158-3698-001 Char-Lynn T Series LSHT Orbit Motor

Product Overview

The 158-3698-001, 158-3097-001, 158-4088-00, 101-2577-009 and 101-1027-009 belong to the Eaton Char-Lynn (now Danfoss) T Series or related 101/158 Series low-speed high-torque (LSHT) orbital hydraulic motors. Featuring a precision Geroler gear set with disc-valve architecture, these motors are engineered for medium-duty applications requiring high starting torque and smooth low-speed operation. They offer a compact design, high volumetric efficiency and reliable shaft seals. Fully interchangeable with original Char-Lynn / Eaton units, they are validated under simulated operating conditions for reliable performance in agricultural, construction and industrial hydraulic systems.

Technical Specifications 

• Models: 158-3698-001 / 158-3097-001 / 101-2577-009 / 101-1027-009 (Char-Lynn / Eaton T Series and related)
• 158-3698-001 Geometric Displacement: 65 cm³/rev (4.0 in³/rev)
• Mounting: 2-bolt SAE B flange (101.6 mm pilot diameter)
• Output Shaft Example: 25.4 mm straight with woodruff key
• Ports: .875-14 UNF-2B SAE O-ring
• Case Drain: .4375-20 UNF-2B SAE O-ring
• Control Type: Disc-valve-driven Geroler orbital motor
• Seals: Standard seals
• Approximate Weight: 8–12 kg (configuration-dependent)

Key Technical Advantages

1. Precision Geroler gear set delivers high volumetric efficiency, smooth low-speed operation and high starting torque for frequent start-stop applications.
2. Compact design with multiple flange, shaft and port options supports full drop-in interchangeability.
3. Reliable shaft seal design tolerates moderate return pressure, simplifying system plumbing and extending seal life.
4. Precision machining and quality materials enhance overall durability for medium-duty continuous or intermittent service.
5. 100% simulated operating condition testing validates performance consistency under real pressure, flow and load conditions.

Application Areas

Agricultural machinery, construction vehicles, material handling equipment, winches and hoists, augers, light construction machinery, and other mobile or stationary hydraulic systems requiring high torque at low to medium speeds.

Expert Maintenance Tips

Ensure precise flange alignment and control side loads during installation. Use anti-wear hydraulic oil with operating viscosity of 20–43 cSt and maintain appropriate temperature. Fully bleed the system and run at light load for initial break-in. Regularly inspect the shaft seal and fluid cleanliness (10–25 μm filtration recommended). Limit intermittent pressure operation to short durations. In case of unusual noise or torque loss, first check system contamination and fluid condition. Use genuine Char-Lynn / Eaton seal kits for service.