BH0785 Parker Torqmotor BG BH Hydraulic Motor Brake

Product Overview

The Parker Torqmotor™ BG / BH Series fixed-displacement hydraulic motors (models including BH0335, BH0405, BH0475, BH0530, BH0625, BH0785, BH0960, and configured units such as BH0785CS310AAAG and BH0960AS320AAAA) feature an integral spring-applied, hydraulically released wet disc brake on a rugged LSHT orbital motor platform. Designed for medium-duty propel applications requiring reliable parking or holding brake function, these motors deliver precise drop-in interchangeability with original Parker performance. Every unit is 100% tested under simulated operating conditions to ensure high volumetric efficiency, exceptionally smooth low-speed operation, and extended service life. Precision machining, continuous internal spline oil-flow cooling, and robust construction make them the preferred choice for OEM replacement and system upgrades in demanding environments.

Technical Specifications 

• Models: BH0335 / BH0405 / BH0475 / BH0530 / BH0625 / BH0785 / BH0960 (and full codes such as BH0785CS310AAAG, BH0960AS320AAAA; equivalent BG series displacements available)
• Displacement: BH0335 = 337 cm³/rev; BH0405 = 405 cm³/rev; BH0475 = 477 cm³/rev; BH0530 = 528 cm³/rev; BH0625 = 623 cm³/rev; BH0785 = 786 cm³/rev; BH0960 = 959 cm³/rev (series range 141–959 cm³/rev)
• Continuous (rated) differential pressure: approx. 69–207 bar depending on size (higher for smaller displacements; larger sizes such as BH0960 approx. 69–103 bar)
• Peak (intermittent) differential pressure: up to 276 bar / 4000 psid
• Maximum speed: series up to approx. 660 rpm (higher for smaller sizes; BH0960 approx. 118 rpm)
• Maximum flow: continuous 76 L/min, intermittent up to 114 L/min
• Control type: Fixed displacement (quantitative) orbital design with integral spring-applied, hydraulically released wet disc brake (parking/holding)
• Shaft diameter: BG series 1.25 inch nominal; BH series 1.5 inch nominal
• Brake holding torque: BG standard approx. 1350 Nm (12,000 lb-in); BH standard approx. 1800 Nm (16,000 lb-in)
• Maximum side load at key: BG approx. 16,000 N; BH higher approx. 21,306 N
• Weight: approx. 27–35 kg (varies by size and configuration)
• Additional: Continuous torque range up to approx. 773–1044 Nm, intermittent up to approx. 1,268–1,428 Nm; high-pressure shaft seal; brake release port capable of pressures to approx. 207 bar

(Data extracted from official Parker Torqmotor BG/BH Series technical literature and product pages; actual performance depends on exact configuration and operating conditions.)

Key Technical Advantages

1. Precision-machined orbital elements combined with continuous internal spline oil-flow cooling deliver high volumetric efficiency, superior starting torque, and smooth crawl-free ultra-low-speed operation.
2. Spring-applied, hydraulically released wet disc brake provides dependable static holding torque; front-mounted design remains reliable even in the event of system pressure loss, with low full-release pressure.
3. High side-load capacity and robust bearing system support wheel-drive and dynamic loading typical of medium-duty propel applications.
4. High-pressure shaft seal and case-drain-free design simplify plumbing, reduce potential leak points, and extend service life; 100% simulated-condition testing ensures consistent interchangeability and performance.

Application Areas

• Drive wheels and propulsion systems on agricultural and turf equipment
• Construction machinery, material-handling vehicles, and trailers
• Medium-duty wheeled equipment requiring reliable parking/holding brake integration
• Other hydraulic propel applications demanding low-speed high-torque output with integral wet disc braking

Expert Maintenance Tips

Ensure the brake release circuit is correctly connected and that release pressure meets or exceeds the minimum full-release value (approx. 22 bar). Use clean hydraulic oil meeting DIN 51524 with filtration to at least ISO 4406 18/16/13. Avoid prolonged operation beyond intermittent pressure or speed ratings. Periodically inspect brake disc wear and shaft seals; fully bleed the system before start-up. Protect ports and shaft ends during storage and transport to prevent contamination and impact damage. The brake is intended for static parking/holding only and must not be used for dynamic braking.