions
Date Changed Rev
Mar 2014 Converted to Danfoss layout - DITA CMS BA
Sep 2010 New back cover AB
Jun 2010 First edition AA
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
2L1026660 • Rev BA • Mar 2014

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
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Contents
L1026660 • Rev BA • Mar 2014 3

Exploded view EH valve with dynamic orifice (no PVFC Spool)
17
3
5678
6
13
1
16 2
15
14
11
10
9
12 4
5
16
18
P301 292
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
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Exploded view
4L1026660 • Rev BA • Mar 2014

Exploded viev EH Valve with PVFC Spool
18
15
14
13
17
12
11
10
8
9
3
78
56
16 2
4
1
P301 293
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 -
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Exploded view
L1026660 • Rev BA • Mar 2014 5

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
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Tools
6L1026660 • Rev BA • Mar 2014

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.
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Dismantling
L1026660 • Rev BA • Mar 2014 7

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.
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Dismantling
8L1026660 • Rev BA • Mar 2014

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.
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Dismantling
L1026660 • Rev BA • Mar 2014 9

Remove the Pressure Reducing spring (9) with O-
ring 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.
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Dismantling
10 L1026660 • Rev BA • Mar 2014

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).
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Dismantling
L1026660 • Rev BA • Mar 2014 11

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).
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Dismantling
12 L1026660 • Rev BA • Mar 2014

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.
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Preassembly
L1026660 • Rev BA • Mar 2014 13

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.
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Reassembly
14 L1026660 • Rev BA • Mar 2014

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.
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Reassembly
L1026660 • Rev BA • Mar 2014 15

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.
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Reassembly
16 L1026660 • Rev BA • Mar 2014

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.
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Reassembly
L1026660 • Rev BA • Mar 2014 17

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.
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Reassembly
18 L1026660 • Rev BA • Mar 2014

Mount the PVE (3) to EH housing with the four cap
screws (17) and tighten with 5 mm  Allan key.
Service Manual EH Electro Proportional Hydraulic Valve In-line Version
Reassembly
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.
Go to www.powersolutions.danfoss.com for further product information.
Wherever off-highway vehicles are at work, so is Danfoss.
We offer expert worldwide support for our customers, ensuring the best possible solutions for
outstanding performance. And with an extensive network of Global Service Partners, we also provide
comprehensive global service for all of our components.
Please contact the Danfoss Power Solution representative nearest you.
Local address:
Danfoss
Power Solutions GmbH & Co. OHG
Krokamp 35
D-24539 Neumünster, Germany
Phone: [phone]
Danfoss
Power Solutions ApS
Nordborgvej 81
DK-6430 Nordborg, Denmark
Phone: [phone]
Danfoss
Power Solutions US Company
2800 East 13th Street
Ames, IA 50010, USA
Phone: [phone]
Danfoss
Power Solutions
(Shanghai) Co. Ltd.
Building #22, No. 1000 Jin Hai Rd
Jin Qiao, Pudong New District
Shanghai, China 201206
Phone: [phone]
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to
products already on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed.
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L1026660 • Rev BA • Mar 2014 www.danfoss.com ©Danfoss A/S, 2014
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