Continental Hydraulics PVR50 Flanged Series, PVR50-50B15-RF-0-5-L Service Manual

SERVICE MANUAL

PVR50-

RATINGS

S.U.S 200-250 @ 100°F./C.S.T. 21-30 @ 49°C.

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PVR50 Flanged Series Pump

Installation, Startup, Operating Instructions, Parts Pages, Repair Procedures

“L” Design Series

This service manual applies to products with Ordering
Codes like the sample in Figure 2.

CAUTION - Before performing any service
operation on any pump, be sure that all
pressure has been relieved from BOTH
SIDES of the system.

CAUTION - Before performing any service
operation on any pump, disconnect or lock
off power supply.

CAUTION - Before starting pump, be sure
that any resulting machine function will not
endanger persons or equipment.

PRODUCT IDENTIFICATION

Each pump has an Ordering Code stamped on its
nameplate. See Figure 1 for the location of the
Ordering Code.

Basic Pump

Pump Size

Pressure

Rotation & Mounting

Seal Type

Mechanical Options

Control Options

Integral Operator

Design Letter

PVR50 - _ _ - _ - _ - 5 _ _ _ - L

Figure 2

INSTALLATION

PUMP DRIVE AND MOUNTING

When mounting the pump and motor, care must be
taken to align the pump and motor shafts within .003
T.I.R. Direct inline through a jaw type/flexible web
coupling is recommended for all Continental pumps.
Tire-type flexing elements and chain-type drives are
not recommended. With belt drives, please consult
factory.

To avoid axial and radial end loading of the pump
shaft, do not couple the pump and motor shafts
rigidly. Allow freedom at the coupling for the two
shafts to ride independently.

To prevent end loading, the space between the pump
and motor shaft ends should be 3/4 inch (19.1 mm)
for PVR50 pumps, or as the coupling manufacturer
specifies.

Model Code

50B15-RF-0-521-L

PIPING AND RESERVOIR

The pump should be mounted with a minimum
number of elbows or fittings. The pump suction
should be at least two (2) inch (50.8 mm) tube/pipe
for PVR50 pumps and 2-1/2 inch (63.5 mm) tube/pipe
for PVR50-70B pumps.

Figure 1

Form No. 256827 Rev. 11/08

1

For any system and combination of piping except
High Water Based Fluids (HWBF), the vacuum at the
pump inlet must not exceed seven (7) inches of
Mercury, (5 inch Hg. for fire resistant fluids). HWBF
Pumps are to have a positive inlet head in the range
of 0.5-inch Hg. to 20 inch Hg.

Piping should be done with pickled pipe or seamless
tubing free of dirt and scale. Do not use galvanized
or other pipe that tends to flake off.

A 100-mesh screen (60 mesh for fire resistant and
HWBF) should be used on the pump suction line.
The screen should be located approximately two (2)
inches (50.8 mm) from the bottom of the tank. All
lines returning oil to the tank should discharge at least
two (2) inches (50.8 mm) below the minimum oil level
and should be separated from the pump suction area
by means of a baffle. These lines should also include
a 10-micron return line filter, with the exception of the
case drain line.

The pump case drain should be connected directly to
the tank. Pressure in excess of 10 psi (.7 bar) in the
case drain line can result in shaft seal leakage. It is
recommended that the case drain be returned to the
tank by a separate 1/2-inch (12.7 mm) minimum
inside diameter line.

STARTUP PROCEDURES

The following instructions apply for initial start-up of
the hydraulic pump. After an extended shutdown
period, start with item 5.

CAUTION - Never start a new pump installa­ tion against a blocked system.

5. Rotate pump and motor by hand to insure free
rotation.

6. Set the machine controls to open the circuit and
allow free flow from the pump back to tank or connect
the pump outlet line directly to tank. Jog the motor on
and off several times (on two seconds; off three
seconds) until the pump is primed. Check pump for
proper direction of rotation during the jogging.

7. After the pump has been primed, run it for several
minutes at lower than normal pressures with an open
or intermittently open system which permits oil flow.
This will purge entrapped air from the pump and
system.

8. Neither volume adjustment nor pressure
adjustment should be adjusted until the pump has
been primed and running, and air is purged.

9. After air has been purged from the system, the
system can be closed and the pump adjusted to the
required operating pressure.

10. If necessary, the volume adjustment can be
adjusted to limit maximum output to the desired
amount.

11. When replacing pumps, the suction screen in the
reservoir must be removed and thoroughly cleaned.
Also, the suction line from the reservoir to the pump
should be flushed inside and out to remove any
contaminants. Pieces of metal from a damaged pump
can back up into this line. If they are not removed,
they will be drawn into the new pump and destroy it.
Start unit by using proper pump start-up procedures
as previously stated.

1. Check the nameplate for model number and rpm.
The arrow on the pump casting and/or nameplate
indicates direction of rotation.

