Product Description
The ML B149 is a precision-engineered compression spring designed for Mighty Lift ML55 manual pallet jack hydraulic pump assemblies. Manufactured from SAE 1070 high-carbon steel with Rockwell C44 minimum hardness, this spring delivers reliable return force in hydraulic lifting cycles. Shot-peened construction provides enhanced fatigue resistance and extended service life. With a rated force of 38 lbs at 1.00 inch compression and closed, ground ends for stable seating, the ML B149 ensures consistent pressure relief and optimal pump performance in demanding warehouse and loading dock environments.
Specifications
Material & Construction
| Steel Grade | SAE 1070 |
| Hardness | Rockwell C44 minimum |
| Finish | Shot peening for enhanced fatigue resistance |
| End Type | Closed and ground ends |
Specifications
| Rated Force | 38 lbs at 1.00 inch compression |
| Free Length | 2.25 inches |
| Outer Diameter | 0.75 inch |
| Wire Diameter | 0.080 inch |
Part Information
| Manufacturer Part Number | ML B149 |
| Compatible Model | Mighty Lift ML55 hydraulic unit |
Frequently Asked Questions
Q: What is the ML B149 spring and what does it do?
A: The ML B149 is a compression spring designed for Mighty Lift ML55 manual pallet jack hydraulic units. It provides return force in the hydraulic pump mechanism and is a critical component for consistent lift cycling and pressure relief within the B-series pump assembly.
Q: What are the spring specifications for the ML B149?
A: The ML B149 has a rated force of 38 pounds at 1.00 inch compression. Free length is 2.25 inches, outer diameter is 0.75 inch, and wire diameter is 0.080 inch. These dimensions ensure proper seating within Mighty Lift hydraulic assemblies and correct load ratings for ML55 pump operation.
Q: What material and hardness does the ML B149 have?
A: The ML B149 is manufactured from SAE 1070 high-carbon steel with Rockwell C hardness of 44 minimum. The spring features shot peening for enhanced fatigue resistance and has closed and ground ends for stable seating. This construction provides reliable performance under repeated compression cycling.
Q: What is the expected service life of the ML B149 spring?
A: Under normal use conditions, the ML B149 may function for the operational life of your Mighty Lift ML55. High-cycle usage, improper load ratings, or contamination of the hydraulic fluid can accelerate spring fatigue and reduce service life. Shot-peened construction improves fatigue resistance compared to standard springs.
Q: What symptoms indicate the ML B149 spring has failed?
A: A weak or failed ML B149 spring may cause slow lift response, inability to maintain pressure, or inconsistent lifting action on your Mighty Lift ML55. Loss of spring force requires replacement of the spring along with associated seals and the pump piston to restore hydraulic system function.