Overhaul Manual Piston Pumps PVH Piston Pumps

1 M 2210 SRev. 2/93 PVH Piston PumpsIncluding ControlsVickers Piston PumpsOverhaul ManualM 2210 SRev. 2/93 Section 1 IntroductionA. Purpose of ManualThis Manual describes basic operating characteristics andprovides Overhaul information for the vickers PVH 57/74/98/131 series Piston Pumps . The informationcontained herein pertains to the latest design series asshown in the model Related PublicationsInstallation dimensions for the PVH series Pumps andcontrols are not included in this Manual . Individual partsnumbers for the basic Pumps are also not included. Refer tothe related publication list below for publications that includethis type of drawing M 2206 SPVH74 Service drawing M 2207 SPVH98 Service drawing M 2208 SPVH131 Service drawingM 2209 SPVH Series Application GB C 2010C. Model Code DescriptionVariations within each basic model series are covered in themodel code as shown on the next page.

2 Service inquiresshould always include the complete unit model code numberas stamped on the name plate, and the assembly number asstamped on the mounting 2210 SRev. 2/93 Model CodeN = ISO 3014/2- Short straight E32 Nkeyed1 = SAE C Straight(J744-32-1)keyed2 = SAE C GSplined 14 tooth(J744-32-4)12/24 = SAE CC Splined 17 tooth (J744-38-4)12/24 = SAE D Splined 13 tooth (J744-44-4) 8/16 = SAE C Straight (J744-38-1) keyed16 = SAE D Straight (J744-44-1) keyedBlank = Non-thru-drive (single pump)A = Thru-drive pump with SAE A 2-bolt rear flange mounting (SAE J744-82-2)B = Thru- drive pump with SAE B 2- and 4-bolt rear flange mountings (SAE J744-101-2/4)C = Thru-drive pump with SAE C 2- and 4-bolt rear flange mountings (SAE J744-127-2/4)

3 S = Adjustable maximum volume stop (non-thru-drive and non-torque-control Pumps only)PVH ** QI * * (*) * ** * 10 C(M) ** (**) (**) *0 ** ** = Customer desired torque limiter setting specified in ten bar (145 psi) increments, : 8 = 80 bar (1160 psi); 18 = 180 bar (2610 psi). The torque setting range is from 30 80% of the specified compensator = 70-250 bar (1015-3625 psi) (standard)CM = 40-130 bar ((580-1885 psi) (optional QI version)IC = Industrial controlUV = Unloading valve control for accumulator circuitsShaft seal, prime mover endS = Single, one-way (standard)D = Double, two-way (optional) Recommended on second pump of tandem assembly (PVH**/ PVH**)Maximum geometric displacement46810 57 = cm3/r ( in3/r) 74 = cm3/r ( in3/r) 98 = cm3/r ( in3/r)131 = cm3/r ( in3/r)711 Mounting flange, prime mover endC = SAE C 4 bolt type (SAE J744-127-4 )M = ISO 3019/2 125B4HW (Option for PVH57QI and PVH/74QI only)R = Right hand, clockwise (Standard on QI models))

4 L = Left hand, counterclockwise (Optional on QI models)ConfigurationMain ports F = SAE 4-bolt flange pads (standard ) M = SAE 4-bolt pads with metric mounting bolt threads (PVH57 & PVH74 only) Shaft-end type, at prime mover end9 Pump design numberPressure compensatoradjustment rangeMobile pumpsIndustrial pumpsShaft rotation, viewed atprime mover end5234 5 6 7 8 91112 132 PVH ** - C * (*) * ** * 10 C ** (**) (**) *0 **1410 Additional control functions13 Blank = No additional controlsV = Load sensing, 20 bar differential pressure setting T = Torque limiterVT = Load sensing and torque limiterTorque limiter factory setting1415 Control design number31 = C, CM, or C**V = C**T controls14 = C**VT controls10 = UV and IC controls Built from pump with SAE A rear pad to which suitable flange adapter isbolted.

5 For best availability and flexibility,order PVH SAE A thru-drive pump andSAE B or C adapter kit (Subject to change. Installationdimensions unaltered for designnumbers 10 to 19 inclusive. )245678910131415151225 = Normal factory setting of 250 bar for C = Normal factory setting of 70 bar for CM compensator factorysetting in tens of bar16 Special features suffix027= Composite 2-bolt/4-bolt mounting conforming to SAE C (except PVH131)031= Thru-drive SAE A pad cover041= No case-to-inlet relief (for use with supercharged circuits)057= Shaft-up operation (vertical mount)Torque restrictions apply to #2 shaft inPVH74 and 98 thru-drive, and PVH131single and thru-drive, Pumps . vickers isnot responsible for misapplied usage ofthese shafts. Please contact a Vickersrepresentative for review of 111 Piston pump, variable displacement11312163 Industrial version16M 2210 SRev.

