Switches; Theory Of Operation - prime mover smx45 Master Service Manual

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Switches

1. Theory of Operation

The main ON/OFF switch (S21) is provided on the truck. In
the OFF position, battery power to all control functions is
interrupted. In the ON position, battery potential is provided to
all control functions via the transistor controller.
The arm angle switches are located at the base of the
steering control handle stem. The arm angles switches (S24)
and (S25) determine brake activation and truck travel speed.
Each switch is activated by the steering control handle
position. The steering control handle must be positioned
beyond 6 degrees of the upper rest position and above 8
degrees from the bottom in order for switches to close,
permitting travel. When steering control handle is within 6
degrees of the upper rest position, parking brake is activated.
When steering control handle is between 6 to 41 degrees of
the upper rest position, arm angle B switch (S25) closes and
enables slow speed operation. When steering control handle
is placed beyond 41 degrees from the upper rest position,
arm angle A switch (S24) also closes enabling fast speed
operation. When the steering control handle is placed in the
bottom 8 degrees of the operating range, arm angle switch B
(S25) opens, activating the parking brake.
A Switch
Position
Top 6°
6° to 41°
41° plus
Bottom 8°
When forks are fully raised, lift-limit switch (S36) turns the
hydraulic pump motor off. This keeps the pump from trying to
extend the lift cylinder beyond its maximum travel. A two-
position (ON/OFF) optional key switch (S17) is located on the
main console, which energizes all truck control functions
when in the ON position, provided the main ON/OFF switch is
in the ON position.
Master Service Manual 2006-08-08
F-code
PT
Version no
001
B Switch
(S24) (S25)
Open Open
Open Closed
Closed Closed
Closed Open
Section C-code
S5.4 5310
Switches
T-code
SMX
Function
Top Brake
Slow
Fast
Bottom Brake
219