Description

Sauer-danfoss TMK, TMKW, TMK FL 2008 Technical Manual – OEM Factory Specs

Hydraulic motor work without factory specs is a gamble—one that costs you time and parts. The Sauer-danfoss TMK, TMKW, TMK FL 2008 Technical Manual is the only documentation that gives you exact OEM numbers for torque, displacement, and pressure ratings. Aftermarket manuals throw generic ranges at you. That gets a motor torn down twice. I’ve seen it. If you’re rebuilding an orbital motor in San Antonio or anywhere else, you want the page that matches the production line spec, not a guess.

Orbital Motor Technical Data

Page 2 and 3 of this 28-page manual lay out the core specs. Displacement runs from 8 cm³ to 800 cm³ per revolution—that’s 0.50 in³ to 48.9 in³. Speed tops 2500 rpm on the small motors and 600 rpm on the largest. Operating torque? 13 Nm to 2700 Nm (115 lbf·in to 24.000 lbf·in peak). Those numbers are factory certified, not third-party approximations. If you need to match a motor to an application, this is the data you trust.

What Torque Values Are Listed in the Manual?

Sauer-Danfoss publishes maximum operating torque, starting torque, and peak torque for each variant. Page 2 shows the range. The manual also includes return pressure specs without a drain line thanks to the high-pressure shaft seal. For a wheel motor job, that matters. You don’t want to underspec a seal because the aftermarket chart said ‘similar to XXX.’ The factory manual tells you exactly what the motor was designed to take.

3 Key Variants: TMK, TMKW, and TMK FL

The manual splits coverage across three model families. TMK is the base orbital motor. TMKW adds wheel motor capability with a recessed mounting flange. TMK FL includes features like corrosion-resistant parts, needle bearings, and integrated holding brakes (positive and negative). Page 3 lists those adaptations. If you’re swapping a TMK FL into a closed-loop system, you need the factory info on drain line requirements and fluid compatibility. The manual covers all that.

Use Factory Documentation – Avoid Aftermarket Guesswork

I’ve watched techs follow an aftermarket ‘equivalent’ manual and bolt a motor together with wrong torque on the commutator plate. That leaks. The OEM manual gives you the exact fastener torque, the correct O-ring type, and the planetary gear clearance. This Sauer-danfoss manual is original print, not a reprint or scan of a scan. The diagrams are crisp, the values are verified. For the price of a single gasket set, you get the whole factory book. That’s worth it.

Planetary Gears and Motor Adaptations

Page 3 introduces the planetary gear program—Sauer-Danfoss complements the motor range with gears adapted to specific displacements. The manual also lists variants like ultra-short motors without bearings, motors with speed sensors or tacho connections, and black paint finish options. If you are building a custom drive system, these adaptation details save you from ordering the wrong subassembly. Compare that to a generic manual that says ‘planetary gear available.’ The factory manual tells you which gears mate to which motor shaft.

For a high-torque low-speed application, orbital motors behave differently from a gear-type unit—think of the low-gear range in a Manual Transmission. The torque multiplication is similar, but hydraulic control adds complexity. Having the factory technical information stops you from overspeeding a motor or undersizing the coupling.

This manual is not a service manual for disassembly. It’s a technical information document—28 pages of performance curves, installation dimensions, fluid recommendations, and torque limits. Use it when specifying a replacement motor, building a hydraulic circuit, or verifying a failed unit’s capability. I keep a copy in my toolbox next to the torque wrench.

Frequently Asked Questions

Does this manual cover the TMK FL model?

Yes. The manual explicitly lists TMK FL variants with corrosion-resistant parts and integrated brakes.

What displacement range is included?

From 8 cm³ to 800 cm³ per revolution. Page 2 specifies the exact range for each model. The manual also includes cubic-inch equivalents.

Are torque values given in both Nm and lbf·in?

Yes. The manual provides peak and operating torque in both metric and imperial units. For example, peak torque is listed as 2700 Nm [24.000 lbf·in].

How many pages is this manual?

28 pages.

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Stop burning billable hours on aftermarket approximations. Get the factory data that every Sauer-Danfoss motor was built to. Access the Factory Manual now.