Views: 222 Author: Ella Publish Time: 2025-02-01 Origin: Site
Content Menu
● Step 1: Locate the Identification Tag or Engravings
● Step 2: Decode the Model Number
● Step 3: Identify Key Features
● Step 4: Cross-Reference Specifications
● Step 5: Troubleshoot Missing Tags
● Maintenance Tips for Unknown Motors
>> 1. How do I differentiate Geroler and axial piston motors?
>> 2. What if my motor has a non-standard bolt pattern?
>> 3. Can I use a Char-Lynn motor as a direct replacement?
>> 4. Why does my motor leak at the shaft?
>> 5. Where can I find torque specifications?
Eaton hydraulic motors are workhorses in industries ranging from construction to agriculture, but identifying a specific model can be challenging—especially when tags are missing or worn. This guide provides actionable steps to decode Eaton motor specifications, locate critical identifiers, and troubleshoot common issues.
Most Eaton motors have a metal identification tag or engraved markings on the housing. Common locations include:
- Motor body: Near the shaft or port connections.
- End caps: Check for stamped numbers or labels.
- Flange mounts: Inspect bolt patterns for engraved series codes.
If the tag is missing, measure critical dimensions:
- Bolt patterns (SAE or metric).
- Shaft diameter and type (keyed, splined, or tapered).
- Port sizes and thread type (NPT, UNF, or SAE O-ring).
Eaton model numbers follow a structured format. For example, 101-1755-009 breaks down as:
- 101: Series code (e.g., H, J, or T series).
- 1755: Displacement and design variant.
- 009: Revision or configuration code.
Common series identifiers:
Series | Motor Type | Applications |
---|---|---|
J | Spool Valve Geroler | Agricultural, conveyors |
H | High-Pressure Geroler | Track drives, forestry |
T | Disc Valve Geroler | Wheel motors, excavators |
2000 | Axial Piston | Heavy-duty drilling |
- Geroler/Orbital Motors: Compact, high torque at low speeds. Look for radial piston designs with a spool valve shaft.
- Axial Piston Motors: Recognizable by cylindrical housings and dual swashplates (e.g., Dowmax series).
- Swing Motors: Designed for rotational applications (e.g., JMF series for excavators).
- SAE O-ring ports: Common in high-pressure Geroler motors (e.g., T series).
- NPTF threaded ports: Found in low-pressure spool valve motors.
Use Eaton's technical manuals or online tools to match measurements with specifications:
Example: J Series Spool Valve Motor
Parameter | Value |
---|---|
Displacement | 19.8 cm³/rev |
Max Torque | 333 lb-in |
Port Size | 9/16" SAE O-ring |
Shaft Type | 1" straight keyed |
If no identifiers remain:
1. Measure bolt patterns: Compare to SAE standards (e.g., 4-bolt 82.55mm B.C. for H series).
2. Check shaft specs: Tapered shafts often indicate track drive motors (e.g., HP50 series).
3. Consult repair manuals: Cross-reference parts like seals or bearings with Eaton catalogs.
- Replace seals: Use universal kits for common series (e.g., 109-1115-006 for Geroler motors).
- Pressure test: Verify relief valve settings to avoid mismatched replacements.
Identifying an Eaton hydraulic motor requires methodical inspection of tags, physical measurements, and cross-referencing technical resources. Prioritize verifying displacement, port types, and shaft configurations to ensure compatibility. For motors with missing tags, leverage bolt patterns and seal kits to narrow down possibilities.
Geroler motors have radial pistons and spool valve shafts, while axial piston motors use angled swashplates for higher speed applications.
Measure the pilot diameter and bolt circle, then compare to Eaton's flange charts (e.g., 44.4mm pilot for 4-bolt mounts).
Yes—Char-Lynn is an Eaton subsidiary, and motors like the J-2 series are interchangeable with equivalent Eaton models.
Worn seals or excessive case pressure (above 76 bar) are common causes. Upgrade to high-pressure seals if needed.
