Related Manuals for Eaton Vickers PVE12
Summary of Contents for Eaton Vickers PVE12
- Page 1 ® Vickers Piston Pumps Overhaul Manual PVE Variable Pump 12–21 USgpm capacity at 1800 rpm Released 8/1/90 M-2854-S...
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Page 2: Table Of Contents
Table of Contents Section ..................I. -
Page 3: Introduction
Section I – Introduction A. Purpose Of Manual This manual describes operational characteristics and overhaul information for the PVE12, 19(*) and the PVE21(*)–** variable displacement piston pumps. The information contained herein pertains to the latest design series as listed in Table 1. - Page 4 Pump, Variable Displacement, Inline Piston, E–Series Flow Rating USgpm @ 1800 rpm 19 – 19 USgpm 21 – 21 USgpm Shaft Rotation (Viewed from shaft end) R – Right hand (clockwise) L – Left hand (counterclockwise) Input Shaft Type 1 – SAE B Straight keyed 2 –...
- Page 5 Shaft Seal Shaft Yoke Tapered Roller Bearing Drive Shaft Housing Rotating Group Figure 1. Sectional Views of the PVE Pumps Housing Yoke Valve Block Piston Bearing PVE12 Section View Wafer Plate PVE19 Section View Compensator Compensator...
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Page 6: Description
Section II – Description A. General Assembly of a typical pump package is shown in Figure 1. Six types of compensator subassemblies are used with the PVE series pumps. Refer to Section III for principles of operation. See Model Code for pressure settings. 1. -
Page 7: Principles Of Operation
Section III – Principles of Operation A. Piston Pump Rotation of the pump drive shaft causes the cylinder block, shoe plate and pistons to rotate. See Figure 2. The piston shoes are held against the yoke face by the shoe plate. The angle of the yoke face imparts a reciprocating motion to each piston within the cylinder block. -
Page 8: Compensator (Load Sensing Type - "Cv")
Compensator Spring Compensator Spool Outlet D. Compensator (Load Sensing Type - “CV”) Application A frequent application of pressure compensator pumps is to supply sevo valves or mechanically operated metering valves, whose function is to control flow to a hydraulic actuator (cylinder or motor). In such circuits it is often desirable that flow be proportional only to an external valve spool position. - Page 9 Compensator Spring Compensator Spool Outlet Relief Valve Circuit Operation At Minimum Pressure Refer to Figure 4 during the following description. Assume a no load condition. The pump load consists of the pressure drop across the valve spool orifice (nP), plus the pressure developed by the work being performed at the actuator.
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Page 10: Compensator (Load Sensing With Pressure Limiting - "Cvp", "Cvpc", "Cvpd")
External Valve Spool Orifice Size Increased If the external valve spool orifice size is increased, pump outlet pressure will decrease, lowering force against the compensator spool. (See Figure 4.) The compensator spring causes the spool to move, opening the yoke stroking piston to case drain. - Page 11 Compensator Spring Compensator Spool Load Sensing Spool Figure 5. Load Sensing Pressure Limiting Compensator (CVP, CVPC, CVPD) Set Screw External Valve Spool Orifice Yoke Stroking Piston Outlet Inlet Actuator Load Drain Yoke Spring Rotating Group...
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Page 12: Installation And Operating Instructions
Section IV – Installation and Operating Instructions A. Installation Drawings The installation drawing listed in Table 2 will show installation dimensions and port locations. B. Mounting and Drive Connections CAUTION Pump shafts are designed to be installed in couplings with a slip fit. Pounding can injure the bearings. Shaft tolerances are shown on the installation drawing. -
Page 13: Overload Protection
Sound Level Noise is only indirectly affected by the fluid selection, but the condition of the fluid is of paramount importance in obtaining optimum reduction of system sound levels. Some of the major factors affecting the fluid conditions that cause the loudest noises in a hydraulic system are: 1. -
Page 14: Service And Maintenance
Section V – Service and Maintenance A. Service Tools The following standard tools for overhauling the piston pump are shown in Figure 8. Standard Tools and Equipment: 1. Torque wrench with short extension and sockets 2. 1” micrometer 3. 1” depth micrometer 4. - Page 15 Figure 8. Standard Tools. 0.1875 “A” 0.120 Description Valve Block 1.675 Housing Use a 5” long 1/2” -13 hex head screw with this tool. Figure 10. Bearing Race Removal Tools. Figure 10a. Bearing Race Removal Tools. 1.232 .005 Use for Intermediate shaft bearing installation Drive shaft bearing installation Drive shaft bearing removal...
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Page 16: Replacement Parts
“C” “A” Figure 11. Special Bearing Race Installation Tools. 6.50 1.500 Heavy wall tubing 0.250 F. Replacement Parts Reliable operation throughout the specified operating range is assured only if genuine manufacturer’s parts are used. Sophisticated design processes and materials are used in the manufacture of these parts. -
Page 17: Troubleshooting
G. Troubleshooting Table 3 lists the common difficulties experienced with piston pumps and hydraulic systems. It also indicates probable causes and remedies for each of the troubles listed. TROUBLE PROBABLE CAUSE Excessive pump noise. Low oil level in the reservoir Air in the system Vacuum condition Oil too thick... -
Page 18: Overhaul
Section VI – Overhaul A. General CAUTION Before breaking a circuit connection, make certain that power is off and system pressure has been released. Lower all vertical cylinders, discharge accumulators, and block any load whose movement could generate pressure. After removing the pump from the system and before disassembly, cap or plug all ports and disconnected hydraulic lines. - Page 19 Refer to Service Drawings for assembly instructions and torque values. Item Description O-ring Retaining Ring Screw Plug O-ring Plug O-ring Seat Valve Spring Bearing Valve Block Valve Plate Gasket Item Description Housing Piston Rod Piston Piston & Shoe S/A Shoe Plate Shperical Washer Pin Retainer Retaining Ring...
