Product Overview
The M5BF Series hydraulic motor is Parker Denison’s classic high-performance fixed-displacement vane motor, specifically optimized for fan drive applications. The series encompasses 6 displacement sizes — M5BF 012, M5BF 018, M5BF 023, M5BF 028, M5BF 036, and M5BF 045 — with displacements ranging from 12 to 45 cm³/rev. The M5BF Series features a patented 2-vane cartridge design, achieving extremely low noise levels at any speed. The series utilizes external drainage and is equipped with a heavy-duty double-row angular contact ball bearing, allowing direct mounting of a fan on the motor shaft without additional external bearing support.
The M5BF 045 WN04 B1M 00000 (OEM part number 024-94700-0) is a large-displacement model in the M5BF Series, with a geometric displacement of 45 cm³/rev, maximum continuous pressure of 200 bar (M5B Series 045 specification), maximum intermittent pressure of 280 bar, rated speed of 3000 rpm / maximum continuous speed of 2500 rpm, SAE 3/4″ 3000 main ports (metric thread), M18×1.5 case drain port, ISO G32N cylindrical keyed shaft, and special 135mm diameter 2-bolt flange mounting. The M5BF-028-2N02-B1M3 is the 28.0 cm³/rev displacement model, with maximum continuous pressure of 290 bar, maximum intermittent pressure of 320 bar, and maximum speed of 4000 rpm. The M5BF 023 WN04 B1M 00000 (OEM part number 054-35493-0) is the 23.0 cm³/rev displacement model, with maximum continuous pressure of 290 bar, maximum intermittent pressure of 320 bar, and maximum speed of 4000 rpm.
The M5BF Series motors feature integrated valve assemblies that transform the motor into a complete hydraulic cooling unit. Parker recommends an excluder shaft seal on fan motors to protect the shaft seal from contamination.
This product is a drop-in interchange replacement for genuine Parker Denison M5BF Series hydraulic motors, covering M5BF 045 WN04 B1M 00000 (024-94700-0), M5BF-028-2N02-B1M3 (054-39761-0), M5BF 023 WN04 B1M 00000 (054-35493-0), M5BF 018 WN04 B1M 00000 (024-94683-0), and other mainstream models. Mounting flange, shaft extension, port configurations, and drain port location are dimensionally identical to OEM specifications, enabling direct replacement without hydraulic circuit or mounting modification. Every motor is subjected to 100% simulated actual-load testing before shipment, ensuring volumetric efficiency, output torque, and sealing performance meet OEM technical standards.
OEM Part Number Coverage:
M5BF 045: 024-94700-0 (WN04 B1M 00000), 054-45849-5
M5BF 028: 054-39761-0 (2N02 B1M3)
M5BF 023: 054-35493-0 (WN04 B1M 00000), 054-34655-003
M5BF 018: 024-94683-0 (WN04 B1M 00000)
M5BF 012: 024-94682-0 (2N00 B102)
M5BF 036: 054-34691-002
Full M5BF Series Coverage: M5BF 012/018/023/028/036/045
Technical Specifications
M5BF 045 WN04 B1M 00000 (024-94700-0) Core Specifications:
Model Code: M5BF 045
OEM Part Number: 024-94700-0
Series: Parker Denison M5BF Series (High Performance Vane Motor, Fan Drive Optimized)
Product Type: Fixed displacement vane motor, externally drained
Geometric displacement: 45 cm³/rev
Max continuous pressure (standard fluid): 200 bar (M5B Series 045 specification)
Max intermittent pressure: 280 bar
Rated speed: 3000 rpm
Max continuous speed: 2500 rpm (45 cc displacement)
Max intermittent speed: 4000 rpm (low loaded conditions)
Theoretical torque: 0.716 Nm/bar
Control type: Fixed displacement, 2-vane cartridge design
Mounting flange: Special diameter 135mm, 2-bolt
Shaft type: ISO G32N cylindrical keyed
Main ports: 3/4″ SAE 3000, metric thread
Drain port: M18×1.5 metric thread
Rotation: Bi-directional
Seal material: Buna-N (NBR) standard
