Danfoss OSPB, OSPC Service guide

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
May 2011 Drawing AC
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 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 off er 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.
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Krokamp 35 D-24539 Neumünster, Germany Phone: +49 4321 871 0
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2800 East 13th Street Ames, IA 50010, USA Phone: +1 515 239 6000
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Building #22, No. 1000 Jin Hai Rd Jin Qiao, Pudong New District Shanghai, China 201206 Phone: +86 21 3418 5200
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L1004933 • Rev BA • Mar 2014 www.danfoss.com
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