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Summary of Contents for Danfoss VSPP
- Page 1 Service Manual Steering unit VSPP www.danfoss.com...
- Page 2 Service Manual VSPP Steering unit Revision history Table of revisions Date Changed November 2019 First edition 0101 © Danfoss | November 2019 AX319758618681en-000101...
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Page 3: Table Of Contents
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................................ -
Page 4: Safety Precautions
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. -
Page 5: Vspp Version Overview
Service Manual VSPP Steering unit VSPP version overview 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... - Page 6 Service Manual VSPP Steering unit VSPP version overview Item Description Tightening torque Number per unit Ring Bearing assembly Spool, priority valve with orifices 21.1 Spool 21.2 Orifice, PP 1 ± 0.1 N•m [8.9 ± 0.9 lbf•in] 21.3 Orifice, Dynamic 3.5 ± 0.5 N•m [31 ± 4.4 lbf•in]...
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Page 7: Seal Kit For Vspp
Required tools VSPP holding tool Holding tool dimensions drawing 120±2 90±1 1x45° 2xø15±0.1 ø46±0.5 150±2 P301 644 • Material: Appropriate metal or hard plastic. • This tool is not available from Danfoss. © Danfoss | November 2019 AX319758618681en-000101 | 7... -
Page 8: Assembly Tool For Dust Seal
ø40 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. -
Page 9: Additional Tools Needed
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 •... -
Page 10: Vspp Disassembly
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... -
Page 11: Remove Shock And Relief Valves From Housing
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... -
Page 12: Remove Priority Valve Parts And P-Check From Housing
To remove priority valve parts and P-check valve parts from housing, follow these steps. Replace the VSPP unit in the holding tool, so that it’s placed with the column surface on the fixture. VSPP placed on column surface in the fixing tool 12 | ©... -
Page 13: Priority Valve Parts And P-Check Details
Service Manual VSPP Steering unit VSPP disassembly Priority valve parts and P-check details VSPP priority valve and P-check parts Wrench size and torque Item Description Wrench size Torque Plug with O-ring 22 mm Socket spanner 40 ± 10 N•m [354 ± 88 lbf•in] 21.2... - Page 14 Service Manual VSPP Steering unit VSPP disassembly 6. Screw off the screw (87) using a 6mm Hex key. O-ring (87.2) is fitted to the screw. 7. Remove the spring (86). 8. Remove the valve cone (85) Do not remove plug (75). This is a pure blinding plug.
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Page 15: Remove End Cover, Gear Set, Cardan Shaft, Distributor Plate, O-Rings And Valves From Gear Set End Of Housing
Service Manual VSPP Steering unit VSPP disassembly Remove end cover, gear set, cardan shaft, distributor plate, O-rings and valves from gear set end of housing To remove end cover, gear set, cardan shaft, distributor plate, suction-, LS-check- and emergency steer valves from housing, follow these steps. - Page 16 Service Manual VSPP Steering unit VSPP disassembly 12. Lift off the VSPP housing from holding tool and let balls (5), (2x81), and (173) fall out. Hold in hand to remove balls from gear set end 16 | © Danfoss | November 2019...
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Page 17: Remove Spool/Sleeve Set From Housing
VSPP disassembly Remove spool/sleeve set from housing 1. Place the VSPP housing on the work pbench on the port face. VSPP placed on port face on work bench 2. Determine if cross pin (12) in spool/sleeve set (1) is parallel to port face. If not, insert cardan shaft (13), and rotate spool/sleeve set (1) to position cross pin (12) correctly. -
Page 18: Disassemble Spool/Sleeve Set And Remove Dust Seal And Shaft From Housing
4. Press the set of neutral springs (14) out of the slot of the spool. 5. Remove the dust seal (9), and the shaft seal (7), carefully with a 2mm screw driver. The VSPP steering unit is now completely dismantled. Disassembled VSPP Steering unit 18 | ©... -
Page 19: Vspp Maintenance
Service Manual VSPP Steering unit VSPP maintenance Cleaning Clean all parts carefully in Shellsol K or similar cleaning fluid. Inspection and replacement Replace all seals and washers. Place new O-rings from seal kit on plugs (24.1, 25.1, 64.1, 87.1, 99.1) and on seats (63.1). -
Page 20: Vspp Assembly
Most spool and sleeve sets for VSPP have no marks, so those can be positioned relative to each other, in either of the 2 positions possible. - Page 21 Service Manual VSPP Steering unit VSPP assembly Marking on spool and sleeve 2. Guide the spool into the sleeve (1). Make sure the neutral springs (14) are placed into the slot. 3. Line up the spring set (14). Aligning the spring set 4.