- Page 20 Figure & Index Description Screw Gasket O-Ring Lockwire and Seal Adjusting Plug Back-Up Ring O-Ring Spring (pressure limiter) Seat Spool (pressure limiter) Body (compensator) Plug O-Ring Adjusting Screw Seat Spring (load sensing) Seat Spool (load sensing) Plug Orifice Plug Check Valve S/A Plug O-Ring Plug...
- Page 21 Figure 13. PVE19/21 Exploded View...
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Page 23: Assembly Of Compensator
3. Inspect spring (8) and (16) for wear and parallelism. Spring ends must be parallel. Replace if spring is warped or wear is evident. 4. Inspect seat (9) for wear in the area of spool contact. 5. Inspect spool (10) for excessive wear, galling, scratches, etc. -
Page 24: Inspection Repair And Replacement
Figure 14. Cylinder block subassembly disassembly tool. (Tighten nut, remove snap ring, loosen nut to relieve spring tension). F. Inspection Repair and Replacement 1. Check bearing (32) for scoring or brinelling of the rollers (PVE 19/21). 2. Check bearing spacer (33) for burrs (PVE 19/21). 3. - Page 25 Use shaft seal driver shown in Figure 12. The seal must be positioned just below the retaining ring groove. Install retaining ring (44, 47 for PVE12) into the housing. Use internal Truarc pliers to install retaining ring.
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Page 26: Assembly Of Housing Parts
Figure 16. Removal of Front Bearing Race. Arbor Press Here Retaining Ring Shaft Seal 1 1/2” heavy wall tubing 6” long. See Figure 11. Figure 17. Front Bearing Removal. Arbor Press Here Figure 18. Front Bearing Installation. G. Assembly of Housing Parts NOTE If a new shaft bearing (61), shaft (48), valve block (26), or housing (27) is required, a complete preload... - Page 27 a. Assemble pintle bearings (55) on each end of the yoke and insert bearing races (54). b. Install bearing spacer (53) at one pintle end. c. Install O-Ring (52) against spacer (53) into the groove, then install a 0.010 inch shim (51) under pintle cover (50).
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Page 28: Disassembly Of Valve Block
3. For PVE19/21, remove bearing race (63) from valve block (36). The PVE12 roller bearing is in the valve block. Refer to Figure 20 for removal information and use tool shown in Figure 10 for PVE**G units. Use tool shown in Figure 10a and procedure shown in Figure 20a for PVE** units with a blind hole in valve block (26). -
Page 29: Shaft Bearing Preload Adjustment
(26). Refer to Figure 13. 2. Assemble wafer plate (28) over the bearing race (pins on the PVE12) and locating pin (29) with wear surface away from valve block (26). Determine from the model code which wafer plate is used. See Figure 22. -
Page 30: Vii.test Procedure
If pressure starts to exceed 12 Psid while closing globe valve V2, the internal check valve is malfunctioning. DO NOT close globe valve V2 further; return to the open condition and repair the malfunction. 100 PSI System Pressure Model PVE12 PVE19 7.5-8.4 12.5-13.5 Delivery USgpm USgpm Max. -
Page 31: Performance Test Of Pve 12/19/21 Piston Pump With "Cg" Compensator Control
F. Performance Test of PVE 12/19/21 Piston Pump with “CG” Compensator Control 1. Operate pump at 1200 RPM. Set remote control valve to minimum pressure setting. Piston Pump Figure 23. Circuit Diagram for “C” and “CG” Control. Piston Pump Figure 24. Circuit Diagram for “CV”, “CVP”, and “CVPC”. 3. -
Page 32: Performance Test Of Pve 12/19/21 Piston Pump With "Cv", "Cvp", "Cvpc" And "Cvpd" Compensator Control
Psig as read at gauge P2. 6. The unit must meet the following requirements at 1200 RPM and full stroke. See Table 7. Record the flow readings. 100 Psig System Pressure Delivery Model Code USgpm PVE12*-*-**-CV-10 11.5 PVE12*-*-**CVP/CVP-11/CVPD 11.5 PVE19*-*-**-CV-10 12.5-13.5 PVE19*-*-**CVP/CVP-12/CVPD 12.45-13.45... - Page 33 Model PVE12*-*-**-C**VP11 PVE12*-*-**-C**VPC24 PVE12*-*-**-C**VPD41 PVE19*-*-**-CV-10 PVE21*-*-**-CV-10 PVE19*-*-**-CVP-12 PVE21*-*-**-CVP-12 PVE19*-*-**-CVPC-12 PVE21*-*-**-CVPC-12 Table 9. Load sensing compensator adjustment range. Eaton Hydraulics Compensator Pressure Lockwire Setting Psig 3000 3000 3000 Not Applicable Not Applicable 3000 2700 3000 2700 Standby P @ Compensator Pressure...