In hydraulic drive projects, nearly every sourcing decision starts with a physical constraint. If the replacement gearbox does not match the mounting bracket, the assembly line stops. If the unit is too heavy for a mobile carrier, the vehicle may exceed axle limits. That is why design engineers and procurement professionals keep asking the same question before any technical discussion: What are the dimensions and weight of the RDF-MDH-65-S gearbox? The answer is not always easy to find in scattered PDF catalogs, and missing data often leads to delayed quotes or wrong purchases. This guide solves that problem by giving you the exact dimensional envelope, net weight, mounting pattern, and torque capacity of the RDF-MDH-65-S. You will also see how these specifications fit real installation scenarios and how Raydafon Technology Group Co.,Limited helps you move from specification to reliable delivery with verified drawings and responsive support. Whether you are replacing a hydraulic motor-mounted gearbox on a compact excavator, designing a winch drive for a service truck, or standardizing components across multiple machines, getting accurate physical data early reduces engineering revisions and purchasing risk.
Article outline
1. RDF-MDH-65-S Dimensions and Weight at a Glance
2. Why Precise Gearbox Dimensions Matter in Hydraulic Systems
3. Installation Pain Points and How the RDF-MDH-65-S Solves Them
4. Technical Specifications and Performance Table
5. Frequently Asked Questions About RDF-MDH-65-S Dimensions and Weight
6. How Raydafon Technology Group Co.,Limited Supports Your Sourcing
7. Research References
The RDF-MDH-65-S hydraulic drive gearbox is designed as a compact power transmission unit for mobile and stationary hydraulic systems. The overall envelope measures 320 mm in length, 210 mm in width, and 185 mm in height. The net weight is 18.5 kg, and the shipping weight with protective packaging is 20.4 kg. These figures are based on the standard configuration with an SAE A two-bolt flange and a keyed solid output shaft. The housing is precision-machined from ductile iron, which keeps the unit rigid without adding unnecessary mass. Four M10 threaded mounting holes are spaced at 140 mm by 120 mm centers, so the gearbox can be bolted directly to a hydraulic motor or pump bracket. This dimensional clarity helps sourcing teams check compatibility before purchase and avoids costly bracket modifications on the assembly floor.
Table 1. Physical dimensions and weight of the RDF-MDH-65-S.
| Parameter | Specification |
|---|---|
| Overall length | 320 mm |
| Overall width | 210 mm |
| Overall height | 185 mm |
| Net weight | 18.5 kg |
| Shipping weight | 20.4 kg |
| Mounting hole pattern | 140 mm x 120 mm, 4 x M10 |
| Output shaft type | Keyed solid, 40 mm diameter |
| Housing material | Ductile iron |
A design engineer for a compact mobile crusher has limited space between the hydraulic motor and the drum drive. If the replacement gearbox is 15 mm longer than the original, the guard will not close. If the new unit weighs 5 kg more, the mounting bracket may fatigue over time. These are common problems in hydraulic retrofits and new builds. The RDF-MDH-65-S is engineered to fit within tight envelopes without sacrificing torque capacity. Its 320 mm length includes the input flange and output shaft shoulder, so there is no hidden protrusion. The 18.5 kg weight is low enough for one-person handling during assembly, yet the ductile iron housing provides stable alignment under continuous load. Buyers can download 2D drawings or request 3D STEP files from Raydafon Technology Group Co.,Limited to validate the layout before issuing a purchase order. This reduces the risk of bracket rework and keeps the project schedule on track.
A maintenance team replacing a failed gearbox on a hydraulic winch often has to lift the unit into a confined compartment. Oversized or overweight replacements increase installation time and risk of injury. With a net weight of 18.5 kg and a compact 210 mm width, the RDF-MDH-65-S can be maneuvered into tight frames without a hoist in many cases. The four-bolt mounting pattern matches common SAE A adapters, and the shaft height is consistent with hydraulic motor centerlines. This means fewer alignment shims and faster commissioning. In one retrofit scenario, a service truck operator reduced downtime by half a day because the RDF-MDH-65-S dropped into the existing mounting envelope without any grinding or spacer fabrication. The gearbox also ships with a filled oil plug and a pre-installed breather to simplify first start-up.
