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⚠️⚠️warn! ! !
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. Clean the outside of the unit thoroughly to prevent entry of dirt into the system.
Absolute cleanliness is essential when working on a hydraulic system. Always work in a clean area. The presence of dirt and foreign materials in the system can result in serious damage or inadequate operation. Periodic maintenance of the pump will generally not require disassembly to the extent described here.
vickers vane pump Troubleshooting
Troubleshooting is one of the best virtues to acquire if you are an industrial pump repair technician. All in all, troubleshooting is a process. Firstly, you have to define the problem, gather information, and analyze data that will help you solve the problem, implement the solution and check if it worked for you or not. This form collects vickers vane pump problems, symptoms, and solutions！
| TROUBLE | PROBABLE CAUSE | REMEDY |
| Excessive pump noise | 1.Vacuum condition 2.Low oil level in the reservoir 3.Air in the system 4.Oil too thick 5.Cold weather | 1.Fill reservoir to proper level with the recommended transmission fluid. DO NOT over fill transmission or damage may result. 2.Open reservoir cap and operate hydraulic system until purged. 3.“Bleed” hydraulic lines at highest point downstream of auxiliary pump and while system is under pressure. 4.Check inlet (suction) lines and fittings for air leaks. 5.Check auxiliary pump function. 6.Be certain correct type of oil is used for refilling or adding to the system. 7.Run hydraulic system until unit is warm to the touch and noise disappears. |
| Pump overheating | 1.Internal leakage 2.Heat exchanger not functioning 3.Fluid level low | 1.If established that excessive internal leakage is evident, return vehicle to maintenance shop for evaluation and repair. 2.Locate trouble and repair or replace. 3.Add oil to operating level. |
| System not developing pressure | 1.Relief valve open 2.Compensator misadjusted 3.Loss of fluid internally (slippage) | 1.Replace one or both. Do not attempt to repair cartridges, they are factory assembled and preset. 2.Return vehicle to maintenance shop for repair of hydraulic system. |
| Loss of fluid | 1.Ruptured hydraulic lines 2.Loose fittings 3.Leaking gaskets or seals in pump or circuit | 1.Check all external connections, tubing and hoses. Tighten connections, replace ruptured tube or hose. 2.Observe mating sections of hydrostatic transmission for leaks. 3.Replace seals or gaskets if possible. |
| Miscellaneous | 1.Sheared shaft key 2.Disconnected or broken drive mechanisms | Locate and repair |
Disassembly
Removal and Disassembly of the Compensator S/A
a. Remove four screws (1) that hold the compensator S/A to valve block (26) and pull the compensator away from the valve block.
b. Remove compensator gasket (2) and O-Ring (3) from body (11) of compensator S/A.
c. Remove lockwire (4), plug (5) and O-Ring (7) (6 and 7 on the CV compensator).
d. Remove spring (8), seat (9), and spool (10) from the compensator body (11) and set aside for inspection.
e. Do not remove plug(s) (24) unless it is necessary for inspection of the bore.
f. Unscrew plug (12) and remove parts (13) through (18).
g. Remove plug (19) to gain access to orifice plug (20). Remove orifice plug (20). Do not remove check valve S/A (21) from body (11). Item (20) may or may not be an ori- fice. If the circuit has a bleed down, orifice (20) may be a plug.
h. Remove plug (22) and O-Ring (23).
i. Remove plug(s) (24) only if necessary to inspect the spool bore.
NOTE
All parts must be thoroughly cleaned and kept clean during inspection and assembly. The close tolerance of the parts makes this requirement very important. Clean all removed parts using a commercial solvent that is compatible with the system fluid. Compressed air may be used in cleaning, but it must be filtered to remove water and contamination. Clean compressed air is particularly useful in cleaning the spool, compensator body, and valve block passages.
Inspection Repair and Replacement
Replace all parts that do not meet the following specifications.
