Bosch VPV 16 Installation and operating manual

Hydraulics
VPV Vane Pump
Whisper™ Pump
Service and Repair Guide
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Welcome to the Service Guide for the VPV Pump !
Dear Customer:
First of all we would like to thank you for choosing the Bosch VPV Pump.
This brochure was designed as a guide covering all aspects of the repair procedures and to help
accomplishmaximumperformanceandalonglifefortheBoschVPV16cc–164cc(1in3–10in3),
210 bar (3000 PSI) pump.
On the following pages there is an illustrated step by step guide for all repair procedures.
If there are any additional questions our technical support team will be glad to help. Please call:
Phone: [phone]or
Fax: [phone]
If you have Internet access we would like to invite you to visit our Website:
http://www.boschat.com
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Service and Repair Guide 1
H
Section 1: Pump
1.1 DisassemblyProcedures–VPV16–164
1.1.1 Introduction Page 2
1.1.2 Getting-Started – Preparing the Tools Page 2
1.1.3 Instructions Page 3
1.2 AssemblyProcedures–VPV16–164
1.2.1 Introduction Page 9
1.2.2 Getting Started – Repair Kit, Seal Kit and Shaft Seals Page 9
1.2.3 Instructions Page 11
Section 2: Compensator
2.1 Disassembly Procedures – Two-Stage Compensator Page 19
2.2 Assembly Procedures – Two-Stage Compensator
2.2.1 Getting started Page 22
2.2.2 Instructions Page 23
2.3 Disassembly Procedures – Single Stage Compensator Page 27
2.4 Assembly Procedures – Single Stage Compensator
2.4.1 Getting Started Page 29
2.4.2 Instructions Page 30
Section 3: Compensator Adjustment Procedures
3.1 Proper Setting of the Thrust Screw Page 32
3.2 Adjustment Procedures – Single Stage Compensator Page 34
3.3 Adjustment Procedures – Two-Stage Compensator Page 36
3.4 Multi-Pressure Compensators
3.4.1 Solenoid Two-Pressure Control Page 38
3.4.2 Solenoid Vented Page 40
3.5 Load Sense Page 42
3.6 TorqueLimiter Page 45
3.7 MaximumFlowLimiter Page 49
Section 4: System Preparation Procedures
4.1 Fluids, Filters & System Preparation Page 50
4.2 Pump Installation Procedures Page 52
4.3 System Start-Up Procedures Page 53
4.4 Trouble Shooting Page 54
Section 5: Additional Information
5.1 DimensionsofDoublePumps Page 57
5.2 Bearing Puller for VPV Pump – Instructions for Use Page 58
Table of Contents VPV 16–164, 3000 PSI
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1.1 Disassembly Procedures –VPV 16–164
2 Service and Repair Guide
H
1.1.1 Introduction
The disassembly shown on the following pages covers the Bosch VPV 16cc –164cc variable volume vane
pumps.The complete disassemblyprocedures are similarfor all pumps.Any differences betweenthe
pump models are described in additional notes.
1.1.2 Getting Started – Preparing the Tools
erutxiFnedooWfoyrtemoeGdednemmoceR:2elbaT VPV 61 23/52 08/36/54 461/031/001
)mm(hcni–retemaiD3
3
/ 8 )68(4
1
/ 8 )501(5
1
/ 8 )131(6
1
/ 8 )651(
)mm(hcni–thgieHmuminiM2)15(2
5
/ 8 )76(3)67(3
7
/ 8 )89(
ylbmessasiDpmuProfslooT:1elbaT VPV 61 23/52 08/36/54 461/031/001
revoC hcnerWnellA swercSpaCdaeHtekcoS4 mm8mm01mm41mm71
lavomeR–setalPdnarevoC srevirdwercSedalBtalF2
lavomeR–senaV sreilPesoNeldeeNgnoLforiaParosrezeewT
senaV11senaV11senaV11senaV22
revoCsaiB+rotasnepmoC hcnerWnellA swercSdaeHtekcoS4×2mm6mm6mm8mm8
wercStsurhT hcnerWnellAmm8–23/52/61VPV 7820325359:tekcoSrennapSpils-noN–08/36/54VPV 6820325359:tekcoSrennapSpils-noN–461/031/001VPV
tuNkcoLwercStsurhT —hcnerWrennapSecaFelbatsujdA 1etoN
lavomeR–gniraeB —relluPgniraeBhcsoB 2etoN
lavomeR–laeStfahS hcnuPdaeHdnuoRdnaremmaH
Note 2 (Fig. 1.1.2-c):
It is recommended that the four different sizes of bearing puller tools be
purchased as a complete kit to guarantee that the proper tool is on hand
for any size VPV (Part-No. 9 511 230 691). Please see Section 5.2:
BearingPulleronPage58. Fig. 1.1.2-c
Note 1 (Fig. 1.1.2-b):
For older VPV 16–32 models, a crowfoot may be needed for the
disassembling of the thrust screw locknut. This crowfoot is included in
the Bosch VPV tool kit (Part-No. 9 511 230 557).
