MAKING MODERN LIVING POSSIBLE
Service Manual
Steering Unit
Type OSPB and OSPC Type ON
and CN
powersolutions.danfoss.com
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Revision History Table of Revisions
Date Changed Rev
Mar 2014 Converted to Danfoss layout - DITA CMS BA
May 2011 Drawing AC
Sep 2010 New back cover AB
May 2010 First edition AA
2 L1004933 • Rev BA • Mar 2014
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Contents
Exploded view
Exploded view OSPB....................................................................................................................................................................... 4
Exploded view OSPC....................................................................................................................................................................... 5
Dismantling
Tools......................................................................................................................................................................................................7
Dismantling the pressure relief valve for OSPC.....................................................................................................................8
Dismantling the shock valve for OSPC...................................................................................................................................10
Dismantling......................................................................................................................................................................................12
Cleaning............................................................................................................................................................................................ 17
Lubrication....................................................................................................................................................................................... 17
Inspection and Replacement.....................................................................................................................................................17
Assembling
Assembling of spool and sleeve set........................................................................................................................................18
Installation instruction for Roto Glyd Seal............................................................................................................................ 21
Assembling.......................................................................................................................................................................................23
Assembly of the pressure relief valve for OSPC.................................................................................................................. 28
Assembly of the shock valves for OSPC................................................................................................................................. 29
L1004933 • Rev BA • Mar 2014 3
1
5
3
4
2
6
7
8
10
9
11
12
13
11
14
15
16
17
18
P301 267
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Exploded view
Exploded view OSPB
Exploded view OSPB callouts
Callout Description Callout Description
1
2
3
4
5
6
7
8
9
Dust Seal Ring
Housing + Spool + Sleeve
Check Valve Ball (∅8.5 mm )
Threaded Bushing
Roto-glyd Shaft Seal
Thrust Bearing Assembly (3 pcs.)
Retainer Ring
Cross Pin (∅ 6 x 41 mm)
Neutral Spring Kit (4, 6 or 8 pcs.)
10
11
12
13
14
15
16
17
18
Cardan Shaft
O-ring Seal (3 pcs., 79.4 x 2 mm)
Distributor plate
Gear Wheel Set
End Cover Plate
Sealing Washer (7 pcs., 8.2 x 15.2 x 1.0)
Pin Bolt Screw
Screw (6 pcs.)
Model/Code Label
4 L1004933 • Rev BA • Mar 2014
34
35
36
16
15
14
P301 336
11
13
12
11
10
17
18
2
8
9
7
31
32
33
37
5
6
3
4
1
23
21
22
20
19
30
29
28
27
26
24
25
30
29
28
27
26
24
25
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Exploded view
Exploded view OSPC
Exploded view OSPC callouts
Callout Description Callout Description
1
2
3
4
5
6
7
8
9
10
11
12
13
Dust Seal Ring
Housing + Spool + Sleeve
Check Valve Ball (∅8.5 mm )
Threaded Bushing
Roto-glyd Shaft Seal
Thrust Bearing Assembly (3 pcs.)
Retainer Ring
Cross Pin (∅ 6 x 41 mm)
Neutral Spring Kit (4, 6 or 8 pcs.)
Cardan Shaft
O-ring Seal (3 pcs. ∅79.4 x 2 mm)
Distributor plate
Gear Wheel Set
20
21
22
23
24
25
26
27
28
29
30
31
32
Relief Valve Spring
O-ring seal (1 pc. ∅14.3 x 2.4mm)
Relief Valve Adjustment Screw
Plastic Plug
Shock Valve Seat (2 pcs.)
O-ring (2 pcs. ∅6 x 1.5mm)
Shock Valve Ball (2 pcs. ∅3/16”)
Shock Valve Spring (2 pcs.)
Shock Valve Adjustment Screw (2 pcs.)
O-ring (2 pcs. ∅9 x 1.5mm)
Plastic Plug
Suction Valve Ball (2 pcs. ∅3/16”)
Suction Valve Spring (2 pcs.)
L1004933 • Rev BA • Mar 2014 5
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Exploded view
Exploded view OSPC callouts (continued)
Callout Description Callout Description
14
15
16
17
18
19
End Cover Plate
Sealing Washer
(7 pcs. ∅8.2 x 2 x 1.0mm)
Pin Bolt Screw
Screw (6 pcs.)
Model/Code Label
Relief Valve Piston
33
34
35
36
37
Suction Valve Retainer Pin
Gear Wheel Set with Seal Star
Seal Star O-ring (1 pc.)
Seal Star PTFE Ring (1 pc.)
Check Valve in the P port
6 L1004933 • Rev BA • Mar 2014
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Dismantling
Tools
Holding tool.
Code number: SJ 150-9000-2
Assembly tool for O-ring and kin-ring / Roto Glyd.
Code number: SJ 150-9000-11.