1.Inspect all components for excessive wear, erosion, and/or seizure.
2.Inspect plugs (5), (12), (19), (20), (22) and (24) for damaged threads, burrs, etc. Make sure orifice hole is open in plug (20). Replace if defective.
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. If scratches exist across the spool land, replace the spool and inspect the body bore. Rotate the spool while moving in and out of the bore to check the binding. Binding cannot be tolerated. If binding is evident, use an India stone to break the sharp edges of the balancing grooves. Use 500 grit paper lightly on the outer surface of the spool. Clean in solvent and lubricate, then try the bind test again. If bonding persists, replace the spool and/or body.
6.Inspect the screws for damaged threads. Replace all damaged threads. Replace all damaged screws.
7.Inspect the load sensing section of the CVP compen- sator as follows:
a. Inspect the load sensing section of the CVP com- pensator if wear is evident. Clean up burrs with an India stone.
b. If wear is evident, replace the part. Note: After assembly the compensator must be readjusted to the correct pressure. Refer to the test procedure Section VII for instruc- tions on compensator adjustment.
c. Discard adjusting screw (14). Check seat (17) and spool (18) for wear. Refer to step B.5 for procedure when checking the pressure limiting spool.
d. Inspect body S/A (11) bores for scratches. Make sure the orifice plug (20) opening is clear.
| Item | Description | Qty | ltem | Description | Qty | ltem | Description | Qty |
| 70 | O-ring | 1 | 27 | Housing | 1 | 51 | Shim | 2 |
| 71 | Retaining Ring | 1 | 73 | Piston Rod | 1 | 52 | O-ring | 2 |
| 25 | Screw | 5 | 72 | Piston | 1 | 53 | Spacer | 2 |
| 67 | Plug | 1 | 43 | Piston & Shoe S/A | 9 | 54 | Bearing Race | 2 |
| 68 | O-ring | 1 | 42 | Shoe Plate | 1 | 55 | Bearing | 2 |
| 69 | Plug | 1 | 41 | Shperical Washer | 1 | 56 | Yoke | 1 |
| 74 | O-ring | 1 | 40 | Pin Retainer | 1 | 57 | Roll Pin | 1 |
| 29 | Pin | 2 | 39 | Pin | 3 | 58 | Seat | 1 |
| 64 | Seat | 1 | 35 | Retaining Ring | 1 | 59 | Seat | 1 |
| 65 | Valve | 1 | 36 | Spring Washer | 1 | 60 | Spring | 1 |
| 66 | Spring | 1 | 37 | Spring | 1 | 44 | Retaining Ring | 1 |
| 31 | Pin | 2 | 38 | Spring Washer | 1 | 48 | Shaft | 1 |
| 32 | Bearing | 1 | 34 | Cylinder Block | 1 | 47 | Retaining Ring | 1 |
| 26 | Valve Block | 1 | 49 | Screw | 8 | 61 | Bearing | 1 |
| 28 | Valve Plate | 1 | 50 | Cover | 2 | 47 | Retaining Ring | 1 |
| 30 | Gasket | 1 | 45 | Shaft Seal | 1 |
| Figure & Index No. | Description | Units per Assembly |
| 1 | Screw | 4 |
| 2 | Gasket | 1 |
| 3 | O-Ring | 1 |
| 4 | Lockwire and Seal | 1 |
| 5 | Adjusting Plug | 1 |
| 6 | Back-Up Ring | 1 |
| 7 | O-Ring’ | 1 |
| 8 | Spring (pressure limiter) | 1 |
| 9 | Seat | 1 |
| 10 | Spool (pressure limiter) | 1 |
| 1’1 | Body (compensator) | 1 |
| 12 | Plug | 1 |
| 13 | O-Ring | 1 |
| 14 | Adjusting Screw | 1 |
| 15 | Seat | 1 |
| 16 | Spring (load sensing) | 1 |
| 17 | Seat | 1 |
| 18 | Spool (load sensing) | 1 |
| 19 | Piug | 1 |
