Table of Contents
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Table of Contents
Summary of Contents for Danfoss OSQA
- Page 1 Service Manual Flow amplifier OSQA/OSQB powersolutions.danfoss.com...
- Page 2 Service Manual OSQA/OSQB Revision history Table of revisions Date Changed July 2016 First edition 0101 HN25D293 | AX00000127en-US0101 © Danfoss | July 2016...
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Page 3: Table Of Contents
Symbols used in this literature..............................4 OSQ versions...................................... 5 Technical specifications Exploded view....................................6 Parts list........................................ 6 OSQA and OSQB parts list................................ 6 OSQ spare parts list..................................8 Tools........................................8 Disassembly Dismantling counter pressure valve............................9 Removing pressure relief valve ..............................11 Removing end cover at PP-connection.......................... -
Page 4: Safety Precautions
External hex head Mark orientation for reinstallation Internal hex head Torque specification Lubricate with hydraulic fluid Press in - press fit Inspect for wear or damage Pull out with tool - press fit HN25D293 | AX00000127en-US0101 © Danfoss | July 2016... -
Page 5: Osq Versions
Service Manual OSQA/OSQB Introduction OSQ versions This service literature is valid for: • OSQA: Flow-Amplifier without back pressure valve in HT • OSQB: Flow-Amplifier with back pressure valve in HT HN25D293 | AX00000127en-US0101 | 5 © Danfoss | July 2016... -
Page 6: Technical Specifications
Service Manual OSQA/OSQB Technical specifications Exploded view OSQA and OSQB exploded view 49.2 23.2 22.2 20.11 20.11 37.3 37.4 37.5 37.2 37.1 kwa1464729220764 Parts list OSQA and OSQB parts list Parts list Part Number per unit Item Tightening torque Housing —... - Page 7 Cover — Cover — Model/code label — Spring washer — Screw 25 ± 5/-0 N·m Spring washer — Screw 80 ± 10 N·m Plug with O-ring 25 ± 5 N·m HN25D293 | AX00000127en-US0101 | 7 © Danfoss | July 2016...
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Page 8: Osq Spare Parts List
Screwdrivers 3 and 10 mm • Steel mandrels 3, 5 and 8 mm • Torque wrench for 12 daNm [1060 lbf in] • Magnetic rod • Hook These tools are not available from Danfoss. HN25D293 | AX00000127en-US0101 © Danfoss | July 2016... -
Page 9: Disassembly
Place the unit on a work bench. Dismantling counter pressure valve Screw out the plug with O-ring (49) using an 8 mm Hex key. 2. Take out the small spring (47) using a hook. HN25D293 | AX00000127en-US0101 | 9 © Danfoss | July 2016... - Page 10 3. Take out ball (48) using a magnetic rod. 4. Take out the piston (46) using a hook. 5. Take out the spring (45) using a hook. Dismantled counter pressure valve HN25D293 | AX00000127en-US0101 10 | © Danfoss | July 2016...
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Page 11: Removing Pressure Relief Valve
Screw out the adjusting screw (23) using a 6 mm Hex key. O-ring (23.2) is fitted to the screw (23). 3. Remove the spring (22.2) with cone (22) using a hook or magnet rod. HN25D293 | AX00000127en-US0101 | 11 © Danfoss | July 2016... -
Page 12: Removing End Cover At Pp-Connection
(83) with spring washer (82) using a 10 mm Hex key. 2. Remove end cover (66). Spring stop (30) and springs (28, 29 and 13) will follow the end cover. HN25D293 | AX00000127en-US0101 12 | © Danfoss | July 2016... -
Page 13: Removing End Cover At Ls-Connection
(83) using a 10 mm Hex key. 2. Remove end cover (65). Spring stops (10 and 30) and springs (28 and 29) will follow the end cover. HN25D293 | AX00000127en-US0101 | 13 © Danfoss | July 2016... - Page 14 Service Manual OSQA/OSQB Disassembly 3. Remove spring stop (27) for directional spool (25). 4. Remove spring (5) for priority spool (2). 5. Remove directional spool (25). HN25D293 | AX00000127en-US0101 14 | © Danfoss | July 2016...
