Danfoss MPV046 axial piston hydraulic pump 019146-001 for the Sandvik drilling rig

The MPV046 is part of the Sauer-Danfoss Series 40 pump and motor family, built around the M46 frame size. It’s a variable displacement axial piston pump with a swashplate design, rated for medium-power hydrostatic transmissions. Depending on the source, it’s cited with a nominal displacement around 45.9 cm³ per revolution, and Series 40 units in general are designed for continuous operation at pressures up to roughly 345 bar (5,000 psi).

019146-001 is the Sandvik-assigned part number for this pump as fitted on specific rig models — most commonly seen across Sandvik’s Leopard, Ranger, and DX/DI series crawler drills, where the OEM sources the base Sauer Danfoss MPV046 casting and configures it (control type, shaft, port layout, auxiliary pad) to match that rig’s hydraulic architecture. Because Sauer Danfoss builds the Series 40 in dozens of configuration codes (control valve type, rotation direction, displacement limiter, auxiliary pump combos), the Sandvik part number is really shorthand for “the exact build spec this rig needs” — which is why cross-referencing by part number, rather than just “MPV046,” matters when you’re sourcing a replacement.

How the MPV046 Works in a Sandvik Hydrostatic Circuit

The Closed-Loop Propel Circuit

On most Sandvik crawler rigs, the MPV046 (or its tandem sibling, the MPT046) feeds a closed-circuit hydrostatic transmission: oil flows from the pump to the travel motors and back to the pump’s inlet, rather than returning to a tank after every pass. This is what allows smooth, reversible tramming and precise speed control.

Neutral position: swashplate is centered, no net flow, rig stands still even with the engine running.

Forward/reverse: swashplate tilts in either direction, redirecting flow and reversing motor rotation without any physical gear shift.

Charge pump: a small auxiliary gear pump (often built into the same housing) keeps the closed loop topped up and replaces internal leakage, which is critical for preventing cavitation.

Feeding Auxiliary Functions

Beyond propel, the same pump assembly (or a tandem-mounted second section) commonly supplies auxiliary circuits — steering, fan drive, or rotation — depending on how Sandvik configured that particular rig model. This is why a single pump failure can look like several unrelated problems at once: a drop in tramming power and sluggish steering response, for example, can both trace back to a worn MPV046.

Common Failure Modes and Warning Signs

1. Loss of Propel Power or Speed

Worn piston shoes, scored valve plates, or a degraded cylinder block reduce volumetric efficiency, so the rig trams slower and loses power on grades even at full throttle.

2. Overheating Hydraulic Oil

Internal leakage converts hydraulic energy into heat instead of useful work. If oil temperatures climb faster than usual under normal load, it’s often the first measurable symptom — well before a full failure.

3. Unusual Noise or Cavitation

A whining or knocking sound from the pump housing, especially at low charge pressure, often points to charge pump wear, aerated oil, or a failing bearing in the rotating group.

4. Erratic or Sluggish Swashplate Response

If the servo or control piston that moves the swashplate is sticking, worn, or contaminated, the operator will feel delayed or jerky speed changes — sometimes mistaken for an electronic control fault on rigs with electro-hydraulic proportional controls.

5. External Leakage at Shaft Seal or Case

A worn shaft seal or case seal will show up as oil accumulation around the pump mounting. On its own it’s usually a seal-kit fix; combined with the symptoms above, it may indicate the shaft bearing is also worn.

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FAQ

Q1: Is the MPV046 used only on Sandvik rigs?
No. The base Sauer Danfoss MPV046 is used across many mobile and industrial applications — excavators, cranes, hedge cutters, and other hydrostatic-drive equipment. Sandvik’s 019146-001 is simply their part number for the build configuration used on specific drilling rig models.
Q2: How long does a properly maintained MPV046 typically last on a drilling rig?
Service life depends heavily on duty cycle, fluid cleanliness, and operating pressure, but Series 40 pumps are designed for demanding mobile hydraulic applications and commonly run for several thousand hours before requiring an overhaul when fluid contamination and charge pressure are properly maintained.
Q3: How to purchase an MPV046 hydraulic pump
You can visit https://www.baolilai-pump.com/contact_us/ and provide us with the specific model number. We will contact you promptly and provide you with a quote.
Q4: Is there after-sales service?
We offer a one-year warranty.