| 20 | Orifice Plug | 1 |
| 21 | Check Valve S/A | 1 |
| 22 | Plug | 1 |
| 23 | 0-Ring | 1 |
| 24 | Plug | 1 |
| 25 | Screw | 1 |
| 26 | Valve Block | 1 |
| 27 | Housing | 1 |
| 28 | Wafer Plate | 1 |
| 29 | Pin | 1 |
| 30 | Gasket | 1 |
| 31 | Roll Pin | 2 |
| 32 | Bearing | 1 |
| 33 | Bearing Spacer Kit | 1 |
| 34 | Cylinder Block | 1 |
| 35 | Retaining Ring | 1 |
| 36 | Washer (notched) | 1 |
| 37 | Spring | 1 |
| 38 | Washer (pin) | 1 |
| 39 | Pin | 1 |
| 40 | Pin Retainer | 1 |
| 41 | Spherical Washer | 1 |
| 42 | Shoe Plate | 1 |
| 43 | Piston and Shoe Subassembly | 1 |
| 44 | Retaining Ring | 1 |
| 45 | Shaft Seal | 1 |
| 46 | Shaft Key | 1 |
| 47 | Retaining Ring | 1 |
| 48 | Shaft | 1 |
| 49 | Screw | 4 |
| 50 | Pintle Cover | 2 |
| 51 | Shims(kit) | 1 |
| 52 | O-Ring | 2 |
| 53 | Bearing Spacer | 2 |
| 54 | Bearing Race | 2 |
| 55 | Bearing | 2 |
| 56 | Yoke | 1 |
| 57 | Roll Pin | 1 |
| 58 | Seat | 1 |
| 59 | Seat | 1 |
| 60 | Spring | 1 |
| 61 | Bearing(shaft) | 1 |
| 62 | Bearing Race | 1 |
| 63 | Bearing Race | 1 |
| 64 | Seat(check valve) | 1 |
| 65 | Check Valve | 1 |
| 66 | Spring (check valve) | 1 |
| 67 | Plug | 1 |
| 68 | O-Ring | 1 |
| 69 | Plug | 1 |
| 70 | O-Ring | 1 |
| 71 | Snap Ring | 1 |
| 72 | Piston | 1 |
| 73 | Piston Rod | 1 |
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Assembly of Compensator
Replace the gaskets and O-Rings removed from the unit with those supplied in the seal kit.
DO NOT use grease to hold the seals in place. Use a viscosity improver (STP or equivalent). Flood all parts with system fluid to provide initial lubrication and prevent seizure. Assembly of the parts will be in the reverse numerical sequence. Special procedures are included in the following steps.
The following step refers to the CVP or CVPC compensator only.
1.Install parts (24) through (22) into body (11).
a. Install parts (20), (19), and spool (18). Make certain the spool does not bind or hang up in the body bore.
b. Assemble parts (17) through (15) together. Insert the assembled parts (seat first) into compensator body (11). Assemble with spool bores in vertical position to prevent seat from falling into cross port. Visually observe proper assembly through load sensing port. The seat must rest against com- pensator spool (18) at completion of assembly.
c. Thread adj. screw (14) into body (11) bore until top of adj. screw is .065 below body (11) surface.
d. Install O-Ring (13) over plug (12) and thread plug(12) into compensator body (11).
2.Install plug (24) into the “C” and “CV” compensator bodies. Plugs were installed into the “CVP” compensator body during the preceding step.
3.Install parts (10) through (3) into compensator body (11). Make certain the spool (10) does not bind within the bore. Refer to procedure established in step B.5 for further information. Lockwire and seal (4) will be installed during test procedure section VII.
4.Install gasket (2) in place in the face of compensator body (11). Cover the compensator body with clean Kraft pa- per and set aside for final assembly of the pump.