- Page 22 Service Manual VSPP Steering unit VSPP assembly 6. Fit bearing races and needle bearing (17) as shown on the drawing below. Standard bearing assembly pattern Assembly pattern for standard bearing: 1. Outer bearing race 2. Needle bearing 3. Inner bearing race 4.
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Page 23: Assemble Shaft Seal And Spool/Sleeve Set To Housing
(2) for the spool/sleeve set (1). VSPP with guide for shaft seal. 2. Grease the new shaft seal (Roto Glyd. 7) with hydraulic oil and place them on the tool. - Page 24 6. Guide the spool and sleeve into the bore with a light turning movement. Fit the spool set holding the cross pin (11) horizontally. VSPP with spool set 24 | © Danfoss | November 2019...
- Page 25 Service Manual VSPP Steering unit VSPP assembly 7. Install the shaft seal. The spool set will push out the assembly tool guide. © Danfoss | November 2019 AX319758618681en-000101 | 25...
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Page 26: Assemble Valve Parts, O-Rings, Distributor Plate, Cardan Shaft, Gear Set, And End Cover To Gear Set End Of Housing
Assemble valve parts, O-rings, distributor plate, cardan shaft, gear set, and end cover to gear set end of housing To assemble below parts to gear set end of housing, follow these steps. Ensure that the VSPP unit is placed in the holding tool, with the column surface on the fixture. VSPP correctly placed in holding tool for assembly... - Page 27 Place the gear wheel side with all the deeper splines facing downdwards. Only this side will fit on the cardan shaft due to all gear sets used in VSPP hasve timing securing: splines of gear wheel and cardan shaft can only be assembled with correct timing.
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Page 28: Assemble Priority Valve Parts And P-Check To Housing
Service Manual VSPP Steering unit VSPP assembly Assemble priority valve parts and P-check to housing VSPP priority valve and P-check parts Wrench size and torque Item Description Wrench size Torque Plug with O-ring 22 mm Socket spanner 40 ± 10 N•m [354 ± 88 lbf•in] 21.2... -
Page 29: Assemble Shock And Relief Valves, And Dust Seal, To Housing
To assemble shock and relief valve parts to the column end of the housing, follow these steps. Place the unit on the holding tool on the gear set end. VSPP placed on mounting tool - gear set end © Danfoss | November 2019... -
Page 30: Assembly Details For Shock And Relief Valves, And Dust Seal
Service Manual VSPP Steering unit VSPP assembly Assembly details for shock and relief valves, and dust seal VSPP shock and relief valve parts Wrench size and torque Item Description Wrench size Torque Adjusting screw for shock valve 5 mm Hex key Valve seat for shock 2.75 mm Hex key... - Page 31 Service Manual VSPP Steering unit VSPP assembly 10. Screw in plastic plugs to the connections ports to keep the ports clean during storage and transportation. VSPP with plastic plugs in ports © Danfoss | November 2019 AX319758618681en-000101 | 31...
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Page 32: Testing Of Vspp
Service Manual VSPP Steering unit Testing of VSPP This section describes minimum tests needed, when the VSPP steering valve has been disassembled and reassembled. Example of system setup: VSPP steering unit with supply from gear pump. VSPP in system Set-up for testing Use universal hydraulic work bench with pump capacity: •... -
Page 33: Shock Valves
Exploded view, VSPP on page 5) is set according to specification: Maximum steering pressure (P-T), bar, for the code in question. The setting pressure is the pressure on the P-port minus the T-port of VSPP. © Danfoss | November 2019... -
Page 34: Neutral Positioning Test
Service Manual VSPP Steering unit Testing of VSPP Neutral positioning test 1. After adjusting the pilot relief valve, the steering wheel must be able to go to neutral position by itself no later than ~1 second after the activation of the steering wheel has been stopped. -
Page 35: Tightening Torques For Connections
Service Manual VSPP Steering unit Tightening torques for connections Tightening torques for connections Tightening torques for connections on VSPP Connections Recommended tightening torque N•m [lbf•in] With cutting edge With copper washer With alum. washer O-ring G 1⁄2 100 [885] 55 [486] 80 [708] 3⁄4-16 UNF... - Page 36 Phone: +86 21 2080 6201 Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequent changes being necessary in specifications already agreed.