Rexroth A11VO axial piston pumps for CNH CASE dozer 76040621 72108892 72104853 72115790 72104854 72115801 72108893

The A11VO is a variable displacement axial piston pump built by Bosch Rexroth using a swashplate design for open-circuit hydraulic systems. In plain terms, it's a pump whose internal angle (the "swash angle") can be adjusted on the fly, which changes how much oil it pushes per revolution without needing to change engine speed.

That's a big deal on a dozer. A fixed-displacement gear pump gives you flow proportional only to engine RPM. A variable piston pump like the A11VO lets the machine's hydraulic system deliver exactly the flow and pressure a given task needs — light flow for fine grading, maximum flow for ripping or heavy blade work — while keeping engine load and fuel burn more efficient.

Why CNH Uses the A11VO in Case Dozers

CNH Industrial (the parent of Case Construction Equipment) sources major hydraulic components from established suppliers rather than manufacturing every part in-house, and Bosch Rexroth's A10/A11 pump families are among the most widely deployed variable pumps in mobile construction equipment worldwide. On Case crawler dozers, A11VO-family pumps commonly show up in:

Hydrostatic travel drive circuits on dozer models that use hydrostatic (rather than torque-converter/powershift) transmissions, where precise, variable oil flow to the drive motors is what lets an operator feather speed and direction smoothly.

Implement circuits feeding blade lift, tilt, and angle functions, and on many models the ripper as well.

Combination pump setups, where an A11VO is paired through its through-drive with a second gear or piston pump to run auxiliary circuits like the cooling fan drive or steering assist off the same engine-driven shaft.

The appeal for an OEM like CNH is straightforward: a pump platform with decades of field history, broad control-option flexibility, and parts/service support through a global Bosch Rexroth network — all of which reduces engineering risk on a machine that customers expect to run 8,000+ hours between major overhauls.

Common Symptoms of A11VO Pump Wear on a Case Dozer

Axial piston pumps rarely fail without warning. Watching for these signs early is the difference between a seal kit and a full pump replacement.

Loss of Travel Power or Sluggish Response

If a Case dozer that used to lunge into a cut now creeps, or the hydrostatic drive feels "soft" under load, internal wear in the piston/cylinder block assembly is a prime suspect. As piston shoes and cylinder bores wear, internal leakage increases, and the pump can no longer maintain pressure at a given displacement setting.

Overheating Hydraulic Fluid

A worn A11VO bleeds more oil internally from high pressure back to the case drain, and that lost energy turns into heat. If your hydraulic temperature gauge is running noticeably hotter than it used to under the same working conditions, have the pump's case drain flow checked against Bosch Rexroth's published specification for that pump size.

Whining or Cavitation Noise

A high-pitched whine, particularly at startup or under load, often points to air ingestion, a restricted suction line, or worn pistons no longer sealing properly against the cylinder bore. Cavitation from insufficient suction pressure is one of the fastest ways to destroy an axial piston pump, so this symptom deserves same-day attention, not a "keep an eye on it."

Visible External Leakage

Shaft seal leaks around the drive coupling are common wear items and are usually a straightforward, inexpensive fix if caught early — before contaminated oil or a failed seal lets dirt into the pump housing.

Metal Contamination in Hydraulic Filters

Finding metallic debris in the return filter or on a magnetic drain plug is a red flag for advanced internal wear (piston shoes, swashplate, or valve plate scoring) and usually means a teardown inspection is overdue.

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Q1: Is the Rexroth A11VO the same pump used across all Case dozer models?

A1: No. CNH specifies pump size and control configuration to match each dozer model's hydraulic demands, engine PTO speed, and circuit design. Two Case dozers in the same lineup can use different A11VO frame sizes or entirely different control options. Always verify against the parts manual or pump nameplate rather than assuming interchangeability.

Q2: Does using the wrong hydraulic fluid really affect pump life that much?

A2: Yes. Axial piston pumps depend on a thin, consistent fluid film to separate moving parts running at high pressure. Fluid that's out of the specified viscosity range or contaminated beyond the pump manufacturer's cleanliness class accelerates wear on pistons, the valve plate, and the swashplate far faster than on simpler pump types.

Q3: What is the price and delivery time of the A11VO hydraulic pump for the CNH CASE dozer？

A3: The specific price and delivery time will depend on the equipment model or specific product model you provide.

Q4: How to purchase an A11VO hydraulic pump for the CNH CASE dozer?

A4: You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.