Southworth Products
DDL Dock Lift Manual
18
6.3 Relieving Hydraulic Pressure
If the machine is operating normally, hydraulic system pressure can be relieved by lowering the
platform to the fully lowered position or on maintenance device and continuing to hold the down
button for five to ten seconds.
If the platform is raised and will not lower:
Crush Hazard – Do not enter under the platform.
Remove load before performing any maintenance or repair.
Disconnect and lockout electrical power before performing maintenance
or repair.
Failure to securely block the platform from lowering will allow the
platform to fall uncontrolled when system pressure is relieved, causing
severe injury or death - use only supplied maintenance device.
High pressure fluid can cause severe injury or death. Always use proper
personal protective equipment when performing any maintenance or
repair.
1. Thread the lifting eyes into holes on the platform for manually raising the platform (holes off
the center line of the platform). S
ee General Installation Section numbers 1-5
.
2. Attach chains/ straps and load spreader to the lifting eyes.
3. Using an appropriate lifting device, slowly pull the chains/ straps until they are taught and
will support the platform when hydraulic pressure is relieved. If the platform is not in the
fully raised position, continue to pull the platform up until it reaches the fully raised position.
Platform weight: approximately 2000 lb.
When lifting the platform by the lifting eyes, ensure cable/chain/straps
pull vertically on the lifting eyes.
4. Ensure platform is secured and will not fall as hydraulic pressure is relieved.
5.
Carefully and slowly loosen the hydraulic fitting on the input side of the adjustable flow
control shown in the diagram to relieve system pressure. Use an appropriate, clean,
container to catch hydraulic fluid in the hoses. Use an oil absorbent to clean up any spills.
Uncontaminated fluid can be reused.
6. Engage the maintenance device. -
See Maintenance Devices section
.
7. Slowly lower the platform until resting on the maintenance device.
DOWN SOLENOID/ VALVE
PRESSURE
PUMP
MOTOR
CONTROL PANEL
TO RELIEVE SYSTEM
DISCONNECT
HYDRAULIC HOSE
FROM THIS FITTING
RESERVOIR
ADUJUSTABLE DOWN
FLOW CONTROL
