Danfoss VSPP Manuale utente
Revision history Table of revisions
Date Changed Rev
November 2019 First edition 0101
Service Manual
VSPP Steering unit
2 | ©Danfoss | November 2019 AX319758618681en-000101
Safety precautions Safety precautions............................................................................................................................................................................4
VSPP version overview VSPP versions.....................................................................................................................................................................................5
Exploded view, VSPP.......................................................................................................................................................................5
Parts list, VSPP....................................................................................................................................................................................5
Seal kit for VSPP.................................................................................................................................................................................7
Required tools....................................................................................................................................................................................7
VSPP holding tool....................................................................................................................................................................... 7
Assembly tool for dust seal......................................................................................................................................................8
Assembly tool for shaft sea, O-ring / RotoGlyd type...................................................................................................... 8
Additional tools needed...........................................................................................................................................................9
VSPP disassembly Remove shock and relief valves from housing....................................................................................................................11
Remove priority valve parts and P-check from housing..................................................................................................12
Priority valve parts and P-check details............................................................................................................................13
Remove end cover, gear set, cardan shaft, distributor plate, O-rings and valves from gear set end of
housing......................................................................................................................................................................................15
Remove spool/sleeve set from housing................................................................................................................................ 17
Disassemble spool/sleeve set and remove dust seal and shaft from housing........................................................18
VSPP maintenance Cleaning............................................................................................................................................................................................ 19
Inspection and replacement......................................................................................................................................................19
VSPP assembly Assemble spool/sleeve set......................................................................................................................................................... 20
Assemble shaft seal and spool/sleeve set to housing......................................................................................................23
Assemble valve parts, O-rings, distributor plate, cardan shaft, gear set, and end cover to gear set
end of housing........................................................................................................................................................................ 26
Assemble priority valve parts and P-check to housing....................................................................................................28
Assemble shock and relief valves, and dust seal, to housing.........................................................................................29
Assembly details for shock and relief valves, and dust seal......................................................................................30
Testing of VSPP Set-up for testing........................................................................................................................................................................... 32
Shock valves.....................................................................................................................................................................................33
Steering tests...................................................................................................................................................................................33
Start up test......................................................................................................................................................................................33
Pilot relief valve test......................................................................................................................................................................33
Neutral positioning test...............................................................................................................................................................34
Check for external leakage......................................................................................................................................................... 34
Tightening torques for connections
Tightening torques for connections....................................................................................................................................... 35
Service Manual
VSPP Steering unit
Contents
©Danfoss | November 2019 AX319758618681en-000101 | 3
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.
W
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.
W
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.
W
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.
W
Warning
Personal safety
Protect yourself from injury. Use proper safety equipment, including safety glasses at all times.
W
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.
Service Manual
VSPP Steering unit
Safety precautions
4 | ©Danfoss | November 2019 AX319758618681en-000101
VSPP versions
VSPP is only available as “Load Sensing dynamic, non-reaction” version.
The exploded view is universal. Some variants are without shock and suction valves.
