Danfoss 90M axial piston hydraulic motor 019147-002 for the Sandvik Construction Equipment

The 90M motor line is Danfoss’s workhorse family of fixed-displacement axial piston motors, originally developed under the Sauer-Danfoss brand before Danfoss fully absorbed the Sauer-Sundstrand hydraulics business. Series 90 motors feature a parallel axial piston/slipper design and a fixed swashplate, with maximum displacements ranging from 55 cm³ to 130 cm³ and maximum working pressures of 450 bar, and they are used in a variety of closed-circuit applications. These motors have built a strong reputation over the years, offering high flexibility and strong power performance with a consistent look and feel across the full size range.

Part number 019147-002 is documented in the aftermarket supply chain as a Sandvik-branded cross-reference for the Sauer-Danfoss 90M series, commonly associated with the 90M055 / 90M075 / 90M100 / 90M130 displacement family and cross-referenced against D50KS / D75KS-style designations used on Sandvik drill rigs and construction machines. Suppliers list it alongside sibling numbers such as 019147-013, all pointing back to the same Series 90 platform.

How the 90M Axial Piston Motor Works

Understanding the internal architecture makes it much easier to diagnose problems later, so it’s worth a quick walkthrough.

The Core Mechanism

An axial piston motor converts hydraulic flow into rotational shaft torque using a cylinder block full of pistons arranged parallel to the drive shaft (hence “axial”). Pressurized oil pushes each piston outward against a fixed swashplate. Because the swashplate is angled, the piston’s reaction force has a rotational component, which turns the cylinder block and the output shaft.

Swashplate: Fixed angle (non-tilting) on the 90M — this is what makes it a fixed-displacement motor rather than a variable one.

Piston/slipper assembly: Slippers ride on the swashplate face, distributing load and reducing wear.

Valve plate: Times the high-pressure and low-pressure ports to each piston bore as the block rotates.

Case drain: Manages internal leakage and keeps the case pressure within safe limits.

Bidirectional, Closed-Circuit Design

Danfoss Series 90 hydrostatic motors are intended for closed-circuit applications and can transfer and control hydraulic power in a system. Because the motor is bidirectional, reversing the pump’s flow direction reverses the motor — this is exactly how a Sandvik drill rig or crawler machine switches between forward and reverse travel, or how a winch drum changes direction, without needing a separate reversing valve bank.

Loop Flushing

On higher-duty-cycle machines — think Sandvik surface drill rigs running for hours at a stretch — heat buildup in a closed hydraulic loop is a real concern. The optional loop flushing feature bleeds a small, controlled volume of hot oil out of the loop and replaces it with cooler, filtered oil from the charge circuit. If your machine’s duty cycle involves long continuous runs, confirm whether your 019147-002 equivalent includes this option — omitting it on a heavy-duty application is a common cause of premature motor wear.

Typical Applications on Sandvik Equipment

Series 90 motors are the go-to choice for hydrostatic transmission (HST) systems on mobile and stationary equipment. This motor family is used in HST drivetrains on machines such as bulldozers, excavators, pipelayers, skid steer loaders, snowcats, as well as traction winch drives and drilling rigs.

On Sandvik equipment specifically, expect to find the 019147-002 motor (or its Series 90 equivalents) doing work in:

Track Drive / Travel Motors

Powering the final drive on tracked Sandvik drill rigs and construction carriers, where torque density and bidirectional control are essential for maneuvering on uneven ground.

Rotary Head / Winch Drive Circuits

On drilling equipment, a fixed-displacement motor of this type is often paired with the rig’s rotary head drive or auxiliary winch, where consistent torque output matters more than variable speed control.

Auxiliary Hydraulic Circuits

Compressor drives, conveyor drives, or other continuous-duty rotating loads on drill rigs and crushing/screening equipment.

FAQ

Q1: Is 019147-002 a Danfoss part number or a Sandvik part number?
It’s a Sandvik OEM part number. It cross-references to a Danfoss Series 90 (90M) fixed-displacement axial piston motor built to Sandvik’s specific order code for that machine.
Q2: How long should this motor last under normal use?
With clean fluid, correct pressure settings, and routine case drain monitoring, Series 90 motors are known for strong service life across construction and drilling duty cycles. Actual life depends heavily on contamination control and duty cycle severity.
Q3: How to purchase a 90M hydraulic motor
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.