ML-BK100 Seal Kit for Mighty Lift ML55
SKU: ML BK100
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Product Description
The ML-BK100 seal kit is a hydraulic seal replacement pack for the Mighty Lift ML55 manual pallet jack (5,500 lb capacity model). The kit is an aftermarket equivalent to the original Mighty Lift seal kit, made to OEM size and material specifications for a proper fit. By installing the ML-BK100 seals in your ML55’s pump, you can fix issues like oil leaks or forks slowly lowering, restoring the jack’s lifting performance without replacing the entire pump assembly.
This kit includes:
Wiper - (ML B145)
O-Ring - (ML B144)
O-Ring - (ML B142)
U-Cup - (ML B141)
Wiper - (ML B150)
U-Cup - (ML B151)
Copper - (ML B126)
Copper Washer - (ML B120)
O-Ring - (ML B130)
O-Ring - (ML B132)
Cross References
Part numbers may also reference this seal kit:
Product Specifications
Features of this Product
Kit includes all seals, O-rings, wipers, and washers to rebuild the ML55 hydraulic unit.
Made from oil-resistant NBR rubber, polyurethane, and copper to meet OEM specs.
Fixes leaks, poor lifting, and drifting by restoring full hydraulic pressure.
Precision-fit for ML55 and ML55-2 models; no trimming or universal parts.
Cost-effective alternative to replacing the hydraulic pump.
Packaged for easy seal identification and organized installation.
Installs with basic hand tools; no special equipment required.
Warranty Information
Our 1-year limited warranty covers the ML-BK100 seal kit against any defects in manufacturing. If a seal in the kit is found to be improperly made or damaged before installation, we will replace the kit free of charge.
Note that the warranty does not cover failures due to improper installation or damage to the seals during installation (for example, cuts due to tools).
Our Return & Refund Policy
You may return unused seal kits within 30 days in original condition and packaging. A 20% restocking fee applies to non-defective returns. Wrong or incomplete kits are corrected at no charge. Once a seal is installed or used, the kit is non-returnable. See our Refund Policy for details.
Not Sure If This Seal Kit Fits Your Equipment?
Reach out to us at 832-239-5393 or 1-800-210-8170, or email info@palletjackson.com. Our team can verify whether this seal kit is correct for your pallet jack’s make and model. We’re available Monday–Friday, 9 am–6 pm EST. Using the correct kit is crucial, and we’re happy to help confirm it.
Frequently Asked Questions
Q: Is this kit an OEM Mighty Lift product or aftermarket?
A: The ML-BK100 is an aftermarket replacement kit, not made by Mighty Lift. It’s manufactured to OEM specifications for the ML55 and performs the same as factory seals. Customers report no difference in fit or function. This kit comes with a warranty for added peace of mind.
Q: What material are the seals made of?
A: The seals are made from durable hydraulic-grade materials. O-rings are nitrile rubber (NBR) for oil resistance. Main pressure seals are polyurethane or high-durometer NBR for wear resistance. Copper washers are included for sealing screw plugs. These materials meet or exceed the jack’s temperature and pressure requirements for long service life.
Q: Will replacing the seals fix a pallet jack that won’t lift anymore?
A: Yes—if worn seals are the cause. Installing new seals restores pressure, allowing the jack to lift and hold loads. If the problem is a broken linkage, low oil, or a cracked housing, those must be addressed separately. For jacks with a gradual loss of lift or visible leaks, resealing usually restores full performance.
Q: How often should pallet jack seals be replaced?
A: Pallet jack seals do not have a fixed replacement schedule; instead, they should be replaced as needed, when they show signs of leaks or loss of lifting pressure.
Q: What causes the seals to wear out in the first place?
A: Seals wear from friction during pumping cycles, contamination in the oil, and exposure to extreme temperatures. Dirt or particles in hydraulic fluid can score seals or cylinders. Over time, rubber hardens and loses elasticity, causing cracks and leaks. Overloading the jack also stresses seals.
Q: When would I choose to rethed wit of the sealh a seal kit versus replace the entire pump?
A: Use a seal kit if the pump’s cylinder, piston, and valves are in good condition. It’s cost-effective and fixes most issues, though it requires more labor. If the pump has cracks, bent rods, or severe damage—or you need a quick turnaround—replacing the full hydraulic unit is better. For most leaks or loss of pressure, resealing is the best first option.
OR if the cost of repairs approaches or exceeds 50% of a new pump's price, as this indicates the pump is nearing the end of its lifespan and a new pump offers better value and reliability.
Frequently Bought Together
Check out our Mighty Lift ML55 parts section for other replacement parts.
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