Fig. 1.1.2-b
Wooden Fixture (Fig. 1.1.2-a):
As an aid for repairing the VPV pump, we recommend building a
woodenfixture.Please see the differentinsidediameters for each pump
inTable 2.
Fig. 1.1.2-a
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1.1 Disassembly Procedures –VPV 16–164
Service and Repair Guide 3
H
1.1.3 Instructions
1. Remove the straight key from the keyway of the shaft and
place the pump shaft side down into the wooden fixture
(Fig. 1.1.3-1). See Page 2 for details and illustration of
woodenfixture.
Fig. 1.1.3-1
Note 3:
For disassembling the larger pumps, a great amount of
torque will be needed to loosen the cover bolts. Therefore,
we recommend loosening the bolts before removing the
pump from the motor-unit. Use a socket or extend the length
of your Allen wrench and make sure to clamp the pump
safely (Fig. 1.1.3-2b).
3. Insert flat blade screwdriver into the slots provided on
each side of the cover. Pry the cover assembly loose using
equal force on each screwdriver (Fig. 1.1.3-3). After the
cover is loose, carefully remove it by hand and set it aside
in a clean area.
Fig. 1.1.3-3
2. Remove the four socket head cap screws on the cover by
usingtheappropriatesizeAllenwrench(Fig. 1.1.3-2a).
Fig. 1.1.3-2a
Fig. 1.1.3-2b
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1.1 Disassembly Procedures –VPV 16–164
4 Service and Repair Guide
H
4. In order to remove the port plate from the cover, insert flat
blade screwdriver into the slots between the port plate and
cover and pry the port plate loose (Fig. 1.1.3-4a). After the
port plate is loose, carefully remove it by hand.
Note 4:
When disassemblingaVPV45–164,pleasepayattention
not to loosen the ratio valve cartridge that is located in the
cover (see Fig. 1.1.3-4b and c) and the ratio valve sealing
assembly that is located on the back of the cover port plate.
The ratio valve cartridge is an essential part of the pump and
is not a wear item, so it is not part of the repair kit. Fig. 1.1.3-4a
6. Remove the vanes from the rotor by using a small pair of
tweezers or long needle nose pliers (Fig. 1.1.3-6). Caution
should be exercised not to nick or score the vanes,
pressure ring and rotor.
Fig. 1.1.3-6
5. Remove the cover O-ring (Fig. 1.1.3-5).
Fig. 1.1.3-5
Fig. 1.1.3-4c
Radio Valve Cartridge
BB
SECTION B-B
Scale: 2X
Fig. 1.1.3-4b
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1.1 Disassembly Procedures –VPV 16–164
Service and Repair Guide 5
H
8. Remove the four socket head screws on the compensator
by using the appropriate Allen wrench (Fig. 1.1.3-8) and
removethe compensator.
Fig. 1.1.3-8
7. Remove the rotor shaft (Fig. 1.1.3-7).
Fig. 1.1.3-7
9. Carefully remove the control piston and spring (Fig. 1.1.3-9a and b) being careful not to nick or
scratch the piston or the piston bore.
Fig. 1.1.3-9a Fig. 1.1.3-9b
10. Remove the four socket head cap screws on the bias cover
by using the appropriate Allen wrench (Fig. 1.1.3-10) and
remove the bias cover. The bias cover is over the bias
piston or the smaller piston opposite the control piston.
Carefully remove the bias piston ensuring that the bias
piston and the piston bore are not scratched or nicked.