NOTE
Read justment of the pressure limiter and load sensing compensators is required.
Removal and Disassembly of Rotating Group
1.Remove the six screws (25) which hold pump housing(27) to valve block (26).
2.Pull valve block (26) away from housing (27) then discard gasket (30).
3.Remove wafer plate (28) and pins (29) from the valve block set aside for inspection.
4.Remove bearing (32) and bearing spacer (33 on PVE 19/21 models) from the end of drive shaft (48).
5.Slide the rotating group from the pump housing. (Hold the shoe plate with both hands during removal to prevent the group from separating.)
6.Separate the rotating group components and set aside for inspection. Use care when handling these close tolerance parts to prevent burrs from forming.
NOTE
The rotating group consists of a cylinder block S/A(34), nine piston and shoe subassemblies (43), a shoe plate (42), a spherical washer (41), three pins (39), and a pin retainer (40).The spring located within the cylinder block S/A is under a high tension and can cause bodily harm if the retaining ring is removed.
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.Inspect cylinder block S/A face (34) for wear, scratches and/or erosion between cylinders. Check the spring, washers and retaining ring located within the cylinder block S/A.
4.Check each cylinder block bore for excessive wear. Use the piston and shoe subassemblies (43) for this purpose. The piston should be a very close fit and slide easily in and out of the bore. No bind can be tolerated. If binding is evident, clean the cylinder block and piston, lubricate with clean hy- draulic fluid and try again. Even minor contamination of the fluid could cause the piston to freeze up in the cylinder bore.
5.Inspect each piston and shoe subassembly (43) for a maximum end play of 0.005 inch between the piston and shoe.
6.The face thickness dimension of each shoe must be within 0.001 inch of each other.
7.Inspect shoe plate (42) for excessive wear and cracking in the area of spherical washer (41). If heavy wear or cracks are found, replace the shoe plate and spherical washer at the same time.
8.Check spherical washer (41) for burrs, wear, and possible scratches due to pin breakage. Replace if wear is excessive.
9.Inspect pins (39) for equal length, excessive wear and possible bending. Replace all pins simultaneously if one is defective.
10.The pin retainer (40) may develop burrs. Remove all burrs with an India stone.
11.Inspect the face of the wafer plate (28) for excessive wear, scratches, and possible fracture. If the wafer plate is fractured, make sure the new plate rests flat against the valve block at assembly and that wafer plate pin (29) does not extend too far and hold the wafer plate away from the valve block.
12.Inspect pump drive shaft (48) for wear, chipped splines and burrs. Remove burrs with an India stone.
13.Inspect shaft bearing (61) for brinelling, pitting of the rollers, and roughness when turned in race (62) located in the housing. If the bearing is defective, both the bearing and the race must be replaced. If the bearing shows no evidence of wear, do not remove the bearing race from the housing or the bearing from the shaft. If the bearing requires removal.
14.Inspect yoke (56) face for wear, roughness or scoring.
a. Remove the four screws (49) that hold pintle covers (50) on each side of the housing. Remove the pintle covers. Be careful not to damage the shims which lie directly under the covers.
b. Retain shims (51), if possible, and use a micrometer to measure the total shim thickness. If the bearings are not defective, the same shims or a new shim of the same thickness will be needed to preload the bearings at installation. Remove O–Rings (52) and bearing spacers (53) from each pintle.
c. Slide the yoke from side to side to loosen the yoke bearing races (54) within the housing. The races are a normal slip fit but may be tight. Use an open end wrench between the yoke and the pintle bearing to help slide out the races. Apply pressure to bearing (55) at the approximate center and allow the bearing rollers to gently press the race out of the housing.
15.Remove yoke (56) and drive shaft (48) from the housing together. Turn the yoke at an angle and slide the two parts out of the housing. See Figure 15.Figure 15. Removal of Yoke and Shaft from Housing.
