HYDRAULIC CONNECTIONS
Remove the thread protectors or dust covers from the hydraulic ports if applicable. Clean the areas around the fluid ports
of the pump and cylinder. Inspect all threads and fittings for signs of wear or damage, and replace as needed. Clean all
hose ends, couplers and union ends. Connect all hose assemblies to the pump and cylinder. Use an approved, high-
grade pipe sealant (such as Power Team HTS6) to seal all hydraulic connections. Tighten securely and leak-free but do
not overtighten.
Hydraulic lines and fittings can act as restrictors as the cylinder or ram retracts. The restricting or slowing of the fluid
flow causes back pressure that slows the cylinder's or ram's return. Return speed also varies because of the application,
condition of the cylinder or ram, inside diameter of hose or fitting, length of the hose, and the temperature and viscosity of
the hydraulic fluid.
HOSES
CORRECT
INCORRECT
BLEEDING THE SYSTEM
After all connections are made, the hydraulic system must be bled of any trapped air. Refer to the diagrams below.
With no load on the system and the pump vented and positioned higher than the cylinder or ram, cycle the system
several times. If you are in doubt about venting your pump, read the operating instructions for your pump. Check the
reservoir for possible low fluid level and fill to proper level with approved, compatible hydraulic fluid as necessary.
System with a single-acting cylinder
IMPORTANT: Some spring return cylinders or rams have a cavity in the rod which forms an air pocket. This type
of cylinder or ram should be bled when positioned upside down or lying on its side with the port facing upward.
© 2017 SPX FLOW, Inc.
SET-UP
TUBING
CORRECT
INCORRECT
System with a double-acting cylinder
6
CORRECT
INCORRECT
Form No. 102397
Rev. 7
Sept. 5, 2017