Fig. 1.1.3-10
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1.1 Disassembly Procedures –VPV 16–164
6 Service and Repair Guide
H
11. For VPV 45–164 pumps, loosen the thrust screw lock ring
by using a spanner wrench (Fig. 1.1.3-11). For VPV 16–32
pumps, loosen the locknut with an adjustable wrench (not
pictured). Please see Note 1 on Page 2 when
disassemblingthe VPV 16–32.
Fig. 1.1.3-11
12. Remove the thrust screw (Fig. 1.1.3-12a) by using the
appropriate spanner socket or Allen wrench, from the
Bosch VPV repair tool kit.
Fig. 1.1.3-12a
Note 5:
In addition to the thrust screw, the VPV 45–164 has a
thrust block (Fig. 1.1.3-12b). Remove the thrust block from
the body.
Fig. 1.1.3-12b: Thrust Block for VPV 45–164
13. Remove the pressure ring (Fig. 1.1.3-13).
Fig. 1.1.3-13
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1.1 Disassembly Procedures –VPV 16–164
Service and Repair Guide 7
H
17. To drive out the shaft seal take a round head punch and
carefullytapit outfromthecover side of pump (Fig.1.1.3.-17).
Remove the shaft seal.
Fig. 1.1.3-17
16. If the bearings are damaged and need to be replaced,
remove the bearings in the body and the cover by using the
Bosch VPV bearing puller (Fig. 1.1.3-16). Please see
Section 5.2 –Bearing Puller for more details.
Fig. 1.1.3-16
15. Remove the port plate from the body by carefully grabbing
the port plate at the thru-hole location (Fig. 1.1.3-15). After
the plate has been lifted out, set it aside. Be careful not to
scratch or nick the coating on the port plates. Leave the
seals in the port plate.
Fig. 1.1.3-15
14. Remove the spacer ring (Fig. 1.1.3-14).
Fig. 1.1.3-14
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1.1 Disassembly Procedures –VPV 16–164
8 Service and Repair Guide
H
After the pump has been completely disassembled, all parts must be thoroughly cleaned with clean
solvent. At this time inspect and determine which parts need to be replaced. In a major overhaul, itis
recommended that both bearings and all seals be replaced regardless of their condition. Kits containing all
seals are available for use in the repair of this pump.
When ordering repair parts it is necessary to provide either the alpha-code or the 10-digit part-number
which will be0 513 xxx xxx,describing the pump. Thisinformation can be foundon the nameplate attached to
the rear cover of the pump body. We always prefer the 10-digit part number, but the long hydraulic code is
alsosufficient.
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1.2 Assembly Procedures –VPV 16–164
Service and Repair Guide 9
H
As it is shown in Table 4 the Seal Kit is included as part of the Repair Kit. However, if only a Seal Kit is
needed please refer to Table 5 on the next page.
tiKlaeSVPV+tiKriapeRVPVstnetnoC:4elbaT tiKriapeRVPVtiKlaeSVPV
feR noitpircseD YTQ feR noitpircseD YTQ
1sniPlloR431laeStfahS1
2yeK141revoCgnir-O1
3tiKenaV151setalPtroPgniRpu-kcaB2
4ylbmessAwercStsurhT )ylno23–61VPV( 161)*ees(rotasnepmoCtiKgnir-O1
5ylbmessAkcolBtsurhT )ylno461–54VPV( 171telnIyradnoceSgnir-O )ylno461–54VPV( 1
6gniRrecapS181)**ees(setalPtroPsgnir-O1
7tfahSrotoR191laeStooRsgnir-O2
8gniRerusserP102revoCsaiBgnir-O1
9etalPtroPydoB112ylbmessAgnilaeSevlaVoitaR )ylno461–54VPV( 1
01etalPtroPrevoC1
11gniraeB2
21tiKlaeS1
* see Page 29 for Single Stage Compensator
see Page 22 for Two-Stage Compensator
** seePage 13
The reference numbers for the parts in Table 4 are shown in Fig. 1.2.2 on the next page. The VPV
seal kit part numbers are listed in Table 5.
1.2.1 Introduction
To guarantee proper operation of the VPV pump, Bosch recommends replacing all important pump parts
by using the Bosch repair kit and the Bosch VPV Seal kit.
1.2.2 Getting Started –Repair Kit, Seal Kit and Shaft Seals
Table 3 shows which Repair Kit corresponds to which VPV pump.
