MOTORS
( 4-1/2”) E-60, E-60H
The 12-volt DC high torque motor used on the
Quik- Lift
®
units are interchangeable among all three
models. Its function in all three applications is to drive
the hydraulic pump. The motor is only energized
and operating when pressurized hydraulic fluid is
required.
Two different brand motors were used. While they
are interchangeable and have nearly identical
performance characteristics, they have distinctive
design differences.
Fenner
The Fenner motor is a four pole electro magnet motor
which consists primarily of a 4-1/2” diameter solid steel
frame (coated to resist corrosion), armature, brushes,
field coils and pole pieces. This motor can be used
on vehicles with either the common negative ground
electrical system or the positive ground electrical
system.
Iskra - Single and Two terminal
The Iskra motor is a four pole, electromagnet motor
which consists primarily of a 4-1/2” diameter solid
steel frame, armature, brushes, field coils and pole
pieces. This motor can be used on vehicles with either
the common negative ground electrical system or the
positive ground electrical system.
HYDRAULIC PUMP
The pump in a hydraulic system employs an external
source of power to apply a force to a liquid. A pump
develops no power of its own. It simply transfers power
from an external source (the electric motor on the
Quik-Lift
®
unit) to the liquid in the hydraulic system.
QUIK-LIFT® UNIT COMPONENTS
RESERVOIR
ELECTRIC
MOTOR
FLO
W
OUTLET LINE
INTAKE LINE
PUMP CHAMBER
PUMP HOUSING
DRIVE GEAR
DRIVEN GEAR
FLO
W
FIGURE 1-2
-14-
The basic operating principles of the hydraulic pump
used in the Quik-Lift
®
units are quite simple. Figure
1-1 illustrates the basic components of a positive
displacement gear type pump and their functions. The
pumping action takes place within the pump chamber
which is connected to the reservoir by the intake line.
The pump chamber has an outlet line in which the
liquid under motion and pressure leaves the pump to
perform work.
PRESSURE RELIEF VALVE
A basic pressure relief valve is shown in
Figure 1-2. It consists of a poppet valve and a valve
spring. Both are located in a passage which connects
the inlet passage to the outlet passage. The poppet
valve is normally held closed by the valve spring, sealing
the connecting passage from the pressurized outlet
passage. The poppet valve, being a ball, is exposed
to the pressurized hydraulic fluid in the outlet passage.
Whenever the hydraulic pressure against the poppet
valve becomes greater than the pressure being exerted
on the poppet valve from the opposite direction by the
valve spring, the poppet valve will open. This allows
some of the pressurized hydraulic fluid to flow through
the connecting passage to the non pressurized inlet
passage. The effect is to lower the pressure in the
outlet passage which will allow the valve spring to close
the poppet valve again. Under a condition, such as
when a hydraulic cylinder is extended to the end of its
stroke, eliminating additional space for the pressurized
hydraulic oil to be pumped into, the alternate opening
and closing of the poppet valve controls the pump’s
pressure output and provides an escape for the
pressurized hydraulic fluid.
The pressure relief valve used in the Quik Lift
®
pump,
while more sophisticated than the one described,
functions in the same manner. The pump pressure
relief valve may be set by adjusting the set screw after
installing a suitable pressure gauge of 3000 P.S.I. in
the circuit.
See Specifications on page 53.
FIGURE 1-1
Reservoir
Lift Cylinder
Full Stroke
Pressure from
the Pump
SUMP BASE
E-60 with
1-1/4" Lift Ram
OPENS AT
2500 + 50 P.S.I.
E-60 with
1-3/4" Lift Ram
OPENS AT
2000 + 50 P.S.I.
