D512394 Lift Gp Secondary Cylinder FFT for Doosan Forklifts

Overview

The D512394 Lift Gp – Secondary Cylinder – FFT is a Doosan replacement secondary lift cylinder group for the mast on selected Doosan forklifts. In a multi-stage mast, the secondary cylinder drives the second lift stage, converting hydraulic pressure into the extra vertical travel needed for higher stacking. When this component wears out through seal wear, rod scoring, or internal leakage, operators usually notice slow or uneven lifting, mast drift under load, or visible hydraulic oil leaks. Fitting a new D512394 cylinder group restores smooth, dependable mast operation and safe, confident load handling.

Compatibility

The D512394 for B13/15/16R5(SB1088) and the other listed applications covers several popular Doosan forklift series:

• B13/15/16R5 series (SB1088)
• B15/18S5 series (SB1086)
• BC15/18S5, BC20SC5 (SB1087)
• BR13/15/18J5 series (SB1116)

Because mast configurations can vary within a series, always verify the part against your truck’s model and serial number before ordering. If you are unsure, send us your forklift’s data plate details and our parts specialists will confirm that D512394 is the correct secondary cylinder group for your machine.

Quality and Reliability

As a Doosan-branded component, the D512394 is produced to the original specifications for the listed models, so its dimensions, mounting points, and hydraulic interfaces match the cylinder group it replaces. A correctly specified secondary lift cylinder maintains consistent lifting speed and load control, reduces strain on the rest of the mast, and cuts downtime caused by hydraulic faults. Ordering the exact Doosan part number is the most dependable way to keep your forklift performing as designed.

Installation and Maintenance Tips

• Have the cylinder replaced by a trained technician, with the truck safely secured and the hydraulic system fully depressurized.
• Support the mast and forks before removal so no component can move unexpectedly during the job.
• While the secondary cylinder is accessible, inspect the surrounding hydraulic hoses, fittings, and seals, and renew any worn parts at the same time.
• After installation, refill the hydraulic circuit as required, then cycle the mast slowly several times, checking for smooth travel and leaks at full extension.
• Keep hydraulic oil clean and at the correct level, as contaminated fluid is a leading cause of premature cylinder and seal failure.

Why Order from Us

At forkliftpartssearch.com, we focus on supplying the right Doosan part the first time. When you order the D512394 Lift Gp – Secondary Cylinder – FFT from us, you benefit from:

• Fitment support from a team that works with Doosan part numbers and model codes every day
• A focused catalog of Doosan forklift replacement parts, from hydraulic components to everyday wear parts
• Help before and after your order, including verification against your truck’s serial number

Need help confirming fitment? Contact our team with your truck details and we will point you to the correct part.