16.After removal of yoke from the housing, remove seat(59) and yoke spring (60). Seat (58) and rollpin (57) will be attached to the yoke (56). Do not disassemble further unless seat (58) is damaged.
17.Remove bearing (61) from shaft (48) with the nine inch piece of 1 1/2” heavy wall tubing shown in Figure 9. Press off with an arbor press.
18.Remove bearing race (62) from housing (27) as shown in Figure 16. Use special tool shown in Figure 10.For units without shaft seal, omit shaft seal removal and installation procedure.
19.Remove retaining ring (44) then press shaft seal (45) from pump housing (27).If yoke (56) and front shaft bearing (61) were not defective, perform the following step.
20.Remove and replace shaft seal (42) located within housing (27) as follows: (Refer to figure 17.)For units without a shaft seal, this step will be used to remove a defective drive shaft only. In addition, references to shaft seal installation and removal must be omitted.
a. Install a nine inch piece of 1 1/2” heavy wall tubing over drive shaft (48) within the housing. The end of the tub- ing will rest against the inner race of tapered roller bearing (61) and extend out beyond the end of the pump housing. Place the complete unit with tubing into an arbor press with drive spline up. Press the drive shaft through the bearing and out of the unit. A 0.001 press exists between the shaft and bearing so considerable force is required to remove the bearing. See Figure 17 (PVE19/21).
b. Remove retaining ring (44) and pull shaft seal (45) from housing (27). Be careful not to damage the aluminum die cast housing in the seal area.
c. Press drive shaft (48) into shaft bearing (61) as follows: Use a short piece of 1 1/2” inch heavy wall tubing (approximately 6” long) over the drive spline of the shaft. The tubing must be long enough to go through the shaft seal end of the pump and make contact with the inner race of the front bearing. Press the shaft through the bearing with an arbor press until the bearing bottoms against the shoulder of the shaft (snap ring on the PVE12). See Figure 18.
d. Remove the short piece of tubing and turn shaft bearing (69) in its race with the end of the shaft. The bearing rollers must turn free and smooth.
e. Tape the spline end of drive shaft (48) with plastic tape to prevent cutting new shaft seal (45). Start taping the shaft close to the housing and work toward the end of the shaft. Install a new shaft seal in position over the shaft and press evenly into the housing. 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.
NOTE
Normally a wear pattern will exist on seat (58). If the seat is damaged or shows heavy wear, replace seat (58) and (59) and rollpin (57).If drive shaft (48) is defective, perform step F.17. If front bearing (61) was defective, perform steps F.17 and 18.
Assembly of Housing Parts
If a new shaft bearing (61), shaft (48), valve block (26), or housing (27) is required, a complete preload adjustment must be performed. If the same parts are returned to service, the preload adjustment can be omitted. The same procedure applies to yoke (56) and its associated bearings.
1.If the shaft bearing (61) requires replacement, install a new bearing race (62) into housing (27). Use tool shown in Figure 11 to press bearing race in place. Make sure the bear- ing race (62) is oriented properly to accept the roller bearing before pressing into the housing. The race must be bottomed against the shoulder of the housing at completion of press.
2.Place housing (27) on a flat surface with the shaft seal end down. Lay the front shaft bearing (61) into the race. Install yoke spring (60) and seat (59) into the housing.
3.Position the yoke pintle properly and install yoke into housing. Assemble the yoke bearings, races, and spacers as follows.