- Page 15 Service Manual OSQA/OSQB Disassembly 6. Remove amplifier spool (12). 7. Remove priority valve spool (2). 8. Remove shock valves (2x20) with screwdriver and hexagon key or mandrel. HN25D293 | AX00000127en-US0101 | 15 © Danfoss | July 2016...
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Page 16: Unscrew Orifices, Throttle Check Valve
Unscrew throttle check valve (6) (if present) in PP-connection using a 6 mm Hex key. Unscrew orifice (36) in housing using a 4 mm Hex key. Housing and end cover with accessories HN25D293 | AX00000127en-US0101 16 | © Danfoss | July 2016... -
Page 17: Spools With Accessories
OSQ dynamic with external PP: the priority valve spool has plug (3) and orifice, dynamic (11) • OSQ dynamic with internal PP: the priority valve spool has throttle/check valve (4) and orifice, dynamic (11) ‒ As shown in Dismantling priority valve spool on page 18 HN25D293 | AX00000127en-US0101 | 17 © Danfoss | July 2016... -
Page 18: Dismantling Priority Valve Spool
Hex key and multigrip pliers. Unscrew orifice, dynamic (11) using a 4 mm Hex key and multigrip pliers. Dismantled priority valve spool (25) with throttle/check valve (4) and orifice, dynamic (11) HN25D293 | AX00000127en-US0101 18 | © Danfoss | July 2016... -
Page 19: Dismantling Amplifier Spool
Carefully guide the locking ring (39) back. Be careful not to damage the locking ring. Carefully take the other locking ring (39) from the recess and guide it back using a 3 mm screwdriver. HN25D293 | AX00000127en-US0101 | 19 © Danfoss | July 2016... - Page 20 Service Manual OSQA/OSQB Disassembly a) Press out pin (38) using a 3 mm screwdriver or mandrel. b) Take out the plug (40). c) Take out the spring (15). HN25D293 | AX00000127en-US0101 20 | © Danfoss | July 2016...
- Page 21 Disassembly d) Take out the other pin (38) using a 3 mm screwdriver or mandrel. e) Take out the inner spool (14). Be careful not to damage the spool surface. HN25D293 | AX00000127en-US0101 | 21 © Danfoss | July 2016...
- Page 22 Unscrew check valve (37) using a 13 mm socket spanner and a mandrel in the pin hole. Unscrew orifice (41) from plug (40) using a 4 mm Hex key and a mandrel in the pin hole. HN25D293 | AX00000127en-US0101 22 | © Danfoss | July 2016...
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Page 23: Shock And Suction Valves
OSQ spare parts list on page 8. Replace shock and suction valves if polluted. Replacing O-rings is recommended. Shock and suction valve assembly (left) with O-ring dismantled (right) HN25D293 | AX00000127en-US0101 | 23 © Danfoss | July 2016... -
Page 24: Cleaning
Inspection and replacement • Replace all seals and washers. • Check all parts carefully and make any replacements as is necessary. Lubrication Before assembling, lubricate all parts with hydraulic oil. HN25D293 | AX00000127en-US0101 24 | © Danfoss | July 2016... -
Page 25: Assembly
5 ± 1 N·m [45 ± 10 lbf·in]. Place orifice (41) in plug (40) and tighten in the pin hole, using a 4 mm Hex key and a mandrel, 5 ± 1 N·m [45 ± 10 lbf·in]. HN25D293 | AX00000127en-US0101 | 25 © Danfoss | July 2016... -
Page 26: Assembling Amplifier Spool
Place inner spool in the correct position. When assembling OSQA 5 and OSQB 5 there are two ways of placing the inner spool, only one is correct. The pilot channel which faces upwards must be lined up with one of the 5 amplification holes in the outer spool. - Page 27 Place locking ring into the recess with end facing away from pin holes. 3. Place spring (15) on end of the inner spool (14). a) Place plug (40). b) Place pin (38) through outer spool (12) and plug (40). HN25D293 | AX00000127en-US0101 | 27 © Danfoss | July 2016...