)ISP0003(tiKriapeRVPV:3elbaT VPV EAS CIRTEM ”1P“EAS ”1P“CIRTEM
616060321159706032115980603211599060321159
528950321159995032115932603211592260321159
238950321159995032115932603211592260321159
549360321159446032115924603211596460321159
369360321159446032115924603211596460321159
081460321159546032115934603211597460321159
0010560321159456032115925603211596560321159
0310560321159456032115925603211596560321159
4611560321159556032115935603211597560321159
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1.2 Assembly Procedures –VPV 16–164
10 Service and Repair Guide
H
Figure 1.2.2 Pump Components with numbered Repair and Seal Kit Parts
setaReuqroTweivrevO:8elbaT VPV 61 23/52 08/36/54 461/031/001
)mN(sbl-ni—revoC007)28(0021)041(0081)012(0794)085(
)mN(sbl-ni—revoCsaiB053)14(053)14(086)08(086)08(
rotasnepmoC)mN(sbl-ni—053)14(053)14(086)08(086)08(
tuNwercStsurhT)mN(sbl-ni—069)211(069)211(woleBeeS* .elbissopsathgitsahcnerwrennapsahtiwgnirgnikcolwercstsurhtehtnethgit,spmup461–54VPVnO*
For applications using water-glycol, please use the shaft seals listed in Table 6:
For all other applications, please use the shaft seals listed in Table 7:
tiKlaeSVPV:5elbaT-retawrofslaestfahS:6elbaT snoitacilppalocylg larenegrofslaestfahS:7elbaT snoitacilppa
VPV CIRTEM+EAS VPV laeStfahS VPV laeStfahS
615060321159612320325359614510325359
23/52795032115923/52132032535923/529600325359
08/36/54856032115908/36/54032032535908/36/543810325359
461/031/0019560321159461/031/0018520325359461/031/0016420325359
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1.2 Assembly Procedures –VPV 16–164
Service and Repair Guide 11
H
Preparing the tools
1.2.3 Instructions
1. Replace the shaft seal prepare the exploded view Fig. 1.2.2 .
Before installing the shaft seal, clean the seal bore (Fig. 1.2.3-1a) and seal O.D. with Loctite 7070
cleaner and place some hydraulic sealant (Loctite 569) on the O.D. surface of the shaft seal as it is
shown in Fig. 1.2.3-1b. Finally, press the shaft seal into the pump body to the depths recommended
in Table 10, with the installation depth being measured from the pump housing surface. Insure that the
shaft seal is installed properly in the pump body or leakage will occur.
spmuPVPVfoylbmessAehtrofslooT:9elbaT VPV 61 23/52 08/36/54 461/031/001
hcnerWnellA-revoCmm8mm01mm41mm71
setalPtroPotnisniPnoitallatsnIremmaH
revoCsaiB&rotasnepmoC hcnerWnellA mm6mm6mm8mm8
wercStsurhT hcnerWnellAmm8dna)7550321159tiKlooT(tekcoSrennapS
gniRkcoLwercStsurhThcnerWrennapSecaFelbatsujdA 2egaP,1etoN
laeStfahSdnagniraeB noitallatsnI tnalaeSciluardyH965etitcoL&renaelC0707etitcoL,sserP
noitacirbuL liOciluardyHnaelC
shtpeDlaeStfahS:01elbaT
VPV htpeD )mm( ecnareloT )mm(
610.25.0±
23/523.45.0±
08/36/540.015.0±
461/031/0010.015.0±
Fig. 1.2.3-1a Fig. 1.2.3-1b
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1.2 Assembly Procedures –VPV 16–164
12 Service and Repair Guide
H
2. Replace the bearings for the body and cover . The body and cover bearings are identical.
Place the bearings into the bearing bores and thoroughly lubricate the bearing I.D.’s with clean
hydraulicfluid.
Fig. 1.2.3-2a: Orientation of the bearing
115
90
25º25º
-115
-90
00
Cover Bearing Body Bearing
Orientation of bearing
lube slot
Orientation of bearing
seam assembly slot
Fig. 1.2.3-2b: Body Bearing
Please pay attention to the correct orientation of the bearing prior to installing the bearings in
the pump body and cover as it is shown in Fig. 1.2.3-2a, b and c.
3. Replace the port plates and and make sure to
drive the two roll pins into the holes on the back of each
port plate (Fig. 1.2.3-3). Let the pins protrude .3".
