Service Training PV Series 42 PV plus
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Transcript of Service Training PV Series 42 PV plus
Service Training PV Series 42Service Training PV Series 42
PVPVplusplus
Typical Service TasksTypical Service Tasks
Service of PVService of PVplusplus
• change shaft sealchange shaft seal• change shaftchange shaft• access to servo piston and servo sleeveaccess to servo piston and servo sleeve• add displacement feedbackadd displacement feedback• convert to horse power compensationconvert to horse power compensation• change of contour sleevechange of contour sleeve• pump disassembly pump disassembly • replace internal componentsreplace internal components
Section through the PVSection through the PVplusplus, frame size 2, PV046 , frame size 2, PV046
Change shaft seal, change shaftChange shaft seal, change shaftstep 1: remove keystep 1: remove key
Remove the key from keyed shaft, to avoid damage of the shaft seal
Change shaft seal, change shaft Change shaft seal, change shaft step 2: loosen the pilot coverstep 2: loosen the pilot cover
When loosening the pilot cover, the barrel hold down spring is unloaded.
Change shaft seal, change shaft Change shaft seal, change shaft step 3: remove pilot coverstep 3: remove pilot cover
Remove the pilot cover carefully
Change shaft sealChange shaft sealstep 4: exchange of shaft sealstep 4: exchange of shaft seal
For first assembly (new shaft) press in shaft seal, assemble washer and snap ring.for repair (used shaft) assemble washer first and then press in shaft seal.
First assembly (new shaft)
Repair (used shaft)
Change shaft sealChange shaft sealsituation new / used pumpsituation new / used pump
New shaft:shaft seal first, then washer. shaft seal is located further out
Used shaft:washer first, then shaft seal.sealing lip and dust protection lip are running on a new, un-damaged area further in the pump.
Change shaftChange shaftstep 4: remove shaftstep 4: remove shaft
To remove the shaft set the pump on the end cover (shaft vertical). That avoids, internal parts moving and damaging sealing surfaces .(See next slide)
Change shaftChange shaftstep 4: remove shaftstep 4: remove shaft
In this position all internal parts stay in their position. If the ingression of contamination is avoided, the pump can be used again without re-testing after assembling the replacement shaft.
Change shaftChange shaftstep 4: assemble new shaftstep 4: assemble new shaft
Keyed shaft can be replaced by splined shaft or vice versa.by changing shaft and mounting flange,the pump can be converted from metric mounting interface to SAE interface.
Change shaftChange shaftstep 4: assemble new shaftstep 4: assemble new shaft
Assemble shaft carefully by carefully turning insert the shaft into the barrel spline.Insert shaft carefully into the rear bearing.Front bearing must be below the mounting face before assembling the pilot cover.
Change shaftChange shaftstep 7: tighten boltsstep 7: tighten bolts
Mount pilot cover carefully. Avoid any damage of the shaft seal at the key slot or at the spline edges. First tighten two bolts only alternating.That compresses the barrel hold down spring.
Assemble of front bearing to the shaftAssemble of front bearing to the shaft
Access to servo piston and servo sleeveAccess to servo piston and servo sleevestep 1: remove displacement adjustmentstep 1: remove displacement adjustment
Open servo piston cover with two-hole wrench.
Self made two hole wrenchSelf made two hole wrench
Proposal for a selfmade two holewrench.two bolts M4, M5 or M6 can be used as „pins“.
Access to servo piston and servo sleeveAccess to servo piston and servo sleevestep 1: remove displacement adjustmentstep 1: remove displacement adjustment
The section view shows the location of the internal parts.
Access to servo piston and servo sleeveAccess to servo piston and servo sleevestep 2: remove servopistonstep 2: remove servopiston
Washer and tapered sleeve can be removed by lifting the pump to vertical.
Section through PVSection through PVplusplus, washer at servo piston at , washer at servo piston at full stroke, swash angle = 18°full stroke, swash angle = 18°
Tolerance compensation:
Not enough flow at full stroke: remove washer.