Code number: SJ: SJ 150N4014-1
Assembly tool for dust seal.
Code number: SJ 150-9000-22
L1004933 • Rev BA • Mar 2014 7
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Dismantling
Torque wrench 0 - 70 Nm.
13 mm socket spanner.
2.75 - 5, 6 and 8 mm Allan key.
12 mm screwdriver.
2 mm [0.08 in] screwdriver.
13 mm ring spanner.
Plastic hammer.
Tweezers.
The tools are not available from Danfoss.
Dismantling the pressure relief valve for OSPC
First remove plastic plug (23).
Screw out the adjustment screw (22) using an 8 mm
hexagon socket spanner.
8 L1004933 • Rev BA • Mar 2014
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Dismantling
Remove the relief valve spring (20).
Remove the piston as shown (19).
The pressure relief valve is now dismantled.
L1004933 • Rev BA • Mar 2014 9
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Dismantling
Dismantling the shock valve for OSPC
Prise off the plastic protection plugs (30) from the two
shock valves.
Remove pressure adjustment screws (29) using a 5
mm hexagon socket spanner.
Remove the two shock valve springs (27).
10 L1004933 • Rev BA • Mar 2014
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Dismantling
Remove the shock valve balls (26).
Removed the shock valve seats with 2.75 mm Allan
key (25).
The shock valves are now dismantled.
L1004933 • Rev BA • Mar 2014 11
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Dismantling
Dismantling
Place the steering unit in the holding tool.
Remove the 6 screws (17) and the special pin bolt
(16) from the end cover plate.
Remove the end cover (14), sideways.
Lift the gearwheel set (13) off the unit.
Remove the two O-rings (11).
12 L1004933 • Rev BA • Mar 2014
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Dismantling
Remove the cardan shaft (10).
Remove distributor plate (12).
Screw out the threaded bush (4) retaining the
check valve ball (3).
L1004933 • Rev BA • Mar 2014 13
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Dismantling
Remove O-rings (11).
OSPB:
Shake out the check valve ball (3)
(∅8.5 mm)
OSPC:
Shake out the check valve ball (3) and suction valve
pins (33) and balls (31).
On some pins in the OSPC there are two springs (see
page 4, pos. 32).
Place the housing with the ports facing down on
the work bench. Ensure that the cross pin (8) in the
spool and sleeve set (2) is in the horizontal
position. The pin (8) can be observed through the
open end of the spool. Press the spool (2) inwards
(from the housing mounting face end) and the
sleeve (2), ring (7) and bearing assembly (6) will be
pushed out of the housing together.
14 L1004933 • Rev BA • Mar 2014
C
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Dismantling
Take the ring (7), bearing races and needle bearing
(6) from the spool and sleeve set (2). The outer
bearing (6) race can sometimes “stick” in the
housing, therefore check that it has come out.
Press out the cross pin (8). Use the special screw
from the end cover (16).
Note next point/paragraph!
OSPB CN and OSPC CN
A small mark has been made on both spool and
sleeve close to one of the slots for the neutral
position springs.
Caution
If the mark is not visible, remember to leave a mark of
your own on sleeve and spool before the neutral position
springs are dismantled.
L1004933 • Rev BA • Mar 2014 15
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Dismantling
Carefully press the spool out of the sleeve.
Press the neutral position springs (9) out of the slot
in the spool.
Remove dust seal (1) and Roto Glyd Seal (5)
carefully with a screw driver or similar tool.
16 L1004933 • Rev BA • Mar 2014
Service Manual
Dismantling
Cleaning
Lubrication
Inspection and Replacement
Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
The steering unit OSPB and OSPC is now
completely dismantled.
Clean all parts carefully in Shellsol K or similar cleaner fluid.
Before assembly, lubricate all parts with hydraulic oil.
Replace all seals and washers.
Check all parts carefully and make any replacements as is necessary.
L1004933 • Rev BA • Mar 2014 17
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Assembling
Assembling of spool and sleeve set
Place the two flat neutral position springs in the
slot.
Place the curved springs between the flat ones and
press them into place.
Configuration of spring set (9).
Line up the spring set (9).
18 L1004933 • Rev BA • Mar 2014
C
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Assembling
Guide the spool into the sleeve (2), and making
sure the centering springs (9) are placed into the
slot.
Caution
OSPB CN and OSPC CN
Assemble the spool/sleeve (2) and make sure the marks
on spool and sleeve (2) aligne with each other
Line up the springs (9) and centre them.
L1004933 • Rev BA • Mar 2014 19
C
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Assembling
Guide the ring (7) down over the sleeve.
The ring should be able to move - free of springs.
Fit the cross pin (8) into the spool/sleeve.
Fit bearing races and needle bearing (6)as shown
on the drawing below.
Caution
Assembly pattern for standard bearing
1 Outer bearing race
2 Needlebearing
3 Inner bearing race
4 Spool
5 Sleeve
20 L1004933 • Rev BA • Mar 2014
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Assembling
* The inside chamfer on the inner bearing race must face the inner spool.
