16
Presto Lifts
PDL Manual
4.7
Testing
Fall Risk. No personnel are to be on the platform unless the handrails
and snap cables are installed and secured.
The throw-over plates must be raised before raising or lowering the lift.
1. Verify all hydraulic and electrical connections are completed according to the schematics.
2. Verify all tools, debris, and personnel are clear of the lift.
3. Turn on the main electrical disconnect switch to power the hydraulic power unit (HPU).
4. Press and hold the up button on the operator controls. The HPU motor should start and the
lift should begin to raise.
5. Raise the lift until maintenance device(s) are not longer supporting the lift, then release the
button. The motor should turn off and the lift should come to a stop and hold its position.
6. Disengage and stow the maintenance device(s).
7. Press and hold the up button. Raise the lift to the fully raised position. Release the button
as the lift reaches the end-of-travel.
Do not continue to power the lift once the lift has reached the end-of-
travel or the lift may be damaged.
If the lift is equipped with a vertical travel limit switch, the motor should
automatically turn off as the lift reaches the fully raised position. If the
lift reaches the end-of-travel before the limit device turns off the motor,
or the motor turns off before reaching the fully raised position, see
section 6.3 Adjusting Vertical Travel Limit Devices
.
8. Press and hold the down button on the operator controls. The down valve should energize
and the lift should begin to lower. The motor should not start.
9. Lower the lift approximately one foot then release the button. The lift should come to a stop
and hold its position.
10. Lower the lift to the fully lowered position.
11. Cycle 2-3 times. The lift should raise and lower smoothly.
Some bouncing may occur during the initial cycles due to air in the
hydraulic system. Continue to cycle the lift until the problem stops. If
the issue does not stop, see section 7. Troubleshooting and/or contact
Customer Service for assistance.
12. Ensure the throw-over plate(s) move freely.