PVR6 PUMP REPAIR PROCEDURES
DISASSEMBLY PROCEDURE
NOTE: Disassembling pump to change components,
or for any other reason, may void the warranty. Refer
to Policy Statement and Discounts Summaries.
1. Remove the key (22) in the rotor shaft keyway.
2. A small amount of oil may remain in the pump.
Remove the four cover bolts and slide the cover back
far enough on the shaft to break the seal between the
housing and cover to allow the pump to drain.
3. Remove the cover (2). Take care to avoid damage
to the bearing with the end of the shaft when the
cover is removed.
4. The port plate (4) may come out with the cover. Do
not let it drop off the locating pins.
5. Remove the vanes (7) with a long nosed pliers or
tweezers. There is one vane in each slot, 13 vanes
total.
6. Remove the rotorshaft (3) from the pump. Be sure
that the key (22) has been removed from the keyway
so that it will not damage the shaft seals when the
rotorshaft is removed.
7. Turn the pressure adjustment screw (30)
counterclockwise to release the tension on the
governor spring.
8. Remove the pressure ring (6), ring shoe (11),
governor spring (9), retainer (41) and follower spring
(10).
9. If the shaft seal (24) are to be removed they
should be pushed out from the inside of the housing
at this time. Care must be taken not to damage the
journal bearing in the housing while the shaft seal is
being removed. It is recommended that the shaft seal
be replaced whenever the pump is disassembled for
maintenance. The seal cannot be reused once they
have been removed.
10. The bushings (21) in the pumps are assembled
with a press fit. If they are to be removed at this time,
the bushing in the housing should be pressed out
from the front. The cover bearing should be pulled
out using an expanding type puller. The bushings
should not be reused once they have been removed.
11. It is unlikely that further disassembly will be
necessary in order to perform routine maintenance on
the pump.
REASSEMBLY PROCEDURE
1. Clean and inspect parts to determine which parts
are worn enough to require replacement.
2. Assemble the new bushings (21) in the housing
and cover. The bushing OD's should be lubricated
before they are pressed in the bores. Care must be
taken to orient the "split" and the "oil groove" in the
bushing as shown in the illustration below.
3. After the bearings are in place, check to see that
the rotor shaft will fit into the bearings and provide a
smooth turning fit. If the shaft turns hard, the
bearings should be removed and the bore checked
closely for nicks or burrs before pressing in the new
bearings.
4. Check all of the replacement parts for nicks or
burrs and then lubricate them with clean oil before
reassembly.
5. Worn port and thrust plates should not be
reground to clean up the wear surface. If the plates
are ground, the assembly clearance will become
excessive and the seal rings in the thrust plate may
rupture. Replace worn port and thrust plates if
necessary.
6. Assemble the springs (9, 10) and ring shoe (11),
pressure ring (6) and rotorshaft (3).
7. To assure proper vane assembly, place the vanes
(7) with the beveled edge out against the pressure
ring.
8. Assemble the square seal rings into the cavity in
the back of the thrust plate. The soft rubber seal ring
(15) should be assembled first and the hard seat ring
(13) should be assembled on top of them. Stretch the
larger soft seal ring slightly so it clings to the ID at the
cavity. Apply clean oil or STP to the back of the thrust
plate before it is placed in the locating pins in the
body to help hold the parts together while they are
assembled.
9. Before fitting the cover into the housing, check to
assure that the bore in the port plate is concentric to
the bearing bore in the cover. If the bores are not
concentric, the port place must be relocated 180° on
the locating pins
.
Form No. 265664 Rev. 11/08
6
Spring Housing
CL
CL
Oil Groove Positions
Thrust
Screw
Item #21
Bushing Orientation
