MTS Series 311 Load Frame - Manual (Page 39)

Connecting Hydraulics
Series 311 Load Frame Installation 39
Connecting Hydraulics
The procedure describes how to connect the load frame to the hydraulic power
source. The load frame can be connected directly to the hydraulic power unit
(also called HPU), to hydraulic plumbing in the workplace, or through a
hydraulic service manifold (HSM).
Note The internal hydraulic connections from the actuator manifold and
accessories such as the hydraulic lifts and locks should already be
made.
The load frame actuator usually has a manifold mounted to it. The manifold
connects the ports on each end cap to the ports for a servovalve. The hydraulic
connection are made at this manifold.
1. Connect the return line from the hydraulic power source to the hydraulic
port on the manifold labeled “R”.
2. Connect the pressure line from the hydraulic power source to the hydraulic
port on the manifold labeled “P”.
3. Connect the drain line from the hydraulic power source to the hydraulic port
on the manifold labeled “D”.
4. Turn on the HPU and check for any hydraulic pressure leaks.
5. Select low pressure for the load frame and check for hydraulic leaks in the
load frame.
6. Select high pressure for the load frame and check for hydraulic leaks in the
load frame.
7. Bleed the air out of the hydraulic lift cylinders. See “Bleeding the Hydraulic
Lift Cylinders” on page 56 .
8. Return to the installation procedure.