Cleaning; Inspection, Repair And Replacement; Assembly - Eaton Vickers 2520V-20-282 Series Overhaul Manual

11. Pull the shaft group (items 32 through 34) from body
(38). If bearing 933) or shaft (34) need replacement, remove
retaining ring (32) with retaining ring pliers. Remove bearing
(33) from shaft (34) by using an arbor press. Apply pressure
to the inner race when removing bearing.
12. Remove washer (35) and "O" ring (36) from body (38).
13. Drive shaft seal (37) out of mounting end of body.
D. Cleaning
All parts must be thoroughly cleaned and kept clean during
inspection and assembly. contamination of the unit will cause
excessive wear, leakage and decreased service life. Use a
commercial solvent which is compatible with the system
fluid. Thoroughly clean all parts. Drying parts with com-
pressed air after cleaning is not recommended, unless the
air is completely filtered to remove water and contamination.
E. Inspection, Repair and Replacement
Check all internal passages. Make sure they are clean and
unobstructed. Examine all mating surfaces for nicks and
burrs. check locating pins and holes for wear and burrs.
Check the condition of threaded parts and threaded holes.
Check all snap ring recesses. Minor burrs can be removed
with an India stone. Replace any part which shows wear or
damage. The following parts are subject to special attention.
1. Cartridge kits (6 and 20). In order to obtain maximum
overhaul life of the pump, a complete cartridge kit should be
installed if wear or scoring is noticed during the following
inspection.
a. Inspect the mating surfaces of the rotors (15 and
28), outlet support plates (17 and 30) and inlet support
plates (12 and 25) for wear and/or scoring.
b. Inspect the vanes and inserts (16 and 29) for
burrs, wear and play in the slots of the rotors (15 and 28).
Remove minor burrs with an India stone.
c. Inspect bushing for wear and scoring (Figure 4).
2. Check the bearing (33) for wear, looseness and pitted
or cracked races.
3. Inspect the seal and busing mating surfaces on the
shaft for scoring and wear. Replace the shaft if marks cannot
be removed by light polishing.
4. Remove burrs from outer edge of ring (17). Place
rotor (15) and ring (27) on a flat surface. Measure ring/rotor
clearance with a dial indicator. Ring/rotor clearance are
noted in Table 4.
Model
**20V
**25V
**35V
25**V
35**V
45**V
Table 4. Minimum allowable ring rotor clearance
Min. Clearance
limit in inches
0.0007
0.0012
0.0015
0.0012
0.0015
0.0016
F. Assembly
Refer to the parts and service drawing listed in Table 1 for
replacement parts. Always replace old seals with new seals
when overhauling a unit. If a cartridge kit needs replace-
ment, new cartridge seals are included as part of the kit.
Apply a light film of hydraulic fluid to all component parts to
facilitate assembly and provide initial lubrication. Install parts
in the reverse order of disassembly (Figure 8).
1. Position seal (37) garter spring toward the inside of
body (38) and press in place with shaft seal driver (Figure 5).
2. Install washer (35) into body (38).
3. If required, press bearing (33) on shaft (34) and
secure with retaining ring (32). Use an arbor press for this
operation and apply force to the inner race area.
4. Check the keyway end of shaft to make certain it is
free from nicks and burrs. A small nick or burr can damage
the shaft seal during installation. Coat the keyway portion of
the shaft with hydraulic fluid. Carefully install the shaft group
(items 32 through 34) through the seal and into body (38).
Spread spirolox ring (31) and feed it into the groove located
behind the bearing. This will secure the shaft group within
body (38).
5. Install sealing ring (23) into body (38).
6. If cartridge kit (20) is replaced with a new kit, install
the kit into body (38). If cartridge kit requires assembly,
assemble in reverse order of disassembly (Figure 8). During
assembly, note the following precautions.
a. Make sure the arrows on rotor (28) and ring (27)
are in the direction of pump rotation.
b. Make certain that sharp edges of vanes (29) lead
in the direction of rotation (Figure 7).
Inlet
Rotor
Sharp edges
lead direction
of rotation
Figure 7. Positioning vanes in rotor
Direction of
rotation
Ring
Vane
9