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Summary of Contents for Eaton Vickers SA4-03 1 Series
- Page 1 ® Vickers Overhaul Manual Servo Valves Two-Stage Servo Valves SA4-03-**-***-1* SA4-06-**-***-1* Revised 9/1/87 I-3060-S...
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Page 2: Table Of Contents
Table of Contents Section Page Operating Characteristics ................Description . - Page 3 EEaton Hydraulics, Incorporated 2000 All Rights Reserved...
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Page 4: Operating Characteristics
Section I – Operating Characteristics Type ... . Electrohydraulic two-stage servo valve Operating Fluid ....Clean hydraulic fluid Filtration . -
Page 5: Principles Of Operation
Section IV – Principles of Operation A. System Control Independent control pressure can be supplied from a separate source such as a separate pump or from the In electrohydraulic servo valve systems, the control or com- supply pressure source using pressure reducing valves mand and feedback elements are electrical. -
Page 6: Installation
Section V – Installation Installation drawing 501500 shows correct valve dimensions, Manifolds (SVGM1-*-03-10, SVGM5-*-06-11 and port location, sub-plate mountings and other data. Vickers SVGM6-*-06-10) allow direct manifolding of the SA4 series engineering personnel should be consulted to determine valves to any MF-2003-A thru MF-2020-A size hydraulic correct valve use and other assistance. -
Page 7: Start-Up
E. Start-Up G. Linkage Ratio After electrical connection is made, the hydraulic system can Linkage ratio is the relationship of pilot spool movement to be started (with feedback devices disconnected). With main spool movement of the valve. This ratio is stamped into balanced current in the coils, the actuator controlled by the the nameplate of each unit. -
Page 8: Reassembly
B. Reassembly Reassembly is in reverse order of disassembly. Follow index numbers of Figure 6 in reverse order. Before reassembly of the servo valve, coat all parts with hydraulic fluid and replace all seals and gasket. Torque Model Number lbf. in. For proper reassembly, an alignment tool (Figure 5) must be SA4-03-**–**–10, 11, 12 35 –... -
Page 9: Troubleshooting
E. Troubleshooting TROUBLE PROBABLE CAUSE REMEDY No load movement Insufficient control pressure or supply Check the control pressure or supply pressure. pressure – the gage installation should be close to the servo valve. Improper or poor electrical connections. With the amplifier or signal source turned off, check continuity with an ohmmeter for cold solder joints on the electrical connectors, broken leads and for improper... - Page 10 TROUBLE PROBABLE CAUSE REMEDY Erratic load movement (cont’d.) Erratic input signal from amplifier or signal Check the amplifier or signal source for source. stability and check the input signal to the torque motor for freedom from hash and pick-up. Shield the input cables wherever required.
- Page 11 SA4-06-13 Design SA4-03-15 Design New Connector Arrangement 37 39 38 40 34 32 35 33 31 30 16 17 18 Figure 6. Servo Valve Assembly – Cross Sectional View Part Part Code Name Code Name 10933 Screw 4 4 4 4 4 4 4 4 4 225199 Plug 1 1 1 1 1 1 1 1 1...
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