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). Install four pintle cover screws (49) and torque to175–185 lbf. in.
d. Set housing (27) on its side so the other pintle is up. Install bearing spacer (53) and rotate the yoke back and forth to seat bearings (55) within the bearing races. With spacer (53) fully in against the bearing race, measure the height of the spacer with respect to the housing pintle face in two places (180 apart). Use a depth micrometer to perform this measure- ment. See Figure 19. Average the readings to obtain a nominal value. A 0.007-0.009 inch preload is required of the pintle bear- ings. Calculate the necessary shims to provide this preload as follows: Assume the depth readings were 0.029 and 0.027 inch. Add the two figures together and divide by two to obtain the average. In this case the average calculated is 0.028 inch. Subtract the nominal preload of 0.008 inch from the calculated average to obtain the required shim thickness.
e. Install the correct shims (51) and cross torque pintle cover (50) screws to 175–185 lbf. in.The yoke (56) will be stiff but should be loose enough to be moved by hand (approximately 20 lb. in. torque). The tightness/drag indicates the bearings are preloaded. If the yoke cannot be moved by hand, the preload is too great. Repeat the preload adjustment until correct.. Measuring height of pintle bearing spacer with respect to the pintle face.
4.Assemble the rotating group and install into housing as follows:
a. Assemble the spring, two washers and retaining ring into the cylinder block. The washer with three notches is assembled next to retaining ring. See Figure 14 for instruc- tions. Set the cylinder block S/A (34) face on a flat clean surface. Use Kraft paper between the block and surface to prevent scratching the cylinder block face.
b. Install pin retainer (40) into cylinder block. Position the pin retainer approximately 1/4” below the surface, and orient the open end of the pin retainer to be away from the large spline openings.
c. Slide the three pins (39) into cylinder block S/A (34) until they bottom against the spring washer within the block.
d. Place spherical washer (41) on top of the three pins, then install shoe plate (42) with nine piston and shoe subassemblies (43) over spherical washer (41) and into cylin- der block. Wobble shoe plate (42) to make sure that each piston is free within its bore in the cylinder block.e. Set housing (27) on its side and hold pump shaft (48) horizontal. Slide rotating group into the housing. Rotate the shaft to match the shaft splines to the cylinder block and spherical washer.
5.If alignment pins (31) were removed, install two align- ment rollpins (31) into housing (27). Place gasket (30) over the rollpins, cover with Kraft paper and set aside for final assembly.
NOTE
If the calculated shim thickness is greater than 0.020, another shim must be added to the opposite side of the yoke to reduce the total shim thickness to less than 0.020. Shim thickness at either pintle must not exceed 0.020. This is necessary to provide proper O-Ring compression and prevent pintle seal leakage.
Disassembly of Valve Block
1.Do not disassemble check valve parts (64) through (66), unless action of the valve indicates a problem. Check the valve action with a pencil or a screwdriver. Press the check valve in against the spring, it should return and hold firm against the seat. If the check valve is defective, remove and replace the complete assembly. Press new seat (64) flush with face of valve block. DO NOT scratch the face of valve block (26).
2.Remove parts (67) through (73) from valve block (26).
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 PVEG units. Use tool shown in Figure 10a and procedure shown in Figure 20a for PVE units with a blind hole in valve block (26). BE CAREFUL not to scratch face of the valve block during removal of the race.
Inspection, Repair, and Replacement
1.Clean all parts and place them on a clean sheet of Kraft paper for inspection. Follow general procedure noted in paragraph VI. GENERAL.
2.Inspect the threaded plugs for worn corners on the hex head, stripped threads and burrs in the O–Ring groove. Use an India stone to remove burrs. If threads are defective, replace the plug.
3.Inspect compensator piston rod (73) for nicks and burrs. Remove burrs and sharp edges with an India stone.
4.Inspect compensator piston (72) for wear at the area of yoke contact. The compensator piston and the piston rod are a close tolerance fit and must assemble together without evidence of wear or bind. Rotate the piston through 360 when checking for bind.
5.Inspect valve block (26) for burrs, nicks, plugged body passages, flatness of the pump wafer plate area and porosity. Inspect check valve seat (64). Make sure the seat is tight with- in the valve block and does not protrude above the valve block face. Repair or replace the valve block if defective.
Assembly of Valve Block
Refer to Figure 13 during the following assembly procedures.