Section through PVSection through PVplusplus, washer at servo piston at , washer at servo piston at dead head, swash angle = 0°dead head, swash angle = 0°
Tolerance compensation:
Minimum flow at dead head: add washer.
Assembly PVAssembly PVplus plus displacement limiterdisplacement limiter
Contains:• servo piston plug• stroke limiter• seal-lock nut• o ring
Assembly tapered-/contour sleeveAssembly tapered-/contour sleeveand servo pistonand servo piston
Assembly of servo piston, washer and feedback sleeve into the vertical standing pump makes it easier to „find“ the thread of the swash plate connnector.See also next slide.
Assembly tapered-/contour sleeveAssembly tapered-/contour sleeveand servo piston (section view)and servo piston (section view)
Assembly of servo piston, washer and feedback sleeve into the vertical standing pump makes it easier to „find“ the thread of the swash plate connnector.
Access to servo piston and servo sleeve Access to servo piston and servo sleeve
Displacement feedback is done via the tapered feedback sleeve.
Tapered sleeve for pumps with Tapered sleeve for pumps with electrical displacement feedbackelectrical displacement feedback
Access to servo piston and servo sleeve Access to servo piston and servo sleeve
Displacement feedback is done with the contoured sleeve.
Contour sleeve for pumps with Contour sleeve for pumps with mechanical displ. Feedback (hp mechanical displ. Feedback (hp control)control)
Access to servo piston and servo sleeve Access to servo piston and servo sleeve disassembly with displacement feedbackdisassembly with displacement feedback
Putting the pump on one side avoids parts of the displacement feedback falling into the pump, when the servo piston and the feedback sleeve are removed.Alternatively the feedback device (LVDT or pilot cartridge) could be removed before removing the servo piston. Note: Do not change settings!
Remark:With the pump vertical (shaft upwards) the feedback components also stay in place and the re-assembly of servo piston and feedback sleeve is easier.
Change of a PV with standard compensator to a Change of a PV with standard compensator to a horse power compensated versionhorse power compensated version
plug M6 x 6pilot cartridgecontour sleeve
Disassembly of the pumpDisassembly of the pumpstep 1: Loosen bolts, remove three boltsstep 1: Loosen bolts, remove three bolts
If all 4 bolts are removed the internal parts of the pump can move uncontrolled and sealing surfaces could be damaged.
Disassembly of the pump, step 2: open, when pump Disassembly of the pump, step 2: open, when pump is verticallyis vertically
Remove fourth bolt and lift housing. That keeps all internal parts in position. Shaft could still be in the housing or removed first. Servo piston should be removed before disassembly.
PVPVplusplus end cover end cover
Remove or assemble rotating group carefully, to avoid any damage of the metal to metal sealing surfaces.
Air bleed valve
Gasket(steel, coated and bossed)
PVPVplusplus swash plate swash plate
The screw lock on the swash plate connector is good for 4 - 6 assemblies/disassemblies.The screw lock for the retainer screws is good for 2 assemblies/disassemblies.Nominal clearance of the slippers to the retainer is 0,03 - 0,09 mm.wear limit is: 0,15 mm.
PVPVplusplus cylinder barrel cylinder barrel
The spring is not dynamically loaded and needs not to be replaced for wear reasons.Caution when disassembling! Spring has high pre-load!
PVPVplusplus end cover, complete end cover, complete
PVPVplusplus servo piston sleeve servo piston sleeve
PVPVplus plus spring, carrier and washerspring, carrier and washer
PVPVplusplus air bleed valve air bleed valve
PVPVplusplus end cover end cover
Bearing is pressed in.port plate to be mounted with brass side up.plug M6 x 6 to be removed for horse power compensated pumps.
PVPVplusplus, prepared for through drive, prepared for through drive
PVPVplusplus, with thru drive, with thru drive