7
Form No. R32.00 Rev. 4/99
PVR-15 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 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. 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 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) counter-
clockwise to release the tension on the governor
spring.
8. Remove the pressure ring (6), spring shoe (11),
governor spring (9), retainer (41) and follow-up
spring (10).
9. If the shaft seals (24) are to be removed they
should be pushed out from the inside of the hous-
ing at this time. Care must be taken not to damage
the journal bearing in the housing while the shaft
seals are being removed. It is recommended that
the shaft seals be replaced whenever the pump is
disassembled for maintenance. The seals cannot
be reused once they have been removed.
10. The journal bearings (21) in the pumps are as-
sembled with a press fit. If they are to be removed
at this time, the bearing in the housing should be
pressed out from the front. The cover bearing
should be pulled out using an expanding type
puller. The bearings should not be reused once
they have been removed.
11. It is unlikely that further disassembly will be neces-
sary 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 bearings (21) in the housing and
cover. The bearing 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 bearing 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 and spring shoe, ring and
rotorshaft.
7. To assure proper vane assembly, place the vanes
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 rings
should be assembled first and the hard seat rings
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.