Bearings: Heavy-duty double-row angular contact ball bearings
Weight: Approx. 18.5 kg
Brand: Denison
M5BF-028-2N02-B1M3 (054-39761-0) Core Specifications:
Model Code: M5BF 028
OEM Part Number: 054-39761-0
Series: M5BF Series
Geometric displacement: 28.0 cm³/rev
Max continuous pressure: 290 bar
Max intermittent pressure: 320 bar
Rated speed: 4000 rpm
Rotation: Clockwise (R) or unrestricted
Additional Options: Anti-starve valve
Mounting flange: Special diameter 135mm, 2-bolt
Shaft type: ISO G32N cylindrical keyed
Main ports: 3/4″ SAE 3000, metric thread
Drain port: M18×1.5 metric thread
Seal material: Buna-N (NBR) standard
Brand: Denison
M5BF 023 WN04 B1M 00000 (054-35493-0) Core Specifications:
Model Code: M5BF 023
OEM Part Number: 054-35493-0
Series: M5BF Series
Geometric displacement: 23.0 cm³/rev
Max continuous pressure: 290 bar
Max intermittent pressure: 320 bar
Rated speed: 4000 rpm
Rotation: Bi-directional
Mounting flange: Special diameter 135mm, 2-bolt
Shaft type: ISO G32N cylindrical keyed
Main ports: 3/4″ SAE 3000, metric thread
Drain port: M18×1.5 metric thread
Seal material: Buna-N (NBR) standard
Brand: Denison
M5BF Series Full Range Specifications:
M5BF 012: Displacement 12.0 cm³/rev; Max continuous pressure 290 bar; Max intermittent pressure 320 bar; Rated speed 4000 rpm
M5BF 018: Displacement 18.0 cm³/rev; Max continuous pressure 290 bar; Max intermittent pressure 320 bar; Rated speed 4000 rpm
M5BF 023: Displacement 23.0 cm³/rev; Max continuous pressure 290 bar; Max intermittent pressure 320 bar; Rated speed 4000 rpm
M5BF 028: Displacement 28.0 cm³/rev; Max continuous pressure 290 bar; Max intermittent pressure 320 bar; Rated speed 4000 rpm
M5BF 036: Displacement 36.0 cm³/rev; Max continuous pressure 290 bar; Max intermittent pressure 320 bar; Rated speed 2500–3000 rpm
M5BF 045: Displacement 45.0 cm³/rev; Max continuous pressure 200 bar; Max intermittent pressure 280 bar; Rated speed 3000 rpm
General Configuration Parameters (M5BF Series):
Control type: Fixed displacement, 2-vane cartridge design
Mounting flange: Special diameter 135mm, 2-bolt
Shaft options: ISO G32N cylindrical keyed or taper shaft
Main ports: 3/4″ SAE 3000, metric thread
Drain port: M18×1.5 metric thread or SAE 9/16″
Rotation: Bi-directional, clockwise (R), counter-clockwise (L) available
Seal material: Buna-N (NBR) standard, Viton optional
Bearings: Heavy-duty double-row angular contact ball bearings, direct fan mounting capable
Operating fluid: Mineral-based hydraulic oil
Operating temperature range: -30°C to +90°C
Seal kit part number: 151-1286 (general)
Key Technical Advantages
1. Patented 2-Vane Cartridge Design with Ultra-Low Noise
The M5BF Series employs a patented 2-vane cartridge design, optimizing vane count and cam ring profile to achieve extremely low operating noise at any speed. Combined with low internal dead volume, the design delivers a typical torque ripple of only ±1.5% across the full speed range, significantly outperforming competitive designs — particularly suitable for noise-sensitive construction machinery fan drive applications.
2. Integrated Valve Assembly — Complete Hydraulic Cooling Unit
The M5BF Series motors feature integrated valve assemblies including anti-cavitation check valves, anti-starve valves, and reversing valves, transforming the motor into a complete hydraulic cooling unit. This design saves external piping and valve components, reduces installation costs, and improves system reliability by reducing leak points. The cross-port check valve in uni-directional models enables smooth dynamic braking without risk of motor cavitation.
