Danfoss OSPU Service guide
Service Manual
Steering Unit
OSPU
powersolutions.danfoss.com
Service Manual
Steering Unit OSPU
Revision history Table of revisions
Date Changed Rev
April 2017 Updated LS copy valve 0102
September 2014 First edition AA
2 | © Danfoss | April 2017 L1412234 | AX00000142en-US0102
Service Manual
Steering Unit OSPU
Contents
Safety
Safety precautions............................................................................................................................................................................4
Symbols
Symbols used in Danfoss Literature.......................................................................................................................................... 5
Exploded view and seal kit
OSPU exploded view.......................................................................................................................................................................6
OSPU parts list................................................................................................................................................................................... 6
Seal kit for OSPU............................................................................................................................................................................... 7
Tools
Tools for OSPU...................................................................................................................................................................................8
Dismantling
Dismantling OSPU......................................................................................................................................................................... 10
Assembling
Assembling OSPU.......................................................................................................................................................................... 17
Tightening torques for connections
Tightening torques........................................................................................................................................................................27
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Service Manual
Steering Unit OSPU
Safety
Safety precautions
Always consider safety precautions before beginning a service procedure. Protect yourself and others
from injury. Take the following general precautions whenever servicing a hydraulic system.
Warning
Unintended vehicle or machine movement hazard.
Unintended movement of the machine or mechanism may cause injury to the technican or bystanders.
To prevent uintended movement, secure the machine or disable/disconnect the mechanism while
servicing.
Warning
Flammable cleaning solvents
Some cleaning solvents are flammable. To eliminate the risk of fire, do not use cleaning solvents in an
area where a source of ignition may be present.
Warning
Fluid under pressure
Escaping hydraulic fluid under pressure can have sufficient force to penetrate your skin causing serious
injury and/or infection. This fluid may also be hot enough to cause burns. Use caution when dealing with
hydraulic fluid under pressure. Relieve pressure in the system before removing hoses, fittings, gauges, or
components. Never use your hand or any other body part to check for leaks in a pressurized line. Seek
medical attention immediately if you are cut by hydraulic fluid.
Warning
Personal safety
Protect yourself from injury. Use proper safety equipment, including safety glasses at all times.
Warning
Product safety
Steering units are safety components and therefore it is extremely important that the greatest care is
taken when servicing these products. There is not much wear on a steering unit and therefore they
normally outlast the application they are built into. Therefore the only recommended service work on
steering units is:
•
Changing shaft seals and O-rings
•
Disassemble, clean and assemble if contaminated
•
Make hydraulic testing including valve setting.
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Service Manual
Steering Unit OSPU
Symbols
Symbols used in Danfoss Literature
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•
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•
•
•
•
•
•
•
The symbols above appear in the illustrations and text of this manual. They are intended to
communicate helpful information at the point where it is most useful to the reader. In most instances,
the appearance of the symbol itself denotes its meaning. The legend above defines each symbol and
explains its purpose.
= Non removable part, use a new part
= External hex head
= Internal hex head
= Lubricate with hydraulic fluid
= Inspect for wear or damage
= Note correct orientation
= Mark orientation for reinstallation
= Torque specification
= Press in - press fit
= Pull out with tool - press fit
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25
40
41
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26
27
28
33
34
3
4
10
7
2
11
12
37
18
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13
16
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24
35
30
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43
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46
53
P301 762
Service Manual
Steering Unit OSPU
Exploded view and seal kit
OSPU exploded view
OSPU parts list
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OSPU parts list
Parts list Num. per unit Item Tigtening
Dust seal ring 1 1 Housing & spool/sleeve set 1 2 Ball Ø8.5 mm 1 3 Threaded bushing (Screw below surface of housing) 1 4 Shaft seal 1 5 Bearing assembly 1 7 Ring 1 10 Cross pin 1 11 Set of springs 1 12 Cardan shaft 1 13 Distributor plate 1 16 Gearwheel set 1 17 O-ring ø79.4 x ø2.0 mm 3 18 End cover 1 19 Washer 7 20 -
torque
Service Manual
Steering Unit OSPU
Exploded view and seal kit
OSPU parts list (continued)
Parts list Num. per unit Item Tigtening
torque
Pin bolt screw 1 21 30±6 N•m
Screw 6 22 30±6 N•m
Model/Code label 1 24 Adjusting screw for shock valve 2 25 Spring with thrust pad for shock valve 2 26 Ball ø3/16 in for shock valve 2 27 Seat for shock valve 2 28 6+0/-1 N•m
Adjusting screw for relief valve 1 30 Spring for relief valve 1 31 Piston for relief valve 1 32 Ball Ø3/16 in for suction valve 2 33 Bushing with pin for suction valve 2 34 LS copy valve 1 35 Check valve 1 37 25±5 N•m
O-ring ø9.0 x ø1.5 mm 2 40 O-ring ø6.0 x ø1.5 mm 2 41 O-ring ø12.42 x ø1.78 mm 1 43 O-ring ø15.3 x ø2.2 mm 1 44 O-ring ø12.5 x ø1.8 mm 1 45 O-ring ø9.5 x ø1.0 mm 1 46 Torque compensator valve plug 1 50 Torque compensator valve spring 1 51 Torque compensator valve spool 1 52 Torque compensator valve ball, Ø13.0 mm 1 53 -
Seal kit for OSPU
Seal kit, Danfoss code 11140740 is valid for all codes of OSPU's.
Spare part kit for OSPU, code no. 11140740
Parts list Number per spare part kit Item
Dust seal ring 1 1
Shaft seal 1 5
O-ring 3 18
Washer 7 20
O-ring 2 40
O-ring 2 41
O-ring 1 43
O-ring 1 44
O-ring 1 45
O-ring 1 46
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90±1
ø46±0.5
120±2
2xø15±0.1
5±1
20±1
150±2
100±2
7x51.4°
ø64
7xø15+0.5/-0
1x45°
P301 644
0.5x45°
ø26±0.1
min ø40
min 35
100±5
P301 643
Service Manual
Steering Unit OSPU
Tools
Tools for OSPU
Tools
Holding tool for the entire steering unit.
Material: Appropriate metal or hard plastic.
This tool is not available from Danfoss.
Assembly tool for dust seal.
Material: Free cutting steel.
This tool is not available from Danfoss.
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Service Manual
Steering Unit OSPU
Tools
Tools (continued)
Assembly tool for shaft seal, O-ring/Roto Glyd type:
Code number: 11092408.
Torque wrench 0 - 70 N•m.
13 mm socket spanner.
2.75 - 5 and 8 mm Allan key.
12 mm screwdriver.
2 mm screwdriver.
13 mm ring spanner.
Plastic hammer.
Tweezers.
These tools are not available from Danfoss.
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