Form No. R92.00 Rev. 10/03
1
CAUTION – Before performing any service
operation on any pump, be sure that all
pressure has been relieved from the system.
CAUTION – Before performing any service
operation on any pump, disconnect or lock
off power supply.
CAUTION – Before starting any pump, be
sure that any resulting machine function will
not endanger persons or equipment.
PRODUCT IDENTIFICATION
Each HPV Piston Pump has a Model Code stamped
on its escutcheon plate. See Figure 1 for the location
of the Model Code.
This Service Booklet applies to products with Model
Codes like the sample in Figure 2.
GENERAL SPECIFICATIONS
MOUNTING
Any unrestricted mounting position acceptable.
Horizontal mounting preferred. The mounting hub
and two-bolt mounting flange conform to SAE
mounting standards.
Continental Hydraulics does not recommend direct
rigid connection of piston pumps to the Prime Mover.
Use of a flexible coupling, a coupling that allows for
minor misalignment is recommended.
If the shaft connection to the Prime Mover is rigid, the
mounting face diametric concentricity and squareness
must be within .001 inch (0.03 mm) T.I.R. for a flange
mounted pump.
The HPV Piston Pump is designed for in-line drive.
Angle drive creates side loads on the shaft, and is not
acceptable.
SHAFT INFORMATION
Splined:
The coupling interface must be lubricated.
Continental Hydraulics recommends lithium
molydisulfate, or similar grease. The female coupling
should be hardened to 27-45 Rc, and must conform
to ANSI B92.1 Class 5 Fillet or Flat Root Side Fit.
Keyed:
High strength heat treated keys must be used.
Replacement keys must be hardened to 27-34 Rc.
Key corners must be chamfered .030 - .040 inch (.75
- 1.0 mm) at 45° to clear radii in the keyway.
PLUMBING
Connect inlet and outlet lines to the pump’s cover.
HPV fluid connections are SAE straight thread, SAE
flange or BSPP.
Maximum case pressure is 10 psi (0.70 bar). Case
pressure must never exceed inlet pressure by more
than 15 psi (1.0 bar). To prevent fluid drain-down
from the pump when idle, make certain that case
drain plumbing passes above the highest point of the
pump before entering the reservoir. Or, install a 5 psi
(.3 bar) case pressure check valve to assure that the
pump is always filled with hydraulic fluid.
The case drain line must be big enough to prevent
back pressure in excess of 10 psi (0.70 bar).
SERVICE MANUAL
HPV Axial Piston Pumps
Model
Code
Figure 1
“B” Design Series
Basic Pump
Rotation
Seal Type
Ports
HPV - 6B35-RF-O-1R
Figure 2
Date
Code
MODEL
REAR PORT
SIDE PORT
HPV-6
SAE-12 or 3/4” BSPP
SAE-16 or 1” BSPP
HPV-10
SAE-20 or 1-1/4” BSPP
SAE-20 or 1-1/4” BSPP
HPV-15
SAE-20 or 1-1/4” BSPP
SAE-20 or 1-1/4” BSPP
HPV-20
SAE-20 or 1-1/4” BSPP
SAE1-1/4” Flange*
HPV-29
SAE-20 or 1-1/4” BSPP
SAE1-1/2” Flange**
* Per Code 62
** Per Code 61
