Page 41
Systems Descriptions
5 Ampere Circuit Breaker: This circuit breaker is a
single pole, manual reset, thermally-operated circuit
protection device rated at 5 amperes that protects a
circuit from being overloaded beyond the safe
current carrying capacity of the circuit. When the
breaker heats up to a certain temperature, it inter-
rupts the source of current. When the cause of the
overload is corrected and the breaker cools back
down, it may be reset to provide current.
External Electrical “Up/Fold” Solenoid: When
the platform is below floor level, pressing the UP
switch energizes this solenoid. The solenoid directs
current to the pump motor which powers the hydrau-
lic pump to raise the platform. The Up/Fold
microswitch is activated when the platform reaches
floor level. This interrupts the UP control switch
circuit which de-energizes the solenoid and removes
current to the pump motor and stops the platform.
Releasing the UP switch will also de-energize the
solenoid removing current to the pump motor and
stopping the raising function.
Pressing the FOLD switch then energizes the Up/
Fold solenoid through the fold circuit. The solenoid
in turn directs current to the pump motor to fold the
platform. Releasing the FOLD switch de-energizes
the solenoid removing current to the pump motor
and stopping the folding function.
Note: When the platform reaches the stowed (fully
folded) position, the Hydraulic Platform Sensor
Pressure Switch is activated (pre-set pressure
reached). The activated pressure switch shuts the
Pump Module
Power/Interlock Indicator Light: A green indicator
light is built into the pump module that illuminates
when remote interlock(s) are made (circuit com-
plete) and there is power to the lift. Both conditions
must be met. The light will shut off if either condition
is not met (lift functions are disabled also). An
illuminated light indicates the lift is operational.
Indicator Light
pump motor off also. See page 45 for further details.
M268 Solenoid/Hydraulic Valves: Series 07 L915
lift models are equipped with the M268 hydraulic
pump (further details in Hydraulic section). The
M268 features pump-mounted Unfold, Bridging
and Down solenoid/hydraulic valves (details follow).
When the platform is in the stowed (fully folded)
position, pressing the UNFOLD switch energizes all
three solenoid/valves. When the platform reaches
floor level, the solenoid/valves are de-energized by
the Unfold/Down microswitch circuit. Releasing the
UNFOLD switch also de-energizes the solenoid/
valves.
The Bridging and Down solenoid/hydraulic valves
are also energized while the DOWN switch is
pressed when the platform is fully unfolded. Both
solenoid/valves will remain energized until the
DOWN switch is released.
Note: The Bridging solenoid/hydraulic valve will
remain energized until the DOWN switch is released
or the Bridging microswitch is deactivated. Deacti-
vation of the Bridging microswitch stops the down
travel of the platform while allowing the roll stop to
deploy.
Troubleshooting: A problem with the solenoid/
valves can be electrical or hydraulic. Follow the
Quick-Check troubleshooting procedure when
troubleshooting (outlined on following page).
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