Maintenance Device - Presto Lifts Dock Lift Series Owner's Manual

6.1

Maintenance Device

The supplied maintenance device is designed to support the weight of
an UNLOADED machine only. Failure to remove the load before engaging
the maintenance device may result in failure and allow the machine to fall
unexpectedly.
If the machine is equipped with a mechanical up limit switch or proximity switch
that prevent the platform from raising high enough to engage the maintenance
device, it will need to be bypassed to engage the maintenance device.
Proximity switches can be electrically bypassed by placing a jumper wire between
the terminals the switch is connected to in the control panel. Remove the jumper
wire when maintenance is complete.
Mechanical switches will need to be bypassed by marking the location of the swing
arm and removing it from the limit switch. Replace the swing arm in the same
location when maintenance is complete.
Before performing any maintenance or repair:
1. Remove any load on the platform of the machine.
2. Verify that all personnel and debris are clear of the work area.
3. Raise the lift to the fully raised position.
4. Engage maintenance device as shown in the diagram.
When engaged, the maintenance device must rest on the underside of the
platform. Damage may occur if the maintenance device is resting on the structural
reinforcements. Maintenance device to be used on hinge end of machine only.
5. Slowly lower the machine until the weight of the machine is supported by the
maintenance device(s). Continue to hold the down button for five to ten seconds after
the platform stops to relieve hydraulic system pressure.
6. Disconnect electrical supply and lock out the machine to prevent unintended actuation
of the machine.
7. After maintenance or repair is complete, verify all tools, debris, and personnel are clear
of the area. Clean up any spills. Re-energize the machine.
8. Raise the machine to the fully raised position.
9. Disengage the maintenance device and stow the maintenance device.
10. Lower the machine to the fully lowered position.
11. Test for proper operation.
Presto Lifts 24 PDL Dock Lift Manual