Product Description
AT149945 John Deere Hydraulic Pump
New Aftermarket Replacement Hydraulic Pump
The AT149945 hydraulic pump is a replacement hydraulic pump designed for John Deere heavy equipment hydraulic system applications. Hydraulic pumps used in construction and loader equipment are responsible for maintaining hydraulic oil flow and operating pressure throughout the machine during lifting, steering, bucket movement, and auxiliary hydraulic operation.
This replacement hydraulic pump is commonly associated with John Deere 644G wheel loader applications and related hydraulic systems. The unit is designed to meet or exceed OEM specifications and help restore dependable hydraulic performance in demanding construction and material handling environments.
Quick Specifications
Part Number: AT149945
Equipment: John Deere 644G
Condition: New Aftermarket Replacement
Approximate Weight: 72 Pounds
Machine & Hydraulic System Information
John Deere 644G wheel loaders are commonly used in construction, aggregate handling, material loading, industrial yards, site preparation, and heavy-duty earthmoving operations. Hydraulic systems on these machines are subjected to continuous pressure loads, vibration, heat, contamination exposure, and demanding operating conditions throughout the workday.
Hydraulic pumps used in wheel loader applications commonly support steering systems, lift arms, bucket tilt functions, auxiliary hydraulic circuits, and attachment controls. Maintaining proper hydraulic pressure and flow is important for efficient machine response and dependable loader performance.
Product Dimensions
| Weight | 72 lb |
| Height | 7.5 in |
| Width | 7.7 in |
| Length | 11.3 in |
Common Hydraulic Pump Failure Symptoms
- Slow loader arm movement
- Weak bucket lift power
- Erratic steering response
- Hydraulic overheating
- Pressure loss during operation
- Noisy hydraulic system operation
Typical Loader Hydraulic Functions
- Lift arm hydraulics
- Bucket tilt circuits
- Steering hydraulics
- Auxiliary hydraulic operation
- Attachment controls
- Material handling functions
Reference Information
The following reference information is associated with this replacement hydraulic pump:
OEM Reference: AT149945
Associated Equipment: John Deere 644G
Application Verification
Hydraulic pump configurations can vary depending on machine serial number range, hydraulic system revisions, shaft configuration, mounting dimensions, port orientation, and equipment options. Before ordering, compare the replacement hydraulic pump with the existing hydraulic pump currently installed on the machine.
Reviewing the original OEM part number, machine serial number, and equipment parts catalog can help confirm compatibility for your specific John Deere application.
Additional Product Information
This AT149945 hydraulic pump is a brand new aftermarket replacement unit and is not rebuilt, remanufactured, or previously installed. The pump is intended for hydraulic system repair, wheel loader maintenance, heavy equipment service, and replacement of worn hydraulic components.
The AT149945 John Deere replacement hydraulic pump is available for quick shipment from Ace Motor Parts.