Refer to Eaton's E-MOLO-MC001 manual or use the formula:
Torque Nm =(Displacement cm rev ×Pressure ba)/20π
[1] https://info.texasfinaldrive.com/shop-talk-blog/the-eaton-series-of-lsht-hydraulic-motors
[2] https://www.hjhydraulic.com/char_lynn_motor_identification.html
[3] https://nordfluid.it/wp-content/uploads/2021/09/Spool-Valve-Hydraulic-Motors.pdf
[4] https://store.masondynamics.com/Char-Lynn-Eaton-Hydraulic-Motor-101-1755-009/item/101-1755-009
[5] https://videos.eaton.com/detail/videos/aerospace/video/2404968155001/eaton-s-hydraulics-products-for-aerospace?autoStart=true
[6] https://uschydraulics.com/products/danfoss-eaton-char-lynn-158-3991-001-hydraulic-torque-motor-mt0018ba01aa0100070000000aa00a-replaces-old-no-146-2949-002-t-series
[7] https://www.psifluidpower.ca/customer/docs/skudocs/eaton-motor-specifications.pdf
[8] https://www.tractorbynet.com/forums/threads/need-help-identifying-repairing-leaky-eaton-hydraulic-motor-with-missing-id-tag.391025/
[9] https://www.eaton.com/in/en-us/products/motors-generators/high-torque/how-to-select-the-right-motor-for-your-application.html
[10] https://www.eaton.com/us/en-us/products/motors-generators.html
[11] https://www.youtube.com/watch?v=-LapsOknL6s
[12] https://www.eaton.com/gb/en-gb/products/motors-generators/high-speed.html
[13] http://www.chaski.org/homemachinist/viewtopic.php?t=97824
[14] https://www.eaton.com/nz/en-gb/products/motors-generators.html
[15] https://images.eaton.com/ecm/groups/public/@pub/@eaton/@hyd/documents/content/pll_1357.pdf
[16] https://www.eaton.com/br/en-us/products/motors-generators/high-torque.html
[17] https://www.eaton.com/gb/en-gb/products/motors-generators/high-torque.html
[18] http://www.associatedgroups.com/EATON-CAT/motors_disc.htm
[19] https://www.eaton.com/br/en-us/catalog/hydraulic-motors/char-lynn-disc-geroler-motors.html
[20] https://www.youtube.com/watch?v=ZZEaDzx4TBM
[21] https://www.youtube.com/playlist?list=PLzUGDBQJvs1xqXbOjakdcWFTpgIx-2VY4
[22] https://www.hidraoil.com/products/standard/101-2104-009-char-lynn-eaton-hydraulic-orbital-motor-100-cm3-with-cylindrical-shaft-25.4-mm-1-inch-diameter/
[23] https://www.eaton.com/br/en-us/catalog/hydraulic-motors/char-lynn-hp-geroler-motors.html
[24] https://www.youtube.com/watch?v=aS3w5Tr7I88
[25] https://www.hidraoil.com/products/standard/101-1020-009-char-lynn-eaton-hydraulic-orbital-motor-series-h/
[26] https://www.youtube.com/watch?v=l4-Zva4HdNw
[27] https://www.youtube.com/watch?v=DxMCfITXEFI
[28] https://topkitparts.com/eaton-hydraulic-pump-identification-guide/
[29] https://www.berendsen.com.au/wp-content/uploads/2017/08/PB3701_FA3_char-lynn-catalogue-April17.pdf
[30] https://www.panagonsystems.com/the-different-types-of-hydraulic-motors/
[31] https://hydraulicjunkyard.com/products/char-lynn-eaton-hydraulic-motor-158-3878-001
[32] https://videos.eaton.com/detail/video/2404968155001/eaton-s-hydraulics-products-for-aerospace
[33] https://elephant-power1.en.made-in-china.com/product/hFIfXBkGyScd/China-Char-Lynn-112-1131-Eaton-Hydraulic-Motors-Low-Speed-High-Torque.html
[34] https://www.hidraoil.com/products/standard/101-1747-009-char-lynn-eaton-hydraulic-orbital-motor-120-cm3-with-straight-shaft-25-mm-and-2-bolt-flange/