1.If bearing (32) was defective and bearing race (63 for the PVE19/21) has been removed, a new bearing race must be installed into the valve block. Refer to Figure 21 and press a new bearing race in place with an arbor press. The bearing race must bottom against the shoulder of valve block at completion of press.
2.Install pipe plug (69) into valve block (26) and secure.
3.Assemble a new O—Ring (68) on hex plug (67) and thread plug into place.
NOTE
Check flatness of the valve block face in the areaaround each locating pin hole (31) and at bolt open-ings (25). Use an India stone to remove burrs or raised metal in these areas.
Shaft Bearing Preload Adjustment
If the shaft bearings, shaft, valve block or housing were not replaced, use the bearing spacer removed during the disassembly procedure to preload the shaft and perform step K.7. If preload adjustment is necessary, perform steps K.1 through K.7.
1.Install the thickest bearing spacer (33) over shaft (48) with the chamfer facing into the housing (toward the shoulder on the shaft).
2.Slide new bearing (32) on the shaft and up against spacer (33). The small diameter of the tapered roller bearing must face out of the housing.
3.Install housing (27) to valve block (26) without gasket (30) and rotating group. Turn shaft (48) to seat the bearings then torque the six housing attaching screws (25) to 5 lbf. in. Check the opening between the valve block and housing to be as even as possible after tightening.
4.Use a feeler gauge to measure the opening between valve block (26) and housing (27). Four measurements should be obtained equidistant around the unit. A tapered feller gauge is especially useful for this purpose. Average the four readings by adding them together and dividing by 4.
| + | 0.150 | Measured thickness of bearing spacer |
| — | 0.027 | Average gap (estimated) |
| + | 0.003 | Preload setting |
| + | 0.020 | Compressed thickness of gasket |
| = | 0.1460.001 | Required bearing spacer thickness to provide a 0.003.001 bearing preload. |
5.Remove six mounting screws (25) then remove hous- ing (27) from the valve block.
6.Remove bearing (32) and bearing spacer (33).
7.Locate a bearing spacer with calculated dimensions and place next to the new bearing on the shaft. Chamfer must face shoulder on shaft. Use the original spacer and bearing if preload is not performed. Set aside for final assembly.
Final Assembly of the PVE Series Pump
Lubricate all moving parts of the piston pump with system fluid to facilitate assembly and provide initial lubrication. Pour system fluid liberally over the rotat- ing group and wafer plate as these parts are without lubrication until the pump primes.
1.Assemble wafer plate locating pin (29) into valve block (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.
3.Place valve block (26) on its side. See Figure 13 for position required.
4.Install compensator piston rod (73) into valve block (26) and attach spirolox retaining ring (71).
5.Install a new O-Ring (70) in the compensator piston rod O-Ring groove.
6.Install compensator piston (72) over compensator piston rod (73).
7.Assemble housing (27) and valve block (26) together as shown in Figure 13. Thread six screws (25) hand tight through the housing into the valve block. Cross torque the screws to bring the valve block and housing together against gasket (30). Final torque screws (25) to 31–35 N.m (23–26 lbf. ft.) for the PVE19/21 and 22-27 N.m. for the PVE12.
8.Check the shaft torque to verify correct bearing pre- load. If the torque exceeds eight (8) N.m (6 lbf. ft.), perform a shaft bearing preload adjustment, Section VI.K. and repeat steps VI.L.7 and 8.
9.Determine shaft rotation from the model code stamped on the mounting flange. Refer to Figure 7 and mount the compensator subassembly. Thread four screws (1) through the compensator into valve block (32). Cross torque screws to 7–8 N.m (60–70 lbf.in.).
NOTE
The wafer plate must be flat against the valve block face. Check to make sure it does not rock back and forth. If rocking of the wafer plate occurs, check locating pin (29), it may not be bottomed out in the valve block. Rocking of the wafer plate will induce high stress conditions across the wafer plate and cause fractures to appear.
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