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Page 28: Assembling Priority Valve Spool
The priority valve spool has throttle/check valve (4) and orifice, dynamic (11). Screw in orifice, dynamic (11) using a 4 mm Hex key and a multigrip pliers, 5 ± 1 N·m. HN25D293 | AX00000127en-US0101 28 | © Danfoss | July 2016... -
Page 29: Assembling Directional Spool
5 ± 1 N·m [45 ± 10 lbf·in]. Installing orifice and throttle check valve Screw orifice (36) in housing using a 4 mm Hex key, 5 ± 1 N·m [45 ± 10 lbf·in]. HN25D293 | AX00000127en-US0101 | 29 © Danfoss | July 2016... -
Page 30: Installing Shock Valves
7/16 – 20 UNF in PP-connection; Fit O-ring and plug; Tightening torque: 15 ± 3 N·m [133 ± 27 lbf·in]. Installing shock valves Guide shock valves, 2x (20) with O-rings (2x 20.11) in and then secure it by hand. HN25D293 | AX00000127en-US0101 30 | © Danfoss | July 2016... -
Page 31: Assembling Pressure Relief Valve
After entire assembly of the steering valve, make the pressure setting on a test panel according to valve setting specification, see Testing on page 40. a) Insert plastic protection plug (24). HN25D293 | AX00000127en-US0101 | 31 © Danfoss | July 2016... -
Page 32: Installing Osqb Back Pressure Valve
3. Place O-ring (49.2) on plug (49). a) Fit spring (47) in plug (49) with Vaseline. Screw in assembled plug and spring using an 8 mm Hex key, 25 ± 3 N·m [221 ± 27 lbf·in]. HN25D293 | AX00000127en-US0101 32 | © Danfoss | July 2016... -
Page 33: Installing Spools
Spring control must be placed in correct position against LS-connection. Guide priority valve spool (2) into place. 2. Place spring (5) on priority valve spool (2) The orifice must be placed in correct position against LS-connection. HN25D293 | AX00000127en-US0101 | 33 © Danfoss | July 2016... -
Page 34: Installing Pp End Cover
Guide amplifier spool (12) into place. 4. Guide directional spool (25) into place. Installing PP end cover 1. Place spring stop (27) on the directional spool (25). The spring must be fitted at the PP-connection. HN25D293 | AX00000127en-US0101 34 | © Danfoss | July 2016... - Page 35 3. Place O-rings, 2x (57), 2x (58) and 2x (59) and spring stop (30) in end cover (66). a) Place large spring (29) and small spring (28) in end cover (66). HN25D293 | AX00000127en-US0101 | 35 © Danfoss | July 2016...
- Page 36 O-rings less than 1 mm. Screw in screw (83) with washer (82) using a 10 mm Hex key until end cover is in place. HN25D293 | AX00000127en-US0101 36 | © Danfoss | July 2016...
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Page 37: Installing Ls End Cover
Installing LS end cover 1. Place spring stop (27) on the directional spool (25). 2. Place O-rings, 2x (57) and 2x (58) and spring stop (10) in end cover (65). HN25D293 | AX00000127en-US0101 | 37 © Danfoss | July 2016... - Page 38 O-rings less than 1 mm. Screw in screw (83) with washer (82) using a 10 mm Hex key until end cover is in place. HN25D293 | AX00000127en-US0101 38 | © Danfoss | July 2016...
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Page 39: Plastic Plugs
80 ± 10 N·m [708 ± 89 in·lbf] for the 10 mm Hex key. Plastic plugs Place or screw in the plastic plugs after testing or if storage is needed between assembly and testing. Plastic plugs placed or screwed into ports HN25D293 | AX00000127en-US0101 | 39 © Danfoss | July 2016... -
Page 40: Testing
If this is not possible, the adjusting screw of the pilot relief valve (see item 23, Exploded view page 6) must be turned clockwise until P-T, 70 bar is achievable. HN25D293 | AX00000127en-US0101 40 | © Danfoss | July 2016... -
Page 41: Pilot Relief Valve
Without pump supply the number of turns must match cylinder volume/displacement of OSPBX. Cylinder volume: 4000 ccm and OSPBX 200 LS greater than number of turns must be 4000/200 which is approximately or equal to 20 turns. HN25D293 | AX00000127en-US0101 | 41 © Danfoss | July 2016... - Page 42 Service Manual OSQA/OSQB HN25D293 | AX00000127en-US0101 42 | © Danfoss | July 2016...
- Page 43 Service Manual OSQA/OSQB HN25D293 | AX00000127en-US0101 | 43 © Danfoss | July 2016...
- Page 44 Phone: +86 21 3418 5200 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 changes being necessary in specifications already agreed.