Denison P7 hydraulic pump 002764-011 002764-013 002764-029 for the Sandvik rock drilling rig

The Denison P7 is part of Parker Denison’s Gold Cup series of axial piston pumps — a product line that also includes the P6, P8, P11, P14, P24, and P30 frame sizes. These are closed-loop, variable-displacement pumps built for hydrostatic transmission duty: driving track motors, rotation heads, feed systems, and winches on heavy equipment where torque demand swings constantly and reliability can’t be negotiated.

On Sandvik drilling rigs — models like the D75KS and D50KS series show up most often in field reports — the P7 typically serves as the primary hydrostatic drive pump, paired with a matching Gold Cup motor to move the rig or drive rotation. It’s a workhorse component, not an accessory part, which is exactly why a failure grounds the whole machine.

Understanding the Sandvik Part Numbers: 002764-011, 002764-013, 002764-029

This is where a lot of buyers get tripped up. Sandvik assigns its own part numbers to Denison-built pumps used across its rig lineup, and those numbers don’t map one-to-one with a single Denison model code. Here’s the practical breakdown.

002764-013

Commonly listed as a circuit pump (“pompe des circuits” in Sandvik’s French-language catalogs) with a displacement around 7.25 cubic inches, this number shows up frequently in parts catalogs for Sandvik’s larger rotary rigs. It’s often bundled in listings alongside 019145-005 and paired with a matching motor and gearbox assembly for D75KS-class machines.

002764-011

Closely related to 002764-013 in application, this part number appears in the same drive-assembly parts groupings for Sandvik D75KS rigs, frequently alongside final drive and rig winch gearbox components. If your parts manual lists 002764-011 for your rig’s serial range, treat it as application-specific — don’t assume it’s interchangeable with 002764-013 without confirming against your rig’s parts book.

002764-029

This number cross-references to the Denison Gold Cup P7DS3R1A9A2B00 configuration in several supplier catalogs, and also appears associated with Denison Ident No. 023-06794-0 for certain builds. It’s tied to the same D75KS/D50KS platform family but represents a distinct build configuration from -011 and -013.

Common Failure Points on the P7 Series

Understanding how these pumps fail tells you what to inspect before you commit to a full replacement.

Barrel and Cradle Wear

The barrel-bearing design that makes the P7 durable under load is also its most expensive wear item. Once clearances open up beyond OEM rework limits, internal leakage climbs and the pump loses volumetric efficiency — you’ll notice it first as sluggish rotation or reduced drill feed force under load, long before the pump fails outright.

Control Valve and Servo Wear

Standard P7 units ship with rotary servo or compensator override controls. Debris in the hydraulic system is a frequent cause of erratic displacement control, since these servo mechanisms operate on tight tolerances and are unforgiving of contaminated fluid.

Shaft Seal and Case Drain Issues

A rising case drain flow rate is one of the earliest, cheapest-to-catch warning signs of internal wear. Rig operators who track case drain flow as part of routine maintenance tend to catch pump degradation weeks before it turns into a stranded rig.

Contamination-Driven Failure

Denison’s own service literature is blunt about this: fluid must be filtered continuously during operation, and component failure is almost always the effect of a system-level contamination or circuit problem, not the root cause. Replacing a failed pump without addressing what killed it just buys you a second failure on a fresh unit.

(Reference brand sites: www.komatsu.com, www.sandvik.com, www.volvoce.com, www.deere.com)

Engineers and procurement specialists can visit www.baolilai-pump.com for model comparisons, installation solutions, and compatibility guidance. To download detailed technical PDFs—including pressure curves, displacement values, and mounting dimensions—use www.baolilai-pump.com/contact_us/.

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FAQ

Q1: Are 002764-011, 002764-013, and 002764-029 all the same pump?
No. They’re related Denison Gold Cup P7-family pumps used across the same general Sandvik rig platforms, but they represent different build configurations and are not automatically interchangeable. Always confirm the correct number against your rig’s serial-specific parts manual.

Q2: Where do I find the correct part number for my specific rig?
Match your rig’s serial number against Sandvik’s official parts manual. Don’t rely solely on the casting number stamped on an old pump, since aftermarket catalogs frequently cross-reference the same casting under multiple part numbers.

Q3: Is the pump backed by a warranty?
All units include a full one-year warranty.

Q4: How can I access technical documentation?
PDF specifications are available at www.baolilai-pump.com/contact_us/