Installation instruction for Roto Glyd Seal
Place the steering unit housing with the port face down
on the work bench. Guide the outer part of the assembly
tool into the bore for the spool/sleeve set (2).
Grease Roto Glyd (5) with hydraulic oil and place
them on the tool. Ensure that the Roto Glyd seal is
placed on the insertion tool as per the photograph.
Hold the outer part of the assembly tool in the
bottom of the steering unit housing and guide the
inner part of the tool right to the bottom.
L1004933 • Rev BA • Mar 2014 21
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Assembling
Press and turn the Roro Glyd seal (5) into position
in the housing.
Draw the inner and outer parts of the assembly
tool out of the steering unit bore, leaving the guide
from the inner part in the bore.
With a light turning movement, guide the spool
and sleeve into the bore.
Fit the spool set holding the cross pin (8) horizontal.
22 L1004933 • Rev BA • Mar 2014
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Assembling
The spool set will push out the assembly tool
guide. The Roto Glyd Seals (5) are now installed.
Assembling
Turn the stearing unit until the bore is vertical again. Put
the check valve ball (3)into the hole indicated by the
arrow.
Screw the threaded bush (4) lightly into the check
valve bore. The top of the bush must lie just below
the surface of the housing.
L1004933 • Rev BA • Mar 2014 23
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Assembling
Place a ball (31) in the two bolt holes indicated by
the arrows
F301 712
Place the pins (33) in the same two bolt holes.
In some cases a spring (32) has to be fitted on the
pin before it is placed in the housing.
24 L1004933 • Rev BA • Mar 2014
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Assembling
Grease the o-ring (11) with mineral oil approx.
viscosity 500 mm² [SUS] at 20°C [68 °F].
Insert the o-ring in the grove on the housing.
Place the distributor plate (12) so that the channel
holes match the holes in the housing.
Guide the cardan shaft (10) down into the bore so
that the slot is parallel with the connection flange
ports and lines up with the cross pin (8).
L1004933 • Rev BA • Mar 2014 25
C
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Assembling
Grease the two o-rings with mineral oil approx.
viscosity 500 mm² [SUS] at 20°C [°F] and place them
in the two groves in the gear rim. Fit the gearwheel
and rim (13) on the cardan shaft (10).
Caution
Fit the gearwheel (rotor) and cardan shaft so that a tooth
base in the rotor is positioned in relation to the shaft slot
as shown. Turn the gear rim so that the seven through
holes match the holes in the housing.
Place the end cover (14) in position. Ensure that the
bar codes and writing are parallel with port face.
26 L1004933 • Rev BA • Mar 2014
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Assembling
Fit the special screw (16) with washer (15) and
place it in the hole shown.
Fit the six screws (17) with new washers (15) and
insert them.
Cross-tighten all the screws (17) and the rolled pin
(16) with a torque of 30 +/-6 N.m [265.5 +/- 53
lbf.in].
The OSPB/C can now be function tested manually.
Place the dust seal ring in the housing.
L1004933 • Rev BA • Mar 2014 27
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Assembling
Fit the dust seal ring in the housing using special
tool SJ 150-9000-22 (see page 5) and a plastic
hammer.
Screw the plastic plugs into the connection ports.
Assembly of the pressure relief valve for OSPC
Install the piston (19) to housing.
28 L1004933 • Rev BA • Mar 2014
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Assembling
Install the spring (20) on top of the piston (19).
Screw in the adjustment screw (21) with an 8 mm
hexagon socket spanner.
Make the pressure setting on a test panel or the
vehicle as required.
Reinsert plastic protection plug (23) to the
adjustment screw (21).
Assembly of the shock valves for OSPC
Screw the shock valve seats (24) with a 2.75 mm Allan key
into the cavities indicated by the arrows. Torque to 1.5
Nm.
L1004933 • Rev BA • Mar 2014 29
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Assembling
Place one ball (26) in each of the shock valve
cavities.
Place springs valve cones (27) over the two balls.
The copper coated spring applies to a setting range
90-190 bar [1305-2755 psi]. The black spring applies to a
setting range 180-240 bar [2610-3480 psi].
Screw in the two setting screws (28) using a 5 mm
Allan key. Make the pressure setting on a panel
description.
30 L1004933 • Rev BA • Mar 2014
Service Manual Hydrostatic Steering Unit Type OSPB and OSPC Type ON and CN
Assembling
Insert plastic plug (30) into the 5 mm internal hex.
L1004933 • Rev BA • Mar 2014 31
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
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Go to www.powersolutions.danfoss.com for further product information.
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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.
Danfoss
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Krokamp 35
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Phone: +49 4321 871 0
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DK-6430 Nordborg, Denmark
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Phone: +86 21 3418 5200
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