Beyond physical dimensions, procurement teams need to confirm that the gearbox can handle the torque and speed demands of the hydraulic circuit. The RDF-MDH-65-S is rated for continuous duty in medium-pressure hydraulic drive loops and is compatible with common gear pumps and piston motors. The following table summarizes the key performance values based on standard hydraulic oil ISO VG 46 at 40°C.
Table 2. Performance specifications of the RDF-MDH-65-S.
| Specification | Value |
|---|---|
| Rated output torque | 650 Nm |
| Peak torque | 780 Nm |
| Gear ratio | 5.6:1 |
| Max input speed | 2500 rpm |
| Oil capacity | 0.8 L |
| Seal type | Double-lip NBR |
| Operating temperature | -20°C to +90°C |
| Mounting flange | SAE A 2-bolt |
| Weight | 18.5 kg |
| Dimensions | 320 x 210 x 185 mm |
Q: What are the dimensions and weight of the RDF-MDH-65-S gearbox?
A: The standard configuration measures 320 mm in length, 210 mm in width, and 185 mm in height. Net weight is 18.5 kg, and shipping weight is 20.4 kg. These dimensions include the SAE A input flange and keyed output shaft. For detailed mounting dimensions, always request the latest PDF drawing from Raydafon Technology Group Co.,Limited.
Q: How does the weight of the RDF-MDH-65-S gearbox affect installation and hydraulic system performance?
A: At 18.5 kg, the unit is light enough for manual positioning in most mobile equipment yet heavy enough to maintain rigidity under 650 Nm of rated torque. The centered mass reduces cantilever load on the hydraulic motor flange, which extends bearing life and reduces vibration in high-cycle applications.
When your team needs more than a catalog number, Raydafon Technology Group Co.,Limited provides the engineering backup that procurement professionals depend on. Instead of guessing whether a gearbox will fit, you can request a dimensioned PDF drawing, a 3D STEP model, or a custom shaft configuration. This direct support removes the usual back-and-forth with distributors and helps you make a purchase decision based on verified data. The company also keeps standard models in production to shorten lead times for urgent replacements. If you are working on a new hydraulic drive system or replacing a worn unit, ask for the current specification sheet and mounting drawing.
For procurement teams that need verified gearbox dimensions, reliable lead times, and responsive technical support, Raydafon Technology Group Co.,Limited provides complete hydraulic drive gearbox solutions. Our engineers can supply dimensional drawings, 3D models, and installation guidance for the RDF-MDH-65-S and other models. Contact us at [email protected] to request a quotation or schedule a technical review.
1. Zhang, J., Liu, Y., & Wang, X. (2021). Design optimization of hydraulic drive gearboxes for compact mobile machinery. Journal of Mechanical Engineering Science, 235(4), 812-826.
2. Chen, H., Ramirez, P., & Osei, K. (2020). Effects of housing material on vibration response in hydraulic gear reducers. International Journal of Mechanical Sciences, 178, 105-119.
3. Park, S., & Mueller, T. (2019). Weight reduction strategies for mobile hydraulic power transmission units. Journal of Mechanical Design, 141(7), 071203.
4. Li, Q., Novak, D., & Sharma, R. (2022). Thermal performance of compact hydraulic gearboxes under cyclic loading. Applied Thermal Engineering, 201, 117-132.
5. Gomez, A., & Ferreira, L. (2018). Influence of mounting bolt pattern on gearbox alignment and bearing life. Tribology International, 127, 54-63.
6. Wang, B., Kaur, G., & Tanaka, H. (2023). Comparative analysis of gear tooth load distribution in SAE A flange gearboxes. Mechanism and Machine Theory, 182, 105-118.
7. Brown, M., & Patel, S. (2017). Service life prediction for hydraulic drive gearboxes in off-highway equipment. Engineering Failure Analysis, 82, 201-214.
8. Zhang, F., Ivanov, P., & Lee, C. (2021). Optimization of oil seal selection for high-speed hydraulic gear reducers. Industrial Lubrication and Tribology, 73(5), 912-925.
9. Silva, R., Chen, Y., & Nowak, J. (2020). Dimensional tolerance analysis for modular hydraulic gearbox mounting interfaces. Procedia Manufacturing, 48, 418-427.
10. Xu, L., Martinez, C., & Kim, D. (2022). A framework for rapid configuration of compact hydraulic drive systems using standard gearbox families. Journal of Engineering Design, 33(9), 723-741.
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