Exploded view, VSPP
VSPP exploded view
Parts list, VSPP
Item Description Number per
unit
Tightening torque
1 Spool/sleeve set 1 -
2 Housing 1 -
4 Threaded bushing (Screw below surface of
housing) 1 -
5 Ball Ø6.0 mm 1 -
6 O-ring Ø79.4 x Ø2.0 mm 1 -
7 Shaft seal 1 -
9 Dust seal ring 1 -
10 Orifice, LS 1 1 ± 0.1 N•m [8.9 ± 0.9 lbf•in]
12 Cross pin 1 -
13 Cardan shaft 1 -
14 Set of springs 1 -
Service Manual
VSPP Steering unit
VSPP version overview
©Danfoss | November 2019 AX319758618681en-000101 | 5
Item Description Number per
unit
Tightening torque
16 Ring 1 -
17 Bearing assembly 1 -
21 Spool, priority valve with orifices 1 -
21.1 Spool 1 -
21.2 Orifice, PP 1 1 ± 0.1 N•m [8.9 ± 0.9 lbf•in]
21.3 Orifice, Dynamic 1 3.5 ± 0.5 N•m [31 ± 4.4 lbf•in]
23 Compression spring 1 -
24 Plug with O-ring 1 40 ± 10 N•m [354 ± 88 lbf•in]
24.1 Plug 1 -
24.2 O-ring Ø15.3 x Ø2.4 mm 1 -
25 Plug with O-ring 1 40 ± 10 N•m [354 ± 88 lbf•in]
25.1 Plug 1 -
25.2 O-ring Ø15.3 x Ø2.4 mm 1 -
30 Gearwheel set 1 -
31 Screw 6 30 ± 6 N•m [265 ± 52 lbf•in]
32 Pin bolt screw 1 30 ± 6 N•m [265 ± 52 lbf•in]
34 Distributor plate 1 -
35 Washer 7 -
36 End cover 1 -
37 Model/Code label 1 -
39 O-ring Ø79.4 x Ø2.0 mm 2 -
61 Ball Ø3/16” 2 -
62 Spring with thrust pad for shock valve 2 -
63 Valve seat for shock valve with O-ring 2 6 +0/-1 N•m [59 +0/- 8.9 lbf•in]
63.1 Valve seat for shock 2 -
63.2 O-ring Ø6 x Ø1,5 mm 2 -
64 Adjusting screw for shock valve
with O-ring
2 -
64.1 Adjusting screw 2 -
64.2 O-ring Ø9 x Ø1,5 mm 2 -
75 Plug with O-ring 1 20 ± 5 N•m [177 ± 44 lbf•in]
80 Pin 2 -
81 Ball Ø3/16” 2 -
85 Valve cone, P-check 1 -
86 Compression spring 1 -
87 Screw with O-ring 1 20 ± 5 N•m [177 ± 44 lbf•in]
87.1 Screw 1 -
87.2 O-ring Ø9 x Ø1,5 mm 1 -
90 Valve seat for pilot relief 1 20 ± 3 N•m [177 ± 27 lbf•in]
95 Spring with cone for pilot relief valve 1 -
99 Adjusting screw for pilot relief valve
with O-ring
1 -
99.1 Adjusting screw 1 -
99.2 O-ring Ø9 x Ø2.0 mm 1 -
172 Pin bolt screw for LS check 1 1 ± 0.1 N•m [8.9 ± 0.9 lbf•in]
173 Ball Ø3,5 mm 1 -
Service Manual
VSPP Steering unit
VSPP version overview
6 | ©Danfoss | November 2019 AX319758618681en-000101
Seal kit for VSPP
Spare parts list Code number Item
Seal kit for VSPP 150N4038 6, 7, 9, 24.2, 25.2, 35, 39, 63.2, 64.2,
87.2, 99.2
Required tools
VSPP holding tool
Holding tool dimensions drawing
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
•Material: Appropriate metal or hard plastic.
•This tool is not available from Danfoss.
Service Manual
VSPP Steering unit
VSPP version overview
©Danfoss | November 2019 AX319758618681en-000101 | 7
Assembly tool for dust seal
Assembly tool for dust seal
0.5x45°
ø26±0.1
min ø40
min 35
100±5
P301 643
•Material: Free cutting steel.
•This tool is not available from Danfoss
Assembly tool for shaft sea, O-ring / RotoGlyd type
Assembly tool for shaft seal, O-ring / Roto Glyd type
•Code number: 11092408.
Service Manual
VSPP Steering unit
VSPP version overview
8 | ©Danfoss | November 2019 AX319758618681en-000101
Additional tools needed
These tools are not available from Danfoss:
Additional tools needed
•Torque wrench, 0-70 Nm
•Socket spanner for external hexagon: 6, 13, and 22 mm
•Hex keys for internal hexagon: 2, 2.75, 3, 5, 6, and 8 mm
•Screwdrivers: 2 and 12 mm
•Incide circlip pliers
•Magnetic rod
•Hook of max 2mm wire
•Multigrip pliers
•Plastic hammer
Service Manual
VSPP Steering unit
VSPP version overview
©Danfoss | November 2019 AX319758618681en-000101 | 9
To disassemble VSPP Steering Unit, follow these steps.
Place the unit on the holding tool on the gear set end.
VSPP Steering Unit mounted on holding tool
Service Manual
VSPP Steering unit
VSPP disassembly
10 | ©Danfoss | November 2019 AX319758618681en-000101
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