3. Heavy-Duty Double-Row Angular Contact Ball Bearings with Direct Fan Mounting
The M5BF Series features heavy-duty double-row angular contact ball bearings at the output end, capable of withstanding the axial and radial loads generated by the fan. This allows the fan blade to be mounted directly on the motor’s keyed or taper shaft, eliminating the need for additional external bearing support. A sealed barrier behind the motor shaft seal protects against external debris ingress. Parker recommends an excluder shaft seal on fan motors to further protect the shaft seal from contamination and extend seal service life.
4. High Starting Torque with Wide Speed Range Performance
The M5BF Series vane motors deliver exceptionally high starting torque efficiency. Light springs urge the vanes radially against the cam contour, assuring a seal at zero speed so the motor can develop starting torque immediately. This characteristic allows the motor to start under high load without pressure overshoots, jerks, or high instantaneous horsepower loads. The M5BF 028/023 models operate at 290 bar continuous pressure and 4000 rpm speed, while the M5BF 045 model operates at 200 bar continuous pressure and 3000 rpm speed, meeting the combined high-speed and high-pressure demands of construction machinery fan drives.
Application Areas
Construction Machinery Fan Drive (Core Application): Excavator hydraulic fan drive (ZX470, XCMG485, XCMG490, etc.), loader fan drive, crane hydraulic cooling systems, road roller fan drive
Industrial Equipment: Hydraulic cooling units, compressor drive, generator drive
Other Applications: Mixer drive, shredder drive, hydraulic hybrid systems
Expert Maintenance Tips
Pre-Installation Preparation:
Clean all ports and mounting flanges with lint-free wipes or clean compressed air before installation. Verify O-ring integrity. The M5BF Series uses a special 135mm diameter 2-bolt flange — confirm the flange specification matches the system before installation. Torque mounting bolts in a diagonal sequence over 2–3 passes. After installation, manually rotate the output shaft to confirm free and smooth rotation without binding. Note that M5BF is an externally drained configuration — ensure the drain line is correctly connected.
Drain Port Management:
The M5BF Series is an externally drained motor — the drain port (M18×1.5 or SAE 9/16″) must be connected to a drain line routed separately back to the reservoir with the end submerged below the oil level. Drain line back pressure must not exceed 2 bar; excessive back pressure will damage the shaft seal. If an internally drained model is used, no external drain line is required.
Hydraulic Fluid Management:
Use anti-wear hydraulic oil with ISO VG 46 or ISO VG 68 viscosity grade. The M5BF Series is designed to maintain sustained high-pressure and high-speed performance even under low fluid lubricity conditions, but fluid cleanliness should still be maintained at ISO 18/16/13 or NAS Class 8 minimum. Operating temperature should not exceed 80°C continuous; short-term peak up to 95°C is acceptable. Replace hydraulic fluid after the first 50 operating hours. Internal parts are lubricated by the operating fluid itself; therefore, preventive maintenance is limited to keeping the fluid clean and maintaining an acceptable viscosity range. System filters should be replaced frequently.
Rotation Direction Verification:
The M5BF Series is available in bi-directional, clockwise (R), and counter-clockwise (L) rotation configurations. Verify motor rotation direction matches system requirements before installation. Uni-directional models feature an internal cross-port check valve and must not be operated in reverse. Rotation is viewed from the shaft end: R=CW stands for clockwise, L=CCW for counter-clockwise, N for bi-directional.
Periodic Inspection:
Check volumetric efficiency every 500 operating hours or quarterly. Test method: lock the output shaft at rated pressure and measure leakage flow. If leakage exceeds 10% of rated flow, internal wear has entered an accelerated phase — schedule service or replacement. Also inspect shaft seals for seepage and heavy-duty double-row angular contact ball bearings for abnormal noise or vibration. Check frequently that all fittings and bolts are tight at correct torque.