Fig. 1.2.3-3
It is recommended that a guide tool be used to properly
install the bearings in the bores. After the bearing is
installed, make sure the bearing is flush to 0.020" (0.5 mm)
below the machined surface. Using a new rotor shaft, check
the fit of the shaft to the installed bearings and assure that
the shaft enters the bearing without drag. Replace the
bearing if any drag is noticed.
Fig. 1.2.3-2c: Body Bearing
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1.2 Assembly Procedures –VPV 16–164
Service and Repair Guide 13
H
4. Replace the seals and back-up rings on the backside of
both port plates (Port plate with seals see Fig.1.2.3-4a)
Install seals on each port plate.
Fig. 1.2.3-4a
If necessary, use a light grease or petroleum jelly to help retain
the seals during placement of the port plates into the body (Fig.
1.2.3-4b). Avoid applying too much grease on the seals during
assembly since this condition can cause the O-rings to
dislodge when the port plates are installed in the pump.
Fig. 1.2.3-4b
)2.2.1.giFees(etalPtroPrevoC
FER noitpircseD YTQ
VPV 23/52/61 VPV 461/031/001/08/36/54
51 kcartecaregralni)etihw(laespu-kcaB 11
51 erobretnuocllamsni)etihw(laespu-kcaB 01
81 kcartecaregralnignir-O 11
81 kcartecarllamsnignir-O 11
91 erobretnuocnignir-O 11
12 erobretnuocllamsnignir-O 01
)2.2.1.giFees(etalPtroPydoB
FER noitpircseD YTQ
VPV 23/52/61 VPV 461/031/001/08/36/54
51 kcartecaregralni)etihw(laespu-kcaB 11
81 kcartecaregralnignir-O 11
81 kcartecarllamsnignir-O 11
91 erobetnuocnignir-O 11
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1.2 Assembly Procedures –VPV 16–164
14 Service and Repair Guide
H
5. Place the port plate into the pump body (Fig. 1.2.3-5a).
Note that the pins fit in the provided holes. Completely
lubricatetheportplate’swearsurfacewith cleanhydraulicfluid.
Fig. 1.2.3-5a
Note 6:
Be certain to ensure that the correct port plates are
installed in the body and the cover. If unsure, compare the
arrows on the port plates with the arrow on the pump. The
arrow on the pump can be found below the open segment
for the control piston on the pump body. Both arrows must
point in the same direction (Fig. 1.2.3-5b). All VPV pumps
operate in a clockwise only direction of rotation as viewed
from the shaft end of the pump.
Fig. 1.2.3-5b
Note 7:
On the VPV 45–164, the open segment on the spacer ring
aligns with the thrust block bore. On the VPV 16–32 there
is no break in the spacer ring. Align the break with the thrust
screw. The remaining set of holes will align with the bias and
control pistons.
6. Install the spacer ring in the pump body (Fig 1.2.3-6).
Fig. 1.2.3-6
7. Assemble the bias piston into thebodythroughtheclearance
hole in the spacer ring (Fig. 1.2.3-7). Lubricate the piston
withcleanhydraulic fluid.
Fig. 1.2.3-7
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1.2 Assembly Procedures –VPV 16–164
Service and Repair Guide 15
H
Note 8b: VPV 45-164
Install the thrust screw with O-ring by using a spanner
wrench and socket (see Fig 1.2.3-10a). Install the thrust
block with plastic pad (Fig1.2.3-10b) in the body. The
contoured end has to align with the pressure ring.
For preliminary adjustment of the thrust screw, tighten it all
the way and then turn it out a 3/4" turn CCW. Take care not
to over-tighten the thrust screw or damage to the pump can
occur. For the final thrust screw adjustment, see Page 32. Fig. 1.2.3-10b: Thrust Block for VPV 45–164
9. Thoroughlylubricatethepressureringwithcleanhydraulic
fluid. Place the pressure ring in the pump body
(Fig. 1.2.3-9).
Fig. 1.2.3-9
10. For VPV 45–164 pumps, prior to installing the thrust screw
assembly, lightly coat the bearing surface on the thrust block
assembly withclean hydraulicfluid.
Fig. 1.2.3-10a: VPV 45–164
8. Assemblethecontrolpistonandspringthroughtheclearanceholeinthespacerring (Fig.1.2.3-8aandb).
Lubricatethepistonbeforeinstalling.
Fig. 1.2.3-8a Fig. 1.2.3-8b
Note 8a: VPV 16-32
Install the thrust screw in the body by using an Allen head
wrench.
