PRESTO OWNER’S MANUAL
Page 5
DBP SERIES SCISSOR LIFTS
B: INSTALLING:
Before starting, be sure that the battery is connected.
Read all of the instructions prior to starting the lift.
1. Handle Assembly
a). Portable lifts have the push handles removed for
ease of shipping. Handles should be inserted in the
holders until they bottom out then tighten set screws
on each holder with an Allen wrench.
C.
ELECTRICAL:
1. The motors on
DBP Series DC Electric Scissor
Lifts
are special intermittent duty motors with high pull
up torques. These motors require heavier duty electrical
controls than standard motors.
WARNING!
Do not attempt to modify or change the electrical
circuit. Any alterations will cause damage to the
pump and possible physical injury. Only authorized
personnel should service the electrical system.
2. For the
DBP Series DC Electric Scissor Lifts, a
battery charger is furnished with a short AC 120
plug. A circuit of 15 amps or larger will suffice to
operate the battery charger.
D.
HYDRAULICS:
1. Use only hydraulic oil for the lift. The lift has been
supplied with Conoco Super Hydraulic 32. When adding
fluid, use only the recommended oils.
2. Before using the lift, check the hydraulic oil level and
add oil if necessary. Check fittings for tightness. Remove
the solid plug on the reservoir and replace it with the
vented plug provided. If the plug is not installed, you
may damage the pump.
CAUTION!
DBP Series DC Electric Scissor Lifts are designed for
normal factory environments. Where below freez-
ing conditions may exist, special fluid must be used.
Contact Presto Lifts for further information when
freezing conditions exist.
WARNING!
Do not use automotive hydraulic, brake or transmis-
sion fluids. They may damage seals and could pose
a serious fire hazard.
E. TESTING THE LIFT WITH NO LOAD:
1. Before testing the lift, clear the area of any loose
material. Be sure the lift has no obstruction above it or
on any side.
2. Using the controls provided, briefly operate the lift
(5-10 seconds). If the lift begins to rise with a hum-
ming sound and functions properly, continue to the full
upright position.
CAUTION!
If the lift does not rise immediately, or there is any
operational problem, stop it immediately. Before
continuing, check the rotation of the pump and mo-
tor and the voltage at motor terminals; again briefly
operate the lift. If the lift does not move smoothly
with a humming sound, stop and review the proce-
dures in the section on troubleshooting (5B).
3. After raising the lift completely, lower the lift. It
should move slowly and smoothly with a humming
sound. If the lift operates properly, raise and lower the
lift and stop at different levels to get a good perspective
on the lift's operations and movements.
S E C T I O N 4
OPERATION
A. METHOD OF OPERATION:
Electric
All DBP Series DC Electric Scissor Lifts are provided
with a special relief valve and are factory preset for the
maximum
safe capacity of the lift. Activating and
holding the up switch will energize the motor. The
motor is attached to a positive displacement pump,
that draws hydraulic fluid from the reservoir and
transfers it under pressure to the cylinder. This
