HL18HD consists of a Hydraulic Pump Mounted on a Cylinder and totally Self Contained Cylinder Tube is Aircraft Quality 6063T832 Hard Coat Anodized Aluminum. The Rod is 5/8" Stainless Steel with an Aluminum Clevis Cylinder Length is 26" on centers Retracted with an 18"Stroke The Extended Length is 44" The 12 Volt DC Motor is SAE J1171Marine 2-Wire Permanent Magnet type The Maximum Hatch weight is 500 Pounds For larger boats with Heavier Hatches up to 1000 Pounds we recommend using 2 Cylinders and 1 Heavy Duty Hydraulic Pump Call the factory for help designing a Hatch Lift System for boats that require a system to handle weights exceeding 500 pounds
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