Danfoss VSPP Service guide
Service Manual
Steering unit
VSPP
www.danfoss.com
Service Manual
VSPP Steering unit
Revision history Table of revisions
Date Changed Rev
November 2019 First edition 0101
2 | © Danfoss | November 2019 AX319758618681en-000101
Service Manual
VSPP Steering unit
Contents
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
©
Danfoss | November 2019 AX319758618681en-000101 | 3
W
W
W
W
W
Service Manual
VSPP Steering unit
Safety precautions
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.
•
4 | © Danfoss | November 2019 AX319758618681en-000101
Service Manual
VSPP Steering unit
VSPP version overview
VSPP versions
Exploded view, VSPP
VSPP exploded view
VSPP is only available as “Load Sensing dynamic, non-reaction” version.
The exploded view is universal. Some variants are without shock and suction valves.
Parts list, VSPP
Item Description
1 Spool/sleeve set 1 2 Housing 1 4 Threaded bushing (Screw below surface of
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 -
©
Danfoss | November 2019 AX319758618681en-000101 | 5
housing)
Number per
unit
1 -
Tightening torque
Service Manual
VSPP Steering unit
VSPP version overview
Item Description
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
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
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 -
Adjusting screw for shock valve
with O-ring
Adjusting screw for pilot relief valve
with O-ring
Number per
unit
2 -
1 -
Tightening torque
6 | © Danfoss | November 2019 AX319758618681en-000101
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
Service Manual
VSPP Steering unit
VSPP version overview
Seal kit for VSPP
Required tools
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
VSPP holding tool
Holding tool dimensions drawing
©
Danfoss | November 2019 AX319758618681en-000101 | 7
•
Material: Appropriate metal or hard plastic.
•
This tool is not available from Danfoss.
0.5x45°
ø26±0.1
min ø40
min 35
100±5
P301 643
Service Manual
VSPP Steering unit
VSPP version overview
Assembly tool for dust seal
Assembly tool for dust seal
•
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.
8 | © Danfoss | November 2019 AX319758618681en-000101
Service Manual
VSPP Steering unit
VSPP version overview
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
©
Danfoss | November 2019 AX319758618681en-000101 | 9
Service Manual
VSPP Steering unit
VSPP disassembly
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
10 | © Danfoss | November 2019 AX319758618681en-000101
Service Manual
VSPP Steering unit
VSPP disassembly
Remove shock and relief valves from housing
To remove shock and relief valve parts from housing, follow these steps.
VSPP shock and relief valve parts
Wrench size and torque
Item Description Wrench size Torque
64 Adjusting screw for shock valve 5 mm Hex key 63 Valve seat for shock valve 2.75 mm Hex key 6 +0/-1 N•m [59 +0/- 8.9 lbf•in]
99 Adjusting screw for pilot relief
valve
90 Valve seat for pilot relief valve 6 mm Socket spanner 20 ± 3 N•m [177 ± 27 lbf•in]
6 mm Hex key -
1. Screw off the adjusting screws (2x64) using a 5mm Hex key.
O-rings (2x64.2) are fitted to the adjusting screws.
2. Remove the springs with a thrust pad (2x62) using a 2mm flat head screwdriver.
3. Remove the balls (2x61) using a magnet rod.
4. Screw out the valve seat (2x63) using a 2.75mm Hex key.
O-rings (2x63.2) are fitted to the valve seats.
5. Screw out the adjusting screw (99) using a 6mm Hex key.
O-ring (99.2) is fitted to the adjusting screw.
6. Remove the spring with cone (95) using a 2mm flat head screwdriver.
If the cone is not following the spring, remove the cone by using a magnet rod.
7. Remove the valve seat (90) using a 6mm socket spanner.
©
Danfoss | November 2019 AX319758618681en-000101 | 11
Loading...