Custom Hoists Cylinders Parts and Service
Custom Hoists Cylinders
Custom Hoists is a diversified global manufacturing company and a leading supplier of telescopic and single stage hydraulic cylinders since 1973. Custom Hoists cylinders are designed to work in several robust applications.
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Single & Double Acting Telescopic Custom Hoists Cylinders
- Broadest product offering in the industry covering virtually any dump truck or trailer application
- New 5000 series hybrid design utilizing large North American tube sizes with a European look
- Manufacturing locations in the U.S.A. and China
- Local inventory available
Custom Hoists Cylinders
5000 Series
4000 Series
4000 Series Invert Mount
Telescopic Custom Hoists Cylinders
Single Acting Telescopic Custom Hoists Cylinders
To Extend:
High pressure oil from the pump is directed by the control valve through port (A) to fill the cylinder. Any air in the hydraulic system will be trapped in the end of the cylinder (B) and may be bled off through the bleeder valve (C). It is advisable to bleed air from the cylinder on initial start up and on a weekly basis thereafter.
As the system pressure rises, the oil pushes on the bottom of the largest plunger (F) forcing it to move out. The outside diameter or sealing area of the plunger (D) determines the effective area.
As the plunger extends, the oil trapped between the plunger wall (E) is released through internal port holes in the plunger. When the largest stage is fully extended, the next largest will proceed to extend, etc.
To Retract:
A single-acting telescopic custom hoists cylinder must be retracted by gravity or mechanical means.
Double Acting Telescopic Custom Hoists Cylinders
To Extend:
High pressure oil is directed by the control valve into extend port (A). The oil passes through an inner (transfer) tube in the smallest plunger to the base of the cylinder. The pressure acts on the effective area of the largest piston (F) and extends all stages to the first plunger stop.
The next stage then begins to extend. The effective area of each stage is figured from the inside diameter of the next largest stage. Each stage extends in its turn to the plunger stop.
Oil trapped between the plungers escapes through internal port holes (C) in each plunger and returns to tank through retract port (B).
To Retract:
High pressure oil is directed by the control valve into retract port (B). The pressure is applied to the effective area of the smallest plunger (D) which retracts first. Each stage from the smallest to the largest retracts in its turn. The effective area for retracting each stage is the area of the plunger (D).
Oil inside the custom hoists cylinder is forced out of extend port (A). Because of the area differential between the retract side and extend side the flow into retract port (B) must be multiplied by this differential to determine the flow out of port. It may be necessary to install a dump-to-tank valve to speed up the retracting cycle.