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1.2 Assembly Procedures –VPV 16–164
16 Service and Repair Guide
H
11. For the VPV 45–164, install the thrust screw lock ring by
usingthe adjustable face spanner wrench(Fig. 1.2.3-11).
For the VPV 16–32 use and Allen head wrench to tighten
the thrust screw. See torque rates in Table 11.
Fig. 1.2.3-11
14. Prior to mounting the compensator to the pump body, install
all O-rings on the mating surface of the compensators
first stage (see Fig. 1.2.3-14a).
A light grease or petroleum jelly may be used to retain the
O-ringsduringplacement.Keepthematinginterfaceof the
compensator and the pump housing free of grease. Fig. 1.2.3-14a
13. Lubricatethevaneswithcleanhydraulicfluidandplacethe
vanes in the rotor vane slots (Fig. 1.2.3-13b). The
rounded tips of the vane contact the I. D. of the pressure
ring. Make sure that the direction of the vane tips matches
the direction of pump rotation (see Fig. 1.2.3-13a). The pump
rotation is shown on the pump body and the port plates.
Make sure that the vanes slide freely in the rotor vane slots.
12. Prior to replacing the rotor shaft lubricate it with clean
hydraulic fluid. Replace the rotor shaft (Fig. 1.2.3-12).
Care must be taken not to damage the shaft seal while
inserting the shaft. Verify that the key is not in the shaft.
Fig. 1.2.3-12
Fig. 1.2.3-13b
wercStsurhT–setaReuqroT:11elbaT VPV 23/52/61 /031/001/08/36/54461
wercStsurhT )mN(sbl-ni—069)211( htiwnethgiT hcnerWrennapS
Fig. 1.2.3-13a
R
o
t
a
t
i
o
n
Looking into Pump Body
from Cover Side
Orientation of Vane
Tips are Critical
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1.2 Assembly Procedures –VPV 16–164
Service and Repair Guide 17
H
The O-rings are included both as part of the pump and the compensator repair kit.
Note 9:
When lubricatingO-ringsandtheseals of the compensator,
pleaseuse a minimum amountof grease orpetroleumjelly.
Mount the compensator to the pump and torque the four
socket head cap screws by using the appropriate Allen
wrench (Fig. 1.2.3-14b).
Fig. 1.2.3-14b
15. Install the O-ring on the mating surface of the bias cap/
volume control . A light grease or its equivalent may be
used to retain the O-ring in its groove. Torque the four
socket head cap screws by using the appropriate Allen
wrench (Fig. 1.2.3-15).
Note 10:
When lubricating O-rings and seals of the bias cover
pleaseusea minimumamountofgreaseorpetroleum jelly. Fig. 1.2.3-15
rotasnepmoC–setaReuqroT:21elbaT VPV 61 23/52 08/36/54 461/031/001
)mN(sbl-ni—rotasnepmoC053)14(053)14(086)08(086)08(
revoCsaiB–setaReuqroT:31elbaT VPV 61 23/52 08/36/54 461/031/001
)mN(sbl-ni—revoCsaiB053)14(053)14(086)08(086)08(
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1.2 Assembly Procedures –VPV 16–164
18 Service and Repair Guide
H
16. Insert O-ring on body pilot bore (Fig. 1.2.3-16a). A
light grease or petroleum jelly may be used to hold the O-
ringinplacewhileinstallingthecover.
Fig. 1.2.3-16a
Note 11:
For the VPV 45–164 insert a second O-ring into the
secondary inlet (Fig. 1.2.3-16b).
Fig. 1.2.3-16b
18. Install the cover by inserting the four hex head cap
screws with the appropriate Allen wrench or socket (Fig.
1.2.3-17).
Torque rates see Table 14. Keep the mating surfaces of
the pump body and cover free of oil/dirt/grease before
assemblingthecover.
Fig. 1.2.3-17
revoC–setaReuqroT:41elbaT VPV 61 23/52 08/36/54 461/031/001
)mN(sbl-ni—revoC007)28(0021)041(0081)012(0794)085(
17. Assemble the port plate on to the cover. Assure that
the orientation of the port plate is correct on the
VPV 45-164 pumps, such that the secondary inlet
passages in the cover line up with the small O-ring in the
back of the cover port plate (Fig. 1.2.3-4a, Page 13).
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