PVR15 PUMP REPAIR PROCEDURES
DISASSEMBLY PROCEDURE
NOTE: Disassembling a 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 (18) 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 (23).
5. Remove the vanes (7) with a long nosed pliers or
tweezers. There are two vanes in each slot, 26 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), spring retainer (41) and follower
spring (10).
9. If the lip seals (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 lip seals are being
removed. It is recommended that the lip seals be
replaced whenever the pump is disassembled for
maintenance. The seals cannot be reused once they
have been removed.
10. The journal 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 bushing 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 bushings are in place, check to see that
the rotor shaft will fit into the bushings and provide a
smooth turning fit. If the shaft turns hard, the
bushings should be removed and the bore checked
closely for nicks or burrs before pressing in the new
bushings.
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 four seal rings into the cavity in the
back of the thrust plate. The soft rubber o-rings (14,
16) should be assembled first and the hard square
seal rings (13, 15) should be assembled on top of
them. Stretch the larger soft o-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
.
Spring Housing
C
L
C
L
Oil Groove Position
Thrust
Screw
Item #21
Bushing Orientation
7
Form No. 265294 Rev. 07/08
Summary of Contents for F Design Series
Page 3: ......