2. Pump suction line should extend below the lowest
point of oil level but not less than two (2) inches (50.8
mm) above reservoir bottom.

3. The pump and motor shafts must be aligned within
.003 inches (.08 mm). (See Pump Drive and Mounting
directions above for restrictions).

4. Connect the case drain directly to tank (or to a
heat exchanger if the pump will be deadheading for
long periods of time during operation) using a full-size
line corresponding to the case drain in the pump or
manifold. If connected to a heat exchanger, the case
drain line should be protected with a 10 psi (.7 bar)
maximum relief valve in parallel with the heat
exchanger. No other return lines should be connected
in common with the case drain return.

2

CAUTION - If both pressure and volume
modifications are supplied on the pump, the
pressure should be adjusted before the

volume. Volume should be adjusted at
minimum pump pressure or at deadhead.
Stop adjustment at the volume screw when
pressure begins to drop.

OPERATION

PRESSURE AND VOLUME ADJUSTMENTS
Pressure Control

All pumps (except those with special volume or
pressure requirements) are adjusted to reduced
pressure before shipment and must be readjusted to
the required system pressure after installation and
start-up.

Form No. 256827 Rev. 11/08

The pressure adjusting screw is located at the end
face of the compensator chamber. See parts page
item number 30. The adjusting screw has a right
hand thread; clockwise adjustment of the screw
increases the pressure; counterclockwise adjustment
reduces the pressure.

A pressure gauge located at the pump must be used
when making adjustments to ensure the pressure
settings do not exceed limits specified for the
particular pump or maximum system pressure.

Make all pressure settings with pump operating
against a closed circuit, that is with the output of the
pump blocked, and then check pressure throughout
the pump flow range.

Stop adjustment of the volume screw when pressure
begins to drop. See Sales Catalog for complete
pump performance specifications.

ADJUSTMENT PROCEDURES

To adjust the maximum output volume, use the
following steps:

1. Set the pump at minimum pressure.

2. Hand-tighten the volume screw until it touches the
pressure ring. NOTE: The pump should be at full flow
for this step.

3. See Pressure and Volume Adjustment Sensitivity
chart below.

Volume Control

Adjust volume at minimum pump pressure or at pump
deadhead. The volume adjusting screw is directly
opposite the pressure adjusting screw, see parts page
item number 29. The adjusting screw has a right
hand thread, turning the screw clockwise decreases
the maximum volume, turning the screw
counterclockwise increases the maximum volume.
Pumps are set at maximum rated volume at the
factory unless otherwise specified.

PRESSURE and VOLUME ADJUSTMENT SENSITIVITY

PUMP SIZE 32A15 42A15 50B15 70B15
PRESSURE Press Change/Turn psi (bar) 115 (8.0) 135 (9.4)
ADJUSTMENT Max.Torque ft./lbs.(kg/m) 26.5 (3.7)

VOLUME

ADJUSTMENT
Max. Torque ft./lbs. (kg/m) 28 (3.9) 16 (2.2) 28 (3.9) 16 (2.2)

Flow Change/Turn gpm (lpm) 14 (53.0) 22 (83.0)

Min. Flow Adjust. gpm (lpm) 6.0 (22.7) 8.0 (30.3) 9.5 (36.0) 12.5 (47.0)

PVR50 KIT LIST (Refer to Drawing and Parts List)

WEAR PLATE KIT

Includes Items: 4, 5

Model Kit No.

32A 133046
42A 133047
50B 142209
70B 162073

SEAL KIT

Includes Items: 13, 14, 15, 16, 17, 24, 25,

58, 59, 86, 87, 88 and seals for the

Volume Adj. and Pressure Adj. Screws

Model Kit No.

All Buna-N 124411
All Viton 256826

Model Code Kit No.

32A & 50B 127748
42A & 70B 133048
32A & 50B 13 143735
42A & 70B 13 143736
32A & 50B 21 252295
42A & 70B 21
32A & 50B 22 252415
42A & 70B 22 252414

Model Kit No.

All Models 256803

ROTATING KIT

Includes Items: 3, 6, 21

VANE KIT

Includes Item: 7

4. Deadhead the pump, then turn the volume screw
the proper number of turns to obtain the flow desired.

5. Return pump to flow condition and check flow rate.
If output flow is incorrect, switch pump to deadhead
and readjust per above.

CAUTION - Turning the maximum volume

control in too far can force the pressure ring
over-center and destroy the pump.

COMPLETE REBUILD KIT

Includes Items: All Kits Listed plus Item 11.

Model Code Kit No.

32A 256804
42A 256805
50B 256806
70B 256807
32A 13 256808

Consult Factory

42A 13 256809
50B 13 256810
70B 13 256811
32A 21
42A 21 256813
50B 21 256814
70B 21 256815
32A 22 256816
42A 22 256817
50B 22 256818
70B 22 256819

Consult Factory

Form No. 256827 Rev. 11/08

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