6 2/93 Section 2 DescriptionA. Basic PumpFigure 1 shows the basic construction of the PVH seriespiston pump. Major parts include the drive shaft, housing,yoke, rotating group, valve plate, control Piston , bias Piston ,valve block and compensator control. The PVH seriesreplaces the pintle bearing assembly with saddle bearings,which reduces weight and eliminates the roller bearings thatadded to maintenance time and Overhaul Pump ControlsTwo common pump control types are available. One type isthe standard C compensator control that limits pump outletpressure to a desired level. The other type is the CV pressure limiter/load sensing control. Now available is the IC (Industrial Control) which can be used as a load sensingcompensator, remote compensator control andelectrohydraulic control. These limit pump outlet pressureand also regulate pump displacement to match 3 Principles of OperationA.

7 Pump OperationRotation of the pump drive shaft causes the cylinder block,shoe plate and pistons to rotate (See Figure 2). The pistonshoes are held against the yoke face by the shoe plate. Theangle of the yoke face creates a reciprocating motion toeach Piston within the cylinder block. Inlet and outlet portsconnect to a kidney slotted wafer plate. As the pistons moveout of the cylinder block, a vacuum is created and fluid isforced into the void by atmospheric pressure. The fluidmoves with the cylinder block past the intake kidney motion of the Piston reverses and fluid is pushed out ofthe cylinder block into the outlet port. Warning Before breaking a circuit connection, make certainthat power is off and system pressure has beenreleased. Lower all vertical cylinders, dischargeaccumulators, and block any load whose movementcould generate pressure.

8 Plug all removed unitsand cap all lines to prevent the entry of dirt intothe valve platekidney slotValve blockFigure 1. PVH Section ViewPistonShoe plateFigure 2. PVH Pump OperationYoke faceOutlet portInlet portCylinder blockDrive shaftValve plateInlet valve plate kidney slotDrive shaftYokeControl pistonInletValve blockBias pistonPistonM 2210 SRev. 2/93 Principles of OperationB. Pump ControlsPressure Compensator Controls C & CM (Figure 3)The standard C and low pressure CM compensatorcontrols are internally pilot operated, spring offset, 2-wayvalves. Their purpose is to limit system pressure to a desiredlevel by varying pump displacement. These controls onlyprovide the flow required to satisfy the load demand, whilemaintaining a constant preset operation, load or system pressure is continually fedto the bias Piston .

9 The function of the bias Piston is tomaintain the yoke at a full pump displacement position. Loador system pressure is also fed to the compensator spoolchamber within the control. Pressure within the compensatorspool chamber acts upon the spring force of thecompensator load or system pressure is below the pressure settingof the compensator spring, the compensator spool remainsoffset and the pump continues to operate at fulldisplacement. When load or system pressure approachesthe compensator pressure setting, the compensator spoolwill start to move and overcome the compensator springforce. Fluid will then meter into the control Piston area. Sincethe control Piston area is greater than that of the bias Piston ,the control Piston pushes the yoke towards minimum pumpdisplacement. The compensator control continues to meterfluid to the control Piston , adjusting the pump displacement,and pumping only enough fluid to satisfy the load demandwhile holding the system at a constant load or system pressure exceeds the compensatorsetting, the compensator spool shifts towards the springchamber area.

10 A maximum amount of fluid is then meteredto the control Piston area, causing the yoke to shift tominimum pump system pressure decreases below the compensatorpressure setting, the compensator spool returns to itsoriginal position and the yoke returns to maintain maximumpump compensator is available in two pressure ranges. The C spring has an adjustment range of 70 250 bar(1015 3625 psi). The CM spring has an adjustment rangeof 40 130 bar (580 1885 psi).Figure 3. C & CM ControlsIDrPBodyPressure limiting adjustmentSpringTo tankPressure limiting spoolControl pistonYoke angleBias pistonPiston pumpLoad Sensing & Pressure Compensator Control C(M)*V(Figure 4)This pump will provide power matching of pump output tosystem load demand, maximizing efficiency and improvingload metering characteristics of any directional control valveinstalled between the pump and the sensing ensures that the pump always provides onlythe amount of flow needed by the load.